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SRC4192, SRC4193
SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
SRC419x 192-kHz Stereo Asynchronous Sample-Rate Converters
1 Features
3 Description
•
The SRC4192 and SRC4193 devices are
asynchronous, sample-rate converters designed for
professional and broadcast audio applications. The
SRC4192 and SRC4193 devices combine a wide
input-to-output sampling ratio with outstanding
dynamic range and ultra-low distortion. Input and
output serial ports support standard audio formats, as
well as a Time Division Multiplexed (TDM) mode.
Flexible audio interfaces allow the SRC4192 and
SRC4193 devices to connect to a wide range of
audio data converters, digital audio receivers and
transmitters, and digital signal processors.
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Automatic Sensing of the Input-to-Output
Sampling Ratio
Wide Input-to-Output Sampling Range: 16:1 to
1:16
Supports Input and Output Sampling Rates Up to
212 kHz
Dynamic Range: 144 dB (–60-dbFS Input, BW =
20 Hz to fS/2, A-Weighted)
THD+N: –140 dB (0-dbFS Input, BW = 20 Hz to
fS/2)
Attenuates Sampling and Reference Clock Jitter
High-Performance, Linear-Phase Digital Filtering
with Stop Band Attenuation Greater than 140 dB
Flexible Audio Serial Ports:
– Master or Slave-Mode Operation
– Supports I2S, Left-Justified, Right-Justified,
and TDM Data Formats
– Supports 16, 18, 20, or 24-Bit Audio Data
– TDM Mode Allows Daisy-Chaining of up to
Eight Devices
Supports 24-, 20-, 18-, or 16-Bit Input and Output
Data: All Output Data is Dithered from the Internal
28-Bit Data Path
Low Group Delay Option for Interpolation Filter
Direct Downsampling Option for Decimation Filter
(SRC4193 Only)
SPI Port Provides Access to Internal Control
Registers (SRC4193 Only)
Soft Mute Function
Bypass Mode
Programmable Digital Output Attenuation
(SRC4193 Only); 256 Steps: 0 dB to –127.5 dB,
0.5-dB/step
Power Down Mode
Operates From a Single 3.3-V Power Supply
Small 28-Pin SSOP Package
Pin Compatible with the AD1896 (SRC4192 Only)
The SRC4192 device is a standalone, pinprogrammed device, with control pins for mode, data
format, mute, bypass, and low group-delay functions.
The SRC4193 device is a software-controlled device
featuring a serial peripheral interface (SPI) port,
which is utilized to program all functions through the
internal control registers.
The SRC4192 and SRC4193 devices can operate
from a single 3.3-V power supply. A separate digital
I/O supply (VIO) operates over the 1.65-V to 3.6-V
supply range, allowing greater flexibility when
interfacing to current and future generation signal
processors and logic devices. Both devices are
available in a 28-pin SSOP package.
Device Information(1)
PART NUMBER
SRC4192
PACKAGE
SSOP (28)
SRC4193
BODY SIZE (NOM)
5.30 mm × 10.20 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Diagram
Reference
Clock
Data
DSP
LRCK
BCK
Data
SRC4192
LRCK
BCK
DIT4192
TX+
TX±
AES,
S/PDIF
Output
2 Applications
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Digital Mixing Consoles
Digital Audio Workstations
Audio Distribution Systems
Broadcast Studio Equipment
High-End A/V Receivers
General Digital Audio Processing
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
SRC4192, SRC4193
SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
6.7
4
4
4
5
5
6
7
Absolute Maximum Ratings ......................................
ESD Ratings ............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Switching Characteristics ..........................................
Typical Characteristics ..............................................
Detailed Description ............................................ 18
7.1 Overview ................................................................. 18
7.2 Functional Block Diagram ....................................... 19
7.3 Feature Description................................................. 19
7.4 Device Functional Modes........................................ 24
7.5 Register Maps ......................................................... 25
8
Application and Implementation ........................ 28
8.1 Application Information............................................ 28
8.2 Typical Application ................................................. 31
9 Power Supply Recommendations...................... 33
10 Layout................................................................... 33
10.1 Layout Guidelines ................................................. 33
10.2 Layout Example .................................................... 35
11 Device and Documentation Support ................. 37
11.1
11.2
11.3
11.4
11.5
11.6
Documentation Support .......................................
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
37
37
37
37
37
37
12 Mechanical, Packaging, and Orderable
Information ........................................................... 37
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (September 2007) to Revision C
•
Page
Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
Changes from Revision A (July 2003) to Revision B
•
2
Page
Added U.S. patent number to note (1) U.S. Patent No. 7,262,716. ...................................................................................... 1
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Product Folder Links: SRC4192 SRC4193
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
5 Pin Configuration and Functions
SRC4192 DB Package
28-Pin SSOP
Top View
SRC4193 DB Package
28-Pin SSOP
Top View
LGRP
1
28 MODE2
RCKI
1
28 CDATA
RCKI
2
27 MODE1
NC
2
27 CCLK
NC
3
26 MODE0
NC
3
26 CS
SDIN
4
25 BCKO
SDIN
4
25 BCKO
BCKI
5
24 LRCKO
BCKI
5
24 LRCKO
LRCKI
6
23 SDOUT
LRCKI
6
VIO
7
VIO
7
DGND
8
21 DGND
DGND
8
21 DGND
BYPAS
9
20 TDMI
BYPAS
9
20 TDMI
IFMT0
10
19 OFMT0
NC
10
19 NC
IFMT1
11
18 OFMT1
NC
11
18 NC
IFMT2
12
17 OWL0
NC
12
17 NC
RST
13
16 OWL1
RST
13
16 RATIO
MUTE
14
15 RDY
MUTE
14
15 RDY
SRC4192
22 VDD
23 SDOUT
SRC4193
22 VDD
Pin Functions
PIN
NAME
SRC4192
SRC4193
I/O
DESCRIPTION
BCKI
5
5
I
Input port bit clock I/O
BCKO
25
25
O
Output port bit clock I/O
BYPAS
9
9
I
ASRC bypass control input (Active High)
CCLK
—
27
I
SPI port data clock input
CDATA
—
28
I
SPI port serial data input
CS
—
26
I
SPI port chip select input (Active Low)
DGND
8, 21
8, 21
–
Digital ground
IFMT0
10
—
I
Input port data format control input
IFMT1
11
—
I
Input port data format control input
IFMT2
12
—
I
Input port data format control input
LGRP
1
—
I
Low group delay control input (active high)
LRCKI
6
6
I
Input port left/right word clock I/O
LRCKO
24
24
O
Output port left/right word clock I/O
MODE0
26
—
I
Serial port mode control input
MODE1
27
—
I
Serial port mode control input
MODE2
28
—
I
Serial port mode control input
MUTE
14
14
I
Output mute control input (active high)
NC
3
2,3,10,11,12,
17,18,19
–
No connection
OFMT0
19
—
I
Output port data format control input
OFMT1
18
—
I
Output port data format control input
OWL0
17
—
I
Output port data word length control input
OWL1
16
—
I
Output port data word length control input
RATIO
—
16
O
Input-to-output ratio flag output
Low output denotes output rate lower than input rate.
High output denotes output rate higher than input rate.
RCKI
2
1
I
Reference Clock Input
RDY
15
15
O
ASRC Ready Status Output (Active Low)
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Product Folder Links: SRC4192 SRC4193
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Pin Functions (continued)
PIN
NAME
I/O
DESCRIPTION
SRC4192
SRC4193
RST
13
13
I
Reset Input (Active Low)
SDIN
4
4
I
Audio Serial Data Input
SDOUT
23
23
O
Audio Serial Data Output
TDMI
20
20
I
TDM Data Input (Connect to DGND when not in use)
VDD
22
22
I
Digital Core Supply, 3.3 V
VIO
7
7
I
Digital I/O Supply, 1.65 V to VDD
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
Supply Voltage
(1)
MIN
MAX
VDD
–0.3
4
VIO
–0.3
4
UNIT
V
Digital Input Voltage
–0.3
4
Operating Temperature
–45
85
°C
Storage temperature, Tstg
–65
150
°C
(1)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±3000
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
±1500
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
NOM
MAX
3
3.3
3.6
VIO 1.8 V
1.65
1.8
1.95
VIO 3.3 V
3
3.3
3.6
VDD
Supply voltage
Operating temperature
4
Submit Documentation Feedback
–45
85
UNIT
V
°C
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Product Folder Links: SRC4192 SRC4193
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
6.4 Thermal Information
THERMAL METRIC
SRC4192
SRC4193
(1)
UNIT
DB (SSOP)
28 PINS
RθJA
Junction-to-ambient thermal resistance
78.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
38.1
°C/W
RθJB
Junction-to-board thermal resistance
39.3
°C/W
ψJT
Junction-to-top characterization parameter
7.1
°C/W
ψJB
Junction-to-board characterization parameter
38.9
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
N/A
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
6.5 Electrical Characteristics
All parameters specified with TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
212
kHz
212
kHz
DYNAMIC PERFORMANCE (1)
Resolution
fSIN
Input sampling frequency
fSOUT
Output sampling frequency
24
4
4
Upsampling
Bits
1:16
Input: output sampling ratio
Downsampling
16:1
44.1 kHz; 48 kHz
140
48 kHz; 44.1 kHz
140
48 kHz; 96 kHz
140
44.1 kHz; 192 kHz
96 kHz; 48 kHz
Dynamic range
192 kHz; 12 kHz
138
BW = 20 Hz to fSOUT/2, –60-dBFS Input
fIN = 1 kHz, Unweighted (add 3 dB to spec for Aweighted result)
141
dB
141
192 kHz; 32 kHz
141
192 kHz; 48 kHz
141
32 kHz; 48 kHz
140
12 kHz; 192 kHz
138
44.1 kHz; 48 kHz
–140
48 kHz; 44.1 kHz
–140
48 kHz; 96 kHz
–140
44.1 kHz; 192 kHz
Total harmonic distortion +
noise
96 kHz; 48 kHz
192 kHz; 12 kHz
–137
–140
BW = 20 Hz to fSOUT/2, 0-dBFS Input fIN = 1 kHz,
Unweighted
dB
–140
192 kHz; 32 kHz
–141
192 kHz; 48 kHz
–141
32 kHz; 48 kHz
–140
12 kHz; 192 kHz
–137
Interchannel gain mismatch
0
dB
Interchannel phase deviation
0
°
Minimum
Digital attenuation
Maximum
0
SRC4193 Only
–127.5
Step Size
Mute attenuation
dB
0.5
24-Bit Word Length, A-weighted
–144
dB
DIGITAL INTERPOLATION FILTER CHARACTERISTICS
Passband
Passband ripple
Hz
±0.007
dB
0.5465 × fSIN
Hz
Transition band
0.4535 × fSIN
Stop band
0.5465 × fSIN
Hz
–144
dB
Stop band attenuation
(1)
0.4535 × fSIN
Dynamic performance measured with an Audio Precision System Two Cascade or Cascade Plus.
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Electrical Characteristics (continued)
All parameters specified with TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
Decimation Filter On (DFLT = 0)
102.53125/fSIN
Decimation Filter Off (DFLT = 1)
102/fSIN
Decimation Filter On (DFLT = 0)
70.53125/fSIN
Decimation Filter Off (DFLT = 1)
70/fSIN
Normal group delay (LGRP = 0)
Low group delay (LGRP = 1)
MAX
UNIT
s
s
DIGITAL DECIMATION FILTER CHARACTERISTICS
Passband
Passband ripple
Transition band
0.4535 × fSOUT
Stop band
0.5465 × fSOUT
Stop band attenuation
0.4535 × fSOUT
Hz
±0.008
dB
0.5465 × fSOUT
Hz
Hz
–143
Group delay – decimation filter
DFLT = 0 for SRC4193
Direct downsampling
SRC4193 only, DFLT = 1
dB
36.46875/fSOUT
s
0
s
DIGITAL I/O CHARACTERISTICS
VIH
High-level input voltage
0.7 × VIO
VIO
VIL
Low-level input voltage
0
0.3 × VIO
V
IIH
High-level input current
10
µA
IIL
Low-level input current
10
µA
VOH
High-level output voltage
IO = –4 mA
0.8 × VIO
VIO
V
VOL
Low-level output voltage
IO = +4 mA
0
0.2 × VIO
CIN
Input Capacitance
0.5
0.5
3
V
V
pF
POWER SUPPLIES
Operating voltage, VDD
3
3.3
3.6
Operating voltage, VIO
1.65
3.3
3.6
V
VDD = 3.3 V, VIO = 3.3 V, RST = 0, No Clocks
Supply current, IDD, power down
SRC4193 only, VDD = 3.3 V, VIO = 3.3 V,
PDN Bit = 0, No Clocks
Supply current, IDD, dynamic
VDD = 3.3 V, VIO = 3.3 V, fSIN = fSOUT = 192 kHz
100
5
Supply current, IIO, power down
SRC4193 only, VDD = 3.3 V, VIO = 3.3 V,
PDN Bit = 0, No Clocks
Supply current, IIO, dynamic
VDD = 3.3 V, VIO = 3.3 V, fSIN = fSOUT = 192 kHz
mA
66
VDD = 3.3 V, VIO = 3.3 V, RST = 0, No Clocks
µA
mA
100
µA
21
2
VDD = 3.3 V, VIO = 3.3 V, RST = 0, No Clocks
mA
660
µW
Total power dissipation, PD, power down
SRC4193 only, VDD = 3.3 V, VIO = 3.3 V,
PDN Bit = 0, No Clocks
16.6
mW
Total power dissipation, PD, dynamic
VDD = 3.3 V, VIO = 3.3 V, fSIN = fSOUT = 192 kHz
225
mW
6.6 Switching Characteristics
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
128 ×
fSMIN
50
MHz
20
1/(128
×fSMIN)
REFERENCE CLOCK TIMING
RCKI frequency
fSMIN = min (fSIN, fSOUT),
fSMAX = max (fSIN, fSOUT)
tRCKIP
RCKI period
ns
tRCKIH
RCKI pulsewidth high
0.4 ×
tRCKIP
ns
tRCKIL
RCKI pulsewidth low
0.4 ×
tRCKIP
ns
500
ns
500
µs
RESET TIMING
tRSTL
RST pulse width low
Delay following RST rising edge
SRC4193 only
INPUT SERIAL PORT TIMING
tLRIS
LRCKI to BCKI setup time
10
ns
tSIH
BCKI pulsewidth high
10
ns
6
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
Switching Characteristics (continued)
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tSIL
BCKI pulsewidth low
10
ns
tLDIS
SDIN data setup time
10
ns
tLDIH
SDIN data hold time
10
ns
OUTPUT SERIAL PORT TIMING
tDOPD
SDOUT data delay time
tDOH
SDOUT data hold time
2
10
ns
ns
tSOH
BCKO pulsewidth high
10
ns
tSOL
BCKO pulsewidth low
5
ns
TDM MODE TIMING
tLROS
LRCKO setup time
10
ns
tLROH
LRCKO hold time
10
ns
tTDMS
TDMI data setup time
10
ns
tTDMH
TDMI data hold time
10
ns
SPI TIMING
CCLK frequency
25
MHz
tCDS
CDATA setup time
12
ns
tCDH
CDATA hold time
8
ns
tCSCR
CS falling to CCLK rising
15
ns
tCFCS
CCLK falling to CS rising
12
ns
6.7 Typical Characteristics
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
20k
40k
60k
80k
96k
0
Frequency (Hz)
20k
40k
60k
80k
96k
Frequency (Hz)
12 kHz:192 kHz
12 kHz:192 kHz
Figure 1. FFT With 1-kHz Input Tone at 0 dBFS
Figure 2. FFT With 1-kHz Input Tone at –60 dBFS
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Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
5k
10k
15k
20k
24k
0
5k
Frequency (Hz)
10k
15k
20k
24k
Frequency (Hz)
32 kHz:48 kHz
32 kHz:48 kHz
Figure 3. FFT With 1-kHz Input Tone at 0 dBFS
Figure 4. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
5k
10k
15k
20k
24k
0
5k
Frequency (Hz)
10k
15k
20k
24k
Frequency (Hz)
44.1 kHz:48 kHz
44.1 kHz:48 kHz
Figure 5. FFT With 1-kHz Input Tone at 0 dBFS
Figure 6. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
10k
20k
30k
40k
48k
0
10k
Frequency (Hz)
44.1 kHz:96 kHz
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30k
40k
48k
44.1 kHz:96 kHz
Figure 7. FFT With 1-kHz Input Tone at 0 dBFS
8
20k
Frequency (Hz)
Figure 8. FFT With 1-kHz Input Tone at –60 dBFS
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Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
20k
40k
60k
80k
96k
0
20k
Frequency (Hz)
40k
60k
80k
96k
Frequency (Hz)
44.1 kHz:192 kHz
44.1 kHz:192 kHz
Figure 9. FFT With 1-kHz Input Tone at 0 dBFS
Figure 10. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–70
–20
–80
–40
–90
–100
dBFS
dBFS
–60
–80
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
5k
10k
15k
20k 22k
0
5k
Frequency (Hz)
10k
15k
20k 22k
Frequency (Hz)
48 kHz:44.1 kHz
48 kHz:44.1 kHz
Figure 11. FFT With 1-kHz Input Tone at 0 dBFS
Figure 12. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
10k
20k
30k
40k
48k
0
Frequency (Hz)
10k
20k
30k
40k
48k
Frequency (Hz)
48 kHz:96 kHz
48 kHz:96 kHz
Figure 13. FFT With 1-kHz Input Tone at 0 dBFS
Figure 14. FFT With 1-kHz Input Tone at –60 dBFS
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
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Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
20k
40k
60k
80k
96k
0
20k
Frequency (Hz)
40k
60k
80k
96k
Frequency (Hz)
48 kHz:192 kHz
48 kHz:192 kHz
Figure 15. FFT With 1-kHz Input Tone at 0 dBFS
Figure 16. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–20
–70
–80
–40
–90
–100
dBFS
dBFS
–60
–80
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
5k
10k
15k
20k 22k
0
5k
Frequency (Hz)
10k
15k
20k 22k
Frequency (Hz)
96 kHz:44.1 kHz
96 kHz:44.1 kHz
Figure 17. FFT With 1-kHz Input Tone at 0 dBFS
Figure 18. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
5k
10k
15k
20k
24k
0
5k
Frequency (Hz)
96 kHz:48 kHz
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15k
20k
24k
96 kHz:48 kHz
Figure 19. FFT With 1-kHz Input Tone at 0 dBFS
10
10k
Frequency (Hz)
Figure 20. FFT With 1-kHz Input Tone at –60 dBFS
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
20k
40k
60k
80k
96k
0
20k
40k
Frequency (Hz)
60k
80k
96k
Frequency (Hz)
96 kHz:192 kHz
96 kHz:192 kHz
Figure 21. FFT With 1-kHz Input Tone at 0 dBFS
Figure 22. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–70
–20
–80
–40
–90
–100
dBFS
dBFS
–60
–80
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
1k
2k
3k
4k
5k
6k
0
1k
2k
Frequency (Hz)
3k
4k
5k
6k
Frequency (Hz)
192 kHz:12 kHz
192 kHz:12 kHz
Figure 23. FFT With 1-kHz Input Tone at 0 dBFS
Figure 24. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–70
–20
–80
–40
–90
–100
dBFS
dBFS
–60
–80
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
2.5
5k
7.5k
10k
12.5k
15k 16k
0
2.5k
Frequency (Hz)
5k
7.5k
10k
12.5k
15k 16k
Frequency (Hz)
192 kHz:32 kHz
192 kHz:32 kHz
Figure 25. FFT With 1-kHz Input Tone at 0 dBFS
Figure 26. FFT With 1-kHz Input Tone at –60 dBFS
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Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
–60
0
–70
–20
–80
–40
–90
–100
dBFS
dBFS
–60
–80
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
5k
10k
15k
0
20k 22k
5k
10k
15k
20k 22k
Frequency (Hz)
Frequency (Hz)
192 kHz:44.1 kHz
192 kHz:44.1 kHz
Figure 27. FFT With 1-kHz Input Tone at 0 dBFS
Figure 28. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
5k
10k
15k
20k
24k
0
10k
Frequency (Hz)
20k
30k
40k
24k
Frequency (Hz)
192 kHz:48 kHz
192 kHz:48 kHz
Figure 29. FFT With 1-kHz Input Tone at 0 dBFS
Figure 30. FFT With 1-kHz Input Tone at –60 dBFS
0
–60
–20
–70
–80
–40
–90
–100
–80
dBFS
dBFS
–60
–100
–110
–120
–130
–120
–140
–140
–150
–160
–160
–170
–180
–180
0
10k
20k
30k
40k
48k
0
10k
Frequency (Hz)
192 kHz:96 kHz
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30k
40k
48k
192 kHz:96 kHz
Figure 31. FFT With 1-kHz Input Tone at 0 dBFS
12
20k
Frequency (Hz)
Figure 32. FFT With 1-kHz Input Tone at –60 dBFS
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
Typical Characteristics (continued)
0
0
–20
–20
–40
–40
–60
–60
–80
dBFS
dBFS
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
–100
–80
–100
–120
–120
–140
–140
–160
–160
–180
–180
0
5k
10k
15k
20k
24k
0
5k
Frequency (Hz)
44.1 kHz:48 kHz
20k 22k
Figure 34. FFT With 20-kHz Input Tone at 0 dBFS
0
0
–20
–20
–40
–40
–60
–60
–80
dBFS
dBFS
15k
48 kHz:44.1 kHz
Figure 33. FFT With 20-kHz Input Tone at 0 dBFS
–100
–80
–100
–120
–120
–140
–140
–160
–160
–180
–180
0
5k
10k
15k
20k
24k
0
10k
Frequency (Hz)
20k
30k
40k
48k
Frequency (Hz)
48 kHz:48 kHz
48 kHz:96 kHz
Figure 35. FFT With 20-kHz Input Tone at 0 dBFS
Figure 36. FFT With 20-kHz Input Tone at 0 dBFS
0
0
–20
–20
–40
–40
–60
–60
–80
–80
dBFS
dBFS
10k
Frequency (Hz)
–100
–100
–120
–120
–140
–140
–160
–160
–180
–180
0
5k
10k
15k
20k
24k
0
Frequency (Hz)
20k
40k
60k
80k
96k
Frequency (Hz)
96 kHz:48 kHz
192 kHz:192 kHz
Figure 37. FFT With 20-kHz Input Tone at 0 dBFS
Figure 38. FFT With 80-kHz Input Tone at 0 dBFS
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Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
–120
Total Harmonic Distortion+Noise (dB)
Total Harmonic Distortion+Noise (dB)
–120
–125
–130
–135
–140
–145
–150
–155
–160
–140
–120
–100
–80
–60
–40
–20
–125
–130
–135
–140
–145
–150
–155
–160
–140
0
–120
44.1 kHz:48 kHz
Figure 39. THD+N vs Input Amplitude fIN = 1 kHz
–40
–20
0
Figure 40. THD+N vs Input Amplitude fIN = 1 kHz
Total Harmonic Distortion+Noise (dB)
Total Harmonic Distortion+Noise (dB)
–60
–120
–125
–130
–135
–140
–145
–150
–155
–160
–140
–120
–100
–80
–60
–40
–20
–125
–130
–135
–140
–145
–150
–155
–160
–140
0
–120
Input Amplitude (dBFS)
–100
–80
–60
–40
–20
0
Input Amplitude (dBFS)
48 kHz:96 kHz
96 kHz:48 kHz
Figure 41. THD+N vs Input Amplitude fIN = 1 kHz
Figure 42. THD+N vs Input Amplitude fIN = 1 kHz
–120
–120
Total Harmonic Distortion+Noise (dB)
Total Harmonic Distortion+Noise (dB)
–80
48 kHz:44.1 kHz
–120
–125
–130
–135
–140
–145
–150
–155
–160
–140
–120
–100
–80
–60
–40
–20
0
–125
–130
–135
–140
–145
–150
–155
–160
–140
–120
Input Amplitude (dBFS)
44.1 kHz:192 kHz
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–100
–80
–60
–40
–20
0
Input Amplitude (dBFS)
192 kHz:48 kHz
Figure 43. THD+N vs Input Amplitude fIN = 1 kHz
14
–100
Input Amplitude (dBFS)
Input Amplitude (dBFS)
Figure 44. THD+N vs Input Amplitude fIN = 1 kHz
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
–120
Total Harmonic Distortion+Noise (dB)
Total Harmonic Distortion+Noise (dB)
–120
–125
–130
–135
–140
–145
–150
–155
–160
–125
–130
–135
–140
–145
–150
–155
–160
0
5k
10k
15k
20k
0
5k
Input Frequency (Hz)
44.1 kHz:48 kHz
Figure 45. THD+N vs Input Frequency, 0-dBFS Input
20k
Figure 46. THD+N vs Input Frequency, 0-dBFS Input
–120
Total Harmonic Distortion+Noise (dB)
Total Harmonic Distortion+Noise (dB)
15k
48 kHz:44.1 kHz
–120
–125
–130
–135
–140
–145
–150
–155
–160
–125
–130
–135
–140
–145
–150
–155
–160
0
5k
10k
15k
20k
0
5k
Input Frequency (Hz)
10k
15k
20k
Input Frequency (Hz)
48 kHz:96 kHz
96 kHz:48 kHz
Figure 47. THD+N vs Input Frequency, 0-dBFS Input
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
Figure 48. THD+N vs Input Frequency, 0-dBFS Input
Output Amplitude (dBFS)
Output Amplitude (dBFS)
10k
Input Frequency (Hz)
– 140– 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 – 20 – 10
0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
– 140– 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 – 20 – 10
44.1 kHz:48 kHz
0
Input Amplitude (dBFS)
Input Amplitude (dBFS)
48 kHz:44.1 kHz
Figure 49. Linearity With fIN = 200 Hz
Figure 50. Linearity With fIN = 200 Hz
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Typical Characteristics (continued)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
Output Amplitude (dBFS)
Output Amplitude (dBFS)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
– 140– 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 – 20 – 10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
– 140–130–120– 110 –100 –90 –80 – 70 –60 –50 –40 –30 – 20 –10
0
48 kHz:48 kHz
48 kHz:96 kHz
Figure 52. Linearity With fIN = 200 Hz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
Output Amplitude (dBFS)
Output Amplitude (dBFS)
Figure 51. Linearity With fIN = 200 Hz
– 140– 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 – 20 – 10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
0
– 140– 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 – 20 – 10
Input Amplitude (dBFS)
0
Input Amplitude (dBFS)
96 kHz:48 kHz
44.1 kHz:192 kHz
Figure 53. Linearity With fIN = 200 Hz
Figure 54. Linearity With fIN = 200 Hz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
dBFS
Output Amplitude (dBFS)
0
Input Amplitude (dBFS)
Input Amplitude (dBFS)
– 140– 130 – 120 – 110 – 100 – 90 – 80 – 70 – 60 – 50 – 40 – 30 – 20 – 10
0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
192kHz:32kHz
192kHz:48kHz
192kHz:96kHz
0
10k
Input Amplitude (dBFS)
20k
30k
40k
50k
60k
Frequency (Hz)
192 kHz:44.1 kHz
Figure 55. Linearity With fIN = 200 Hz
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Figure 56. Frequency Response With 0-dBFS Input
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Typical Characteristics (continued)
At TA = 25°C, VDD = 3.3 V, and VIO = 3.3 V, unless otherwise noted.
0
0
–0.004
–0.009
–0.01
–0.019
(dBFS)
dBFS
–0.014
–0.024
–0.029
–0.02
–0.03
–0.034
–0.039
–0.04
–0.044
–0.049
–0.05
0
2k
4k
6k
8k
10k 12k 14k 16k 18k 20k 22k
0
5k
10k
15k
20k 22k
Input Amplitude (dBFS)
Frequency (Hz)
48k:48k
192k:48k
Figure 57. Pass Band Ripple
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Figure 58. Pass Band Ripple
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7 Detailed Description
7.1 Overview
The SRC4192 and SRC4193 devices are asynchronous, sample-rate converters (ASRC) designed for
professional audio applications. Operation at input and output sampling frequencies up to 212 kHz is supported,
with an input and output sampling ratio range of 16:1 to 1:16. Excellent dynamic range and Total Harmonic
Distortion + Noise (THD+N) are achieved by employing high-performance, linear-phase digital filtering with image
rejection better than 140 dB. Digital filtering options allow for lower group-delay processing. These include a low
group-delay option for the interpolation and resampler function, as well as a direct down-sampling option for the
decimation function (SRC4193 device only).
The audio input and output ports support standard audio data formats, as well as a TDM interface mode. Word
lengths of 24-, 20-, 18-, and 16-bits are supported. Both ports may operate in slave mode, deriving their word
and bit clocks from external input and output devices. Alternatively, one port may operate in master mode while
the other remains in slave mode. In master mode, the LRCK and BCK clocks are derived from the reference
clock input, RCKI. The flexible configuration of the input and output ports allows connection to a wide variety of
audio data converters, interface devices, digital signal processors, and programmable logic.
A bypass mode is included, which allows audio data to be passed directly from the input port to the output port,
bypassing the ASRC function. The bypass option is useful for passing through encoded or compressed audio
data, or nonaudio control or status data.
A soft mute function is available on both the SRC4192 and SRC4193 devices. Digital output attenuation is
available only for the SRC4193 device. Both soft mute and digital attenuation functions provide artifact-free
operation, while allowing muting or level adjustment of the audio output signal. The mute attenuation is typically
–144 dB, while the digital attenuation control is adjustable from 0 dB to –127.5 dB in 0.5-dB steps.
The SRC4193 device includes a three-wire SPI port to access on-chip control registers for configuration of
internal functions. The port can be easily interfaced to microprocessors or digital signal processors with
synchronous serial port peripherals.
Functional Block Diagram shows a functional block diagram of the SRC4192 and SRC4193 devices. Audio data
is received at the input port, clocked by either the audio data source in slave mode, or by the SRC419x in master
mode. The output-port data is clocked by either the audio data source in slave mode, or by the SRC419x in
master mode. The input data is passed through interpolation filters which up-sample the data, which is then
passed on to the resampler. The rate estimator compares the input and output sampling frequencies by
comparing LRCKI, LRCKO, and a reference clock. The results include an offset for the FIFO pointer and the
coefficients needed for re-sampling function.
The output of the resampler is passed on to either the decimation filter or direct down-sampler function. The
decimation filter performs down-sampling and anti-alias filtering functions, and is required when the output
sampling frequency is lower than the input-sampling frequency. The direct down-sampler function does not
provide any filtering, and may be used in cases when aliasing is not an issue. This includes the case when the
output sampling frequency is equal to or greater than the input sampling frequency. The advantage of direct
down-sampling is a significant reduction in the group delay associated with the decimation filter, allowing lower
latency sample rate conversion. The direct down-sampler function is available only for the SRC4193 device.
18
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
7.2 Functional Block Diagram
LRCKI
BCKI
SDIN
Audio
Input
Port
fSIN
Interpolation
Filters
16fSIN
Re-Sampler
16fSOUT
MODE [2:0]
IFMT [2:0
REFCLK
OFMT [1:0]
OWL [1:0]
MUTE
LRCKI
Control
Logic
(SRC4192)
Rate
Estimator
BYPAS
LGRP
RST
LRCKO
RDY
RATIO (SRC4193 only)
MUTE
BYPASS
RST
CS
SPI and
Control Logic
(SRC4193)
fSOUT
Decimation
Filters
fSOUT
Direct
Down-Sampler
(SRC4193 only)
CCLK
CDATA
LRCKO
BCKO
SDOUT
Audio
Output
Port
Mux
TDMI
VDD
DGND
RCKI
Reference
Clock
Power
REFCLK
VIO
DGND
7.3 Feature Description
7.3.1 Input Port Operation
The audio input port is a three-wire synchronous serial interface that can operate in either slave or master mode.
The SDIN input (pin 4) is the serial audio data input. Audio data is input at this pin in one of three standard audio
data formats: Philips I2S, Left-Justified, or Right-Justified. The audio data word length may be up to 24-bits for
I2S and Left-Justified formats, while the Right-Justified format supports 16-, 18-, 20-, or 24-bit data. The data
formats are shown in Figure 59, while critical timing parameters are shown in Figure 60 and listed in Electrical
Characteristics.
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Feature Description (continued)
Right Channel
Left Channel
LRCKO
BCKI
SDIN
MSB
LSB
MSB
LSB
(a) Left Justified Data Format
LRCKI
BCKI
MSB
SDIN
LSB
MSB
LSB
(b) Right Justified Data Format
LRCKI
BCKI
MSB
SDIN
LSB
MSB
LSB
(c) I2S Data Format
1/fS
Figure 59. Input Data Formats
LRCKI
tLRIS
tSIH
BCKI
tLDIS
tSIL
SDIN
tLDIH
Figure 60. Input Port Timing
The bit clock is either an input or output at BCKI (pin 5). In slave mode, BCKI is configured as an input pin, and
may operate at rates from 32fS to 128fS,with a minimum of one clock cycle per data bit. In master mode, BCKI
operates at a fixed rate of 64fS.
The left/right word clock, LRCKI (pin 6), may be configured as an input or output pin. In slave mode, LRCKI is an
input pin, while in master mode LRCKI is an output pin. In either case, the clock rate is equal to fS, the input
sampling frequency. The LRCKI duty cycle is fixed to 50% for master mode operation.
Table 1 shows data format selection for the input port. For the SRC4192, the IFMT0 (pin 10), IFMT1 (pin 11),
and IFMT2 (pin 12) inputs are used to set the input port data format. For the SRC4193, the IFMT[2:0] bits in
Control Register 3 are used to select the data format.
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Feature Description (continued)
Table 1. Input Port Data Format Selection
IFMT2
IFMT1
IFMT0
INPUT PORT DATA FORMAT
0
0
0
24-Bit Left Justified
0
0
1
24-Bit I2S
0
1
0
Unused
0
1
1
Unused
1
0
0
16-Bit Right Justified
1
0
1
18-Bit Right Justified
1
1
0
20-Bit Right Justified
1
1
1
24-Bit Right Justified
7.3.2 Output Port Operation
The audio output port is a four-wire synchronous serial interface that can operate in either Slave or Master mode.
The SDOUT output (pin 23) is the serial audio data output. Audio data is output at this pin in one of four data
formats: Philips I2S, Left-Justified, Right-Justified, or TDM. The audio data word length may be 16-, 18-, 20-, or
24-bits. For all word lengths, the data is triangular PDF dithered from the internal 28-bit data path. The data
formats (with the exception of TDM mode) are shown in Figure 61, while critical timing parameters are shown in
Figure 62 and listed in Electrical Characteristics. The TDM format and timing are shown in Figure 72 and
Figure 73, respectively, while examples of standard TDM configurations are shown in Figure 74 and Figure 75
Right Channel
Left Channel
LRCKO
BCKO
SDOUT
MSB
LSB
MSB
LSB
(a) Left Justified Data Format
LRCKO
BCKO
MSB
SDOUT
LSB
MSB
LSB
(b) Right Justified Data Format
LRCKO
BCKO
SDOUT
MSB
LSB
MSB
LSB
(c) I2S Data Format
1/fS
Figure 61. Output Data Formats
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LRCKO
tSOH
BCKO
tSOL
tDOPD
SDOUT
tDOH
Figure 62. Output Port Timing
The bit clock is either input or output at BCKO (pin 25). In Slave mode, BCKO is configured as an input pin, and
can operate at rates from 32fS to 128fS, with a minimum of one clock cycle for each data bit. The exception is the
TDM mode, where the BCKO must operate at N × 64fS, where N is equal to the number of SRC4192 or
SRC4193 devices included on the TDM interface. In master mode, BCKO operates at a fixed rate of 64fS for all
data formats except TDM, where BCKO operates at the reference clock (RCKI) frequency. Additional information
regarding TDM mode operation is included in Application and Implementation.
The left/right word clock, LRCKO (pin 24), can be configured as an input or output pin. In slave mode, LRCKO is
an input pin, while in master mode it is an output pin. In either case, the clock rate is equal to fS, the output
sampling frequency. The clock duty cycle is fixed to 50% for I2S, Left-Justified, and Right-Justified formats in
master mode. The LRCKO pulse width is fixed to 32 BCKO cycles for the TDM format in master mode.
Table 2 illustrates data format selection for the output port. For the SRC4192, the OFMT0 (pin 19), OFMT1 (pin
18), OWL0 (pin 17), and OWL1 (pin 16) inputs are used to set the output port data format and word length. For
the SRC4193, the OFMT[1:0] and OWL[1:0] bits in Control Register 3 are used to select the data format and
word length.
Table 2. Output Port Data Format Selection
OFMT1
OFMT0
OUTPUT PORT DATA FORMAT
0
0
Left-Justified
0
1
I2S
1
0
TDM
1
1
Right-Justified
OWL1
OWL0
OUTPUT PORT DATA WORD LENGTH
0
0
24-Bits
0
1
20-Bits
1
0
18-Bits
1
1
16-Bits
7.3.3 Soft Mute Function
The soft mute function of the SRC419x device is invoked by forcing the MUTE input (pin 14) high. For the
SRC4193 device, the mute function may also be accessed using the MUTE bit in Control Register 1. The soft
mute function slowly attenuates the output signal level down to all zeroes plus ±1LSB of dither. This provides an
artifact-free muting of the audio output port.
7.3.4 Digital Attenuation (SRC4193 Only)
The SRC4193 device includes independent digital attenuation for the left and right audio channels. The
attenuation ranges from 0 dB (or unity) to –127.5 dB in 0.5-dB steps. The attenuation settings are programmed
using Control Registers 4 and 5, corresponding to the left and right channels, respectively.
The TRACK bit in Control Register 1 selects independent or tracking attenuation modes. When TRACK = 0, the
left and right channels are controlled independently. When TRACK = 1, the attenuation setting for the left
channel is also used for the right channel, and the right channel is said to track the left channel attenuation
setting.
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7.3.5 Ready Output
The SRC419x device includes an active low ready output named RDY (pin 15). This is an output from the rate
estimator block, which indicates that the input-to-output sampling frequency ratio has been determined. The
ready signal can be used as a flag or indicator output. The ready signal can also be connected to the active high
MUTE input (pin 14) to provide an auto-mute function, so that the output port is muted when the rate estimator is
in transition.
7.3.6 Ratio Output (SRC4193 Only)
The SRC4193 device includes a simple ratio flag output named RATIO (pin 16). When RATIO is low, it indicates
that the output sampling frequency is lower than the input sampling frequency. When RATIO is high, it indicates
that the output sampling frequency is higher than the input sampling frequency. The ratio output can be used as
an indicator or flag output for an LED or host device.
7.3.7 Serial Peripheral Interface (SPI) Port: SRC4193 Only
The SPI port is a three-wire synchronous serial interface used to access the on-chip control registers of the
SRC4193 device. The interface is comprised of a serial data clock input, CCLK (pin 27), a serial data input,
CDATA (pin 28), and an active low chip-select input, CS (pin 26). Figure 63 shows the protocol for writing control
registers using the serial control port. Figure 64 shows the critical timing parameters for the SPI port interface,
which are also listed in Electrical Characteristics.
Set CS = 1 here to write one register or buffer location.
Keep CS = 0 to enable auto-increment mode.
CS
Header
Byte 0
CDIN
Register or Buffer Data
Byte 2
Byte 3
Byte 1
Byte N
CCLK
BYTE DEFINITION
MSB
BYTE 0:
0
LSB
0
0
0
0
A2
A1
A0
Register Address
Set to 0.
Set to 0.
Byte 1: All 8 bits are Don’t Care. Set to 0 or 1.
Bytes 2 through N: Register Data.
All Bytes are written MSB first.
Figure 63. SPI Port Protocol
tCFCS
CS
tCSCR
tCDS
CCLK
tCDH
CDATA
Figure 64. SPI Port Timing
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Byte 0 indicates the address of the control register to be written. The two most significant bits are set to 0, while
the six least significant bits contain the control register address. Byte 1 is a don’t care byte. This byte is included
in the protocol to maintain compatibility with current and future Texas Instruments digital audio products,
including the DIT4096 and DIT4192 digital audio transmitters. Byte 2 contains the 8-bit data for the control
register addressed in Byte 0.
As shown in Figure 63, a write sequence starts by bringing the CS input low. Bytes 0, 1, and 2 are then written to
program a single control register. Bringing the CS input high after the third byte will write just one register.
However, if CS remains low after writing the first control byte, the port will autoincrement the address by 1,
allowing successive addresses to be written. The address is automatically incremented by 1 after each byte is
written, as long as the CS input remains low. This is referred to as auto-increment operation, and is always
enabled for the SPI port.
7.4 Device Functional Modes
7.4.1 Reset and Power Down Operation
The SRC419x device can be reset using the RST input (pin 13). There is no internal power-on reset, so the user
should force a reset sequence after power up to initialize the device. To force a reset, the reference clock input
must be active, with an external clock source supplying a valid reference clock signal (refer to Figure 80). The
user must assert RST low for a minimum of 500 ns, and then bring RST high again to force a reset. Figure 65
shows the reset timing for the SRC419x device.
For the SRC4193, there is an additional 500 µs delay after the RST rising edge, due to internal logic
requirements. The customer should wait at least 500 µs after the RST rising edge before attempting to write to
the SPI port of the SRC4193 device.
The SRC419x device also supports a power-down mode. Power-down mode may be set by either holding the
RST input low (SRC4192 and SRC4193 devices), or by setting the PDN bit in Control Register 1 to zero
(SRC4193 device only). The SRC4193 device will be in power-down mode by default after an external reset has
been issued. To enable normal operation for the SRC4193, disable power down mode by writing a 1 to the PDN
bit in Control Register 1.
When using the PDN bit in Control Register 1 to enable power-down mode for the SRC4193, the current state of
the control registers is maintained through the power-down and power-up transition.
RCKI
RST
tRSTL > 500ns
Figure 65. Reset Pulse Width Requirement
7.4.2 Audio Port Modes
The SRC4192 and SRC4193 devices both support seven serial-port modes, shown in Table 3. For the SRC4192
device, the audio port mode is selected using the MODE0 (pin 26), MODE1 (pin 27), and MODE2 (pin 28) inputs.
For the SRC4193 device, the mode is selected using the MODE[2:0] bits in Control Register 1. The default mode
setting for the SRC4193 device is both input and output ports set to slave mode.
In slave mode, the port LRCK and BCK clocks are configured as inputs, and receive their clocks from an external
audio device. In master mode, the LRCK and BCK clocks are configured as outputs, being derived from the
reference clock input (RCKI). Only one port can be set to master mode at any given time, as indicated in Table 3.
Table 3. Setting the Serial Port Modes
24
MODE2
MODE1
MODE0
SERIAL PORT MODE
0
0
0
Both Input and Output Ports are Slave mode
0
0
1
Output Port is Master mode with RCKI = 128 fS
0
1
0
Output Port is Master mode with RCKI = 512 fS
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Device Functional Modes (continued)
Table 3. Setting the Serial Port Modes (continued)
MODE2
MODE1
MODE0
SERIAL PORT MODE
0
1
1
Output Port is Master mode with RCKI = 256 fS
1
0
0
Both Input and Output Ports are Slave mode
1
0
1
Input Port is Master mode with RCKI = 128 fS
1
1
0
Input Port is Master mode with RCKI = 512 fS
1
1
1
Input Port is Master mode with RCKI = 256 fS
7.4.3 Bypass Mode
The SRC419x device includes a bypass function, which routes the input port data directly to the output port
bypassing the ASRC function. Bypass mode may be invoked by forcing the BYPAS input (pin 9) high for the
devices. The bypass mode may also be accessed for the SRC4193 device using the BYPAS bit in Control
Register 1. The BYPAS pin and control bit should be set to 0 for normal operation.
No dithering is applied to the output data in bypass mode, and the digital attenuation and mute functions are also
unavailable.
7.5 Register Maps
7.5.1 Control Register Map (SRC4193 Device Only)
The control register map for the SRC4193 device is shown in Table 4. Register 0 is reserved for factory use and
defaults to all zeros upon reset. Avoid writing this register, as unexpected operation may result if Register 0 is
programmed to an arbitrary value. Registers 1 through 5 contain control bits used to configure the internal
functions of the SRC4193. All other register addresses are reserved and should not be used in customer
applications.
Table 4. SRC4193 Device Control Register Map
Register
Address
(Dec/Hex)
D7 (MSB)
D6
D5
D4
D3
D2
D1
D0 (LSB)
0
0
0
0
0
0
0
0
0
1
PDN
TRACK
0
MUTE
BYPAS
MODE2
MODE1
MODE0
2
0
0
0
0
0
0
DFLT
LGRP
3
OWL1
OWL0
OFMT1
OFMT0
0
IFMT2
IFMT1
IFMT0
4
AL7
AL6
AL5
AL4
AL3
AL2
AL1
AL0
5
AR7
AR6
AR5
AR4
AR3
AR2
AR1
AR0
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7.5.1.1 System Control Register
Table 5. System Control Register Field Descriptions
Bit
Field
Description
7
PDN
Power Down
Setting this bit to 0 sets the SRC4193 to the power-down state. All other
register settings are preserved and the SPI port remains active. (Default)
Setting this bit to 1 powers up the SRC4193 using the current register
settings.
6
TRACK
Digital Attenuation Tracking
0 = Tracking Off: Attenuation for the Left and Right channels is controlled
independently. (Default)
1 = Tracking On: Left channel attenuation setting is used for both channels.
5
Reserved
4
MUTE
Output Soft Mute
This bit is logically OR’d with the MUTE input (pin 14)
0 = Soft mute disabled (Default)
1 = Soft mute enabled with data attenuated to all 0s
3
BYPAS
Bypass Mode
This bit is logically OR’d with the BYPAS input (pin 9)
0 = Bypass Mode disabled with normal ASRC operation. (Default)
1 = Bypass Mode enabled with data routed directly from the input port to the
output port, bypassing the ARSC function.
2-0
MODEx
Audio Serial Port Mode
See Table 3.
7.5.1.2 Filter Control Register
Figure 66. Filter Control Register
7
6
5
4
3
2
Reserved
1
DFLT
0
LGRP
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 6. Filter Control Register Field Descriptions
Bit
Field
7-2
Reserved
1
DFLT
Description
Decimation Filtering / Direct Down-Sampling
The DFLT bit enables or disables the direct down-sampling function.
0 = Decimation filter enabled (default) (Must be used when fSOUT is less than
fSIN)
1 = Direct down-sampling enabled without filtering. (May be enabled when
fSOUT is equal to or greater than fSIN)
0
LGRP
Low Group Delay
This bit selects the number of input audio samples to be stored in the data
buffer before the ASRC starts processing the audio data.
0 = Normal delay, 64 samples (default)
1 = Low delay, 32 samples
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7.5.1.3 Audio Data Format Register
Figure 67. Audio Data Format Register
7
OWL1
6
OWL0
5
OFMT1
4
OFMT0
3
Reserved
2
IFMT2
1
IFMT1
0
IFMT0
1
AL1
0
AL0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 7. Audio Data Format Register Field Descriptions
Bit
Field
Description
7-6
OWLx
Output Port Data Word Length
5-4
OFMTx
See Table 2.
Output Port Data Format
See Table 2.
3
2-0
Reserved
IFMTx
Input Port Data Format
See Table 1.
7.5.1.4 Digital Attenuation Register – Left Channel
Figure 68. Digital Attenuation Register – Left Channel
7
AL7
6
AL6
5
AL5
4
AL4
3
AL3
2
AL2
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8. Digital Attenuation Register – Left Channel Field Descriptions
Bit
Field
Description
7-0
ALx
Register defaults to 00HEX, or 0 dB (unity gain).
Output Attenuation (dB) = (–N × 0.5), where N = AL[7:0]DEC
7.5.1.5 Digital Attenuation Register – Right Channel
Figure 69. Digital Attenuation Register – Right Channel
7
6
5
4
3
2
1
0
AR7
AR6
AR5
AR4
AR3
AR2
AR1
AR0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 9. Digital Attenuation Register – Right Channel Field Descriptions
Bit
Field
Description
7-0
ARx
Register defaults to 00HEX, or 0 dB (unity gain).
Output Attenuation (dB) = (–N × 0.5), where N = AR[7:0]DEC
When the TRACK bit in Control Register 1 is set to 1, the Left Channel attenuation setting will be used
for the Right Channel attenuation.
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
This section of the data sheet provides practical applications information for hardware and systems engineers
designing the SRC4192 and SRC4193 devices into the end equipment.
8.1.1 Interfacing to Digital Audio Receivers and Transmitters
The input and output ports of the SRC4192 and SRC4193 devices are designed to interface to a variety of audio
devices, including receivers and transmitters commonly used for AES/EBU, S/PDIF, and CP1201
communications.
Texas Instruments manufactures the DIR1703 digital audio interface receiver and DIT4096/4192 digital audio
transmitters to address these applications.
Figure 70 shows interfacing the DIR1703 device to the input port of the SRC4192 or SRC4193 device. The
DIR1703 device operates from a single 3.3-V supply, which requires the VIO supply (pin 7) for the SRC4192 or
SRC4193 device to be set to 3.3 V for interface compatibility.
SRC4192, SRC4193
DIR1703
LRCKO
AES3, S/PDIF
Input
RCV
DIN
LRCKI
BCKO
BCKI
DATA
SDIN
SCKO
RCLI
Clock
Generator
Clock
Select
Assumes VIO = +3.3V for SRC4192, SRC4293
Figure 70. Interfacing the SRC4193 to the DIR1703 Digital Audio Interface Receiver
Figure 71 shows the interface between the output port of the SRC4192 or SRC4193 device and the audio serial
port of the DIT4096 or DIT4192 device. Again, the VIO supplies for both the SRC419x device and DIT4096/4192
device are set to 3.3 V for compatibility.
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Application Information (continued)
DIT4096, DIT4192
SRC4192, SRC4193
LRCKO
SYNC
TX+
BCKO
SCLK
TX–
AES3, S/PDIF
OUTPUT
SDATA
SDOUT
RCKI
MCLK
REF Clock
Generator
DIT Clock
Generator
Clock
Select
Assumes VIO = +3.3V for SRC4192, SRC4293 and DIT4096, DIT4192
Figure 71. Interfacing the SRC4193 to the DIT4096/4192 Digital Audio Interface Transmitter
Like the output port of the SRC4192 or SRC4193 device, the audio serial port of the DIT4096 and DIT4192
device can be configured as a master or slave. In cases where the output port of the SRC419x device is set to
master mode, use the reference clock source (RCKI) as the master clock source (MCLK) for the DIT4096/4192
device, to ensure that the transmitter is synchronized to the output port data of the SRC419x device.
8.1.2 TDM Applications
The SRC4192 and SRC4193 devices support a TDM output mode, which allows multiple devices to be daisychained together to create a serial frame. Each device occupies one subframe within a frame, and each subframe carries two channels (Left followed by Right). Each sub-frame is 64 bits long, with 32 bits allotted for each
channel. The audio data for each channel is left justified within the allotted 32 bits. Figure 72 shows the TDM
frame format, while Figure 73 shows TDM input timing parameters, which are listed in Electrical Characteristics.
LRCKO
BCKO
SDOUT
Left
Right
Left
Sub-Frame 1
Right
Sub-Frame 2
Left
Right
Sub-Frame N
One Frame = 1/fs
N = Number of Daisy-Chained Devices
One Sub-Frame contains 64 bits, with 32 bits per channel.
For each channel, the audio data is left justified, MSB first format, with the word length determined by the OWL[1:0] pins/bits.
Figure 72. TDM Frame Format
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Application Information (continued)
tLROS
LRCKO
tLROH
BCKO
tTDMS
TDMI
tTDMH
Figure 73. Input Timing for TDM Mode
The frame rate is equal to the output sampling frequency, fs. The BCKO frequency for the TDM interface is N ×
64fs, where N is the number of devices included in the daisy chain. For Master mode, the output BCKO
frequency is fixed to the reference clock (RCKI) input frequency. The number of devices that can be daisychained in TDM mode is dependent upon the output sampling frequency and the BCKO frequency, leading to the
following numerical relationship:
Number of Daisy-Chained Devices = (fBCKO / fs) / 64
where
•
•
fBCKO = Output Port Bit Clock (BCKO), 27.648-MHz maximum
fs = Output Port Sampling (or LRCKO) Frequency, 216-kHz maximum.
(1)
This relationship holds true for both slave and master modes.
Figure 74 and Figure 75 show typical connection schemes for TDM mode. Although the TMS320C671x DSP
device family is shown as the audio processing engine in these figures, other TI digital signal processors with a
multi-channel buffered serial port (McBSPTM) may also function with this arrangement. Interfacing to processors
from other manufacturers is also possible. Refer to Figure 62 in this data sheet, along with the equivalent serial
port timing diagrams shown in the DSP data sheet, to determine compatibility.
SRC4192, SRC4193
Slave #N
SRC4192, SRC4193
Slave #2
SRC4192, SRC4193
Slave #1
TDMI
TDMI
TDMI
SDOUT
SDOUT
TMS320C671x
McBSP
SDOUT
DRn
FSRn
LRCKO
LRCKO
LRCKO
BCKO
BCKO
BCKO
RCKI
RCKI
RCKI
n = 0 or 1
CLKRn
CLKIN or CLKSn
Clock
Generator
Figure 74. TDM Interface where all Devices are Slaves
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Application Information (continued)
SRC4192, SRC4193
Master
SRC4192, SRC4193
Slave #2
SRC4192, SRC4193
Slave #1
TDMI
TDMI
TDMI
TMS320C671x
McBSP
SDOUT
DRn
LRCKO
LRCKO
LRCKO
FSRn
BCKO
BCKO
BCKO
RCKI
RCKI
RCKI
SDOUT
SDOUT
n = 0 or 1
CLKRn
CLKIN or CLKSn
Clock
Generator
Figure 75. TDM Interface where one Device is Master to Multiple Slaves
8.2 Typical Application
Figure 76 and Figure 77 show typical connection diagrams for the SRC4192 and SRC4193 devices
(respectively). Recommended values for power supply bypass capacitors are included. These capacitors should
be placed as close to the IC package as possible.
From
Control
Logic
SRC4192
1
2
3
Reference
Clock
4
5
6
7
8
9
10
11
12
13
14
Audio Input
Device
From/To
Control
Logic
LGRP
RCKI
NC
MODE2
MODE1
MODE0
SDIN
BCKI
LRCKI
VIO
DGND
BYPAS
IFMT0
IFMT1
IFMT2
RST
MUTE
BCKO
LRCKO
SDOUT
VDD
DGND
TDMI
OFMT0
OFMT1
OWL0
OWL1
RDY
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VIO = +1.65V to VDD
10µF
Audio Output
Device
VDD = +3.3V
To Pin 7
To Pin 22
To Pin 8
To Pin 21
0.1µF
0.1µF
10µF
Figure 76. Typical Connection Diagram for the SRC4192
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Typical Application (continued)
Host
(MCU, DSP)
SRC4193
1
2
3
Reference
Clock
4
5
6
7
8
9
10
11
12
13
14
Audio Input
Device
To/From
Host
or
Control
Logic
RCKI
NC
NC
CDATA
CCLK
CS
SDIN
BCKI
LRCKI
VIO
DGND
BYPAS
NC
NC
NC
RST
MUTE
BCKO
LRCKO
SDOUT
VDD
DGND
TDMI
NC
NC
NC
RATIO
RDY
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VDD = +3.3V
VIO = +1.65V to VDD
To Pin 7
10µF
Audio Output
Device
To Pin 22
0.1µF
0.1µF
To Pin 8
10µF
To Pin 21
Figure 77. Typical Connection Diagram for the SRC4193
8.2.1 Design Requirements
The following lists design requirements:
•
•
•
•
Control: Hardware, I2C, or SPI
Audio input: PCM serial data
Audio output: PCM serial data
Reference clock
8.2.2 Detailed Design Procedure
8.2.2.1 Control Method
The SRC4192 is a hardware controlled device while the SRC4193 is a software controlled device. The SRC4192
control pins can be connected to VDD or GND directly or by the GPIO of a host controller. The SRC4193 can
communicate over a 3 wire SPI.
8.2.2.2 Audio Input and Output
The Audio input and output ports can handle 16, 18, 20, or 24 bit right justified PCM serial data as well as 24 bit
I2S or left justified PCM serial data at up to a 212-kHz sampling rate. A TDM format is also available. Both input
and output can operate in slave mode, or one can operate as master while the other operates as a slave. A 16:1
or 1:16 is the max ratio supported between the input and output audio sampling rates.
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Typical Application (continued)
0
0
–20
–20
–40
–40
–60
–60
–80
dBFS
dBFS
8.2.3 Application Curves
–100
–80
–100
–120
–120
–140
–140
–160
–160
–180
–180
0
5k
10k
15k
20k
24k
0
10k
Frequency (Hz)
20k
30k
40k
48k
Frequency (Hz)
44.1 kHz:48 kHz
44.1 kHz:96 kHz
Figure 78. FFT With 1-kHz Input Tone at 0 dBFS
Figure 79. FFT With 1-kHz Input Tone at 0 dBFS
9 Power Supply Recommendations
To ensure compatibility, the VDD_IO and VDD_CORE supplies of the AD1896 device must be set to 3.3 V, while
the VIO and VDD supplies of the SRC4192 device must be set to 3.3 V.
10 Layout
10.1 Layout Guidelines
10.1.1 Reference Clock
The SRC4192 and SRC4193 devices require a reference clock for operation. The reference clock is applied at
the RCKI input (pin 1 for the SRC4193 device, pin 2 for the SRC4192 device). Figure 80 shows the reference
clock connections and requirements for the SRC4192 and SRC4193 devices. The reference clock may operate
at 128fS, 256fS, or 512fS, where fS are the input or output sampling frequency. The maximum external reference
clock input frequency is 50 MHz.
SRC4192
SRC4193
RCKI
RCKI
2
1
From External
Clock Source
50MHz max
From External
Clock Source
50MHz max
tRCKIP
RCKI
tRCKIH
tRCKIL
tRCKIP > 20ns min
tRCKIH > 0.4 tRCKIP
tRCKIL > 0.4 tRCKIP
Figure 80. Reference Clock Input Connections and Timing Requirements
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Layout Guidelines (continued)
10.1.2 Pin Compatibility With the Analog Devices AD1896 (SRC4192 Only)
The SRC4192 device is pin-and function-compatible with the AD1896 device when observing the guidelines
indicated in the following paragraphs.
10.1.2.1 Crystal Oscillator
The SRC4192 does not have an on-chip crystal oscillator. An external reference clock is required at the RCKI
input (pin 2).
10.1.2.2 Reference Clock Frequency
The reference clock input frequency for the SRC4192 must be no higher than 30 MHz, to match the master clock
frequency specification of the AD1896 device. In addition, the SRC4192 device does not support the 768fS
reference clock rate.
10.1.2.3 Master Mode Maximum Sampling Frequency
When the input or output ports are set to master mode, the maximum sampling frequency must be limited to 96
kHz to support the AD1896 device specification. This is despite the fact that the SRC4192 device supports a
maximum sampling frequency of 212 kHz in master mode. The user should consider building an option into their
design to support the higher sampling frequency of the SRC4192 device.
10.1.2.4 Matched Phase Mode
Because of the internal architecture of the SRC4192 device, it does not require or support the matched phase
mode of the AD1896 device. Given multiple SRC4192 devices, if all reference clock (RCKI) inputs are driven
from the same clock source, the devices will be phase-matched.
34
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10.2 Layout Example
1
Reference Clock
Audio Input
Device
1.65 V to VDD
LGRP
MODE2
28
Control Logic
2
RCKI
MODE1
27
3
NC
MODE0
26
4
SDIN
BCKO
25
5
BCKI
LRCKO
24
6
LRCKI
SDOUT
23
7
VIO
VDD
8
22
8
DGND
DGND
21
9
BYPAS
TDMI
20
10
IFMT0
OFMT0
19
11
IFMT1
OFMT1
18
12
IFMT2
OWL0
17
13
RST
OWL1
16
14
MUTE
RDY
15
SRC4192
3.3 V
+
+
10 F
Audio Output
Device
0.1 F
0.1 F
10 F
Control Logic
(1)
Control Logic
Top layer ground pour(1)
Via to bottom ground plane
Top layer signal traces
Pad to top layer ground pour
TI recommends placing a top-layer ground pour for shielding around the SRC4192 device and connecting it to the
lower main PCB-ground plane with multiple vias.
Figure 81. SRC4192 Layout Example
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Layout Example (continued)
Reference Clock
Audio Input
Device
1
RCKI
2
CDATA
28
NC
CCLK
27
3
NC
CS
26
4
SDIN
BCKO
25
5
BCKI
LRCKO
24
6
LRCKI
SDOUT
23
VDD
8
22
7
1.65 V to VDD
VIO
SRC4193
Host SPI
Communication
3.3 V
+
+
10 F
Host or Control
Logic
(1)
Audio Output
Device
0.1 F
8
DGND
9
DGND
21
NC
TDMI
20
10
NC
NC
19
11
NC
NC
18
12
NC
NC
17
13
RST
RATIO
16
14
MUTE
RDY
15
0.1 F
10 F
Host or Control
Logic
Top layer ground pour(1)
Via to bottom ground plane
Top layer signal traces
Pad to top layer ground pour
TI recommends placing a top-layer ground pour for shielding around the SRC4193 device and connecting it to the
lower main PCB-ground plane with multiple vias.
Figure 82. SRC4193 Layout Example
36
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SBFS022C – JUNE 2003 – REVISED OCTOBER 2015
11 Device and Documentation Support
11.1 Documentation Support
11.1.1 Related Documentation
For related documentation, see the following: SRC4192EVM Evaluation Module, SBAU088
11.2 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 10. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
SRC4192
Click here
Click here
Click here
Click here
Click here
SRC4193
Click here
Click here
Click here
Click here
Click here
11.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SRC4192IDB
ACTIVE
SSOP
DB
28
50
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
SRC4192I
SRC4192IDBR
ACTIVE
SSOP
DB
28
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
SRC4192I
SRC4192IDBRG4
ACTIVE
SSOP
DB
28
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
SRC4192I
SRC4193IDB
ACTIVE
SSOP
DB
28
50
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
SRC4193I
SRC4193IDBR
ACTIVE
SSOP
DB
28
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
SRC4193I
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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