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DS90CR216A, DS90CR286A, DS90CR286A-Q1
SNLS043H – MAY 2000 – REVISED JANUARY 2016
DS90CR286A/-Q1 (or DS90CR216A) 3.3-V Rising Edge Data Strobe LVDS Receiver
28-Bit (or 21-Bit) Channel Link-66 MHz
1 Features
3 Description
•
•
•
•
The DS90CR286A receiver converts the four LVDS
data streams back into parallel 28 bits of LVCMOS
data. Also available is the DS90CR216A receiver that
converts the three LVDS data streams back into
parallel 21 bits of LVCMOS data. The outputs of both
receivers strobe on the rising edge.
1
•
•
•
•
•
•
•
20 to 66 MHz Shift Clock Support
50% Duty Cycle on Receiver Output Clock
Best–in–Class Set and Hold Times on Rx Outputs
Rx Power Consumption < 270 mW (Typ) at 66
MHz Worst Case
Rx Power-Down Mode < 200 μW (Max)
ESD Rating > 7 kV (HBM), > 700 V (EIAJ)
PLL Requires No External Components
Compatible with TIA/EIA-644 LVDS Standard
Low Profile 56-Pin or 48-Pin DGG (TSSOP)
Package
Operating Temperature: −40°C to 85°C
Automotive Q Grade Available - AEC-Q100 Grade
3 Qualified
The receiver LVDS clock operates at rates from 20 to
66 MHz. The device phase-locks to the input clock,
samples the serial bit streams at the LVDS data lines,
and converts them into parallel output data. At an
incoming clock rate of 66 MHz, each LVDS input line
is running at a bit rate of 462 Mbps, resulting in a
maximum throughput of 1.848 Gbps for the
DS90CR286A and 1.386 Gbps for the DS90CR216A.
The DS90CR286A and DS90CR216A devices are
enhanced over prior generation receivers and provide
a wider data valid time on the receiver output. The
use of these serial link devices is ideal for solving
EMI and cable size problems associated with
transmitting data over wide, high speed parallel
LVCMOS interfaces. Both devices are offered in
TSSOP packages.
2 Applications
•
•
•
•
•
Video Displays
Automotive Infotainment
Industrial Printers and Imaging
Digital Video Transport
Machine Vision
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DS90CR286AMTD
TSSOP (56)
14.00 mm x 6.10 mm
DS90CR286AQMT
TSSOP (56)
14.00 mm x 6.10 mm
DS90CR216AMTD
TSSOP (48)
12.50 mm × 6.10 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Block Diagram (DS90CR216A)
LVDS Cable or PCB Trace
DS90CR216A 21-Bit Rx
18-Bit RGB Display Unit
RxOUT[20:0]
3 x LVDS-to- 21-Bit LVCMOS
21-Bit Tx Data
(3 LVDS Data, 1 LVDS Clock)
100 Q
Graphics Processor Unit (GPU)
100 Q
100 Q
LVDS Data
100 Q
LVDS Clock
RxCLK
PLL
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.
DS90CR216A, DS90CR286A, DS90CR286A-Q1
SNLS043H – MAY 2000 – REVISED JANUARY 2016
www.ti.com
Table of Contents
1
2
3
4
5
6
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
6.1
6.2
6.3
6.4
6.5
6.6
6.7
7
1
1
1
2
3
5
Absolute Maximum Ratings ...................................... 5
ESD Ratings.............................................................. 5
Recommended Operating Conditions....................... 5
Thermal Information .................................................. 5
Electrical Characteristics........................................... 6
Switching Characteristics: Receiver ......................... 7
Typical Characteristics ............................................ 13
Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagrams ..................................... 14
7.3 Feature Description................................................. 15
7.4 Device Functional Modes........................................ 16
8
Application and Implementation ........................ 17
8.1 Application Information............................................ 17
8.2 Typical Applications ............................................... 17
9 Power Supply Recommendations...................... 23
10 Layout................................................................... 23
10.1 Layout Guidelines ................................................. 23
10.2 Layout Examples................................................... 23
11 Device and Documentation Support ................. 25
11.1
11.2
11.3
11.4
11.5
11.6
Device Support......................................................
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
25
25
25
25
25
25
12 Mechanical, Packaging, and Orderable
Information ........................................................... 25
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision G (August 2015) to Revision H
Page
•
Changed Figure 6 and Figure 7 to clarify that TxIN on Tx is the same as RxOUT on Rx .................................................... 9
•
Changed "limit output amplitude" to "reduce reflections from long board traces" for clarification........................................ 18
•
Deleted 0.01-µF and 0.001-µF caps from required DC power supply coupling capacitors ................................................. 18
•
Deleted "Setup and Hold Time" label from the Rx strobe window diagram to clarify RSKM concept ................................. 21
•
Changed direction of Rx strobe position shift for correct left and right RSKM margin shift behavior .................................. 21
•
Added new Application Note reference for RSKM improvement.......................................................................................... 21
•
Added improved layout guidelines........................................................................................................................................ 23
•
Changed Figure 28 graphic to clarify the use of series resistors on LVCMOS output ........................................................ 24
Changes from Revision F (February 2013) to Revision G
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
•
Changed specification title to clarify 3.3 V LVCMOS and not standard 5 V CMOS............................................................... 6
•
Changed title and graphic of figure to clarify 3.3 V LVCMOS and not standard 5 V CMOS ................................................. 8
•
Changed title of DS90CR286A mapping to clarify the make-up of the LVDS lines ............................................................... 9
•
Changed title of DS90CR216A mapping to clarify the make-up of the LVDS lines ............................................................... 9
•
Added cycle-to-cycle jitter value of 250 ps instead of TBD ps ............................................................................................. 12
Changes from Revision E (February 2013) to Revision F
•
2
Page
Changed layout of National Data Sheet to TI format ............................................................................................................. 3
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SNLS043H – MAY 2000 – REVISED JANUARY 2016
5 Pin Configuration and Functions
DGG Package
56-Pin TSSOP
DS90CR286A Top View
DGG Package
48-Pin TSSOP
DS90CR216A Top View
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3
DS90CR216A, DS90CR286A, DS90CR286A-Q1
SNLS043H – MAY 2000 – REVISED JANUARY 2016
www.ti.com
DS90CR286A Pin Functions — DGG0056A Package — 28-Bit Channel Link Receiver
PIN
I/O , TYPE
PIN DESCRIPTION
10, 9,
12, 11,
16, 15,
20, 19
I, LVDS
Positive and negative LVDS differential data inputs. 100-Ω termination resistors
should be placed between RxIN+ and RxIN- receiver inputs as close as
possible to the receiver pins for proper signaling.
RxCLKIN+,
RxCLKIN-
18,
17
I, LVDS
Positive and negative LVDS differentiaI clock input. 100-Ω termination resistor
should be placed between RxCLKIN+ and RxCLKIN- receiver inputs as close
as possible to the receiver pins for proper signaling.
RxOUT[27:0]
7, 6, 5, 3,
2, 1, 55, 54,
53, 51, 50, 49,
47, 46, 45, 43,
42, 41, 39, 38,
37, 35, 34, 33,
32, 30, 29, 27
O, LVCMOS
LVCMOS level data outputs.
RxCLK OUT
26
O, LVCMOS
LVCMOS Ievel clock output. The rising edge acts as the data strobe.
PWR DWN
25
I, LVCMOS
LVCMOS level input. When asserted low, the receiver outputs are low.
VCC
56, 48, 40, 31
Power
Power supply pins for LVCMOS outputs.
GND
52, 44, 36,
28, 4
Power
Ground pins for LVCMOS outputs.
PLL VCC
23
Power
Power supply for PLL.
PLL GND
24, 22
Power
Ground pin for PLL.
LVDS VCC
13
Power
Power supply pin for LVDS inputs.
LVDS GND
21, 14, 8
Power
Ground pins for LVDS inputs.
NAME
RxIN0+,
RxIN1+,
RxIN2+,
RxIN3+,
NO.
RxIN0-,
RxIN1-,
RxIN2-,
RxIN3-
DS90CR216A Pin Functions — DGG0048A Package — 21-Bit Channel Link Receiver
PIN
NAME
NO.
I/O , TYPE
PIN DESCRIPTION
RxIN0+, RxIN0-,
RxIN1+, RxIN1-,
RxIN2+, RxIN2-
9, 8,
11, 10,
15, 14
I, LVDS
Positive and negative LVDS differential data inputs. 100-Ω termination resistors
should be placed between RxIN+ and RxIN- receiver inputs as close as
possible to the receiver pins for proper signaling.
RxCLKIN+,
RxCLKIN-
17,
16
I, LVDS
Positive and negative LVDS differentiaI clock input. 100-Ω termination resistor
should be placed between RxCLKIN+ and RxCLKIN- receiver inputs as close
as possible to the receiver pins for proper signaling.
RxOUT[20:0]
5, 4, 2, 1, 47,
46, 45, 43, 41,
40, 39, 37, 35,
34, 33, 31, 30,
29, 27, 26, 24
O, LVCMOS
LVCMOS level data outputs.
RxCLK OUT
23
O, LVCMOS
LVCMOS Ievel clock output. The rising edge acts as the data strobe.
PWR DWN
22
I, LVCMOS
LVCMOS level input. When asserted low, the receiver outputs are low.
VCC
48, 42, 36, 28
Power
Power supply pins for LVCMOS outputs.
GND
44, 38, 32,
25, 3
Power
Ground pins for LVCMOS outputs.
PLL VCC
20
Power
Power supply for PLL.
PLL GND
21, 19
Power
Ground pin for PLL.
LVDS VCC
12
Power
Power supply pin for LVDS inputs.
LVDS GND
18, 13, 7
Power
Ground pins for LVDS inputs.
4
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SNLS043H – MAY 2000 – REVISED JANUARY 2016
6 Specifications
6.1 Absolute Maximum Ratings
see
(1) (2)
MIN
MAX
UNIT
Supply voltage (VCC)
–0.3
4
V
LVCMOS output voltage
–0.3
(VCC + 0.3 V)
V
LVDS receiver input voltage
–0.3
(VCC + 0.3 V)
V
150
°C
260
°C
150
°C
Junction temperature
Lead temperature (soldering, 4 sec)
Storage temperature, Tstg
(1)
(2)
–65
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.
If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±7000
Charged device model (CDM), per JEDEC specification JESD22C101 (2)
±700
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
MIN
NOM
MAX
Supply voltage (VCC)
3.0
3.3
3.6
V
Operating free air temperature (TA)
–40
25
85
°C
Receiver input range
0
Supply noise voltage (VNOISE)
UNIT
2.4
V
100
mVPP
6.4 Thermal Information
THERMAL METRIC
(1)
DS90CR286A/-Q1
DS90CR216A
DGG (TSSOP)
DGG (TSSOP)
56 PINS
48 PINS
UNIT
RθJA
Junction-to-ambient thermal resistance
64.6
67.8
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
20.6
22.1
°C/W
RθJB
Junction-to-board thermal resistance
33.3
34.8
°C/W
ψJT
Junction-to-top characterization parameter
1.0
1.1
°C/W
ψJB
Junction-to-board characterization parameter
33.0
34.5
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
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SNLS043H – MAY 2000 – REVISED JANUARY 2016
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6.5 Electrical Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified. (1) (2)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
LVCMOS DC SPECIFICATIONS (For PWR DWN Pin)
VIH
High Level Input Voltage
2
VCC
V
VIL
Low Level Input Voltage
GND
0.8
V
VCL
Input Clamp Voltage
–0.79
–1.5
V
IIN
Input Current
1.8
10
μA
ICL = −18 mA
V IN = 0.4 V, 2.5 V or VCC
V IN = GND
–10
2.7
μA
0
LVCMOS DC SPECIFICATIONS
VOH
High Level Output Voltage
IOH = −0.4 mA
VOL
Low Level Output Voltage
IOL = 2 mA
0.06
0.3
IOS
Output Short Circuit Current
VOUT = 0 V
–60
–120
mA
100
mV
3.3
V
V
LVDS RECEIVER DC SPECIFICATIONS
VTH
Differential Input High Threshold
VTL
Differential Input Low Threshold
IIN
Input Current
VCM = +1.2V
–100
mV
VIN = +2.4V, VCC = 3.6V
±10
μA
VIN = 0V, VCC = 3.6V
±10
μA
65
mA
RECEIVER SUPPLY CURRENT
ICCRW
ICCRW
ICCRW
CL = 8 pF, Worst Case
Pattern, DS90CR286A
(Figure 1 Figure 2),
TA=−10°C to +70°C
f = 33 MHz
49
f = 37.5 MHz
53
70
mA
f = 66 MHz
81
105
mA
f = 40 MHz
53
70
mA
Receiver Supply Current Worst Case
CL = 8 pF, Worst Case
Pattern, DS90CR286A
(Figure 1 Figure 2),
TA=−40°C to +85°C
f = 66 MHz
81
105
mA
f = 33 MHz
49
55
mA
Receiver Supply Current Worst Case
CL = 8 pF, Worst Case
Pattern, DS90CR216A
(Figure 1 Figure 2),
TA=−10°C to +70°C
f = 37.5 MHz
53
60
mA
f = 66 MHz
78
90
mA
f = 40 MHz
53
60
mA
f = 66 MHz
78
90
mA
10
55
μA
Receiver Supply Current Worst Case
ICCRW
Receiver Supply Current Worst Case
CL = 8 pF, Worst Case
Pattern, DS90CR216A
(Figure 1 Figure 2),
TA=−40°C to +85°C
ICCRZ
Receiver Supply Current Power Down
Power Down = Low Receiver Outputs Stay
Low during Power Down Mode
(1)
(2)
6
Typical values are given for VCC = 3.3 V and TA = 25ºC.
Current into device pins is defined as positive. Current out of device pins is defined as negative. Voltages are referenced to ground
unless otherwise specified (except VOD and ΔV OD).
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SNLS043H – MAY 2000 – REVISED JANUARY 2016
6.6 Switching Characteristics: Receiver
over operating free-air temperature range (unless otherwise noted) (1)
PARAMETER
MIN
TYP
MAX
UNIT
CLHT
LVCMOS Low-to-High Transition Time (Figure 2)
2
5
ns
CHLT
LVCMOS High-to-Low Transition Time (Figure 2)
1.8
5
ns
RSPos0
Receiver Input Strobe Position for Bit 0 (Figure 9, Figure 10)
1
1.4
2.15
ns
RSPos1
Receiver Input Strobe Position for Bit 1
4.5
5
5.8
ns
RSPos2
Receiver Input Strobe Position for Bit 2
RSPos3
Receiver Input Strobe Position for Bit 3
RSPos4
8.1
8.5
9.15
ns
11.6
11.9
12.6
ns
Receiver Input Strobe Position for Bit 4
15.1
15.6
16.3
ns
RSPos5
Receiver Input Strobe Position for Bit 5
18.8
19.2
19.9
ns
RSPos6
Receiver Input Strobe Position for Bit 6
22.5
22.9
23.6
ns
RSPos0
Receiver Input Strobe Position for Bit 0
(Figure 9, Figure 10)
0.7
1.1
1.4
ns
RSPos1
Receiver Input Strobe Position for Bit 1
2.9
3.3
3.6
ns
RSPos2
Receiver Input Strobe Position for Bit 2
5.1
5.5
5.8
ns
RSPos3
Receiver Input Strobe Position for Bit 3
7.3
7.7
8
ns
RSPos4
Receiver Input Strobe Position for Bit 4
9.5
9.9
10.2
ns
RSPos5
Receiver Input Strobe Position for Bit 5
11.7
12.1
12.4
ns
RSPos6
Receiver Input Strobe Position for Bit 6
13.9
14.3
14.6
ns
RSKM
RxIN Skew Margin (2) (Figure 11)
RCOP
RxCLK OUT Period (Figure 3)
15
T
RCOH
RxCLK OUT High Time (Figure 3)
10
12.2
ns
RCOL
RxCLK OUT Low Time (Figure 3)
RSRC
RxOUT Setup to RxCLK OUT (Figure 3)
RHRC
f = 40 MHz
f = 66 MHz
f = 40 MHz
490
f = 66 MHz
400
ps
ps
50
ns
10
11
ns
6.5
11.6
ns
RxOUT Hold to RxCLK OUT (Figure 3)
6
11.6
ns
RCOH
RxCLK OUT High Time (Figure 3)
5
7.6
ns
RCOL
RxCLK OUT Low Time (Figure 3)
5
6.3
ns
RSRC
RxOUT Setup to RxCLK OUT (Figure 3)
4.5
7.3
ns
RHRC
RxOUT Hold to RxCLK OUT (Figure 3)
4
6.3
RCCD
RxCLK IN to RxCLK OUT Delay at 25°C, VCC = 3.3 V (3) (Figure 4)
3.5
5
RPLLS
Receiver Phase Lock Loop Set (Figure 5)
RPDD
Receiver Power Down Delay (Figure 8)
(1)
(2)
(3)
f = 40 MHz
f = 66 MHz
ns
7.5
ns
10
ms
1
μs
Typical Values are given for VCC = 3.3 V and TA = 25ºC
Receiver Skew Margin is defined as the valid data sampling region at the receiver inputs. This margin takes into account the transmitter
pulse positions (min and max) and the receiver input setup and hold time (internal data sampling window - RSPos). This margin allows
for LVDS interconnect skew, inter-symbol interference (both dependent on type/length of cable), and clock jitter (less than 250 ps).
Total latency for the channel link chipset is a function of clock period and gate delays through the transmitter (TCCD) and receiver
(RCCD). The total latency for the DS90CR215/DS90CR285 transmitter and DS90CR216A/DS90CR286A receiver is: (T + TCCD) + (2*T
+ RCCD), where T = Clock period.
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Figure 1. “Worst Case” Test Pattern
LVCMOS Output
Figure 2. LVCMOS Output Load and Transition Times
Figure 3. Setup/Hold and High/Low Times
Figure 4. Clock In to Clock Out Delay
8
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SNLS043H – MAY 2000 – REVISED JANUARY 2016
Figure 5. Phase Lock Loop Set Time
RxCLK IN
(Differential)
RxIN3
(Single-Ended)
RxOUT5-1
RxOUT27-1
RxOUT23
RxOUT17
RxOUT16
RxOUT11
RxOUT10
RxOUT5
RxOUT27
RxIN2
(Single-Ended)
RxOUT20-1
RxOUT19-1
RxOUT26
RxOUT25
RxOUT24
RxOUT22
RxOUT21
RxOUT20
RxOUT19
RxIN1
(Single-Ended)
RxOUT9-1
RxOUT8-1
RxOUT18
RxOUT15
RxOUT14
RxOUT13
RxOUT12
RxOUT9
RxOUT8
RxIN0
(Single-Ended)
RxOUT1-1
RxOUT0-1
RxOUT7
RxOUT6
RxOUT4
RxOUT3
RxOUT2
RxOUT1
RxOUT0
Figure 6. DS90CR286A Mapping of 28 LVCMOS Parallel Data to 4D + C LVDS Serialized Data
RxCLK IN
(Differential)
RxIN2
(Single-Ended)
RxOUT15-1
RxOUT14-1
RxOUT20
RxOUT19
RxOUT18
RxOUT17
RxOUT16
RxOUT15
RxOUT14
RxIN1
(Single-Ended)
RxOUT8-1
RxOUT7-1
RxOUT13
RxOUT12
RxOUT11
RxOUT10
RxOUT9
RxOUT8
RxOUT7
RxIN0
(Single-Ended)
RxOUT1-1
RxOUT0-1
RxOUT6
RxOUT5
RxOUT4
RxOUT3
RxOUT2
RxOUT1
RxOUT0
Figure 7. DS90CR216A Mapping of 21 LVCMOS Parallel Data to 3D + C LVDS Serialized Data
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SNLS043H – MAY 2000 – REVISED JANUARY 2016
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Figure 8. Power Down Delay
Figure 9. DS90CR286A LVDS Input Strobe Position
10
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SNLS043H – MAY 2000 – REVISED JANUARY 2016
Figure 10. DS90CR216A LVDS Input Strobe Position
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SNLS043H – MAY 2000 – REVISED JANUARY 2016
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C—Setup and Hold Time (Internal data sampling window) defined by Rspos (receiver input strobe position) min and
max
Tppos—Transmitter output pulse position (min and max)
Cable Skew—typically 10 ps–40 ps per foot, media dependent
RSKM = Cable Skew (type, length) + Source Clock Jitter (cycle to cycle)(1) + ISI (Inter-symbol interference)(2)
(1)
Cycle-to-cycle jitter depends on the Tx source. if a Channel Link I Source Transmitter is used, clock jitter is
maintained to less than 250 ps at 66 MHz.
(2)
ISI is dependent on interconnect length; may be zero.
Figure 11. Receiver LVDS Input Skew Margin
12
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LVCMOS Output Amplitude (2.0 V/DIV)
LVCMOS Output Amplitude (2.0 V/DIV)
6.7 Typical Characteristics
Time (5.0 ns/DIV)
Time (20.0 ns/DIV)
Figure 13. Typical RxOUT Strobe Position at 66 MHz
LVCMOS Output Amplitude (2.0 V/DIV)
LVCMOS Output Amplitude (2.0 V/DIV)
Figure 12. Parallel PRBS-7 on LVCMOS Outputs at 66 MHz
Time (5.0 ns/DIV)
Figure 14. Typical RxOUT Setup Time at 66 MHz
(RSRC = 7.1 ns)
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Time (5.0 ns/DIV)
Figure 15. Typical RxOUT Hold Time at 66 MHz
(RHRC = 7.0 ns)
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7 Detailed Description
7.1 Overview
The DS90CR286A and DS90CR286A-Q1 are receivers that convert four LVDS (Low Voltage Differential
Signaling) data streams into parallel 28 bits of LVCMOS data (24 bits of RGB and 4 bits of HSYNC, VSYNC, DE,
and CNTL). The DS90CR216A is a receiver that converts three LVDS data streams back into parallel 21 bits of
LVCMOS data (18 bits of RGB and 3 bits of HSYNC, VSYNC, and DE). An internal PLL locks to the incoming
LVDS clock ranging from 20 to 66 MHz. The locked PLL ensures a stable clock to sample the output LVCMOS
data on the Receiver Clock Out rising edge. These devices feature a PWR DWN pin to put the device into low
power mode when there is no active input data.
28 x LVCMOS
Outputs
LVDS Clock
(20 to 66 MHz)
100 Q
100 Q
100 Q
4 x LVDS Data
(140 to 462 Mbps on
Each LVDS Channel)
4 x LVDS-to- 28-Bit LVCMOS
100 Q
100 Q
7.2 Functional Block Diagrams
Receiver Clock Out
PLL
PWR DWN
LVDS Clock
(20 to 66 MHz)
100 Q
100 Q
100 Q
3 x LVDS Data
(140 to 462 Mbps on
Each LVDS Channel)
3 x LVDS-to- 21-Bit LVCMOS
100 Q
Figure 16. DS90CR286A Block Diagram
21 x LVCMOS
Outputs
Receiver Clock Out
PLL
PWR DWN
Figure 17. DS90CR216A Block Diagram
14
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7.3 Feature Description
The DS90CR286A and DS90CR216A consist of several key blocks:
• LVDS Receivers
• Phase Locked Loop (PLL)
• Serial LVDS-to-Parallel LVCMOS Converter
• LVCMOS Drivers
7.3.1 LVDS Receivers
There are five differential LVDS inputs to the DS90CR286A and four differential LVDS inputs to the
DS90CR216A. Four of the LVDS inputs contain serialized data originating from a 28-bit source transmitter. For
the DS90CR216A, three of the LVDS inputs contain serialized data originating from a 21-bit source transmitter.
The remaining LVDS input contains the LVDS clock associated with the data pairs.
7.3.1.1 LVDS Input Termination
The DS90CR286A and DS90CR216A require a single 100-Ω terminating resistor across the true and
complement lines on each differential pair of the receiver input. To prevent reflections due to stubs, this resistor
should be placed as close to the device input pins as possible. Figure 18 shows an example.
Figure 18. LVDS Serialized Link Termination
7.3.2 Phase Locked Loop (PLL)
The Channel Link I devices use an internal PLL to recover the clock transmitted across the LVDS interface. The
recovered clock is then used as a reference to determine the sampling position of the seven serial bits received
per clock cycle. The width of each bit in the serialized LVDS data stream is one-seventh the clock period.
Differential skew (Δt within one differential pair), interconnect skew (Δt of one differential pair to another) and
clock jitter will all reduce the available window for sampling the LVDS serial data streams. Individual bypassing of
each VCC to ground will minimize the noise passed on to the PLL, thus creating a low jitter LVDS clock to
improve the overall jitter budget.
7.3.3 Serial LVDS-to-Parallel LVCMOS Converter
After the PLL locks to the incoming LVDS clock, the receiver deserializes each LVDS differential data pair into
seven parallel LVCMOS data outputs per clock cycle. For the DS90CR286A, the LVDS data inputs map to
LVCMOS outputs according to Figure 6. For the DS90CR216A, the LVDS data inputs map to LVCMOS outputs
according to Figure 7.
7.3.4 LVCMOS Drivers
The LVCMOS outputs from the DS90CR286A and DS90CR216A are the deserialized parallel single-ended data
from the serialized LVDS differential data pairs. Each LVCMOS output is clocked by the PLL and strobes on the
RxCLKOUT rising edge. All unused DS90CR286A and DS90CR216A RxOUT outputs can be left floating.
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7.4 Device Functional Modes
7.4.1 Power Down Mode
The DS90CR286A and DS90CR216A may be placed into a power down mode at any time by asserting the PWR
DWN pin (active low). The DS90CR286A and DS90CR216A are also designed to protect themselves from
accidental loss of power to either the transmitter or receiver. If power to the transmit board is lost, the receiver
clocks (input and output) stop. The data outputs (RxOUT) retain the states they were in when the clocks stopped.
When the receiver board loses power, the receiver inputs are shorted to VCC through an internal diode. Current is
limited to 5 mA per input, thus avoiding the potential for latch-up when powering the device.
16
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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
The DS90CR286A and DS90CR216A are designed for a wide variety of data transmission applications. The use
of serialized LVDS data lines in these applications allows for efficient signal transmission over a narrow bus
width, thereby reducing cost, power, and space.
8.2 Typical Applications
LVDS Cable or PCB Trace
DS90CR286A 28-Bit Rx
24-Bit RGB Display Unit
RxOUT[27:0]
100 Q
Graphics Processor Unit (GPU)
100 Q
28-Bit Tx Data
(4 LVDS Data, 1 LVDS Clock)
4 x LVDS-to- 28-Bit LVCMOS
100 Q
100 Q
LVDS Data
100 Q
LVDS Clock
RxCLK
PLL
Figure 19. Typical DS90CR286A Application Block Diagram
LVDS Cable or PCB Trace
DS90CR216A 21-Bit Rx
18-Bit RGB Display Unit
RxOUT[20:0]
Graphics Processor Unit (GPU)
100 Q
21-Bit Tx Data
(3 LVDS Data, 1 LVDS Clock)
3 x LVDS-to- 21-Bit LVCMOS
100 Q
100 Q
LVDS Data
100 Q
LVDS Clock
RxCLK
PLL
Figure 20. Typical DS90CR216A Application Block Diagram
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Typical Applications (continued)
8.2.1 Design Requirements
For this design example, ensure that the following requirements are observed.
Table 1. Design Parameters
DESIGN PARAMETER
DESIGN REQUIREMENTS
Operating Frequency
LVDS clock must be within 20-66 MHz.
DS90CR286A: No higher than 24 bpp. The maximum supported resolution is 8-bit RGB.
DS90CR216A: No higher than 18 bpp. The maximum supported resolution is 6-bit RGB.
Bit Resolution
Determine the appropriate mapping required by the panel display following the DS90CR286A
or DS90CR216A outputs.
Bit Data Mapping
RSKM (Receiver Skew Margin)
Ensure that there is acceptable margin between Tx pulse position and Rx strobe position.
Input Termination for RxIN±
100 Ω ± 10% resistor across each LVDS differential pair. Place as close as possible to IC
input pins.
RxIN± Board Trace Impedance
Design differential trace impedance with 100 Ω ± 5%
If unused, leave pins floating. Series resistance on each LVCMOS output optional to reduce
reflections from long board traces. If used, 33-Ω series resistance is typical.
LVCMOS Outputs
DC Power Supply Coupling Capacitors
Use a 0.1-µF capacitor to minimize power supply noise. Place as close as possible to VCC
pins.
8.2.2 Detailed Design Procedure
To design with the DS90CR286A or DS90CR216A, determine the following:
•
•
•
•
Cable Interface
Bit Resolution and Operating Frequency
Bit Mapping from Receiver to Endpoint Panel Display
RSKM Interoperability with Transmitter Pulse Position Margin
8.2.2.1 Cables
A cable interface between the transmitter and receiver needs to support the differential LVDS pairs. The
DS90CR216A requires four pairs of signal wires and the DS90CR286A requires five pairs of signal wires. The
ideal cable interface has a constant 100-Ω differential impedance throughout the path. It is also recommended
that cable skew remain below 150 ps (assuming 66 MHz clock rate) to maintain a sufficient data sampling
window at the receiver.
Depending upon the application and data rate, the interconnecting media between Tx and Rx may vary. For
example, for lower data rate (clock rate) and shorter cable lengths (< 2m), the media electrical performance is
less critical. For higher speed or long distance applications, the media's performance becomes more critical.
Certain cable constructions provide tighter skew (matched electrical length between the conductors and pairs).
For example, twin-coax cables have been demonstrated at distances as long as five meters and with the
maximum data transfer of 1.386 Gbps (DS90CR216A) and 1.848 Gbps (DS90CR286A).
8.2.2.2 Bit Resolution and Operating Frequency Compatibility
The bit resolution of the endpoint panel display reveals whether there are enough bits available in the
DS90CR286A or DS90CR216A to output the required data per pixel. The DS90CR286A has 28 parallel
LVCMOS outputs and can therefore provide a bit resolution up to 24 bpp (bits per pixel). In each clock cycle, the
remaining bits are the three control signals (HSync, VSync, DE) and one spare bit. The DS90CR216A has 21
parallel LVCMOS outputs and can therefore provide a bit resolution up to 18 bpp (bits per pixel). In each clock
cycle, the remaining bits are the three control signals (HSync, VSync, DE).
The number of pixels per frame and the refresh rate of the endpoint panel display indicate the required operating
frequency of the deserializer clock. To determine the required clock frequency, refer to the following formula:
f_Clk = [H_Active + H_Blank] × [V_Active + V_Blank] × f_Vertical
where
•
18
H_Active = Active Display Horizontal Lines
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•
•
•
•
•
H_Blank = Blanking Period Horizontal Lines
V_Active = Active Display Vertical Lines
V_Blank = Blanking Period Vertical Lines
f_Vertical = Refresh Rate (in Hz)
f_Clk = Operating Frequency of LVDS clock
(1)
In each frame, there is a blanking period associated with horizontal rows and vertical columns that are not
actively displayed on the panel. These blanking period pixels must be included to determine the required clock
frequency. Consider the following example to determine the required LVDS clock frequency:
• H_Active = 640
• H_Blank = 40
• V_Active = 480
• V_Blank = 41
• f_Vertical = 59.95 Hz
Thus, the required operating frequency is determined below:
[640 + 40] x [480 + 41] x 59.95 = 21239086 Hz ≈ 21.24 MHz
(2)
Since the operating frequency for the PLL in the DS90CR286A and DS90CR216A ranges from 20-66 MHz, the
DS90CR286A and DS90CR216A can support a panel display with the aforementioned requirements.
If the specific blanking interval is unknown, the number of pixels in the blanking interval can be approximated to
20% of the active pixels. The following formula can be used as a conservative approximation for the operating
LVDS clock frequency:
f_Clk ≈ H_Active x V_Active x f_Vertical x 1.2
(3)
Using this approximation, the operating frequency for the example in this section is estimated below:
640 x 480 x 59.95 x 1.2 = 22099968 Hz ≈ 22.10 MHz
(4)
8.2.2.3 Data Mapping between Receiver and Endpoint Panel Display
Ensure that the LVCMOS outputs are mapped to align with the endpoint display RGB mapping requirements
following the deserializer. Two popular mapping topologies for 8-bit RGB data are shown below:
1. LSBs are mapped to RxIN3±.
2. MSBs are mapped to RxIN3±.
The following tables depict how these two popular topologies can be mapped to the DS90CR286A outputs.
Table 2. 8-Bit Color Mapping with LSBs on RxIN3±
LVDS INPUT
CHANNEL
RxIN0
RxIN1
LVDS BIT STREAM
POSITION
LVCMOS OUTPUT
CHANNEL
COLOR MAPPING
TxIN0
RxOUT0
R2
TxIN1
RxOUT1
R3
TxIN2
RxOUT2
R4
TxIN3
RxOUT3
R5
TxIN4
RxOUT4
R6
TxIN6
RxOUT6
R7
TxIN7
RxOUT7
G2
TxIN8
RxOUT8
G3
TxIN9
RxOUT9
G4
TxIN12
RxOUT12
G5
TxIN13
RxOUT13
G6
TxIN14
RxOUT14
G7
TxIN15
RxOUT15
B2
TxIN18
RxOUT18
B3
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COMMENTS
MSB
MSB
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Table 2. 8-Bit Color Mapping with LSBs on RxIN3± (continued)
LVDS INPUT
CHANNEL
RxIN2
RxIN3
LVDS BIT STREAM
POSITION
LVCMOS OUTPUT
CHANNEL
COLOR MAPPING
TxIN19
RxOUT19
B4
TxIN20
RxOUT20
B5
TxIN21
RxOUT21
B6
TxIN22
RxOUT22
B7
MSB
TxIN24
RxOUT24
HSYNC
Horizontal Sync
TxIN25
RxOUT25
VSYNC
Vertical Sync
TxIN26
RxOUT26
DE
Data Enable
TxIN27
RxOUT27
R0
LSB
TxIN5
RxOUT5
R1
TxIN10
RxOUT10
G0
TxIN11
RxOUT11
G1
TxIN16
RxOUT16
B0
TxIN17
RxOUT17
B1
TxIN23
RxOUT23
GP
COMMENTS
LSB
LSB
General Purpose
Table 3. 8-Bit Color Mapping with MSBs on RxIN3±
LVDS INPUT
CHANNEL
RxIN0
RxIN1
RxIN2
RxIN3
20
LVDS BIT STREAM
POSITION
LVCMOS OUTPUT
CHANNEL
COLOR MAPPING
COMMENTS
TxIN0
RxOUT0
R0
LSB
TxIN1
RxOUT1
R1
TxIN2
RxOUT2
R2
TxIN3
RxOUT3
R3
TxIN4
RxOUT4
R4
TxIN6
RxOUT6
R5
TxIN7
RxOUT7
G0
TxIN8
RxOUT8
G1
TxIN9
RxOUT9
G2
TxIN12
RxOUT12
G3
TxIN13
RxOUT13
G4
TxIN14
RxOUT14
G5
TxIN15
RxOUT15
B0
TxIN18
RxOUT18
B1
TxIN19
RxOUT19
B2
TxIN20
RxOUT20
B3
TxIN21
RxOUT21
B4
TxIN22
RxOUT22
B5
TxIN24
RxOUT24
HSYNC
Horizontal Sync
TxIN25
RxOUT25
VSYNC
Vertical Sync
TxIN26
RxOUT26
DE
Data Enable
TxIN27
RxOUT27
R6
TxIN5
RxOUT5
R7
TxIN10
RxOUT10
G6
TxIN11
RxOUT11
G7
TxIN16
RxOUT16
B6
TxIN17
RxOUT17
B7
MSB
TxIN23
RxOUT23
GP
General Purpose
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LSB
LSB
MSB
MSB
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In either the case where the DS90CR216A is used or the DS90CR286A must support 18 bpp, Table 2 is
commonly used. With this mapping, MSBs of RGB data are retained on RXIN0±, RXIN1±, and RXIN2± while the
two LSBs for the original 8-bit RGB resolution are ignored from RxIN3±.
8.2.2.4 RSKM Interoperability
One of the most important factors when designing the receiver into a system application is assessing how much
RSKM (Receiver Skew Margin) is available. In each LVDS clock cycle, the LVDS data stream carries seven
serialized data bits. Ideally, the Transmit Pulse Position for each bit will occur every (n x T)/7 seconds, where n =
Bit Position and T = LVDS Clock Period. Likewise, ideally the Receive Strobe Position for each bit will occur
every ((n + 0.5) x T)/7 seconds. However, due to the effects of cable skew, clock jitter, and ISI, both LVDS
transmitter and receiver in real systems will have a minimum and maximum pulse and strobe position,
respectively, for each bit position. This concept is illustrated in Figure 21:
Rspos0
min
Tppos0
min
max
Bit 0 Left Margin
Rspos1
max
Ideal Rx Strobe
Position
Tppos1
Bit 0 Right Margin
Bit 1 Left Margin
max
min
min
max
Ideal Rx Strobe
Position
Bit0
Bit 1 Right Margin
Tppos2
max
min
Bit1
Figure 21. RSKM Measurement Example
All left and right margins for Bits 0-6 must be considered in order to determine the absolute minimum for the
whole LVDS bit stream. This absolute minimum corresponds to the RSKM.
To improve RSKM performance between LVDS transmitter and receiver, designers often either advance or delay
the LVDS clock compared to the LVDS data. Moving the LVDS clock compared to the LVDS data can improve
the location of the setup and hold time for the transmitter compared to the setup and hold time for the receiver.
If there is less left bit margin than right bit margin, the LVDS clock can be delayed so that the Rx strobe position
for incoming data appears to be delayed. If there is less right bit margin than left bit margin, all the LVDS data
pairs can be delayed uniformly so that the LVDS clock and Rx strobe position for incoming data appear to
advance. To delay an LVDS data or clock pair, designers either add more PCB trace length or install a capacitor
between the LVDS transmitter and receiver. It is important to note that when using these techniques, all
serialized bit positions are shifted right or left uniformly.
When designing the DS90CR286A or DS90CR216A receiver with a third-party OpenLDI transmitter, users must
calculate the skew margin budget (RSKM) based on the Tx pulse position and the Rx strobe position to ensure
error-free transmission. For more information about calculating RSKM, refer to Application Note SNLA249.
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8.2.3 Application Curves
TxIN7
TxIN6
TxIN4
TxIN3
TxIN2
TxIN1
TxIN0
LVDS Differential Clock
(500 mV/DIV)
LVDS Differential Input RxIN0±
(200 mV/DIV)
LVCMOS RXCLKOUT
(2 V/DIV)
LVCMOS RXCLKOUT
(2 V/DIV)
The following application curves are examples taken with a DS90C385 serializer interfacing to a DS90CR286A
deserializer in nominal temperature (25ºC) at an operating frequency of 66 MHz.
Time (5.0 ns/DIV)
Time (2.5 ns/DIV)
Figure 23. LVDS CLKIN aligned with LVCMOS RxCLKOUT
LVCMOS Amplitude (2 V/DIV)
LVCMOS Amplitude (2 V/DIV)
Figure 22. LVDS RxIN0± aligned with LVCMOS RxCLKOUT
Time (5.0 ns/DIV)
Figure 24. RxOUT Strobe on Rising Edge of RxCLKOUT
22
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Time (20.0 ns/DIV)
Figure 25. PRBS-7 Output on RxOUT Channels
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9 Power Supply Recommendations
Proper power supply decoupling is important to ensure a stable power supply with minimal power supply noise.
Bypassing capacitors are needed to reduce the impact of switching noise which could limit performance. For a
conservative approach three parallel-connected decoupling capacitors (Multi-Layered Ceramic type in surface
mount form factor) between each VCC and the ground plane(s) are recommended. The three capacitor values are
0.1 μF, 0.01 μF and 0.001 μF. The preferred capacitor size is 0402. An example is shown in Figure 26. The
designer should employ wide traces for power and ground and ensure each capacitor has its own via to the
ground plane. If board space is limiting the number of bypass capacitors, the PLL VCC should receive the most
filtering/bypassing. Next would be the LVDS VCC pins and finally the logic VCC pins.
Figure 26. Recommended Bypass Capacitor Decoupling Configuration
10 Layout
10.1 Layout Guidelines
As with any high speed design, board designers must maximize signal integrity by limiting reflections and
crosstalk that can adversely affect high frequency and EMI performance. The following practices are
recommended layout guidelines to optimize device performance.
• Ensure that differential pair traces are always closely coupled to eliminate noise interference from other
signals and take full advantage of the common mode noise canceling effect of the differential signals.
• Maintain equal length on signal traces for a given differential pair.
• Limit impedance discontinuities by reducing the number of vias on signal traces.
• Eliminate any 90º angles on traces and use 45º bends instead.
• If a via must exist on one signal polarity, mirror the via implementation on the other polarity of the differential
pair.
• Match the differential impedance of the selected physical media. This impedance should also match the value
of the termination resistor that is connected across the differential pair at the receiver's input.
• When possible, use short traces for LVDS inputs.
10.2 Layout Examples
The following images show an example layout of the DS90CR286A.Traces in blue correspond to the top layer
and the traces in green correspond to the bottom layer. Note that differential pair inputs to the DS90CR286A are
tightly coupled and close to the connector pins. In addition, observe that the power supply decoupling capacitors
are placed as close as possible to the power supply pins with through vias in order to minimize inductance. The
principles illustrated in this layout can also be applied to the 48-pin DS90CR216A.
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Layout Examples (continued)
Figure 27. Example Layout With DS90CR286A (U1)
100-Q >s ^
Terminations close to
RxIN pins
33 Q ^ Œ] • Z •]•š}Œ•
occasionally used to
reduce reflections
Figure 28. Example Layout Close-up
24
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11 Device and Documentation Support
11.1 Device Support
11.1.1 Third-Party Products Disclaimer
TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT
CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES
OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER
ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.
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 4. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
DS90CR216A
Click here
Click here
Click here
Click here
Click here
DS90CR286A
Click here
Click here
Click here
Click here
Click here
DS90CR286A-Q1
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
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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)
(3)
Device Marking
(4/5)
(6)
DS90CR216AMTD
NRND
TSSOP
DGG
48
38
Non-RoHS
& Green
Call TI
Level-2-235C-1 YEAR
-40 to 85
DS90CR216AMTD
>B
DS90CR216AMTD/NOPB
ACTIVE
TSSOP
DGG
48
38
RoHS & Green
SN
Level-2-260C-1 YEAR
-40 to 85
DS90CR216AMTD
>B
DS90CR216AMTDX/NOPB
ACTIVE
TSSOP
DGG
48
1000
RoHS & Green
SN
Level-2-260C-1 YEAR
-40 to 85
DS90CR216AMTD
>B
DS90CR286AMTD
NRND
TSSOP
DGG
56
34
Non-RoHS
& Green
Call TI
Level-2-235C-1 YEAR
-40 to 85
DS90CR286AMTD
>B
DS90CR286AMTD/NOPB
ACTIVE
TSSOP
DGG
56
34
RoHS & Green
SN
Level-2-260C-1 YEAR
-40 to 85
DS90CR286AMTD
>B
DS90CR286AMTDX/NOPB
ACTIVE
TSSOP
DGG
56
1000
RoHS & Green
SN
Level-2-260C-1 YEAR
-40 to 85
DS90CR286AMTD
>B
DS90CR286AQMT/NOPB
ACTIVE
TSSOP
DGG
56
34
RoHS & Green
SN
Level-2-260C-1 YEAR
-40 to 85
DS90CR286AQ
MT
DS90CR286AQMTX/NOPB
ACTIVE
TSSOP
DGG
56
1000
RoHS & Green
SN
Level-2-260C-1 YEAR
-40 to 85
DS90CR286AQ
MT
(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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