TDA7718B
3 band car audio processor
Datasheet - production data
Treble
– 2nd order frequency response
(10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz)
– Center frequency programmable in 4 steps
(10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz)
– -15 dB to 15 dB with 1 dB resolution
*$3*36
TSSOP28
Features
Input multiplexer
– QD1: quasi-differential stereo inputs
– SE1: stereo single-ended input
– SE2: stereo single-ended input
– SE3: stereo single-ended input
– FD full-differential or quasi-differential input
Loudness
– 2nd order frequency response
– Programmable center frequency
(400 Hz / 800 Hz / 2400 Hz)
– 15 dB with 1 dB steps
– Selectable high frequency boost
– Selectable flat-mode (constant attenuation)
Volume
– +23 dB to -31 dB with 1 dB step resolution
– Soft-step control with programmable blend
times
Bass
– 2nd order frequency response
– Center frequency programmable in 4 steps
(60 Hz / 80 Hz / 100 Hz / 200 Hz)
– Q programmable 1.0/1.25/1.5/2.0
– DC gain programmable
– -15 dB to 15 dB range with 1 dB resolution
Middle
– 2nd order frequency response
– Center frequency programmable in 4 steps
(500 Hz / 1 kHz / 1.5 kHz / 2.5 kHz)
– Q programmable 0.75/1.0/1.25
– -15 dB to 15 dB range with 1 dB resolution
September 2013
This is information on a product in full production.
Speaker
– 4 independent soft-step speaker controls
– +15 dB to -79 dB with 1 dB steps
– Direct mute
Subwoofer
– 2nd order low pass filter with programmable
cut off frequency (55 Hz / 85 Hz / 120 Hz /
160 Hz)
– 2 independent soft-step level control,
+15 dB to –79 dB with 1 dB steps
Mute functions
– Direct mute
– Digitally controlled soft-mute with 4
programmable mute-times
(0.48 ms/0.96 ms/8 ms/16 ms)
Offset detection
– Offset voltage detection circuit for on-board
power amplifier failure diagnosis
Description
The TDA7718B is a high performance signal
processor specifically designed for car radio
applications. The device includes a high
performance audioprocessor with fully integrated
audio filters and new soft-step architecture. The
digital control allows programming in a wide range
of filter characteristics.
Table 1. Device summary
Order code
Package
Packing
TDA7718B
TSSOP28
Tube
TDA7718BTR
TSSOP28
Tape and reel
DocID18305 Rev 3
1/40
www.st.com
1
Contents
TDA7718B
Contents
1
Block circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Pin connection and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
4
2.1
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Description of the audioprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1
4.2
4.1.1
Quasi-differential stereo input (QD1) . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.2
Single-ended stereo input (SE1, SE2, SE3) . . . . . . . . . . . . . . . . . . . . . 13
4.1.3
Full-differential or quasi-differential stereo input (FD/QD2) . . . . . . . . . . 13
Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.1
Loudness attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.2
Peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.3
High frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.4
Flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3
Soft-mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4
Soft-step volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5
Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.6
4.7
2/40
Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.5.1
Bass attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5.2
Bass center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5.3
Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5.4
DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6.1
Middle attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.2
Middle center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.3
Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
DocID18305 Rev 3
TDA7718B
5
Contents
4.7.1
Treble attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.2
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.8
Subwoofer filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.9
Soft-step control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.10
DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.11
Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.12
Application note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
I2C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.1
Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2
I2C bus electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.3
5.2.1
Receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2.2
Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2.3
Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
DocID18305 Rev 3
3/40
List of tables
TDA7718B
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Table 20.
Table 21.
Table 22.
4/40
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
I2C bus electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Main selector (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Soft-mute / others (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Soft-step I (5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Soft-step II / DC detector (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Loudness (7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Volume / output gain (8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Treble filter (9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Middle filter (10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Bass filter (11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Subwoofer / middle / bass (12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Speaker attenuation (FL/FR/RL/RR/SWL/SWR) (13-18) . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Testing audio processor 1 (19) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Testing audio processor 2 (20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Testing audio processor 3 (21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
DocID18305 Rev 3
TDA7718B
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FD/QD block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Loudness attenuation @ fP = 400 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Loudness center frequencies @ attn. = 15 dB.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Loudness attenuation, fc = 2.4 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Soft-mute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bass control @ fC = 80 Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Bass center frequencies @ gain = 14 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Bass quality factors @ gain = 14 dB, fC = 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Bass normal and DC mode @ gain = 14 dB, fC = 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Middle control @ fC = 1 kHz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Middle center frequencies @ gain = 14 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Middle quality factors @ gain = 14 dB, fC = 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Treble control @ fC = 17.5 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Treble center frequencies @ gain = 14 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Subwoofer cut frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
DC offset detection circuit (simplified) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
I2C bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
I2C bus data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
TSSOP28 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
DocID18305 Rev 3
5/40
6/40
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DocID18305 Rev 3
)'54'5
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Block circuit diagram
TDA7718B
Block circuit diagram
Figure 1. Block circuit diagram
*$3*36
0$,1,138708/7,3/(;(5
TDA7718B
Pin connection and pin description
2
Pin connection and pin description
2.1
Pin connection
Figure 2. Pin connection (top view)
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2.2
Pin description
Table 2. Pin description
No.
Pin name
Description
1
SE1L
Single-end input left
I
2
SE1R
Single-end input right
I
3
SE2L
Single-end input left
I
4
SE2R
Single-end input right
I
5
SE3L
Single-end input left
I
6
SE3R
Single-end input right
I
7
QD1L
quasi-differential stereo inputs left
I
8
QD1G
quasi-differential stereo inputs common
I
9
QD1R
quasi-differential stereo inputs right
I
10
FD1L+/QD2L
Full differential + input left or quasi-differential left
I
DocID18305 Rev 3
I/O
7/40
Pin connection and pin description
TDA7718B
Table 2. Pin description (continued)
No.
Pin name
Description
I/O
11
FD1L-/QD2G
Full differential - input left or quasi-differential ground
I
12
FD1R-/QD2G
Full differential - input right or quasi-differential ground
I
13
FD1R+/QD2R
Full differential + input right or quasi-differential right
I
14
CREF
Reference capacitor
O
15
GND
Ground
S
16
OUTSWR
Subwoofer right output
O
17
OUTSWL
Subwoofer left output
O
18
OUTRF
Front right output
O
19
OUTRR
Rear right output
O
20
OUTLR
Rear left output
O
21
OUTLF
Front left output
O
22
WinTC
DC offset detector filter output
O
23
MUTE
External mute pin
I
24
VCC
Supply
S
SCL
2C
I
bus clock
I
26
SDA
I2C
bus data
I/O
27
DC_ERR
28
WIN_IN
25
Note:
8/40
DC offset detector output
O
DC offset detector input
I
The L & R channels may be swapped as per the user's wishes making use of proper
connections to the device pins, with no impact on electrical performance. Software control
has to take into account the external routing and be designed accordingly.
DocID18305 Rev 3
TDA7718B
Electrical specifications
3
Electrical specifications
3.1
Thermal data
Table 3. Thermal data
Symbol
Rth-j amb
3.2
Description
Value
Unit
114
°C/W
Value
Unit
10.5
V
7
V
Thermal resistance junction-to-ambient
Absolute maximum ratings
Table 4. Absolute maximum ratings
Symbol
Operating supply voltage
VS
Vin_max
3.3
Parameter
Maximum voltage for signal input pins
Tamb
Operating ambient temperature
-40 to 85
°C
Tstg
Storage temperature range
-55 to 150
°C
Electrical characteristics
VS = 8.5 V; Tamb= 25 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified
Table 5. Electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
Supply
Vs
Supply voltage
-
7.5
8.5
10
V
Is
Supply current
-
23
29
35
mA
Input selector
Rin
Input resistance
All single ended inputs
70
100
130
k
VCL
Clipping level
Input gain = 0 dB
2
-
-
VRMS
SIN
Input separation
-
-
95
-
dB
Differential stereo inputs
Input resistance
Differential
70
100
-
k
CMRR
Common mode rejection ratio for
main source
VCM = 1 VRMS @ 1 kHz
44
60
-
dB
VCM = 1 VRMS @ 10 kHz
44
60
-
dB
eNo
Output noise @ speaker outputs
-
12
22
µV
Rin
20 Hz - 20 kHz, A-weighted;
all stages 0 dB
DocID18305 Rev 3
9/40
Electrical specifications
TDA7718B
Table 5. Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
Loudness control
AMAX
Max attenuation
-
14
15
16
dB
ASTEP
Step resolution
-
0.5
1
1.5
dB
fP1
-
400
-
Hz
fP2
-
800
-
Hz
fP3
-
2400
-
Hz
22
23
24
dB
fPeak
Peak frequency
Volume control
GMAX
Max gain
-
AMAX
Max attenuation
-
-
-31
-30
dB
ASTEP
Step resolution
-
0.5
1
1.5
dB
EA
Attenuation set error
-
-0.75
0
+0.75
dB
ET
Tracking error
-
-
-
2
dB
Adjacent attenuation steps
-3
0.1
3
mV
From 0 dB to GMIN
-5
0.5
5
mV
-
80
100
-
dB
VDC
DC steps
Soft-mute
AMUTE
TD
Mute attenuation
Delay time
T1
0.35
0.48
0.65
ms
T2
0.7
0.96
1.3
ms
T3
5.6
7.6
9.6
ms
T4
12.3
15.3
18.3
ms
Low threshold for SM pin
-
-
-
1
V
VTH High High threshold for SM pin
-
2.5
-
-
V
VTH Low
RPU
Internal pull-up resistor
-
32
45
58
k
VPU
Internal pull-up voltage
-
3
3.3
3.6
V
fC1
-
60
-
Hz
fC2
-
80
-
Hz
fC3
-
100
-
Hz
Bass control
Fc
QBASS
Center frequency
Quality factor
fC4
-
200
-
Hz
Q1
-
1
-
-
Q2
-
1.25
-
-
Q3
-
1.5
-
-
-
2
-
-
-
±14
±15
±16
dB
-
0.5
1
1.5
dB
DC = off
-1
0
+1
dB
±4.3
±4.7
±5.1
dB
Q4
CRANGE Control range
ASTEP
Step resolution
DCGAIN
Bass-DC-gain
10/40
DC = on, gain = ±15 dB
DocID18305 Rev 3
TDA7718B
Electrical specifications
Table 5. Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
-
±14
±15
±16
dB
-
0.5
1
1.5
dB
fC1
-
500
-
Hz
fC2
-
1
-
kHz
fC3
-
1.5
-
kHz
fC4
-
2.5
-
kHz
Q1
-
0.75
-
-
Q2
-
1
-
-
Q3
-
1.25
-
-
-
±14
±15
±16
dB
-
Middle control
CRANGE Control range
ASTEP
fc
Step resolution
Center frequency
QMIDDLE Quality factor
Treble control
CRANGE Clipping level
ASTEP
fc
Step resolution
Center frequency
0.5
1
1.5
dB
fC1
-
10
-
kHz
fC2
-
12.5
-
kHz
fC3
-
15
-
kHz
fC4
-
17.5
-
kHz
Speaker attenuators
GMAX
Max gain
-
14
15
16
dB
AMAX
Max attenuation
-
-
-79
-74
dB
ASTEP
Step resolution
-
0.5
1
1.5
dB
AMUTE
Mute attenuation
-
80
90
-
dB
Attenuation set error
-
-
-
2
dB
DC steps
Adjacent attenuation steps
-
0.1
5
mV
d = 0.3 %; byte8_D6=1
2
-
-
VRMS
2.2
-
-
VRMS
-
-
20
100
W
EE
VDC
Audio outputs
VCL
ROUT
Clipping level
Output impedance
d = 1 %; byte8_D6=0
RL
Output load resistance
-
2
-
-
k
CL
Output load capacitor
-
-
-
10
nF
DC voltage level
-
3.8
4.0
4.2
V
fLP1
-
55
-
Hz
fLP2
-
85
-
Hz
fLP3
-
120
-
Hz
fLP4
-
160
-
Hz
VDC
Subwoofer lowpass
fLP
Lowpass corner frequency
DocID18305 Rev 3
11/40
Electrical specifications
TDA7718B
Table 5. Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
V1
±10
±25
±40
mV
V2
±30
±50
±70
mV
V3
±50
±75
±100
mV
V4
DC offset detection circuit
Vth
tsp
Zero comp. window size
Max rejected spike length
±70
±100
±130
mV
-
2
11
30
µs
-
5
22
50
µs
-
10
33
70
µs
-
15
44
90
µs
ICHDCErr DCErr charge current
-
2
5
8
µA
IDISDCErr DCErr discharge current
-
4
5
9
mA
VOutH
DCErr high voltage
-
3
3.3
3.6
V
VOutL
DCErr low voltage
-
-
100
300
mV
BW=20 Hz to 20 kHz AWeighted, all gain = 0 dB
-
12
22
µV
BW=20 Hz - 20 kHz AWeighted, Output muted
-
7
12
µV
98
104
-
dB
General
eNO
Output noise
Signal to noise ratio
all gain = 0 dB, A-weighted;
Vo = 2 VRMS
D
Distortion
VIN =1 VRMS; all stages 0 dB
-
0.01
0.1
%
SC
Channel separation left/right
-
-
90
-
dB
S/N
12/40
DocID18305 Rev 3
TDA7718B
Description of the audioprocessor
4
Description of the audioprocessor
4.1
Input stages
One quasi-differential stereo input, one full-differential/quasi-differential stereo input and
three single-ended inputs are available.
4.1.1
Quasi-differential stereo input (QD1)
The QD input is implemented as a buffered quasi-differential stereo stage with 100 k inputimpedance at each input. There is -3 dB attenuation at QD input stage.
4.1.2
Single-ended stereo input (SE1, SE2, SE3)
The input-impedance at each input is 100 k and the attenuation is fixed to -3 dB for
incoming signals.
4.1.3
Full-differential or quasi-differential stereo input (FD/QD2)
This device provides a full-differential stereo input stage (FD) or 2nd quasi-differential stereo
input stage. The full differential is a buffered full-differential stereo stage with 100 k inputimpedance at each input. When using as QD2 application, it needs to connect the two
QD2G pins together from external and the input impedance at QDG becomes 50 k. There
is -3 dB attenuation at the input stage. Figure 3 shows the block diagram of this input stage.
DocID18305 Rev 3
13/40
Description of the audioprocessor
TDA7718B
Figure 3. FD/QD block diagram
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4.2
Loudness
There are four parameters programmable in the loudness stage.
14/40
DocID18305 Rev 3
TDA7718B
4.2.1
Description of the audioprocessor
Loudness attenuation
Figure 4 shows the attenuation as a function of frequency at fP = 400 Hz.
Figure 4. Loudness attenuation @ fP = 400 Hz.
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Peak frequency
Figure 5 shows the four possible peak-frequencies at 400, 800 and 2400 Hz.
Figure 5. Loudness center frequencies @ attn. = 15 dB.
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DocID18305 Rev 3
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15/40
Description of the audioprocessor
4.2.3
TDA7718B
High frequency boost
Figure 6 shows the different Loudness shapes in low and high frequency boost.
Figure 6. Loudness attenuation, fc = 2.4 kHz
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Flat mode
In flat mode the loudness stage works as a 0 dB to -15 dB attenuator.
4.3
Soft-mute
The digitally controlled soft-mute stage allows muting/demuting the signal with a I2C bus
programmable slope. The mute process can either be activated by the soft-mute pin or by
the I2C bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see Figure 7).
For timing purposes the bit 0 of the I2C bus output register is set to 1 from the start of muting
until the end of demuting.
Figure 7. Soft-mute timing
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Please notice that a started mute-action is always terminated and could not be interrupted
by a change of the mute –signal.
DocID18305 Rev 3
TDA7718B
4.4
Description of the audioprocessor
Soft-step volume
When the volume-level is changed audible clicks could appear at the output. The root cause
of those clicks could either be a DC-offset before the volume-stage or the sudden change of
the envelope of the audio signal. With the soft-step-feature both kinds of clicks could be
reduced to a minimum and are no more audible. The blend-time from one step to the next is
programmable as 5 ms or 10 ms. The soft-step control is described in detail in Chapter 4.9.
4.5
Bass
There are four parameters programmable in the bass stage:
Bass attenuation
Figure 8 shows the attenuation as a function of frequency at a center frequency of 80 Hz.
Figure 8. Bass control @ fC = 80 Hz, Q = 1
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DocID18305 Rev 3
17/40
Description of the audioprocessor
4.5.2
TDA7718B
Bass center frequency
Figure 9 shows the four possible center frequencies 60, 80, 100 and 200 Hz.
Figure 9. Bass center frequencies @ gain = 14 dB, Q = 1
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4.5.3
Quality factors
Figure 10 shows the four possible quality factors 1, 1.25, 1.5 and 2.
Figure 10. Bass quality factors @ gain = 14 dB, fC = 80 Hz
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18/40
DocID18305 Rev 3
TDA7718B
4.5.4
Description of the audioprocessor
DC mode
In this mode the DC-gain is increased by 4.4 dB. In addition the programmed center
frequency and quality factor is decreased by 25 % which can be used to reach alternative
center frequencies or quality factors.
Figure 11. Bass normal and DC mode @ gain = 14 dB, fC = 80 Hz
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1. The center frequency, Q and DC-mode can be set fully independently.
4.6
Middle
There are three parameters programmable in the middle stage:
DocID18305 Rev 3
19/40
Description of the audioprocessor
4.6.1
TDA7718B
Middle attenuation
Figure 12 shows the attenuation as a function of frequency at a center frequency of 1 kHz.
Figure 12. Middle control @ fC = 1 kHz, Q = 1
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Middle center frequency
Figure 13 shows the four possible center frequencies 500 Hz, 1 kHz, 1.5 kHz and 2.5 kHz.
Figure 13. Middle center frequencies @ gain = 14 dB, Q = 1
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20/40
DocID18305 Rev 3
*$3*36
TDA7718B
4.6.3
Description of the audioprocessor
Quality factors
Figure 14 shows the three possible quality factors 0.75, 1 and 1.25.
Figure 14. Middle quality factors @ gain = 14 dB, fC = 1 kHz
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Treble
There are two parameters programmable in the treble stage:
Treble attenuation
Figure 15 shows the attenuation as a function of frequency at a center frequency of
17.5 kHz.
Figure 15. Treble control @ fC = 17.5 kHz.
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DocID18305 Rev 3
21/40
Description of the audioprocessor
4.7.2
TDA7718B
Center frequency
Figure 16 shows the four possible center frequencies 10 k, 12.5 k, 15 k and 17.5 kHz.
Figure 16. Treble center frequencies @ gain = 14 dB
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4.8
Subwoofer filter
The subwoofer lowpass filter has Butterworth characteristics with programmable cut-off
frequency (55 Hz / 85 Hz / 120 Hz / 160 Hz). The output phase can be selected between 0
deg and 180 deg. The input of subwoofer takes signal from bass filter output or output of
input mux.
Figure 17. Subwoofer cut frequencies
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22/40
DocID18305 Rev 3
*$3*36
TDA7718B
4.9
Description of the audioprocessor
Soft-step control
In this device, the soft-step function is available for volume, speaker, loudness, treble,
middle and bass block. With soft-step function, the audible noise of DC offset or the sudden
change of signal can be avoided when adjusting gain setting of the block.
For each block, the soft-step function is controlled by soft-step soft-step on/off control bit in
the control table. The soft-step transient time selection (5 ms or 10 ms) is common for all
blocks and it is controlled by soft-step time control bit. The soft-step operation of all blocks
has a common centralized control. In this case, a new soft-step operation can not be started
before the completion previous soft-step.
There are two different modes to activate the soft-step operation. The soft-step operation
can be started right after I2C data sending, or the soft-step can be activated in parallel after
data sending of several different blocks. The two modes are controlled by the ‘act bit’ (it is
normally bit7 of the byte.) of each byte. When act bit is ‘0’, which means action, the soft-step
is activated right after the date byte is sent. When the act bit is ‘1’, which means wait, the
block goes to wait for soft-step status. In this case, the block will wait for some other block to
activate the operation. The soft-step operation of all blocks in wait status will be done
together with the block which activate the soft-step. With this mode, all specific blocks can
do the soft-step in parallel. This avoids waiting when the soft-step is operated one by one.
Chip Addr
Sub Addr
0xxxxxxx
| Soft-step start here
Chip Addr
Sub Addr
1xxxxxxx
1xxxxxxx
......
0xxxxxxx
| Soft-step
start here for all
DocID18305 Rev 3
23/40
Description of the audioprocessor
4.10
TDA7718B
DC offset detector
Using the DC offset detection circuit (Figure 18) an offset voltage difference between the
audio power amplifier and the APR's Front and Rear outputs can be detected, preventing
serious damage to the loudspeakers. The circuit compares whether the signal crosses the
zero level inside the audio power at the same time as in the speaker cell. The output of the
zero-window-comparator of the power amplifier must be connected with the WinIn-input of
the APR. The WinIn-input has an 50k internal pull-up resistor connected to 3.3 V. It is
recommended to drive this pin with open-collector outputs only.
To compensate for errors at low frequencies the WinTC-pin are implemented, with external
capacitors introducing the same delay = 7.5 k * Cext as the AC-coupling between the
APR and the power amplifier introduces. For the zero window comparators, the time
constant for spike rejection as well as the threshold are programmable.
For electrical characteristics see Chapter 3 on page 9.
A low-active DC-offset error signal appears at the DCErr output if the next conditions are
both true:
a)
Front and rear outputs are inside zero crossing windows.
b)
The Input voltage VWinIn is logic low whenever at least one output of the power
amplifier is outside the zero crossing windows.
After power-on, the external attached capacitor is rapidly charged (fast-charge) to overcome
a false indication.
Figure 18. DC offset detection circuit (simplified)
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4.11
Description of the audioprocessor
Audioprocessor testing
In the test mode, which can be activated by setting bit D7 of the I2C subaddress byte and bit
D0 of the testing audioprocessor byte, several internal signals are available at the SE1L pin.
In this mode, the input resistance of 100 k is disconnected from the pin. Internal signals
available for testing are listed in the data-byte specification.
Figure 19. Application schematic
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4.12
Application note
Above application schematic shows a proposal typical application that QD1 and FD/QD2 is
used as external signal sources. To limit the leakage current from signal source a 1 k
resistor is recommended to put between de-coupling capacitor and pin if the output
impedance of external signal source is less than 1 k.
It's guaranteed that all input pins (pin 1~13) will not be broken even if 2Vrms input signal is
applied to the pins when CSP is power off.
DocID18305 Rev 3
25/40
I2C bus specification
TDA7718B
5
I2C bus specification
5.1
Interface protocol
The interface protocol comprises:
a start condition (S)
a chip address byte (the LSB determines read/write transmission)
a subaddress byte
a sequence of data (N-bytes + acknowledge)
a stop condition (P)
the max. clock speed is 400 kbit/s
3.3 V logic compatible
Figure 20. I2C bus interface protocol
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S = Start
ACK = Acknowledge
5.2
I2C bus electrical characteristics
Table 6. I2C bus electrical characteristics
Symbol
26/40
Parameter
Min
Max
Unit
-
400
kHz
fSCL
SCL clock frequency
VIH
High level input voltage
2.4
-
V
VIL
Low level input voltage
-
0.8
V
tHD,STA
Hold time for START
0.6
-
µs
tSU,STO
Setup time for STOP
0.6
-
µs
tLOW
Low period for SCL clock
1.3
-
µs
tHIGH
High period for SCL clock
0.6
-
µs
tF
Fall time for SCL/SDA
-
300
ns
tR
Rise time for SCL/SDA
-
300
ns
tHD,DAT
Data hold time
0
-
ns
tSU,DAT
Data setup time
100
-
ns
DocID18305 Rev 3
I2C bus specification
TDA7718B
Figure 21. I2C bus data
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5.2.1
S
Receive mode
1 0
0 0 1 0
0
AC
K
R/W
TS
X
AI
A4
A3
A2
A1
A0
ACK
DAT
A
ACK
P
S = Start
R/W =
"0" -> Receive Mode (Chip can be programmed by µP)
"1" -> Transmission Mode (Data could be received by µP)
ACK = Acknowledge
P = Stop
TS = Testing mode
AI = Auto increment
5.2.2
S
Transmission mode
1
0
0
0
1
0
0
R/W
ACK
X
X
X
X
X
X
BZ
SM
ACK
P
SM = Soft-mute activated for main channel
BZ = Soft-step Busy (‘0’ = Busy)
X = Not used
The transmitted data is automatic updated after each ACK. Transmission can be repeated
without new chip address.
DocID18305 Rev 3
27/40
I2C bus specification
5.2.3
TDA7718B
Reset condition
A Power-On-Reset is invoked if the supply voltage is below than 3.5 V. After that the
registers are initialized to the default data written in following tables.
Table 7. Subaddress (receive mode)
MSB
LSB
Function
I2
I1
I0
A4
A3
A2
A1
A0
0
1
-
-
-
-
-
-
-
Testing mode
Off
On
-
x
-
-
-
-
-
-
Not used
-
-
0
1
-
-
-
-
-
Auto increment mode
Off
On
-
-
-
0
0
0
0
0
Main selector
-
-
-
0
0
0
0
1
Not used
-
-
-
0
0
0
1
0
Not used
-
-
-
0
0
0
1
1
Not used
-
-
-
0
0
1
0
0
Soft-mute / others
-
-
-
0
0
1
0
1
Soft-step I
-
-
-
0
0
1
1
0
Soft-step II / DC-detector
-
-
-
0
0
1
1
1
Loudness
-
-
-
0
1
0
0
0
Volume / output gain
-
-
-
0
1
0
0
1
Treble
-
-
-
0
1
0
1
0
Middle
-
-
-
0
1
0
1
1
Bass
-
-
-
0
1
1
0
0
Subwoofer / middle / bass
-
-
-
0
1
1
0
1
Speaker attenuator left front
-
-
-
0
1
1
1
0
Speaker attenuator right front
-
-
-
0
1
1
1
1
Speaker attenuator left rear
-
-
-
1
0
0
0
0
Speaker attenuator right rear
-
-
-
1
0
0
0
1
Subwoofer attenuator left
-
-
-
1
0
0
1
0
Subwoofer attenuator right
-
-
-
1
0
0
1
1
Testing audio processor 1
-
-
-
1
0
1
0
0
Testing audio processor 2
-
-
-
1
0
1
0
1
Testing audio processor 3
28/40
DocID18305 Rev 3
I2C bus specification
TDA7718B
5.3
Data byte specification
Table 8. Main selector (0)
MSB
LSB
Function
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Main source selector
SE1
SE3
QD1
FD/ QD2
SE2
Mute
Mute
Mute
-
-
-
-
-
-
-
-
-
0
1
-
-
-
FD / QD2 selection
FD
QD2
-
-
-
0
1
-
-
-
-
Main source input gain select
0 dB
3 dB
-
-
0
1
-
-
-
-
-
Subwoofer flat
Off
On
x
x
-
-
-
-
-
-
Not used
Not used (1-3)
DocID18305 Rev 3
29/40
I2C bus specification
TDA7718B
Table 9. Soft-mute / others (4)
MSB
LSB
Function
D7
D6
D5
D4
D3
D2
D1
D0
-
-
-
-
-
-
-
0
1
-
-
-
-
-
-
0
1
-
Pin influence for mute
Pin and IIC
IIC
0
0
1
1
0
1
0
1
-
-
Soft-mute time
0.48 ms
0.96 ms
7.68 ms
15.36 ms
Soft-mute
On
Off
-
-
-
-
-
-
-
0
1
-
-
-
-
Subwoofer input source
Input mux
Bass output
-
-
0
1
-
-
-
-
-
Subwoofer enable (OUTSWL & OUTSWR)
On
Off
-
0
1
-
-
-
-
-
-
Fast charge
On
Off
0
1
-
-
-
-
-
-
-
Anti-alias filter
On
Off (bypass)
30/40
DocID18305 Rev 3
I2C bus specification
TDA7718B
Table 10. Soft-step I (5)
MSB
LSB
Function
D7
D6
D5
D4
D3
D2
D1
D0
-
-
-
-
-
-
-
0
1
-
-
-
-
-
-
0
1
-
Volume soft-step
On
Off
-
-
-
-
-
0
1
-
-
Treble soft-step
On
Off
Loudness soft-step
On
Off
-
-
-
-
0
1
-
-
-
Middle soft-step
On
Off
-
-
-
0
1
-
-
-
-
Bass soft-step
On
Off
-
-
0
1
-
-
-
-
-
Speaker LF soft-step
On
Off
-
0
1
-
-
-
-
-
-
Speaker RF soft-step
On
Off
-
Speaker LR soft-step
On
Off
0
1
-
-
-
-
-
-
DocID18305 Rev 3
31/40
I2C bus specification
TDA7718B
Table 11. Soft-step II / DC detector (6)
MSB
LSB
Function
D7
D6
D5
D4
D3
D2
D1
D0
-
-
-
-
-
-
-
0
1
-
-
-
-
-
-
0
1
-
Subwoofer left soft-step
On
Off
-
-
-
-
-
0
1
-
-
Subwoofer right soft-step
On
Off
-
Soft-step time
5 ms
10 ms
-
Zero-comparator window size
±100 mV
±75 mV
±50 mV
±25 mV
-
Spike rejection time constant
11 µs
22 µs
33 µs
44 µs
-
-
0
0
1
1
32/40
-
-
0
1
0
1
-
-
0
0
1
1
0
1
0
1
-
-
0
1
-
-
-
-
-
-
-
-
DocID18305 Rev 3
Speaker RR soft-step
On
Off
I2C bus specification
TDA7718B
Table 12. Loudness (7)
MSB
D7
-
-
-
0
1
LSB
D6
-
-
0
1
-
D5
D4
-
-
0
0
1
1
0
1
0
1
-
-
-
-
D3
D2
D1
D0
0
0
:
1
1
0
0
:
1
1
0
0
:
1
1
0
1
:
0
1
-
-
-
-
-
-
-
-
-
Function
Attenuation
0 dB
-1 dB
:
-14 dB
-15 dB
-
Center frequency
Flat
400 Hz
800 Hz
2400 Hz
-
High boost
On
Off
-
Soft-step action
Act
Wait
Table 13. Volume / output gain (8)
MSB
D7
-
-
0
1
LSB
D6
-
D5
D4
D3
D2
D1
D0
0
0
:
0
0
:
0
0
:
0
1
:
1
:
1
0
0
:
0
1
:
1
1
:
1
0
:
0
:
1
0
0
:
1
0
:
0
1
:
1
0
:
1
:
1
0
0
:
1
0
:
1
0
:
1
0
:
1
:
1
0
0
:
1
0
:
1
0
:
1
0
:
1
:
1
0
1
:
1
0
:
1
0
:
1
0
:
1
:
1
Function
Gain/attenuation
+0 dB
+1 dB
:
+15 dB
+16 dB
:
+23 dB
Not used
:
Not used
-0 dB
:
-15 dB
:
-31 dB
0
1
-
-
-
-
-
-
Output gain
1 dB
0 dB
-
-
-
-
-
-
-
Soft-step action
Act
Wait
DocID18305 Rev 3
33/40
I2C bus specification
TDA7718B
Table 14. Treble filter (9)
MSB
D7
-
-
0
1
LSB
D6
D5
-
-
0
0
1
1
0
1
0
1
-
-
D4
D3
D2
D1
D0
0
0
:
0
0
1
1
:
1
1
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
1
:
0
1
1
0
:
1
0
Function
Gain/attenuation
-15 dB
-14 dB
:
-1 dB
0 dB
0 dB
+1 dB
:
+14 dB
+15 dB
-
-
-
-
-
Treble center frequency
10.0 kHz
12.5 kHz
15.0 kHz
17.5 kHz
-
-
-
-
-
Soft-step action
Act
Wait
Table 15. Middle filter (10)
MSB
LSB
Function
D7
-
-
0
1
34/40
D6
-
D5
-
0
0
1
1
0
1
0
1
-
-
D4
D3
D2
D1
D0
0
0
:
0
0
1
1
:
1
1
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
1
:
0
1
1
0
:
1
0
Gain/attenuation
-15 dB
-14 dB
:
-1 dB
0 dB
0 dB
+1 dB
:
+14 dB
+15 dB
-
-
-
-
-
Middle Q factor
0.75
1
1.25
Reserved
-
-
-
-
-
Soft-step action
Act
Wait
DocID18305 Rev 3
I2C bus specification
TDA7718B
Table 16. Bass filter (11)
MSB
D7
-
-
0
1
LSB
D6
D5
-
-
0
0
1
1
0
1
0
1
-
-
D4
D3
D2
D1
D0
0
0
:
0
0
1
1
:
1
1
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
1
:
0
1
1
0
:
1
0
-
-
-
-
-
-
-
-
-
-
Function
Gain/attenuation
-15 dB
-14 dB
:
-1 dB
0 dB
0 dB
+1 dB
:
+14 dB
+15 dB
Bass Q factor
1.0
1.25
1.5
2.0
Soft-step action
Act
Wait
Table 17. Subwoofer / middle / bass (12)
MSB
D7
LSB
D6
D5
D4
D3
D2
D1
D0
0
0
1
1
0
1
0
1
-
-
-
-
-
-
-
-
-
-
-
0
1
-
-
-
-
-
0
0
1
1
0
1
0
1
-
-
-
0
0
1
1
0
1
0
1
-
-
-
-
-
-
-
-
-
-
-
-
-
0
1
DocID18305 Rev 3
Function
Subwoofer cut-off frequency
55 Hz
85 Hz
120 Hz
160 Hz
Subwoofer output phase
180 deg
0 deg
Middle center frequency
500 Hz
1000 Hz
1500 Hz
2500 Hz
Bass center frequency
60 Hz
80 Hz
100 Hz
200 Hz
Bass DC mode
On
Off
35/40
I2C bus specification
TDA7718B
Table 18. Speaker attenuation (FL/FR/RL/RR/SWL/SWR) (13-18)
MSB
D7
-
0
1
LSB
D6
D5
D4
D3
D2
D1
D0
0
0
:
0
0
0
:
1
1
1
0
0
:
0
0
0
:
0
0
1
0
0
:
0
1
1
:
1
1
x
0
0
:
1
0
0
:
1
1
x
0
0
:
1
0
0
:
1
1
x
0
0
:
1
0
0
:
1
1
x
0
1
:
1
0
1
:
0
1
x
-
-
-
-
-
-
-
Function
Gain/attenuation
0 dB
1 dB
:
+15 dB
-0 dB
-1 dB
:
-78 dB
-79 dB
mute
Soft-step action
Act
Wait
Table 19. Testing audio processor 1 (19)
MSB
D7
-
LSB
D6
-
D5
-
D4
D3
D2
D1
-
-
-
-
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
D0
0
1
-
-
-
-
-
0
1
-
-
-
-
-
-
0
1
-
-
-
-
-
-
0
1
-
-
-
-
-
-
-
1. The control bit needs both I2C test mode on & sub-address test mode on.
2. The control bit does not depend on test mode.
36/40
DocID18305 Rev 3
-
Function
Audio processor testing mode
Off
On
Test multiplexer at SE1L (1)
SSCLK
REQ
SMCLK
DCDet Vth High
DCDet Vth Low
IntZeroErr
Ref5V5
VGB1.95
Clock200k
SDCLK
VrefDCO
Clock fast mode (2)
On
Off
Clock source (2)
External
Internal (200 kHz)
Attenuator gain clock control (2)
On
Off
I2C bus specification
TDA7718B
Table 20. Testing audio processor 2 (20)
MSB
D7
-
-
-
-
-
LSB
D6
-
-
-
-
-
D5
-
-
-
-
-
D4
-
-
-
0
0
1
1
0
0
1
1
D3
-
-
-
0
1
0
1
0
1
0
1
D2
-
-
0
1
-
-
D1
Function
D0
-
0
1
0
1
-
-
-
Test architecture (1)
Normal
Split
-
Oscillator clock (2)
400 kHz
800 kHz
-
Soft-step curve (2)
S-Curve
Linear curve
-
Manual set busy signal (1)
Auto
Auto
0
1
-
Request for clk generator (1)
Allow
Allow
Stopped
Stopped
-
-
0
1
-
-
-
-
-
No DCO spike rejection(1)
On
Off
x
x
-
-
-
-
-
-
Not used
1. The control bit needs sub-address test mode on.
2. The control bit does not depend on test mode.
Table 21. Testing audio processor 3 (21)
MSB
D7
-
-
-
LSB
D6
-
-
-
D5
-
-
-
D4
-
-
-
D3
-
-
-
D2
-
-
0
1
D1
-
0
1
-
Function
D0
0
1
Enable clock for FL/FR/RL/RR/SWL/SWR
On
Off
-
Enable clock for volume
On
Off
-
Enable clock for treble and bass
On
Off
-
-
-
-
0
1
-
-
-
Enable clock for loudness and middle
On
Off
x
x
x
x
-
-
-
-
Not used
DocID18305 Rev 3
37/40
Package information
6
TDA7718B
Package information
n order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 22. TSSOP28 mechanical data and package dimensions
MM
INCH
$)-
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490
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$
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*$3*36
38/40
DocID18305 Rev 3
TDA7718B
7
Revision history
Revision history
Table 22. Document revision history
Date
Revision
Changes
10-Dec-2010
1
Initial release.
26-Feb-2013
2
Added “Note” on page 8.
24-Sep-2013
3
Updated disclaimer.
DocID18305 Rev 3
39/40
TDA7718B
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