ST TDA7718N User Manual
Features
■ Input multiplexer
– QD1: quasi-differential stereo inputs
– SE1: stereo single-ended input
– SE2: stereo single-ended input
– SE3: stereo single-ended input
– FD1 / SE4+SE5: 1 full-differential input or 2
stereo single-ended inputs
■ Loudness
■ Volume
■ Bass
■ Middle
■ Treble
nd
–2
order frequency response
– Programmable center frequency
(400 Hz / 800 Hz / 2400 Hz)
– 15dB with 1dB steps
– Selectable high frequency boost
– Selectable flat-mode (constant attenuation)
– +23 dB to -31 dB with 1 dB step resolution
– Soft-step control with programmable blend
times
nd
–2
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
nd
–2
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
nd
–2
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
TDA7718N
3 band car audio processor
TSSOP28
■ Speaker
– 4 independent soft step speaker controls
– +15 dB to -79 dB with 1 dB steps
– Direct mute
■ Subwoofer
■ Mute functions
■ Offset detection
Description
The TDA7718N 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
nd
–2
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
– Direct mute
– Digitally controlled SoftMute with 4
programmable mute-times
(0.48 ms/0.96 ms/8 ms/16 ms)
– Offset voltage detection circuit for on-board
power amplifier failure diagnosis
Order code Package Packing
TDA7718N TSSOP28 Tube
TDA7718NTR TSSOP28 Tape and reel
October 2009 Doc ID 16502 Rev 1 1/40
www.st.com
1
Contents TDA7718N
Contents
1 Block circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Pin connection and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Description of the audioprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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 stereo input or single-ended input (FD1/QD2/SE4+SE5)
13
4.2 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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 SoftMute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4 SoftStep volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5 Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5.1 Bass attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5.2 Bass center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5.4 DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6 Middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.1 Middle attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.2 Middle center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7 Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/40 Doc ID 16502 Rev 1
TDA7718N Contents
4.7.1 Treble attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.8 Subwoofer filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.9 Softstep control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.10 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.11 Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5I
2
C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.1 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2 I
2
C bus electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2.1 Receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2.2 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2.3 Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Doc ID 16502 Rev 1 3/40
List of tables TDA7718N
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 6. I
Table 7. Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 8. Main selector (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 9. Soft mute / others (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 10. SoftStep I (5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 11. SoftStep II / DC detector (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 12. Loudness (7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 13. Volume / output gain (8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 14. Treble filter (9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 15. Middle filter (10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 16. Bass filter (11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 17. Subwoofer / middle / bass (12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 18. Speaker attenuation (FL/FR/RL/RR/SWL/SWR) (13-18) . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 19. Testing audio processor 1 (19) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 20. Testing audio processor 2 (20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 21. Testing audio processor 3 (21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 22. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2
C bus electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4/40 Doc ID 16502 Rev 1
TDA7718N List of figures
List of figures
Figure 1. Block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. FD / QD / SE block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 4. Loudness attenuation @ fP = 400 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 5. Loudness center frequencies @ attn. = 15 dB.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 6. Loudness attenuation, f
Figure 7. SoftMute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 8. Bass control @ fC = 80 Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 9. Bass center frequencies @ gain = 14 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 10. Bass quality factors @ gain = 14 dB, f
Figure 11. Bass normal and DC mode @ gain = 14 dB, f
Figure 12. Middle control @ fC = 1 kHz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 13. Middle center frequencies @ gain = 14 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 14. Middle quality factors @ gain = 14 dB, f
Figure 15. Treble control @ fC = 17.5 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 16. Treble center frequencies @ gain = 14 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 17. Subwoofer cut frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 18. DC offset detection circuit (simplified) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 19. Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 20. I
Figure 21. I
2
C bus interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2
C bus data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 22. TSSOP28 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
= 2.4 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
c
= 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
C
C
= 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . 19
C
= 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Doc ID 16502 Rev 1 5/40
Block circuit diagram TDA7718N
1 Block circuit diagram
Figure 1. Block circuit diagram
OUTLF
OUTRF
OUTLR
OUTRR
OUTSWL
OUTSWR
MONO FADER
MONO FADER
MONO FADER
MONO FADER
MONO FADER
BASS
MONO FADER
Detector
DC-Offset
WIN_TC DC_ERR
WIN_IN
MUTE
TREBLE MIDDLE
VOLUME
SOFT
MUTE
LOUDNESS
SUBWOOFER
C BUS
2
I
DIGITAL
CONTROL
SUPPLY
MAIN INPUT MULTIPLEXER
SDASCLVCC GND CREF
SE1L
SE2L
SE2R
SE3L
SE3R
QD1L
SE1R
6/40 Doc ID 16502 Rev 1
QD1R
QD1G
FD1L+/QD2L/SE4L
FD1L-/QD2G/SE4R
FD1R-/QD2G/SE5L
FD1R+/QD2R/SE5R
TDA7718N Pin connection and pin description
2 Pin connection and pin description
2.1 Pin connection
Figure 2. Pin connection (top view)
FD1L+/QD2L/SE4L OUTRR
FD1L-/QD2G/SE4R
FD1R-/QD2G/SE5L
FD1R+/QD2R/SE5R OUTSWR
2.2 Pin description
Table 2. Pin description
SE1L
SE1R
SE2L
SE2R
SE3L
SE3R
QD1L
QD1G
QD1R OUTLR
2
3
4
5
6
7
8
9
10
12
13
28
27
26
25
24
23
22
21
20
19
18
17
16
1514CREF GND
Winin1
DCErr
SDA
SCL
VCC
MUTE
WINTC
OUTLF
OUTRF11
OUTSWL
No. Pin name Description I/O
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/SE4L Full differential + input left or quasi-differential left or single-end input left I
Doc ID 16502 Rev 1 7/40
Pin connection and pin description TDA7718N
Table 2. Pin description (continued)
No. Pin name Description I/O
11 FD1L-/QD2G/SE4R Full differential - input left or quasi-differential ground or single-end input right I
12 FD1R-/QD2G/SE5L Full differential - input right or quasi-differential ground or single-end input left I
13 FD1R+/QD2R/SE5R Full differential + input right or quasi-differential right or single-end input 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
2
25 SCL I
26 SDA I
27 DC_ERR DC offset detector output O
28 WIN_IN DC offset detector input I
C bus clock I
2
C bus data I/O
8/40 Doc ID 16502 Rev 1
TDA7718N Electrical specifications
3 Electrical specifications
3.1 Thermal data
Table 3. Thermal data
Symbol Description Value Unit
R
th-j amb
Thermal resistance junction-to-ambient 114 °C/W
3.2 Absolute maximum ratings
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
V
V
in_max
T
T
S
amb
stg
Operating supply voltage 10.5 V
Maximum voltage for signal input pins 7 V
Operating ambient temperature -40 to 85 °C
Storage temperature range -55 to 150 °C
3.3 Electrical characteristics
VS = 8.5 V; T
Table 5. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
Supply
= 25 °C; RL= 10 kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified
amb
Supply voltage - 7.5 8.5 10 V
V
s
Supply current - 23 29 35 mA
I
s
Input selector
R
V
S
Input resistance All single ended inputs 70 100 130 kΩ
in
Clipping level Input gain = 0 dB 2 - - V
CL
Input separation - - 95 - dB
IN
Differential stereo inputs
R
CMRR
e
Input resistance Differential 70 100 - kΩ
in
Common mode rejection ratio for
main source
Output noise @ speaker outputs
No
RMS
= 1 V
V
CM
1 V
V
CM =
20 Hz - 20 kHz, A-weighted;
all stages 0 dB
@ 1 kHz 44 60 - dB
RMS
@ 10 kHz 44 60 - dB
RMS
-1222µV
Doc ID 16502 Rev 1 9/40
Electrical specifications TDA7718N
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
Loudness control
A
A
STEP
f
Peak
Volu m e cont r o l
Max attenuation - 14 15 16 dB
MAX
Step resolution - 0.5 1 1.5 dB
Peak frequency
f
P1
f
P2
f
P3
- 400 - Hz
- 800 - Hz
- 2400 - Hz
G
A
A
V
STEP
E
Max gain - 22 23 24 dB
MAX
Max attenuation - - -31 -30 dB
MAX
Step resolution - 0.5 1 1.5 dB
Attenuation set error - -0.75 0 +0.75 dB
A
Tracking error - - - 2 dB
E
T
DC steps
DC
Soft mute
A
MUTE
V
TH Low
V
TH High
R
V
Mute attenuation - 80 100 - dB
Delay time
T
D
Low threshold for SM pin - - - 1 V
High threshold for SM pin - 2.5 - - V
Internal pull-up resistor - 32 45 58 kΩ
PU
Internal pull-up voltage - 3 3.3 3.6 V
PU
Bass control
Fc Center frequency
Q
BASS
C
RANGE
A
STEP
DC
Quality factor
Control range - ±14 ±15 ±16 dB
Step resolution - 0.5 1 1.5 dB
Bass-DC-gain
GAIN
Adjacent attenuation steps -3 0.1 3 mV
From 0 dB to G
MIN
-5 0.5 5 mV
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
f
C1
f
C2
f
C3
f
C4
Q
1
Q
2
Q
3
Q
4
-60 -Hz
-80 -Hz
- 100 - Hz
- 200 - Hz
-1 - -
-1.25 - -
-1.5 - -
-2 - -
DC = off -1 0 +1 dB
DC = on, gain = ±15 dB ±4.3 ±4.7 ±5.1 dB
10/40 Doc ID 16502 Rev 1
TDA7718N Electrical specifications
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
Middle control
C
RANGE
A
STEP
Q
MIDDLE
Treble control
Control range - ±14 ±15 ±16 dB
Step resolution - 0.5 1 1.5 dB
Center frequency
f
c
Quality factor
f
C1
f
C2
f
C3
f
C4
Q
1
Q
2
Q
3
- 500 - Hz
-1 -kHz
-1.5 -kHz
-2.5 -kHz
-0.75 - -
-1 - -
-1.25 - -
C
RANGE
A
STEP
Clipping level - ±14 ±15 ±16 dB
Step resolution - 0.5 1 1.5 dB
Center frequency
f
c
Speaker attenuators
G
A
A
A
MUTE
V
STEP
E
Max gain - 14 15 16 dB
MAX
Max attenuation - - -79 -74 dB
MAX
Step resolution - 0.5 1 1.5 dB
Mute attenuation - 80 90 - dB
Attenuation set error - - - 2 dB
E
DC steps Adjacent attenuation steps - 0.1 5 mV
DC
Audio outputs
V
R
V
Clipping level
CL
Output impedance - - 30 100 Ω
OUT
R
Output load resistance - 2 - - kΩ
L
C
Output load capacitor - - - 10 nF
L
DC voltage level - 3.8 4.0 4.2 V
DC
Subwoofer lowpass
f
Lowpass corner frequency
LP
f
C1
f
C2
f
C3
f
C4
- 10 - kHz
- 12.5 - kHz
- 15 - kHz
- 17.5 - kHz
d = 0.3 %; byte8_D6=1 2 - - V
d = 1 %; byte8_D6=0 2.2 - - V
f
f
f
f
LP1
LP2
LP3
LP4
-55 -Hz
-85 -Hz
- 120 - Hz
- 160 - Hz
RMS
RMS
Doc ID 16502 Rev 1 11/40
Electrical specifications TDA7718N
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max. Unit
DC offset detection circuit
V1 ±10 ±25 ±40 mV
V
I
CHDCErr
I
DISDCErr
V
OutH
V
OutH
Zero comp. window size
th
Max rejected spike length
t
sp
DCErr charge current - 2 5 8 µA
DCErr discharge current - 4 5 9 mA
DCErr high voltage - 3 3.3 3.6 V
DCErr low voltage - - 100 300 mV
General
e
NO
Output noise
S/N Signal to noise ratio
DDistortion VIN =1 V
S
Channel separation left/right - - 90 - dB
C
V2 ±30 ±50 ±70 mV
V3 ±50 ±75 ±100 mV
V4 ±70 ±100 ±130 mV
- 2 11 30 µs
- 5 22 50 µs
-103370µs
-154490µs
BW=20 Hz to 20 kHz AWeighted, all gain = 0 dB
BW=20 Hz - 20 kHz AWeighted, Output muted
all gain = 0 dB, A-weighted;
= 2 V
V
o
RMS
all stages 0 dB - 0.01 0.1 %
RMS;
-1222µV
-712µV
98 104 - dB
12/40 Doc ID 16502 Rev 1
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