SGS Thomson Microelectronics TDA7401D, TDA7401 Datasheet
DIGITALLYCONTROLLEDAUDIO PROCESSOR
WITH LOUDSPEAKERS EQUALIZER
FOURHIGHPASS CHANNELS
ONE STEREO LOW PASS CHANNEL WITH
GAIN CONTROL
DIRECTMUTEPIN
FULLY PROGRAMMABLEVIA I
DESCRIPTION
The TDA7401 is an upgrade of the TDA7435
audioprocessor.
Due to a highly linear signal processing, using
CMOS-switching techniques very low distortion
and verylow noise are obtained.
Second order high pass and low pass filters with
programmable corner frequencies provide the
loudspeakerequalization.
BLOCK DIAGRAM
2
C BUS
TDA7401
SO28
ORDERING NUMBER: TDA7401D
Very low DC stepping is obtained by using a
BICMOStechnology.
HP FL 1
HP FL 2
HP FR 1
HP FR 2
HP RL 1
HP RL 2
HP RR 1
HP RR 2
AUX 1 IN L
AUX 1 IN R
22
21
20
19
18
17
16
15
1
2
HP FILTER
HP FILTER
HP FILTER
HP FILTER
GAIN
+20/-79dB
MUTE
MUTE
45
CR1 CL1 CR2 CL2
SDA SCL DGND AGND CREF V
3
I2C BUS SUPPLY
MUX
76
CC
282324252627
D98AU822A
12
10
11
13
14
9
8
OUT REF
HP FL OUT
HP FR OUT
HP RL OUT
HP RR OUT
AUX 2 OUT L
AUX 2 OUT R
January 1999
1/10
TDA7401
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
T
amb
T
stg
PIN CONNECTION
Operating Supply Voltage 10.5 V
Operating Ambient Temperature -40 to 85 °C
Storage Temperature Range -55 to 150 °C
AUX 1 IN L
AUX 1 IN R
MUTE
CR1
CL1
CL2
CR2
AUX 2 OUT R
AUX 2 OUT L HP FR 1
HP FL OUT HP FR 2
HP FR OUT
OUT REF
HP RL OUT HP RR 1
1
2
3
4
5
6
7
8
9
10
12
13
28
27
26
25
24
23
22
21
20
19
18
17
16
1514HP RR OUT HP RR 2
D98AU823A
V
CC
SDA
SCL
DGND
AGND
CREF
HP FL 1
HP FL 2
HP RL 111
HP RL 2
THERMAL DATA
Symbol Parameter Value Unit
R
th j-amb
Thermal Resistance Junction-pins 65 °C/W
QUICK REFERENCE DATA
Symbol Parameter Min. Typ. Max. Unit
V
V
CL
THD Total Harmonic Distortion V = 1Vrms f = 1KHz 0.01 0.08 %
S/N Signalto Noise Ratio 106 dB
S
V
REF
2/10
Supply Voltage 6 9 10.2 V
S
Max. input signal handling 2.1 2.6 Vrms
Channel Separation f = 1KHz -80 100 dB
C
Reference Voltage Output (pin 12) 4.2 4.5 4.8 V
TDA7401
ELECTRICALCHARACTERISTICS (VS= 9V; RL= 10KΩ;Rg=50Ω;T
=25°C; all gains= 0dB;
amb
f = 1KHz. Refer to the test circuit,unless otherwisespecified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
INPUTSTAGE:AUX1
R
V
CL
S
Input Resistance 37.5 50 62.5 KΩ
I
Clipping Level d ≤ 0.3% 2.1 2.6 V
Input Separation 80 100 dB
I
GAIN CONTROL
G
MAX
A
MAX
A
STEP
E
A
E
T
V
DC
Maximum Input Gain 20 dB
Maximum Attenuation 79 dB
Step Resolution 0.5 1 1.5 dB
Attenuation Set Error G = -20 to +20dB -1.25 0 +1.25 dB
G = -60 to -20dB -4 3 dB
Tracking Error 2dB
DC Steps Adiacent Attenuation Steps 0.1 3 mV
From 0dB to G
MIN
0.5 5 mV
AUDIO OUTPUT(Pin 8 - 9, 10 - 14)
V
clip
R
L
R
O
V
DC
Clipping Level d = 0.3% 2.1 2.6 Vrms
Output Load Resistance AC coupled 2 K
Output Impedance 30 100 Ω
DC Voltage Level 4.2 4.5 4.8 V
STAGE:HP FILTER
R1 Resistance at pin HP1 HIGHPASS BYTE = XXXX1000 127.5 170 212.5 K
R2 Resistance at pin HP2 1 MΩ
V
CL
Clipping Level d ≤ 0.3% 2.1 2.6 Vrms
MUTE
A
V
R
MUTE
THM
INT
Mute Attenuation 80 100 dB
Mute Threshold 1.2 1.7 2.2 V
Pullup Resistor (pin3)
(note 1)
37.5 50 62.5 K
GENERAL
V
CC
I
CC
PSRR Power Supply Rejection Ratio f = 1KHz 60 70 dB
e
NO
S/N Signal to NoiseRatio All Gains = 0dB; V
S
C
d Distortion V
Supply Voltage 6 9 10.2 V
Supply Current 7 8 9 mA
Output Noise NonInvertingOutputMuted(B=
3.5 15
20 to 20kHz flat)
All Gains0dB(B=20to20kHz
515µV
flat)
O
=1V
rms
106 dB
Channel Separation 80 100 dB
=1V 0.01 0.08 %
IN
BUS INPUTS
V
IL
V
lH
I
lN
V
O
Note 1: Internal pullup resistor to 3.3V;”LOW” = mute active
Input Low Voltage 0.8 V
Input High Voltage 2.5 V
Input Current VIN= 0.4V -5 5 µA
OutputVoltageSDA
IO= 1.6mA 0.1 0.4 V
Acknowledge
RMS
µ
Ω
Ω
Ω
V
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