ST TDA7342EQ2N User Manual
Features
■ Input multiplexer
– Two stereo and one mono inputs
– One quasi differential input
– Selectable input gain for optimal adaptation
to different sources
■ Fully programmable loudness function
■ Volume control in 0.3dB steps including gain
up to 20dB
■ Zero crossing mute, soft mute and direct mute
■ Bass and treble control
■ Four speaker attenuators
– Four independent speakers control in
1.25dB steps for balance and fader facilities
– Independent mute function
■ All functions programmable via serial I
2
C bus
Description
The audioprocessor TDA7342EQ2N is an
upgrade of the TDA731X audioprocessor family.
TDA7342EQ2N
Digitally controlled audio processor
TQFP32
Due to a highly linear signal processing, using
CMOS-switching techniques instead of standard
bipolar multipliers, very low distortion and very
low noise are obtained. Several new features like
softmute, and zero-crossing mute are
implemented. The soft Mute function can be
activated in two ways:
1. Via serial bus (Mute byte, bit D0)
2. Directly on pin 21 through an I/O line of the
microcontroller
Very low DC stepping is obtained by use of a
BICMOS technology.
Order codes
Part number Package Packing
TDA7342EQ2N TQFP32 Tray
TDA7342EQ2NTR TQFP32 Tape and reel
August 2006 Rev 1 1/21
www.st.com
1
Contents TDA7342EQ2N
Contents
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pns description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Quick reference data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Data Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Start and Stop Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Byte Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5 Transmission without Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Auto increment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3 Transmitted data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.4 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21
TDA7342EQ2N List of tables
List of tables
Table 1. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 2. Quick reference data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. SUBADDRESS (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 6. Send mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 7. Input selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 8. Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 9. Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 10. Speaker attenuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 11. Bass/Treble. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 12. Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 13. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3/21
List of figures TDA7342EQ2N
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pin connection (Top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Data Validity on the I2C BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 4. Timing Diagram of I2C BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5. Acknowledge on the I2C BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6. TQFP32 Mechanical Data & Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4/21
TDA7342EQ2N Block diagram
1 Block diagram
Figure 1. Block diagram
BUS
+Vcc
R2
C17 2.7nF
4.7K
100nF 100nF
C9
C14 C15
C11
TREBLE(L)
47nF
BOUT(L) BIN(L)
LOUD(L)
OUT(L) IN(L)
32
18 17
9
16 15
ATT
SPKR
OUT
LEFT FRONT
24
MUTE
TREBLE
BASS
VOL
LOUD+
ZERO
CROSS +
ATT
SPKR
MUTE
OUT
22
SCL
LEFT REAR
SDA
DIGGND
ADDR
292726
25
MUTE
SPKR
SERIAL BUS DECODER + LATCHES
SOFT
MUTE
ATT
OUT
RIGHT FRONT
23
MUTE
LOUD+
ZERO
CROSS +
TREBLE
BASS
VOL
MUTE
ATT
SPKR
OUT
RIGHT REAR
21
D93AU043B
MUTE
C16
TREBLE(R)
C12 C13
BOUT(R) BIN(R)
20 19 1
SM
C
CSMOUT(R)CREF
C10
LOUD(R)
2 4
IN(R)
314
2.7nF
100nF100nF
R1 4.7K
47nF
47nF
C8
INPUT
+ GAIN
SELECTOR
L1
13
L1
C1
LEFT
L2
12
L2
INPUTS
L3
M
11
L3
C2
C6
10
SGND
CD
R3
5
R3
C3
C7
M
R2
8
6
M
R2
MONO INPUT
R1
7
R1
C4
RIGHT
INPUTS
C5
SUPPLY
10µF
30 31 28
S
V
5/21
Pns description TDA7342EQ2N
2 Pns description
Figure 2. Pin connection (Top view)
S
TR L
GND
ADDR
CREF
SCL
SDA
DIG GND
24
23
22
21
20
19
18
17
OUT LF
OUT RF
OUT LR
OUT RR
BOUT R
BIN R
BOUT L
BIN L
TR R
IN R
OUT R
LOUD R
IN R3
IN R2
IN R1
MONO
V
323031 29 28 27 26 25
1
2
3
4
5
6
7
8
910
11 12 13 14 15 16
LOUD L
CD GND
IN L3
IN L2
IN L1
CSM
IN L
OUT L
D94AU060A
6/21
TDA7342EQ2N Electrical specifications
3 Electrical specifications
3.1 Absolute maximum ratings
Table 1. Absolute Maximum Ratings
Symbol Parameter Value Unit
V
Operating Supply Voltage 10.5 V
S
T
amb
T
3.2 Quick reference data
Table 2. Quick reference data
Symbol Parameter Min. Typ. Max. Unit
V
V
THD Total Harmonic Distortion V = 1Vrms f = 1KHz 0.01 0.08 %
S/N Signal to Noise Ratio 106 dB
Operating Ambient Temperature -40 to 85 °C
Storage Temperature Range -55 to 150 °C
stg
Supply Voltage 6 9 10.2 V
S
Max. input signal handling 2.1 2.6 Vrms
CL
Channel Separation 100 dB
S
C
Volume Control 0.3dB step -59.7 20 dB
Treble Control 2dB step -14 +14 dB
Bass Control 2dB step -10 +18 dB
Fader and Balance Control 1.25dB step -38.75 0 dB
Input Gain 3.75dB step 0 11.25 dB
Mute Attenuation 100 dB
3.3 Thermal data
Table 3. Thermal data
Symbol Parameter Value Unit
R
th j-amb
Thermal Resistance Junction-pins 150 °C/W
7/21
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