Document
TDA7449
Digital tone control audio processor
Datasheet - production data
Description
The TDA7449 is a volume tone (bass and treble)
) SO20 ct(s Features rodu Input multiplexer
– Two stereo inputs
P – Selectable input gain for optimal adaptation te to different sources le One stereo output so Treble and bass control in 2.0 db steps b Volume control in 1.0 db steps - O Two speaker attenuators: ) – Two independent speaker controls in t(s 1.0 db steps to facilitate balance c – Independent mute function du All functions are programmable via serial bus
balance (left/right) processor for quality audio applications in TV systems. Selectable input gain is provided. A serial bus controls all functions.
The AC signal setting is obtained by resistor networks and switches combined with operational amplifiers.
Bipolar/CMOS technology used allows obtaining low distortion, low noise and DC stepping.
Table 1. Device summary
Order code
Package
Packing
TDA7449D13TR
SO20
Tape and reel
lete Pro 8 o L-IN1
100K
bs 9 O L-IN2
100K
Figure 1. Block diagram
MUXOUTL 10
TREBLE(L) BIN(L) BOUT(L)
16
15
14
RB
G
VOLUME
TREBLE
BASS
SPKR ATT LEFT
5 LOUT
7 R-IN1
100K
6 R-IN2
100K
0/30dB 2dB STEP
I2CBUS DECODER + LATCHES
19 SCL
20 SDA
18 DIG_GND
G
VOLUME
TREBLE
BASS
SPKR ATT RIGHT
VREF
INPUT MULTIPLEXER + GAIN
11 MUXOUTR
SUPPLY RB
17
12
13
1
TREBLE(R) BIN(R) BOUT(R) CREF
4 ROUT
2 3 VS
AGND D98AU847A
September 2014
This is information on a product in full production.
DocID006317 Rev 5
1/21
www.st.com
Contents
Contents
TDA7449
1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Electrical characteristics and test circuit . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Application recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Bass, stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Treble stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
t(s) 3.3 CREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
duc 4
I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ro 4.1 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
te P 4.2 Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
le 4.3 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
so 4.4 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
b 4.5 Transmission without acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
t(s) - O 5
Software specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
c 5.1 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
rodu 6
Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
P 6.1 No incremental bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
te6.2 Incremental bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Obsole 7
Data bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21
DocID006317 Rev 5
TDA7449
1
Overview
Overview
Table 2. Absolute maximum ratings
Symbol
Parameter
Value
Unit
VS Tamb Tstg
Operating supply voltage Operating ambient temperature Storage temperature range
10.5
V
0 to 70
C
-55 to 150
C
Figure 2. Pin connections
t(s) CREF c VS u PGND d ROUT ro LOUT P R_IN2 te R_IN1 le L_IN1 so L_IN2 Ob MUXOUT(L)
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
D98AU848
SDA SCL DIG_GND TREBLE(R) TREBLE(L) BIN(L) BOUT(L) BOUT(R) BIN(R) MUXOUT(R)
t(s) -Table 3. Thermal data
c Symbol
Parameter
du Rth j-pin Thermal resistance junction pins
Value 85
Unit °C/W
Pro Table 4. Quick reference data
teSymbol
Parameter
ole VS bs VCL O THD
Supply voltage Max input signal handling Total harmonic distortion V = 0.1 Vrms f = 1 kHz
Min. Typ. Max. Unit
6
9 10.2 V
2
VRMS
0.01 0.1 %
S/N Signal-to-noise ratio Vout = 1 Vrms (mode = OFF) SC Channel separation f = 1 KHz
Input gain (2 dB step)
106
dB
90
dB
0
30 dB
Volume control (1 dB step)
-47
0 dB
Treble control (2 dB step)
-14
14 dB
Bass control (2 dB step)
-14
14 dB
Bala.