 English |
|
|
|
|
|
|
|
| TS4974_07 Datasheet, PDF (4/25 Pages) STMicroelectronics – 1W differential audio power amplifier with up/down digital volume control pins | |||
| |||
| ◁ |
Typical application schematics
2
Typical application schematics
TS4974
Figure 1. Typical application schematics for the TS4974
VCC VCC
Volume DOWN S1
Rpu1
470k
Rpu2
470k
VCC
Volume UP
S2
Cs
Rpd1 Rpd1
1µF
470k 470k
U1
Vin- P1
DIGITAL VOLUME
CONTROL
Cin1
1 Vin-
Vout- 9
Speaker
Vin+
P2
330nF
Cin2
330nF
2 Vin+
3 BYP ASS
Cb
1µF
BIAS
STBY
+
Vout+ 8
8 Ohms
TS4974 DFN10
STBY
STBY control
Table 3. External component descriptions
Components
Functional description
Rpu1, Rpu2
Rpd1, Rpd2
CIN
CS
CB
Pair of pull-up (Rpu1, Rpu2) or pull down (Rpd1, Rpd2) resistors that are
connected to the digital volume control pins UP/DVC and DOWN/DVC.
See Section 4.9: Volume setting on page 20.
Input coupling capacitors that block the DC voltage at the amplifier input
terminal. They form together with the amplifierâs differential input impedance
ZIN a first order high pass filter with a -3dB cut-off frequency
(fcut-off = 1 / (2 x Ï x ZIN x CIN)).
See Section 4.2: Low frequency response on page 16.
Supply bypass capacitor that provides power supply filtering.
See Section 4.4: Decoupling of the circuit on page 19.
Bypass pin capacitor that provides half supply filtering.
See Section 4.4: Decoupling of the circuit on page 19.
4/25
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese