TS4974_07 STMICROELECTRONICS [STMicroelectronics], TS4974_07 Datasheet - Page 4

• Manufacturer Part Number: TS4974_07
• Description: 1W differential audio power amplifier with up/down digital volume control pins
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Typical application schematics
2
4/25
Typical application schematics
Figure 1.
Table 3.
Components
Rpu1, Rpu2
Rpd1, Rpd2
C
C
C
Vin+
IN
Vin-
S
B
Typical application schematics for the TS4974
External component descriptions
P1
P2
Pair of pull-up (Rpu1, Rpu2) or pull down (Rpd1, Rpd2) resistors that are
connected to the digital volume control pins
See
Input coupling capacitors that block the DC voltage at the amplifier input
terminal. They form together with the amplifier’s differential input impedance
Z
(f
See
Supply bypass capacitor that provides power supply filtering.
See
Bypass pin capacitor that provides half supply filtering.
See
IN
cut-off
Cin1
330nF
Cin2
330nF
a first order high pass filter with a -3dB cut-off frequency
Section 4.9: Volume setting on page
Section 4.2: Low frequency response on page
Section 4.4: Decoupling of the circuit on page
Section 4.4: Decoupling of the circuit on page
Volume DOWN
Volume UP
= 1 / (2 x π x Z
Cb
1µF
1
2
3
TS4974 DFN10
U1
Vin-
Vin+
BYP ASS
S1
S2
DIGITAL VOLUME
VCC
CONTROL
IN
Rpu1
470k
STBY control
x C
BIAS
STBY
VCC
STBY
Functional description
IN
Rpu2
470k
)).
Rpd1
470k
Rpd1
470k
+
20.
VCC
UP/DVC and DOWN/DVC.
Vout+
Vout-
19.
19.
16.
Cs
1µF
9
8
Speaker
8 Ohms
TS4974