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TS4974 Datasheet(PDF) 4 Page - STMicroelectronics

Part # TS4974
Description  1W differential audio power amplifier with up/down digital volume control pins
PDF  25 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4974 Datasheet(HTML) 4 Page - STMicroelectronics

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



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