TS4973IJT(2003) Ver la hoja de datos (PDF) - STMicroelectronics

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TS4973IJT
(Rev.:2003)

1.2W TWO AUDIO INPUTS WITH GAIN CONTROL POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW

STMicroelectronics 

TS4973

Components

Functional Description

Rin

Cin1

Cin2

Cs

Cb

Gv

Inverting input resistor which sets the closed loop gain ( when GS = high) in conjunction with the inter-

nal feedback resistor Rfeed. This resistor also forms a high pass filter with Cin1

Fc = 1 / (2 x Pi x Rin x Cin1)

Input coupling capacitor which blocks the DC voltage at the amplifier input terminal In1

Input coupling capacitor which blocks the DC voltage at the amplifier input terminal In2. This capacitor

also forms a high pass filter with Zin (internal input impedance when Gs = Low

Fc = 1 / (2 x Pi x Zin x Cin2)

Supply Bypass capacitor which provides power supply filtering (Recommended value = 1µF)

Bypass pin capacitor which provides half supply filtering (Recommended value = 1µF)

Closed loop gain in BTL configuration

When Gs = Low, Gv = 2 or 6dB

When GS = high, Gv = 2 x (Rfeed / Rin). Rfeed value see Electrical Characteristics.

REMARKS

1. All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 1µF.

2. The standby response time is about 1µs.

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