TS4997 datasheet(28/34 Pages) STMICROELECTRONICS

Part #	TS4997

Description	2 x 1W differential input stereo audio amplifier with programmable 3D effects

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Application information

TS4997

28/34

Figure 67.

Typical single-ended input application

The component calculations remain the same for the gain. In single-ended input

configuration, the formula is:

with RIN expressed in kΩ.

4.14

Notes on PSRR measurement

What is the PSRR?

The PSRR is the power supply rejection ratio. The PSRR of a device is the ratio between a

power supply disturbance and the result on the output. In other words, the PSRR is the

ability of a device to minimize the impact of power supply disturbance to the output.

How is the PSRR measured?

The PSRR is measured as shown in Figure 68.

Cin1

330nF

1uF

BIAS

STBY

EFFECT

LEFT

RIGHT

LI N-

RIN-

LI N+

RIN+

Bypa ss

GND

LOUT-

LOUT+

ROUT-

ROUT+

Vcc

TS4997 - Q FN16

Cin2

330nF

Cin3

330nF

Cin4

330nF

VCC

Left Speaker

8 Ohms

Right Speaker

8 Ohms

Diff. input L-

Diff. input R-

Rin1

24k

Rin2

24k

Rin3

24k

Rin4

24k

SE =

O+

O-

–

--------------------------

feed

--------------

50k

--------------

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