TS4956 datasheet(44/51 Pages) STMICROELECTRONICS

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TS4956

Application information

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4.8

Notes on PSRR measurements

4.8.1

What is 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.

4.8.2

How we measure the PSRR?

The PSRR was measured with the TS4956 in the configuration shown in the schematic in

Figure 132

Figure 132. Configuration schematic of TS4956 for PSRR measurement

Main operating principles of TS4956 for purposes of PSRR measurement:

●

The DC voltage supply (VCC) is fixed

●

The AC sinusoidal ripple voltage (Vripple) is fixed

●

No bypass capacitor Cs is used

The PSRR value for each frequency is calculated as:

RMS is a rms selective measurement.

Bias

control

Select

I2C

Mode

TS4956

LHP

MLO

PHG

RHP

LHP Amplifier

Speaker Amplifier

RHP Amplifier

PHG Amplifier

I2CVCC

BYPASS

Digital volume

SRP+

SRN-

MLO Amplifier

Stereo

Input Left

Input Right

LIN

RIN

Stereo

Input Left

Input Right

MIP

MIN

1µF

16 Ohms

Cout

220µF

I2CVCC

SCL

SDA

Cin1

330nF

Cin2

330nF

Diff. input +

Diff. input -

I2C BUS

Cin3

330nF

Cin4

330nF

SE input left

SE input right

8 Ohms

16 Ohms

8 Ohms

MODE7

10 Ohms

Vripple

Vcc

PSRR

20Log

RMS

Out put

()

RMS

Vripple

()

---------------------------------- dB

()

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