TS4975EIJT STMicroelectronics, TS4975EIJT Datasheet - Page 30

• Manufacturer Part Number: TS4975EIJT
• Description: IC AMP AUDIO .04W AB 12FLIPCHIP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4975EIJT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 40mW x 2 @ 16 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: Depop, I²C, Standby, Thermal Protection, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 12-FlipChip
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5199-2; TS4975EIJT

Application Information
4.7
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Notes on PSRR measurement
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.
How we measure the PSRR?
The PSRR was measured according to the schematic shown in
Figure 62. PSRR measurement schematic
Principles of operation
The PSRR value for each frequency is calculated as:
RMS is a rms selective measurement.
The DC voltage supply (V
The AC sinusoidal ripple voltage (V
No bypasss capacitor C
PSRR
s
is used
CC
=
) is fixed
20Log
ripple
RMS
--------------------------------- dB
RMS
) is fixed
Out put
V
ripple
Figure 62
.
TS4975