DEMOTS4956J STMicroelectronics, DEMOTS4956J Datasheet - Page 47

• Manufacturer Part Number: DEMOTS4956J
• Description: BOARD DEMO TS4956EIJT/EIKJT
• Manufacturer: STMicroelectronics

Specifications of DEMOTS4956J

• Amplifier Type: Class AB
• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1W x 1 @ 8 Ohm; 43mW x 2 @ 32 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS4956
• Description/function: Audio Amplifiers
• Operating Supply Voltage: 2.7 V to 5.5 V
• Product: Audio Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4956
• Other names: 497-6381; DEMOTS4956J

TS4956
4.8
4.8.1
4.8.2
PSRR measurements
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 is PSRR measured?
The PSRR was measured with the TS4956 configured as shown in
Figure 130. Configuration of TS4956 for PSRR measurement
Main operating principles of TS4956 for purposes of PSRR measurement
●
●
●
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 bypass capacitor C
A
B
C
D
E
F
10 Ohms
10 Ohms
10 Ohms
10 Ohms
Diff. input +
SE input left
SE input right
Cin1
330nF
Cin2
330nF
Diff. input -
Cin3
330nF
Cin4
330nF
+
+
+
+
A1
A2
B4
A5
s
MIP
MIN
LIN
RIN
TS4956
is used.
PSRR
CC
BYPASS
Input Right
Input Right
Cb
1µF
Input Left
Input Left
) is fixed.
Stereo
Stereo
Stereo
Stereo
Bias
=
I2C BUS
20Log
I2CVCC
SCL
SDA
I2CVCC
Vripple
Vcc
ripple
) is fixed.
Select
Mode
--------------------------------- - dB
RMS
RMS
I2C
(
(
Vripple
Output
LHP Amplifier
PHG Amplifier
RHP Amplifier
Speaker Amplifier
MLO Amplifier
Digital volume
control
)
)
SRP+
SRN-
MLO
PHG
RHP
LHP
(
)
B6
A7
D6
B2
D2
E7
Cout
220µF
Application information
+
Figure
MODE7
RL
16 Ohms
RL
16 Ohms
RL
8 Ohms
RL
16 Ohms
RL
8 Ohms
130.
A
B
C
D
E
F
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