DEMOTS4956J STMicroelectronics, DEMOTS4956J Datasheet - Page 44

• 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
4.4
4.4.1
Note:
4.4.2
Low frequency response
Input capacitor C
The input coupling capacitor blocks the DC part of the input signal at the amplifier input. In
the low-frequency region, C
pass filter with -3 dB cut-off frequency.
Z
For all inputs, the impedance value remains constant for all gain settings. This means that
the lower cut-off frequency does not change with the gain setting. Note also that 30 k
typical value and there is tolerance around this value. Using
establish the C
Figure 127. 3dB lower cutoff frequency vs. input capacitance
Output capacitor C
In the single-ended configuration an external output coupling capacitor, C
This coupling capacitor C
filter with -3 dB cut off frequency.
See
These two first-order filters form a second-order high-pass filter. The -3 dB cut-off frequency
of these two filters should be the same, so the following formula should be respected:
in
is the input impedance of the corresponding input.
Figure 128
in
to establish the C
value required for a -3 dB cut-off frequency.
in
out
100
out
10
0.1
in
, together with the output load R
starts to have an effect. C
Typical Input
Impedance
out
F
F
-----------------------
2πZ
CL
value for a -3 dB cut-off frequency required.
CL
Maximum Input
Impedance
1
Input Capacitor Cin (
in
=
=
C
----------------------- (Hz)
2πZ
------------------------- - Hz
2πR
in
≅
1
in
1
L
------------------------- -
2πR
C
C
in
out
1
L
(
C
out
Minimum Input
Impedance
μ
)
in
F)
All gain setting
Tamb=25
with Z
L
Figure 127
, forms a first-order high-pass
in
°
C
forms a first-order, high-
Application information
1
you can easily
out
, is needed.
Ω
44/55
is a