TS4975EIJT STMicroelectronics, TS4975EIJT Datasheet - Page 29

• 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

TS4975
4.5
4.6
Output capacitor C
In single-ended mode the external output coupling capacitors C
capacitor C
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:
Decoupling of the circuit
Two capacitors are needed to properly bypass the TS4975 — a power supply capacitor C
a bias voltage bypass capacitor C
C
power supply disturbances.
With 1 F, you could expect similar THD+N performances like shown in the datasheet.
If C
rail are less filtered.
To the contrary, if C
filtered.
C
PSRR with input grounded in lower frequency:
The value of C
Power-on reset
When power is applied to V
(shutdown) until the supply voltage reaches its nominal value. The Power On Reset has a
typical threshold of 1.75V.
During this reset state the outputs configuration is the same like in the shutdown mode (see
Section 4.2: Output configuration on page 25
s
b
has a strong influence on the THD+N in high frequency (above 7kHz) and indirectly on the
has an influence on THD+N in lower frequency, but its value is critical on the final result of
s
Figure 54
If C
upwards.
If C
small.
is lower than 1 F, THD+N increases in high frequency and disturbances on power supply
b
b
is lower than 1 F, THD+N increases at lower frequencies and the PSRR worsens
is higher than 1 F, the benefit on THD+N and PSRR in the lower frequency range is
out
with the output load RL also forms a first-order high-pass filter with -3 dB cut off
b
to establish the C
also has an influence on startup time.
s
is higher than 1 F, those disturbances an the power supply rail are more
out
CC
, an internal Power On Reset holds the TS4975 in a reset state
F
out
----------------------- -
2 Z
CL
b
.
value for a -3dB cut-off frequency required.
1
in
=
C
------------------------- - Hz
2 R
in
1
L
------------------------- -
2 R
C
).
out
1
L
C
out
out
are needed. This coupling
Application Information
s
29/36
and