TS4975EIJT STMicroelectronics, TS4975EIJT Datasheet - Page 31

• 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
4.8
4.9
Startup time
When the TS4975 is controlled to switch from full standby (output mode 0) to another output
mode, a delay is necessary to stabilize the DC bias.This length of this delay depends on the C
and V
This formula assumes that C
startup time will be always lower.
In
capacitor C
Figure 63. Typical startup time versus bypass capacitance
Pop and click performance
The TS4975 has internal pop and click reduction circuitry which eliminates the output
transients, for example during switch-on or switch-off phases, during a switch from an output
mode to another or during change in volume. The performance of this circuitry is closely linked
to the values of the input capacitor C
configuration) and the bias voltage bypass capacitor C
The value of C
value of C
The TS4975 is optimized to have a low pop and click in the typical schematic configuration (see
Figure 1 on page 3
During the device start-up period when the pop and click reduction is active, the value $Fxh
(1111xxxx binary) can be read from the internal device registry.
Once the device is fully operational and the pop and click is inactive, the last value of control
register can be read.
Figure 63
CC
values. A typical value can be calculated by following formula:
b
b
will affect the THD+N and PSRR values in lower frequencies.
.
you could easily establish typical startup time for given supply voltage and bypass
in
and C
400
350
300
250
200
150
100
and
50
0
out
Figure 2 on page 4
t
wu
0.4
is determined by the lower cut-off frequency value requested. The
=
b
C
voltage is equal to 0 V. If the C
0.8
b
------------------------ -
V
CC
in
1.2
V
Vcc=2.5V
, the output capacitor C
Bypass capacitor Cb ( F)
C C
–
1.2
1.6
).
50000
2.0
+
0.008 s
2.4
b
.
Vcc=5V
2.8
b
out
voltage is not equal 0 V, the
(for Single-Ended
3.2
Vcc=3.3V
Application Information
3.6
4.0
31/36
b