STEVAL-CCA003V1 STMicroelectronics, STEVAL-CCA003V1 Datasheet - Page 23

• Manufacturer Part Number: STEVAL-CCA003V1
• Description: BOARD EVAL FOR LV TS4984IQT
• Manufacturer: STMicroelectronics

Specifications of STEVAL-CCA003V1

• Design Resources: STEVAL-CCA003V1 Gerber Files
• Amplifier Type: Class AB
• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 1W x 2 @ 8 Ohm
• Voltage - Supply: 2.2 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS4984
• Description/function: Audio Amplifiers
• Operating Supply Voltage: 2.2 V to 5.5 V
• Output Power: 1 W
• Product: Audio Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: TS4984
• Kit Application Type: Amplifier
• Application Sub Type: Stereo Audio Power Amplifier
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4984
• Other names: 497-6396; STEVAL-CCA003V1

Application Information
4.7 Shutdown time
When the standby command is set, the time required to put the two output stages in high impedance and
the internal circuitry in shutdown mode is a few microseconds.
Note:
4.8 Pop performance
Pop performance is intimately linked with the size of the input capacitor C
capacitor C
The size of C
is dependent on THD+N and PSRR values requested at lower frequencies.
Moreover, C
and click, the equivalent input constant time is:
must not reach the τ
Figure 68: τ
By following previous rules, the TS4984 can reach near zero pop and click even with high gains such as
20 dB.
Example calculation
With R
value which gives a lower cut-off frequency equal to 18.5 Hz. In this case, (R
When referring to the previous graph, if C
as high as our current value, thus we can state that pop and click will be reduced to its lowest value.
Minimizing both C
application.
in
In shutdown mode, Bypass pin and Vin- pin are short-circuited to ground by internal switches. This allows for
the quick discharge of the C
= 22 kΩ and a 20 Hz, -3 db low cut-off frequency, C
b
.
in
b
in
determines the speed with which the amplifier turns ON. In order to reach near zero pop
max. versus bypass capacitor
is dependent on the lower cut-off frequency and PSRR values requested. The size of C
in
in
and the gain benefits both the pop phenomena, and the cost and size of the
maximum value as indicated in the graph below in
160
120
80
40
0
Tamb=25
b
t
and C
in
= (Rin + 2 kΩ) x C
in
°
1
C
capacitors.
b
Vcc=2.6V
=1 µF and Vcc = 5 V, we read 20 ms max. This value is twice
Bypass Capacitor Cb ( F)
2
Vcc=3.3V
in
(s) with R
3
in
Vcc=5V
= 361 nF. So, C
in
≥
4
5 kΩ
Figure
in
and the bias voltage bypass
in
in
68.
+ 2 kΩ) x C
=390 nF with standard
in
= 9.36 ms.
TS4984
23/29
b