STEVAL-CCA003V1 STMicroelectronics, STEVAL-CCA003V1 Datasheet - Page 22

• 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

TS4984
4.5 Decoupling the circuit
Two capacitors are needed to correctly bypass the TS4984. A power supply bypass capacitor C
bias voltage bypass capacitor C
C
influence on power supply disturbances. With a value for C
performances to those shown in the datasheet. For example:
C
(with input grounded and in the lower frequency region), in the following manner:
Note that C
higher the PSRR.
4.6 Wake-up time, T
When the standby is released to put the device ON, the bypass capacitor C
immediately. As C
voltage is correct. The time to reach this voltage is called wake-up time or T
characteristics table with C
If C
value.
Due to process tolerances, the maximum value of wake-up time could be establish by the graph in
Figure
Note:
22/29
Figure 66: Typical wake-up time vs. C
S
b
has an influence on THD+N at lower frequencies, but its function is critical to the final result of PSRR
has particular influence on the THD+N in the high frequency region (above 7 kHz) and an indirect
b
In the high frequency region, if C
power supply rail are less filtered.
On the other hand, if C
filtered.
If C
If C
is substantial.
600
500
400
300
200
100
has a value other than 1 µF, please refer to the graph in
0
0.1
67.
b
b
Bypass capacitor C
refer to the previous graph (considering for example for C
Tamb=25 ° C
is higher than 1µF, the benefit on THD+N at lower frequencies is small, but the benefit to PSRR
is lower than 1µF, THD+N increases at lower frequencies and PSRR worsens.
in
has a non-negligible effect on PSRR at lower frequencies. The lower the value of C
1
Vcc=2.6V
Bypass Capacitor Cb ( F)
b
is directly linked to the bias of the amplifier, the bias will not work properly until the C
WU
2
b
as also a tolerance of typically +/-20%. To calculate the wake-up time with this tolerance,
b
S
= 1 µF.
Vcc=3.3V
is higher than 1 µF, those disturbances on the power supply rail are more
3
B
.
Vcc=5V
S
4
is lower than 1 µF, it increases THD+N and disturbances on the
b
4.7
Figure 67: Maximum wake-up time vs. C
600
500
400
300
200
100
b
0
0.1
= 1 µF in the range of 0.8 µF ≤ 1 µF ≤ 1.2 µF).
Tamb=25 ° C
S
of 1 µF, you can expect similar THD+N
Figure 66
1
Vcc=2.6V
Bypass Capacitor Cb ( F)
to establish the wake-up time
WU
2
Application Information
and specified in electrical
Vcc=3.3V
b
3
will not be charged
Vcc=5V
4
b
S
4.7
in
and a
, the
b