STEVAL-CCA019V1 STMicroelectronics, STEVAL-CCA019V1 Datasheet - Page 23

• Manufacturer Part Number: STEVAL-CCA019V1
• Description: BOARD EVAL AUDIO AMP FOR TS4982
• Manufacturer: STMicroelectronics

Specifications of STEVAL-CCA019V1

• Amplifier Type: Class AB
• Output Type: 2-Channel (Stereo) with Stereo Headphones
• Max Output Power X Channels @ Load: 2W x 2 @ 4 Ohm; 125mW x 2 @ 16 Ohm
• Voltage - Supply: 5.0V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS4982
• Description/function: Audio Amplifiers
• Operating Supply Voltage: 5 V
• Output Power: 2 W
• Product: Audio Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4982
• Other names: 497-10339

TS4982
4.8.2
4.9
Charge pump capacitors Cp and Cps
A proper selection of the charge pump capacitors Cp and Cps is necessary to generate an
efficient negative voltage by the internal charge pump without a negative impact on the
audio performance.
The following are some recommendations for the decoupling and charge pump capacitors.
●
●
●
●
●
Wake-up time
When the standby is released to turn the device ON, the bypass capacitor Cb is charged
immediately. As Cb is directly linked to the bias of the loudspeaker amplifier, the bias will not
work properly until the Cb voltage is correct. The time to reach this voltage plus a time delay
of 1 ms (pop precaution) is called the wake-up time or t
characteristics with Cb = 1 µF in
If Cb has a value other than 1 µF, you can calculate the typical t
formula, or read it directly from the graph
Figure 44. Typical wake-up time vs. bypass capacitor
If the headphone (speaker) is already out of the standby mode and the speaker
(headphone) is enabled there is no need to charge Cb. Therefore, the wake-up time is only
the pop precaution delay of 1 ms (typical).
Low ESR capacitors are needed to minimize the output resistance of the charge pump.
An X7R dielectric type for large temperature ranges should be used.
Placement of the component as close to the package pins as possible. Small packages
(for instance SMD 0603, 0402) make it easier.
Use of a 10 V DC rating voltage for 5 V operation or 6.3 V DC rating operation for 3 V
operation with regard to the ΔC/ΔV variation of this type of dielectric.
For a typical application a 1 μF ceramic capacitor is recommended (see
page
5).
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
0
T
t
AMB
Doc ID 14527 Rev 2
WU
=25°C
Table 7 on page
s [ ]
1
=
5199
(Figure
2
⋅
Cb (
Cb
μ
44).
7.
+
F)
0.001[F]
3
WU
. It is specified in the electrical
4
WU
Application information
by using the following
5
Figure 1 on
23/31