STEVAL-CCA019V1 STMicroelectronics, STEVAL-CCA019V1 Datasheet - Page 20

• 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

Application information
4.6
20/31
In this case we can consider that Rin equals Zin. So, for a desired cut-off frequency F
is calculated as follows:
The input impedance Zin is for the whole power supply voltage range, typically 30 kΩ . There
is also a tolerance around the typical value (see
account.
In the typical application, Cin =1
frequencies, it must be taken account that the speaker’s PSRR performance for the low
frequency region is decreased. The headphone PSRR remains the same.
Figure 41. PSRR vs. frequency
Gain settings
In the flat region of the frequency-response curve (no input coupling capacitor or internal
feedback loop + load effect) the gain of the loudspeaker amplifier can be set in four discrete
levels thanks to the two digital inputs G1 and G0.
The headphone amplifier gain does not depend on the loudspeaker gain setting and is kept
equal to 3.5 dB.
Table 13.
G1
0
0
1
1
Gain settings
G0
0
1
0
1
-100
-120
-20
-40
-60
-80
0
20
SPEAKER
V
R
Inputs AC grounded
CC
L
Doc ID 14527 Rev 2
≥
= PV
4
Ω ,
μ
Cb = 1
CCL,R
Cb = 1
F, then F
Cin
100
V
V
V
= 5V, Vripple = 200mV
V
V
μ
G1
IH
IH
IL
IL
F
μ
F, T
=
--------------------------------------- -
2π
AMB
Frequency (Hz)
CL
= 25
⋅
Cb = 100nF
= 5.3 Hz. If F
Zin
°
C, Gain = 9dB
Table 6 on page
1
⋅
1k
Cb = 220nF
PP
V
V
V
V
V
F
G0
IH
IH
IL
IL
CL
Cb = 470nF
CL
is required higher to limit low
amplifier gain
Loudspeaker
10k
7) and it must be taken into
(dB)
10.5
13.5
12
9
20k
amplifier gain
Headphone
(dB)
3.5
3.5
3.5
3.5
TS4982
CL
, C
in