sta538 STMicroelectronics, sta538 Datasheet - Page 24

• Manufacturer Part Number: sta538
• Description: 2 X 1.3 W Class-d Amplifier With Analog Or Digital Input 2.0 Multichannel Digital Audio Processor With Ffx
• Manufacturer: STMicroelectronics

ADC
6.1.2
6.1.3
6.2
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Application scheme
High-pass filter characteristics
Table 16.
Programmable gain amplifier
The programmable gain amplifier (PGA) is available in mic-in mode only. It is possible to
amplify the input signal from 0 to 42 db in steps of 6 db. The setting is done through PGA
bits of the ADCCFG register (see
See
Figure 6
Figure 6.
Frequency response:
Phase deviation at 20 Hz
Passband ripple
3 V, 3 A supply
VSSA
-3 dB
-0.08 dB
Table 11 on page 15
AC coupled
DC coupled
AC coupled
DC coupled
shows the filter circuit.
Parameter
High-pass filter characteristics
Block diagram
VSSA
R1
C5
C6
C7
C8
for performance values.
ADCCFG on page 50
C1
C2
C3
C4
C9
C0
Typical
19.35
0.08
50
7
INL
INR
AVDD
AGND
VHI
VLO
VCM
VBIAS
for details).
C1, C2, C3, C4 = 10 nF
(These capacitors must be
placed very close to their
respective pins)
C5, C6, C7 = 33 µF
(Low ESR and ESL
capacitors are
recommended)
VSSA plane must be
different from other
ground plane
3 V, 3 A must be a
low-noise supply and
separate from
other supplies
R1 = 500
C8 = 10 µF
C9, C0 = 1 µF
degree
Unit
Hz
Hz
dB
Ω
STA538