ASAHI KASEI
[AK2346B]
4) RXA2 Amplifier
This is an operational amplifier suitable for receive gain adjuster and smoothing filter to eliminate
461kHz sampling clock component included in EXPOUT pin. The following simplified schematic
shows an example of 1st order Low-pass filter that has 0dB gain and 19kHz cut-off frequency.
18 EXPOUT
C1
C1=0.022uF
R1
RXAFIN
19
C2=150pF
C2
R2
_
+
R1=R2=56kΩ
RXAF
20
RXA2
LSI
5) Power supply stabilizing capacitors
To connect capacitors between VDD and VSS pin reduce the ripple and noise included in power
supply. These capacitors are mounted close to the device pins.
VDD
17
VDD
C1=22uF (Electrolytic cap)
C2=0.1uF (Ceramic cap)
C2
C1
8
VSS
VSS
LSI
6) AGND, AGNDIN pin stabilizing
Please decouple to VSS level by the 0.3uF or larger capacitor. These capacitors are mounted
close to the device pins.
1
AGNDIN
AGND
C
2
C=1uF
C
LSI
MS1409-E-00
2012/05
- 27 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
