AK2363 Datasheet, PDF (30/33 Pages) Asahi Kasei Microsystems – Radio Signaling LSI

ASAHI KASEI
[AK2363]
3) External DTMFIN capacitor
Connect a capacitor to the DTMFIN pin to adjust the DC offset of the input signal and the internal
operation point in the LSI device. This forms a high-pass filter with fc being about 3Hz.
18 DTMFIN
C
C=0.1m
LSI
4) Power supply stabilizing capacitors
Connect capacitors between the VDD and VSS pins to eliminate ripple and noise included in power
supply as shown below. For maximum effect, the capacitors should be placed at a shortest distance
between the pins.
6 VDD
VDD
C1
14 VSS
C2
VSS
C1=0.1mF (Ceramic cap)
C2=4.7mF (Electrolytic cap)
LSI
5) AGND stabilizing capacitor
It is recommended that a capacitor with 0.1mF be connected between VSS and the AGND pin to
stabilize the AGND signal. The capacitor should be placed as close to the pin as possible.
MS0583-E-01
21 AGND
C
LSI
- 30 -
C=0.1mF (Electrolytic cap)
2008/06