AK2358F Datasheet, PDF (23/26 Pages) Asahi Kasei Microsystems – Base-band LSI for Europian Cordless Telephones(CTI, CTI+)

ASAHI KASEI
[AK2358FI
0AMP3
The smoothing filter to eliminate 448kHz clock component from EXPOUT signal is
provided by this amplifier. Also it works to adjust the receiving gain. Adding the
other pass signal may be possible. The following is one example of the 1st order low-pass
filter, which has OdB gain , 19kHz cut-off frequency.
EXPOUT
C2 RI
RXAFIN
c1
R2
Cl=150pF
C2=0 .022 pF
Rl=R2=56k Q
+@ + ^RXAF
AMP3 -
LSI
OAGNIl stabilizing capacitor
To stabilize the AGND potential, connect capacitors larger than 0.3KF between TACND
pin, RAGND pin and AVSS pin. Also between AGNDIN pin and AVSS pin some capacitor is
necessary to reduce the ripple of the power.
C-1 /iF
LSI
QVDD stabilizing capacitor
To reduce the noise on VDD, connect capacitors between VDD and VSS.
VDD
VDD
cl ⁺
C1-22,UF
(Aluminium Electrolytic Capacitor)
C2 ^{C2-O.l~F (Ceramic Capacitor)}
b Vss
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LSI
0152-E-00
22
1996 12