AK2400 Datasheet, PDF (47/52 Pages) Asahi Kasei Microsystems – High integrated receiver for PMR-LMR

7) Discriminator
20 PDOUT R1
C1
R2
21 DISCOUT
C1=1000pF
R1=220k
R2=1M
8) Tripler circuit
LSI
Figure 34 Discriminator
9 TRIOUT
C3
C2
C1
L1 C4
L2
[AK2400]
8 LO2NDIN
C5
2nd LO_INPUT
C1=56pF,C2=470pF,C4=51pF,L1=L2=220nH for 45.9MHz
LSI
C1=43pF,C2=390pF,C4=43pF,L1=L2=220nH for 50.4MHz
C1=30pF,C2=270pF,C4=33pF,L1=L2=220nH for 57.6MHz
C3=3pF
C5=100pF
Figure 35 Tripler circuit
9) VREFA output
It is recommended that capacitors with 220nF or lager be connected between AVSS and VREFA
pin to stabilize the VREFA signal. The capacitors must be placed as close to the pins as possible.
16 VREFA
LSI
C1
AVSS
C1=220nF
Figure 36 VREFA
014008989-E-01
47
2015/4