AK2400 Datasheet, PDF (45/52 Pages) Asahi Kasei Microsystems – High integrated receiver for PMR-LMR

[AK2400]
Typical Evaluation Board Schematic (2nd IF)
1) Power supply stabilizing capacitors
Connect capacitors between VDD and VSS pins to eliminate ripple and noise included in power supply.
For maximum effect, the capacitors should be placed at a shortest distance between the pins.
41 DVDD
C1 C2 C3
C1=100pF
C2=0.1F
C3=10F (Electrolytic cap)
15 AVDD
C1 C2 C3
Figure 28 DVDD, AVDD
2) AGND stabilizing capacitors
It is recommended that capacitors with 1μF or lager be connected between VSS and the AGND and
AGNDIN pins to stabilize the AGND signal. The capacitors must be placed as close to the pins as
possible.
18 AGNDIN
3) BIAS4 pin
17 ^AGNDOUT
C
AVSS
C
AVSS
C=1F (Electrolytic capacitor)
LSI
Figure 29 AGNDIN, AGNDOUT
19 4
R1
AVSS
LSI
Figure 30 BIAS4
R1=47k1%
014008989-E-01
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2015/4