HA12181FP
HA12181FP is AM Radio Noise Reduction manufactured by Hitachi Semiconductor.
Features
- High noise cancelling capacity: 46 d B typ.
- Less gain loss: GV =
- 0.5 d B typ.
- Low total harmonic destortion and high signal-to noise ratio: THD = 0.06% typ., S/N = 75 d B typ.
- Operation supply voltage range: 7.0 V to 10 V (8.2 V typ.)
- Less external parts count
Block Diagram
R500 100 k IF AGC
+ C502 0.01µ 3.3µ Det. 1 14
C503 C504 0.22µ R502 22 k
12 15
R505 47 k AF AGC
Rev.2, Jun. 1997, page 2 of 21 IF AGC OR HPF1 LPF Pulse Det.(2)
(1) (2) 13
IF Input
Pulse Det.(1)
Gate pulse Gen.
IF Amp. LPF Det. Pulse Det. HPF AF Amp. AF AGC Noise AGC Stabi. Volt.
2nd IFT
SW2
SW1
1st IFT
C501 1000 p
VCC (8.2 V)
+
R506 12 k
SW4
Gate pulse (1) Gate pulse (2)
Phase Circuit
SW3
AF Input
Hight-pass Amp. (waveform pensation)
Det.
+...
