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HA12181FP

Hitachi Semiconductor
Part Number HA12181FP
Manufacturer Hitachi Semiconductor
Description AM Radio Noise Reduction
Published Mar 22, 2005
Detailed Description HA12181FP AM Radio Noise Reduction System ADE-207-171A (Z) 2nd. Edition June 1997 Functions • Buffer amp. for audio • L...
Datasheet PDF File HA12181FP PDF File

HA12181FP
HA12181FP

Overview
HA12181FP AM Radio Noise Reduction System ADE-207-171A (Z) 2nd.
Edition June 1997 Functions • Buffer amp.
for audio • Linear approximate circuit for noise reduction • IF Amp.
, detector, audio amp.
and AGC circuit for noise detection • Gate pulse generator Features • High noise cancelling capacity: 46 dB typ.
• Less gain loss: GV = –0.
5 dB typ.
• Low total harmonic destortion and high signal-to noise ratio: THD = 0.
06% typ.
, S/N = 75 dB typ.
• Operation supply voltage range: 7.
0 V to 10 V (8.
2 V typ.
) • Less external parts count HA12181FP 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 16 Pulse Det.
(1) Gate pulse Gen.
IF Amp.
LPF Det.
Pulse Det.
HPF AF Amp.
AF AGC Noise AGC Stabi.
Volt.
2nd IFT 4 ANT 7 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 compensation) RF MIX IF Det.
+ 3 Buffer Amp.
C506 100µ C513 1µ Stabilized Voltage Circuit 2 5 6 8 Level Diff.
Det.
Circuit Stabilized Current Circuit (waveform compensation) OSC SW5 AM-IC 10 9 11 C500 0.
033µ Capacitor for Pahse C512 0.
068µ Capacitor for Hold C511 0.
033µ AF Output Capacitor C509 + for By-pass R503 0.
033µ 180 k C508 C510 R504 0.
033µ Capacitor 1µ 4.
7 k for waveform compensation Gate Time Constant C507 2200 p Unit R:Ω C:F HA12181FP Table of Pin Description and External Parts External parts DC voltage (V) (No Function input) Equivalent circuit 2.
7 Influence of External parts Smaller than recommended value Longer distortion of recover.
No.
of pin Name 1 No.
R500 C502 Larger than recom- recommended mended value value 100 K 3.
3 µ Longer time to stabilize AGC.
IF AGC Time constant for IF AGC.
1 R500 100k C502 3.
3µ + 2 Bias1 Bypass for voltage Stabi.
Input of AF.
3.
2 2 C500 0.
033µ C500 0.
033 µ — Increased noise.
3 AF input 3.
...


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