HA12181FP Просмотр технического описания (PDF) - Renesas Electronics

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Компоненты Описание

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HA12181FP

AM Radio Noise Reduction System

Renesas Electronics 

HA12181FP

Table of Pin Description and External Parts (cont.)

No.

of

pin

11

Name

Gate

Function

Gate

pulse

genera-

tion

DC

voltage

(V) (No

input)

4.5V

0

Equivalent circuit

11

External parts

No.

R503

C507

recom-

mended

value

180 K

2200 P

Influence of External

parts

Larger

than

recom-

Smaller

than

recom-

mended

value

mended

value

Gate

Gate

pulse

width

pulse

width

become

wider.

become

narrow.

12 Vth

Determi- 1.1

nation of

noise

detection

sensitivity

13

VCC

VCC

8.2

14 IF Det. IF AGC 3.3

detector

C507

2200p

R503

180k

12

R502

22k

—

R502

22 K

Higher

noise

detection

sensitivity.

Lower

noise

detection

sensitivity.

—

—

—

—

C503

0.01 µ —

—

15 AF

Time

0

AGC constant

for AF

AGC

16 IF in IF input 1.3

14

13

C503

0.01µ

15

C504

0.22µ

R505

47k

30k

16

C501

1000p

IF IN

R505

C504

47 K

0.22 µ

Longer

time to

stabilize

AGC.

Miss-

operation

in noise

detector.

IF Input

—

Coupling

Instability

Rev.2.00 Jun 15, 2005 page 5 of 19

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