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HA12181FP

AM Radio Noise Reduction System

Renesas Electronics 

HA12181FP

Table of Pin Description and External Parts

No.

of

pin Name

1

IF AGC

Function

Time

constant

for IF

AGC.

DC

voltage

(V) (No

input)

2.7

External parts

Equivalent circuit

No.

R500

C502

1

R500

100k

C502

3.3µ

+

recom-

mended

value

100 K

3.3 µ

Influence of External

parts

Larger

than

Smaller

than

recom- recom-

mended

value

mended

value

Longer

Longer

time to

distortion

stabilize of

AGC.

recover.

2

Bias1 Bypass 3.2

for

voltage

Stabi.

3

AF input Input of 3.3

AF.

2

C500

0.033µ

20k

C500

0.033 µ —

C513

1µ

—

Increased

noise.

—

4

Bias2 Decide 1.3

the

current of

filter

network.

5

Phase Phase

3.3

circuit

AF IN

3

+

C513

4

5

C512

0.068µ

R506

C512

12 K

0.068 µ

Cut off

Cut off

frequency frequency

of L·P·F of L·P·F

and H·P·F and H·P·F

shifted

shifted

lower.

higher.

Must be used on the

recommended value.

Rev.2.00 Jun 15, 2005 page 3 of 19

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