HA12181FP Datasheet, PDF (3/21 Pages) Hitachi Semiconductor – AM Radio Noise Reduction System

HA12181FP
Table of Pin Description and External Parts
External parts
Influence of External
parts
No.
of
pin Name
DC
voltage
(V) (No
Function input)
Equivalent circuit
Larger Smaller
than
than
recom- recom- recom-
mended mended mended
No.
value value
value
1 IF AGC Time 2.7
R500 100 K Longer Longer
constant
for IF
AGC.
C502 3.3 µ
1
R500
100k
C502
3.3µ
+
time to
stabilize
AGC.
distortion
of recover.
2 Bias1 Bypass 3.2
for
voltage
Stabi.
3 AF Input of 3.3
input AF.
2
C500
0.033µ
20k
C500 0.033 µ —
Increased
noise.
C513 1 µ
—
—
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
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.
0.068 µ Must be used on the
recommended value.
Rev.2, Jun. 1997, page 3 of 21