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參數(shù)資料
| 型號： | AN7259 |
| 廠商： | Panasonic Corporation |
| 英文描述： | 5 AMP MINIATURE POWER RELAY |
| 中文描述： | 調(diào)頻收音機中頻放大器電路的汽車 |
| 文件頁數(shù)： | 5/5頁 |
| 文件大?。?/td> | 72K |
| 代理商： | AN7259 |
ICs for FM/AM Tuner
AN7259S
Detection Block
Pin11 and Pin12 constitutes a phase-shifting circuit of the QUAD detector
by external circuit.The R
7
is a coil damp resistor, and it exerts influences on
the noise, THD, and output level.
Its recommended value is 1.2k
~ 1.8k
.
Pin9 is the AFC voltage output pin,and according to the value of R
10
, the
band width of the Pin4 search output can be adjusted.
Pin13 is the center frequency adjusting pin of the Pin4 search output, and
makes it possible to adjust the center frequency of the search output
independently of the coil.
Reference Voltage
(V
REF
)
The reference voltage (3.9V) is output from Pin14. Remember to bypass
it by an external capacitor since this line is used as the power supply line to
the limiter.
IF Counter Output SSC
Pin16 is the IF counter output pin, and the output of about 300mV
P– P
is
obtainable on this pin. Because of its high gain, the IF counter output line is
separated on the pattern from the Pin20 (IF input) line in order to avoid
oscillation trouble.
Pin15 is the SSC pin to stop the IF counter, and according to the
V
SSC
level, the IF counter operation changes as shown in the table be-
low. The H level must be 4.2V or higher, and the L level must be 1V
or lower. SSC is used for prevention of the bad influences of the IF
counter output on the other blocks in the receiving mode.
IF Input Block
Pin20 is the IF input pin, and the input impedance is set between this pin
and Pin17 by R
1
. Usually a resistor of 330
is used as R
1
to secure
optimum matching with CF.
Pin17 and Pin18 are the internal DC feedback pins, and the high
frequency components are bypassed through C
1
and C
2
.
Pin19 is the GND pin dedicated to the limiter, and each GND of CF, C
2
and C
1
must be set close to Pin19. Externally short the GND of Pin19 with the GND
of Pin8.
30k
30k
CF
IF in
0.022
μ
F
C
2
C
1
0.022
μ
F
R
1
330
17
18
19
20
IF counter
V
SSC
ON
H
STOP
L
15
16
V
REF
20k
200k
200k
R
2
R
3
C
3
200pF
IF counter output
SSC IN (from microcomputer)
In case of channel selection by IF counter output
In case of channel selection by search output
Adjust the coil so that the V (9, 14) at V
in
= 0dB
μ
becomes
equal to V (9, 14) at V
in
= 100dB
μ
.
Same as above. Thereafter,adjust the center frequency of
the search output by the Pin13 VR.
V (9, 14) ··· DC voltage between Pin9 and Pin14
V
in
··· Level of IF input Pin20
*
An Example of Coil Adjusting Method
R
10
R
9
–
+
19
14
8
V
REF
Limiter
V
CC
10
13
14
V
CC
V
CC
43k
2
VR
200k
30k
15pF
R
8
820
C
11
R
7
1.2
k
C
8
C
9
C
7
0.2
μ
A
9
11
12
V
REF
R
10
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