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參數(shù)資料
| 型號： | AN7259S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 調(diào)諧器 |
| 英文描述： | FM-IF Amplifier Circuit for Car Radio |
| 中文描述： | 1-BAND, AUDIO TUNER, PDSO20 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-20 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大小： | 72K |
| 代理商： | AN7259S |
AN7259S
ICs for FM/AM Tuner
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
AN7259S
+
+
+
+
330
0
μ
F
0
μ
F
0
μ
F
200k
2
IF COUNTER
OUT
REF
SSC
200k
820
15pF
1.2k
30kB
FROM
F.E.
0.22
μ
F
7.5k
1000pF
AF OUT
0.022
μ
F
V
CC
SEARCH
100k
0
μ
F
0
μ
F
2
10kB
2
μ
F
V
CONT.
OUT
Control Signal Output Block
The AN7259S has linear level meter output (control voltage on Pin2)
whose dynamic range is about 60dB wider for change of the input. This
control voltage is adjustable by the resistor R
4
of Pin1. The adjustable range
at R
4
= 0.8k
~ 10k
is more than 30dB in conversion of the input.
The polarity of the output voltage from Pin3 is reverse to that of the voltage
to be output from Pin2. This output from Pin3 requires insertion of a
capacitor (C
5
= 4.7
μ
F) since it is used for soft muting. The search output
(right sketch) to be used for channel selection is obtainable on Pin4. The
band width of this search output is adjustable. (Refer to Detection Block.)
The search stop sensitivity is externally adjustable because the L level
value varies with the input signal level.
Soft Mute
Pin7 is the AF output pin, and the emitter follower output of
≈
300
in
output impedance is obtainable on this pin.
Pin6 is the soft mute adjusting pin to adjust the attenuation at the non-input
mode.
Soft mute here denotes muting by the level signal output from Pin3, and
the soft mute response varies with the time constant of this voltage output.
The r
2
and C
12
are related to the weak input S/N and the soft mute ON time,
and with increase of the C
12
value, the weak input S/N is proportionately
improved, but the speed of response accordingly becomes lower. The r
1
, on
the other hand, is related to the soft mute OFF time. Each value specified in
the right sketch denotes a recommended value.
Control voltage output
1
2
3
4
10k
200
200
20k
R
6
Search output
C
6
C
5
C
4
R
5
R
4
0.22
μ
F
4.7
μ
F
1.8
k
0.022
μ
F
10kB
~ 20kB
Control voltage
Search output
Input
Increase of R
4
30dB
Frequency
3
5
6
7
8
V
REF
C
13
R
13
VR
AF
OUT
GND
To V
CC
C
12
+
4.7
μ
F
r
1
r
2
V
CC
200
36k
Soft mute
adj.
2k
I
Pin Descriptions
I
Application Circuit
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