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參數(shù)資料
| 型號(hào)： | LM1863M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 接收器 |
| 英文描述： | AM Radio System for Electronically Tuned Radios |
| 中文描述： | AM, AUDIO SINGLE CHIP RECEIVER, PDSO20 |
| 封裝： | PLASTIC, SOP-20 |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 268K |
| 代理商： | LM1863M |
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IC External Components
(See Application Circuit)
Component
Typical Value
Comments
C1
2.2
m
F
Sets dominant AGC pole, affects stop time
and THD.
C2
1
m
F
Sets non-dominant AGC pole, affects stop
time and THD.
C3
0.33
m
F
Stop level threshold decoupling, affects
stop time and sensitivity of stop detector to
large modulation peaks.
C4
10
m
F
Supply decoupling, low frequency.
C5
0.1
m
F
Supply decoupling, high frequency.
C6
1
m
F
IF decouple, affects IF gain.
C7
0.005
m
F
Audio output filter, removes IF ripple from
detector.
C8
10
m
F
Regulator decouple, low frequency.
C9
0.1
m
F
Regulator decouple, high frequency.
C10
470 pF
Pad capacitor for varactor, affects tracking.
C11
2
m
F
RF AGC decouple, affects stop time and
THD.
C12
0.33
m
F
RF AGC high frequency decouple.
C14
0.1
m
F
Local oscillator output coupling.
C19
0.001
m
F
Sets gain at high end of AM band.
C26
0.005
m
F
Sets gain at low end of AM band.
C28
0.01
m
F
Couples RF stage output to mixer input,
keep small to insure proper stop time
performance when RF AGC is active.
R1
300k Pot.
Sets level stop threshold.
R2
12k
Sets size of stop window.
R3
50k
Open collector pull up resistor.
R4
1k3
IF filter termination, and gain set.
R5
10k
Sets RC time constant on audio outputs,
smaller values may cause distortion of high
frequencies.
R6
200k
Sets gain of IF stage, affects noise floor and
sensitivity.
R7
Meter Dependent
Sets full-scale deflection of meter.
R8
100k
Sets gain and threshold of RF AGC.
R9
100
X
Aids mixer output decoupling.
R19
10k
Sets 2‘nd pole in RF AGC, affects THD for
large input signals.
R21
1.2 M
X
Biases pin 5 to 0.4 volts which permits
shorter stop time.
R24
820
X
Sets system gain.
D1, D2, D3,
TOKO
KV1235Z or
Equivalent
Varactor diodes.
Resonator
450 kHz
g
1 kHz
Murata
*
, BFU450C4N
Murata
*
CFU450F5
Parallel type resonator.
IF filter
Sets selectivity and tone response.
*
Murata
2200 Lake Park Drive
Smyrna, GA 30080
(404) 436-1300
6
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