參數(shù)資料
型號(hào)： LM1868
廠商： National Semiconductor Corporation
英文描述： Radio System
中文描述： 無(wú)線電系統(tǒng)
文件頁(yè)數(shù)： 6/10頁(yè)
文件大?。?/td> 251K
代理商： LM1868
IC External Components
(Application Circuit)
given by.
Component
Typical
Comments
Value
C1
100 pF
Removes tuner LO from IF input
C2
0.1
m
F
0.01
m
F
0.005
m
F
1k
Antenna coupling capacitor
2
q
(C6
a
C9)
C4, C5
FM IF decoupling capacitors
C6, C9
AM smoothing/FM de-emphasis
network, de-emphasis pole is
R5
f1
j
1
R4
R6
R4
a
R6
J
C10
10
m
F
0.1
m
F
10
m
F
0.1
m
F
50
m
F
0.1
m
F
3k
Regulator decoupling capacitor
C11
Regulator decoupling capacitor
C12
AC coupling to volume control
C13
Power supply decoupling
C14
Power supply decoupling
C15
Audio amplifier input coupling
R7
Roll off signals from detector in
the AM band to prevent radiation
C16
C17
0.001
m
F
(
100
m
F
Power amplifier feedback
decoupling, sets low frequency
supply rejection
R8
16k
AM detector bias resistor
Component
Typical
Comments
Value
R9
240k
Set AGC time constant
C19
1
m
F
(
10
m
F
0.1
m
F
0.1
m
F
5
X
C7
IF coupling
C8
IF coupling
C20
High frequency load for audio
amplifier, required to stabilize
audio amplifier
R10
(
C21
250
m
F
6k2
Output coupling capacitor
R1
Sets Q of quadrature coil,
determining FM THD and
recovered audio
R2
12k
IF amplifier bias R
R3
5k6
Sets gain of AM IF and Q of AM
IF output tank
R4
10k
Detector load resistor
R6
50k
Volume control
C18
0.02
m
F
150
X
Power supply decoupling
R11, R12
Terminates the ceramic filter,
biases FM IF input stage
D1
1N4148
Optional. Quickens the AGC
response during turn on
Coil and Tuning Capacitor Specifications
C1
AM ANT 140 pF max 5.0 pF min
AM OSC 82 pF max 5.0 pF min
Trimmers 5 pF
FM 20 pF max 4.5 pF min
TOKO CY2-22124PT
L1
640
m
H, Q
u
e
200
R
P
e
3k5
@
F
e
796 kHz
(At secondary)
AM antenna
1 mV/meter induces
approximately 100
m
V
open circuit at the secondary
L0, L2 360
m
H, Q
U
l
80
@
F
e
796 kHz
TOKO RWO-6A5105 or
equivalent
Toko America
1250 Feehanville Drive
Mount Prospect, IL 60056
(312) 297-0070
TL/H/7909–9
L4
SWG
Y
20, N
e
3
(/2
T, inner
diameter
e
5 mm
SWG
Y
20, N
e
3
(/2
T, inner
diameter
e
5 mm
L
e
0.44
m
H, N
e
4
(/2
T, Qu
e
70
SWG
Y
20, N
e
2
(/2
T, inner
diameter
e
5 mm
L5
L6
L7
CF2
10.7 MHz ceramic filter
MURATA SFE 10.7 mA or
equivalent
Murata
2200 Lake Park Drive
Smyrna, GA 30080
(404) 436-1300
T1
Q
u
l
70
@
10.7 MHz, L to
resonate w/82 pF
@
10.7 MHz
TOKO KAC-K2318 or equivalent
TL/H/7909–10
T2
Q
u
l
14
@
455 kHz, L to
resonate w/180 pF
@
455 kHz
TOKO 159GC-A3785 or
equivalent
TL/H/7909–11
CF1
TOKO CFU-090D or equivalent
BW
l
4.8 kHz
@
455 kHz
TL/H/7909–12
T3
Apollo Electronics NS-107C
or equivalent
TL/H/7909–13
6
相關(guān)PDF資料
PDF描述
LM1868N Radio System
LM1870 STEREO DEMODULATOR WITH BLEND
LM1871 RC Encoder/Transmitter
LM1871N RC Encoder/Transmitter
LM1872 Radio Control Receiver/Decoder
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM1868N 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Radio System
LM1868N/A+ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AM/FM Receiver Circuit
LM1868N/B+ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AM/FM Receiver Circuit
LM1870 制造商:NSC 制造商全稱:National Semiconductor 功能描述:STEREO DEMODULATOR WITH BLEND
LM1870M 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FM Receiver Circuit
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