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LM1868 bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM1868
Giải thích chi tiết về linh kiện  Radio System
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1868 bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI)

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IC External Components (Application Circuit)
Component
Typical
Comments
Value
C1
100 pF
Removes tuner LO from IF input
C2
01 mF
Antenna coupling capacitor
C4 C5
001 mF
FM IF decoupling capacitors
C6 C9
0005 mF
AM smoothingFM de-emphasis
network de-emphasis pole is
R5
1k
(
given by
f1 j
1
2q (C6 a C9)
 R4 R6
R4 a R6
J
C10
10 mF
Regulator decoupling capacitor
C11
01 mF
Regulator decoupling capacitor
C12
10mF
AC coupling to volume control
C13
01 mF
Power supply decoupling
C14
50 mF
Power supply decoupling
C15
01 mF
Audio amplifier input coupling
R7
3k
Roll off signals from detector in
the AM band to prevent radiation
C16
0001 mF
(
C17
100 mF
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 mF
(
C7
10 mF
IF coupling
C8
01 mF
IF coupling
C20
01 mF
High frequency load for audio
amplifier required to stabilize
R10
5X
(
audio amplifier
C21
250 mF
Output coupling capacitor
R1
6k2
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
002 mF
Power supply decoupling
R11 R12
150X
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 50 pF min
FM 20 pF max 45 pF min
AM OSC 82 pF max 50 pF min
TOKO CY2-22124PT
Trimmers 5 pF
L1
640 mH Qu e 200
AM antenna
RP e 3k5
F e 796 kHz
1 mVmeter induces
(At secondary)
approximately 100 mV
open circuit at the secondary
L0 L2 360 mH QU l 80
Fe 796 kHz
TOKO RWO-6A5105 or
equivalent
Toko America
1250 Feehanville Drive
Mount Prospect IL 60056
(312) 297-0070
TLH7909 – 9
L4
SWG
20 N e 3
T inner
diameter e 5mm
L5
SWG
20 N e 3
T inner
diameter e 5mm
L6
L e 044 mH N e 4
T Qu e 70
L7
SWG
20 N e 2
T inner
diameter e 5mm
CF2
107 MHz ceramic filter
Murata
MURATA SFE 107 mA or
2200 Lake Park Drive
equivalent
Smyrna GA 30080
(404) 436-1300
T1
Qu l 70
107 MHz L to
resonate w82 pF
107 MHz
TOKO KAC-K2318 or equivalent
TLH7909 – 10
T2
Qu l 14
455 kHz L to
resonate w180 pF
455 kHz
TOKO 159GC-A3785 or
equivalent
TLH7909 – 11
CF1
TOKO CFU-090D or equivalent
BW l 48 kHz
455 kHz
TLH7909 – 12
T3
Apollo Electronics NS-107C
or equivalent
TLH7909 – 13
6


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