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參數(shù)資料
| 型號： | LM1872N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Radio Control Receiver/Decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP18 |
| 封裝： | PLASTIC, DIP-18 |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 371K |
| 代理商： | LM1872N |
Circuit Description
(Continued)
Thus either 3, 4, 5, or 6 channels are transmitted to repre-
sent the four possible codes that two digital channels repre-
sent. The receiver intrinsically counts channels with its de-
coder flip-flops by responding to the negative edges of the
demodulated RF waveform of which there is always one
more than the number of channels. The two LSBs of the
binary count are read, latched, and fed to the output drivers
which comprise digital channels A and B.
RECEIVER SECTION
The receiver circuit is a simple, single conversion design
with AGC which mixes down to 455 kHz and provides
58 dB of gain using the suggested transformers inFigure 5.
The active digital detector provides an additional 30 dB gain
over a silicon diode resulting in an overall system gain of
88 dB. More or less gain can be obtained by using different
transformers. The frequency range of operation extends
from 50 kHz to 72 MHz encompassing a wide range of allo-
cated frequency bands.
The short (1
ê
to 2
ê
) vertical whip antenna that is typically
used has a very low radiation resistance (0.5
X
to 4
X
) and
approximately 3 pF to 5 pF of capacitance. This antenna is
coupled to the mixer through a high Q tank consisting of C3
TL/H/7912–11
R1
D
Motor decoupling
R2
D
Sync timer; R2
e
SYNC
t’
s
470k
R3
D
Mixer decoupling
C1
D
LO bypass; optional
C2
D
LO tank; C2
e
43 pF
@
27 MHz
e
24 pF
@
49 MHz
Ant. input tank; C3
e
39 pF
@
27 MHz
e
24 pF
@
49 MHz
C3
D
C4
D
V
BIAS
bypass
Motor decoupling
C5
D
C6
D
Sync timer; C6
e
SYNC
t’
s
0.5
m
F
C7
D
Mixer decouple; 0.01
m
F
s
C7
s
0.1
m
F
C8
D
C9
D
IF bypass; optional
V
a
bypass; 0.01
m
F
s
C10
s
0.1
m
F
C10 D
C11 D
LO bypass
L1
D
LO coil
Toko
*
10k type (KXNA-4434 DZ) 9T; 0.8
m
H
@
27 MHz
Toko
*
10k type (KEN-4028 DZ) 6T; 0.4
m
H
@
49 MHz
L1 could be made a fixed coil, if desired.
T1
D
455 kHz mixer transformer
Toko
*
10 EZC type (RMC-202313 NO), Qu
e
110
Pin 1–2, 131T; pin 2–3, 33T
Pin 1–3, 164T; pin 4–6, 5T
T2
D
455 kHz IF transformer
Toko
*
10 EZC type (RMC-402503 NO), Qu
e
110
Pin 1–2, 98T; pin 2–3, 66T
Pin 1–3, 164T; pin 4–6, 8T
T3
D
Ant. input transformer
Toko
*
10k type (KXNA-4434 DZ), 3T sec. & 9T pri. of 0.8
m
H
@
27 MHz
Toko
*
10k type (KEN-4028 DZ), 1
(/2
T sec. & 6T pri. of 0.4
m
H
@
49 MHz
X1
D
3rd overtone parallel-mode crystal
D1
D
Electrostatic discharge (ESD) protection
*
Toko America
1250 Feehanville Drive
Mount Prospect, IL 60056
(312) 297-0070
FIGURE 5. Typical Application Circuit for 27 MHz or 49 MHz
7
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