參數(shù)資料
型號(hào)： RV2211N
廠商： Electronic Theatre Controls, Inc.
英文描述： FSK Demodulator/Tone Decoder
中文描述： FSK解調(diào)器/音頻解碼器
文件頁(yè)數(shù)： 8/16頁(yè)
文件大小： 135K
代理商： RV2211N
PRODUCT SPECIFICATION
RC2211
8
Design Examples
Tone detector with a detection band of 1 kHz
±
20 Hz:
Step 1: Choose R
0
= 20 k
W
(18 k
W
in series with 5 k
W
potentiometer) .
Step 2: Choose C
0
for F
0
= 1 kHz: C
0
= 0.05
m
F.
Step 3: Calculate R
1
: R
1
= (R
0
) (1000/20) = 1 M
W
.
Step 4: Calculate C
1
: for
z
= 1/2, C
1
= 0.25
m
F,
C
0
= 0.013
m
F.
Step 5: Calculate C
D
: C
D
= 16/38 = 0.42
m
F.
Step 6: Fine tune the center frequency with the 5 k
W
potentiometer. R
X
.
Linear FM Detection
The RC2211 can be used as a linear FM detector for a wide
range of analog communications and telemetry applications.
The recommended circuit connection for the application is
shown in Figure 5. The demodulated output is taken from the
loop phase detector output (pin 11), through a post detection
Tlter made up of R
F
and C
F
, and an external buffer ampliTer.
This buffer ampliTer is necessary because of the high
impedance output at pin 11. Normally, a non-inverting unity
gain op amp can be used as a buffer ampliTer, as shown in
Figure 5.
The FM detector gain, i.e., the output voltage change per unit
of FM deviation, can be given as:
V
OUT
= R
1
V
R
/100 R
0
Volts/% deviation
where V
R
is the internal reference voltage. For the choice of
external components R
1
, R
0
, C
0
, C
1
and C
F
, see the section
on Design Instructions.
Figure 5. Linear FM Detector
Using RC2211 and an External Op Amp
65-2211-08
(12)
(11)
R1
R
F
100K
R0
C1
C
F
+V
S
Demodulated
Ouput
(14)
(13)
(2)
FM
Input
CK
C
O
0.1
μ
F
0.1
μ
F
+V
S
0.1
μ
F
RC2211
(8)
(1)
(10)
(4)
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