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| 型號(hào)： | CM8872CPEI-1 |
| 英文描述： | DTMF Receiver |
| 中文描述： | 雙音多頻接收器 |
| 文件頁(yè)數(shù)： | 8/9頁(yè) |
| 文件大小： | 76K |
| 代理商： | CM8872CPEI-1 |
200
1
California Micro Devices Corp. All rights reserved.
12
/
18
/2001
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
8
CM8870/70C
CALIFORNIA MICRO DEVICES
V
DD
V
DD
V
TST
V
DD
C
R
V
C
tGTA = (RC) In
St/GT
ESt
StD
V
DD
V
DD
–
V
TST
tGTP = (RC) In
Figure 4. Basic Steering Circuit
V
DD
V
DD
V
TST
tGTA = (R
P
C) In
R
P
= R
1
R
2
1 +
R
2
V
DD
V
DD
–
V
TST
tGTP = (R
1
C) In
(A.) Decreasing tGTA (tGTP > tGTA)
St/GT
ESt
C
R1
R2
V
DD
V
DD
V
TST
tGTA = (R
1
C) In
R
P
= R
1
R
2
1
+ R
2
VDD
V
DD
–
V
TST
tGTP = (R
P
C) In
(B.) Decreasing tGTP (tGTP < tGTA)
St/GT
ESt
C
R1
R2
Figure 5. Guard Time Adjustment
50
0
X Y
ABC D
FREQUENCY Hz
PRECISE DIAL TONES
X = 350Hz
y = 440Hz
DTMF TONES
A = 607Hz
B = 770Hz
C = 852Hz
D = 841Hz
A
1K
E F
G
H
2K
40
30
20
10
0
E = 1209Hz
F = 1336Hz
G = 1477Hz
H = 1633Hz
Figure 3. Typical Filter Characteristic
C1
+
–
R1
R2
R5
R3
IN+
IN
–
C2
R4
CM8870
C1 = C2 = 10nF
R1 = R4 = R4 =100 K
R2 = 60K
, R3 = 37.5K
All resistors are
–
1% tolerance.
All capacitors are
–
5% tolerance.
(Xxxx) = 2
R2 +
2
VOLTAGE GAIN (Av diff) =
IMPUT IMPEDANCE
R3 =
R2R5
R2 + R5
DIFFERENTIAL INPUT AMPLIFIER
V
REF
GS
R5
R1
1
wC
Figure 6. Differential Input Configuration
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| CM8872CPI | DTMF Receiver |
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| CM8872CS | DTMF Receiver |
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| CM8872CSI | DTMF Receiver |
相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| CM8872CPI | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:DTMF Receiver |
| CM8872CPI-1 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:DTMF Receiver |
| CM8872CS | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:DTMF Receiver |
| CM8872CS-1 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:DTMF Receiver |
| CM8872CSI | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:DTMF Receiver |
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