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參數(shù)資料
| 型號： | MC2800 |
| 廠商： | Motorola, Inc. |
| 英文描述： | FSK FM IF Receiver(FSK FM IF 接收器) |
| 中文描述： | FSK信號調(diào)頻（FSK信號調(diào)頻中頻接收器中頻接收機） |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 473K |
| 代理商： | MC2800 |
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MC2800
8
MOTOROLA RF/IF DEVICE DATA
PIN FUNCTION DESCRIPTION
(continued)
Pin
Description
Schematic (Excluding ESD)
Symbol
10
PH Cont
VCC
10
PH Cont
4.7
μ
F
Quick
Charge
This Phase Detector Control pin is connected
to a 4.7
μ
F capacitor. It is precharged to 0.9 V
during initial start–up (when the CTL signal is
high).
11
Lim Op
11
Lim Op
VCC
1.0 k
20 k
IF Amp/Limiter Output (small signal 5.0 mVpp
typical).
(For test purpose only.)
12
VDD
VDD
12
1.0
μ
F
100 pF
Digital Power Supply.
VDD can be greater or equal to VCC.
13
Bias Ref
Bias Ref
13
7.5 k
VCC
25
Regulator
A 7.5 k resistor is connected to this pin for bias
the reference of the gyrator filter included in
the demodulator block.
14
RSSI
VCC
50 k
100
14
RSSI
Receive Signal Strength Indicator.
It should be decoupled with a small capacitor.
15
IF2 In
VCC
1.5
k
15
IF2 In
Signal input for second IF Amplifier/Limiter.
16
Vref 0.9 V
VCC
16
Vref
4.7
μ
F
R1
R2
Band Gap
Regulator
0.9 V reference for internal use only. Minimum
4.7
μ
F capacitor required for decoupling. Not
recommended for external use.
(Do not draw current from it.)
NOTE:
Care in PCB layout should be taken to avoid compromising of sensitivity performance.
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