CMX838 查看數據表（PDF） - MX-COM Inc
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CMX838 Datasheet PDF : 70 Pages
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FRS/PMR446/GMRS Family Radio Processor
10
3 External Components
CMX838 Advance Information
From RF Receiver
From Tone Generator
R3 C4
R1
Microphone
C5 R2
RF
Section
VCO
C7
REF
OSC
C1 RXIN 1
C2 AUX I/O 2
MICOUT
3
C3 MICIN 4
CPOUT
C16 ISET
5
6
R4
C6
SVDD 7
-RFIN 8
+RFIN 9
C8
SVSS 10
REFIN 11
XTAL 12
XTAL 13
CS 14
28 AOUT
C9
27 BOUT
VBIAS
26
25 AIN
C10
Optional
External
Audio
C11 Processing
24 BIN
C12
RXOUT
23
22 VDD
CMX838E1 TXMOD1
21
20 TXMOD2
U2
C13
C14
C15
RF
Section
19 VSS
SERIAL CLOCK
18
CMD DATA
17
RPLY DATA
16
15 IRQ
C-BUS
Serial
Control
Interface
Figure 2: Recommended External Components
R1 Note 1 470kΩ
±5%
C9
R2 Note 1
10kΩ
±5%
C10
R3 Note 2 100kΩ ±10%
C11
R4 Note 3
±10%
C12
C1
0.1µF ±20%
C13
C2
0.1µF ±20%
C14
C3 Note 1
33pF
±20%
C15
C4 Note 1 0.1µF ±20%
C16
C5 Note 2 0.1µF ±20%
C6
0.1µF ±20%
C7
0.1µF ±20%
U2
C8
0.1µF ±20%
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
47.0pF
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
Speaker driver
e.g. LM386
External Components Notes:
1. R1, R2, C3 and C4 form the gain components for the Tx Input Amplifier (microphone amplifier). R1
should be chosen as required by the signal level, using the following formula:
Gain = -R1/R2
C3 x R1 should be chosen so as not to compromise the high frequency performance and C4 x R2
should be chosen so as not to compromise the low frequency performance.
2. R3 and C5 values are dependent on microphone specifications.
3. R4 Sets charge pump source current. The value of R4 can vary between about 50kΩ and 250kΩ. This
gives a charge pump current range of 0.8mA to 8.4mA
¤2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480221.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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