CMX838 데이터 시트보기 (PDF) - CML Microsystems Plc
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CMX838 Datasheet PDF : 71 Pages
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FRS/PMR446/GMRS Family Radio Processor
3 External Components
CMX838
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
TXMOD2
20
U2
C13
C14
C15
RF
Section
19 VSS
SERIAL CLOCK
18
CMD DATA
17
16 RPLY DATA
15 IRQ
C-BUS
Serial
Control
Interface
R1 Note 1
R2 Note 1
R3 Note 2
R4 Note 3
C1
C2
C3 Note 1
C4 Note 1
C5 Note 2
C6
C7
C8
Figure 2: Recommended External Components
470kΩ
±5%
C9
10kΩ
±5%
C10
100kΩ ±10%
C11
±10%
C12
0.1µF
±20%
C13
0.1µF
±20%
C14
33pF
±20%
C15
0.1µF
±20%
C16
0.1µF
±20%
0.1µF
±20%
0.1µF
±20%
U2
0.1µF
±20%
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
47.0pF
Speaker driver
e.g. LM386
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
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. Minimum suggested
resistor value for R1 and R2 is 10kΩ.
2. R3 and C5 values are dependent on microphone specifications.
3. R4 Sets charge pump source current. See Section 4.3.3.
2003 CML Microsystems Plc
9
D/838/8
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