DB829 Datasheet, PDF (5/29 Pages) CML Microcircuits – Low Voltage Operation

Baseband Signal Processor
5
3. External Components
MX829 PRELIMINARY INFORMATION
XTAL
X1 _C1
R1
C2
XTAL/CLOCK
V_DD
C7
V_DD
XTAL ₁
24 ^VDD
XTAL/CLOCK ₂
23 ^MOD2
SERIAL CLOCK ₃
22 ^MOD1
"C-BUS" ^R7
INTERFACE
COMMAND DATA
REPLY DATA
CS
IRQ
CARRIER DETECT
4
21 ^{AUDIO OUT}
5
20 ^{VOL IN}
6
7
8
MX829 ¹⁹
18
17
MOD1 IN
SUM OUT
SUM IN
C3
R4
CD CAP
V_BIAS
9
10
16 ^{MSK/DTMF OUT}
R2
15 ^{FILTER OUT}
R3
C5
C4
MIC
C9 _VSS
11
12
Mic
14 ^{DEMOD FB}
13 ^{DEMOD IN}
R5
C6
Input
R6
C8
Input from
Demodulator
Figure 2: Recommended External Components
C1
22pF ±20%
C2
22pF ±20%
C3
68pF ±20%
C4
0.1µF ±20%
C5
0.1µF ±10%
C6
100pF ±20%
C7
0.1µF ±20%
C8 Note 2
±20%
C9
5.6nF ±20%
R1
R2 Note 1
R3 Note 1
R4
R5
R6 Note 2
R7
1MΩ
100kΩ
100kΩ
22kΩ
±5%
±10%
±10%
±10%
±10%
±10%
±10%
X1 Note 3 4.032MHz ±100ppm
External Component Notes:
1. R2, R3, R4 and C3 form the gain components for the Summing Amplifier (AMP2).
R2 and R3 should be chosen as required from the system specification, using the following formula:
Audio Gain = - ^R4
R3
DTMF Gain = - ^R4
R2
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