Motorola MDH65SDC9AA2AN Service-informatie - Pagina 24
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IC Designator
U201
Freq Synthesizer
U251
VCO / Buffer
Pin
Pin Function
24
Ref osc XTAL2
25
Ref osc warp output
26
Superfilter cap
27
Superfilter base (NU)
28
Superfilter output
29
NC2
30
Superfilter input
31
NC3
32
Prescaler input
33
Prescaler ground
34
Prescaler Vdd
35
Prescaler Vref (NU)
36
Digital Vdd
37
TEST1 (NU)
38
TEST2 (NU)
39
Bias 2
40
Bias 1
41
Modulation output
42
CCOMP (NU)
43
Steering line IOUT
44
PD ground
45
Steering line IADAPT
46
Adapt switch (NU)
47
Voltage from charge pump
48
AUX1 output (NU)
1
TX VCO current adjust
2
RX VCO current adjust
3
Superfiltered input
4
Collector RF in amp
5
RX VCO base
6
RX VCO emitter
7
RX switch output (NU)
8
RX buffered VCO output
9
GND_FLAG
10
TX buffered VCO output
11
GND_BUFFERS
TROUBLESHOOTING TABLES
DC Voltage
Comments (Condition)
0
3.00
4.48
3.76
4.52
0
4.96
0
1.97
GND
2.99
1.97
2.99
0.01
0
3.38 (typ)
(1.34V in TX mode)
1.50 (typ)
(3.20V in TX mode)
3.42 (typ)
(1.62V typ in TX mode)
0.05
9.62 (typ)
Depends on frequency
GND
9.62 (typ)
Depends on frequency
0
12.8
2.98
4.50
4.35
4.51
4.35
1.27
0.48
0
3.36
GND
3.36
GND