MAX1280EVKIT Просмотр технического описания (PDF) - Maxim Integrated
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MAX1280EVKIT Datasheet PDF : 7 Pages
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MAX1280 Evaluation Kit/Evaluation System
Measuring Supply Current
Power-supply current can be monitored by measuring
the voltage across resistor R9 (for VDD1) or R10
(VDD2). These resistors are 10Ω ±1%, so every 0.001V
across R9 represents 100µA of supply current.
Troubleshooting
Problem: No output measurement. System seems to
report zero voltage or fails to make a measurement.
1) Check VDD1 and VDD2 supply voltages.
2) Check the 2.5V reference voltage using a DVM.
3) Verify with an oscilloscope that the conversion-start
signal is being strobed.
4) Verify that SHDN is being driven high.
Problem: Measurements are erratic, unstable; poor
accuracy.
1) Check the reference voltage using a DVM.
2) Use an oscilloscope to check for noise. When prob-
ing for noise, keep the oscilloscope ground return
lead as short as possible, preferably less than 1/2in
(10mm).
VDD1
1
20
CHO
CHO
VDD1
R1
C1
C11
C12
R9
300Ω
0.01µF
0.1µF
10µF 10Ω
10V
1%
2
19
CH1
CH1
VDD2
R2
C2
C13
C14 R10
300Ω
0.01µF
0.1µF
10µF 10Ω
10V
1%
3
18
CH2
CH2
SCLK
TP1-6
R3
300Ω
C3
0.01µF
U1
J1-37
MAX1280
4
17
CH3
CH3
CS
TP1-5
R4
300Ω
C4
0.01µF
J1-31
J1-38
5
16
CH4
CH4
DIN
TP1-4
R5
300Ω
C5
0.01µF
J1-36
6
15
CH5
CH5
SSTRB
TP1-3
R6
300Ω
C6
0.01µF
J1-29
7
14
CH6
CH6
DOUT
TP1-2
R7
300Ω
C7
0.01µF
J1-35
8
13
CH7
CH7
GND
R8
C8
300Ω
0.01µF
O
1
JU1 2
9
COM
12
REFADJ
C10
0.01µF
REFADJ
SHDN
32 1
JU2
10
SHDN
VDD1
11
REF
REF
C9
4.7µF
10V
Figure 1. MAX1280 EV Kit Schematic
4 _______________________________________________________________________________________
J1-7
VDD1
VDD2
TP1-7
J1-8
TP1-1
GND
J1-1
J1-2
J1-3
J1-4
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