Evaluate: MAX1304–MAX1315
MAX1308 Evaluation Kit/Evaluation System
8 _______________________________________________________________________________________
General Troubleshooting
Problem 1: 68HC16MOD-16WIDE not found (see
Figure 5).
• Is LED1 on the 68HC16MOD-16WIDE lit?
• Is the power supply connected?
• Is SW1 turned to ON position?
• Is the DB9 serial-communications cable connected?
(if using the USBTO232, is the USB cable connected?)
• Could another application be using the COM port
(virtual COM port) (i.e., PDA software)?
Problem 2: Cannot read data from MAX1308 EV kit.
• Are JU5–JU12 set for buffered or unbuffered inputs?
• Are the buffer power supplies (HVAVCC and
HVAVEE) connected?
• Are the MAX1308 EV kit power supplies (AVDD and
DVDD) connected?
• Are JU4 and JU14 set for internal or external clock?
• Is the part in shutdown mode?
Problem 3: Data being read from the MAX1308 seems
incorrect.
• Are JU1 and JU13 set for bipolar or unipolar inputs?
• Is the reference voltage entered correctly in the
MAX1308 evaluation software?
• Is the midscale voltage entered correctly in the
MAX1308 evaluation software?
• Is the correct part selected in the MAX1308 evalua-
tion software?
• Is the source impedance less than 100Ω?
JUMPER
SHUNT
POSITION
DESCRIPTION
Short*
Channel X (where X is determined
by the jumper number minus 5)
input must appear on CHX-BUF
pads and is buffered using the
MAX4351.
JU5–JU12
Open
Channel X (where X is determined
by the jumper number minus 5)
input must appear on CHX pads
and is not buffered.
Table 5. Buffered Input Select
*Default configuration.
JUMPER
SHUNT
POSITION
DESCRIPTION
1-2
Midscale reference is set for
unipolar inputs.
JU13
2-3*
Midscale reference is set for
bipolar inputs.
Table 6. Midscale Reference Select
*Default configuration.
JUMPER
SHUNT
POSITION
DESCRIPTION
1-2*
Select internal clock as ADC
system clock.
JU14
2-3
Select external ECLK SMA as
ADC system clock.
Table 7. ADC System Clock Select
*Default configuration.
JUMPER
SHUNT
POSITION
DESCRIPTION
1-2 DVDD supplied from DVDD pad.
JU15
2-3*
DVDD connected to VCC supply
from 68HC16MOD-16WIDE.
Table 8. DVDD Select
*Default configuration.
JUMPER
SHUNT
POSITION
DESCRIPTION
1-2
Positive supply to input buffers
connected to AVDD.
2-3*
Positive supply to input buffers
connected to HVAVCC pad.
JU16
Open No positive supply to input buffers.
Table 9. Positive Supply for Input Buffers
(HVAVCC) Select
*Default configuration.
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