E
MAX1168 Evaluation Kit/Evaluation System
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Detailed Description of Hardware
MAX1168 EV System
The MAX1168 EV system is a complete 8-channel, 16-
bit data-acquisition system consisting of a MAX1168 EV
kit and a Maxim 68HC16MODULE-DIP μC module. The
MAX1168 EV system is used to evaluate the MAX1168
8-channel, 16-bit serial ADC. See the
Quick Start
sec-
tion for setup and operating instructions. See Table 1 for
more information on the provided Windows software.
MAX1168 EV Kit
The MAX1168 EV kit board provides a proven layout for
evaluating the MAX1168 8-channel, 16-bit ADC and can
be obtained separately without the μC module for use
with an existing μC. The MAX1168 EV kit contains two
different types of buffers. U2 is a logic buffer to limit the
load capacitance that is seen by the DOUT line of the
MAX1168. U3
–
U10 are 16-bit accurate analog buffers
connected in the unity-gain configuration. U1 is powered
from V
DD
and U3
–
U10 are powered from V
DD
and V
EE
.
U3 is powered from the μC module (J1-7, J1-8). A termi-
nal block (TB0) has also been provided on the MAX1168
EV kit board for evaluating external reference mode.
Refer to the MAX1167/MAX1168 or MAX1067/ MAX1068
data sheets to ensure all interface timing specifications
are met.
The MAX1168 and MAX1168 EV kit board support DSP
and 16-bit-wide data-transfer mode. Jumpers JU1 and
JU2 can be configured for these modes; however, the
supplied EV kit Windows-compatible software does not
support these two modes. Please refer to the
MAX1167/MAX1168 or MAX1067/MAX1068 data sheets
for more information.
Table 1. Software Control Descriptions (continued)
CONTROL
DESCRIPTION
The
Se Vr e
b utton al ow s the user to sp eci y the actual r efer ence vol ag e. The eval uati on softw ar e
assum es a + 4.096V r efer ence vol ag e, unl ess other w se sp eci i ed To over d e the d efaul + 4.096V softw ar e
r efer ence val ue, m easur e the actual r efer ence vol ag e at the ter m nal b ock ( TB0) on the M AX 1168 E V ki
b oar d and enter the new r efer ence vol ag e, w hout the vol uni . Fi nal y, p ess the
Se Vr e
b utton. The E V ki
softw ar e uses the val ue typ ed i n the V ef fi el d to tr ansl ate the d g al cod e to a vol ag e.
Pressing the
Read ADC
button performs the conversion(s) specified by the control byte and reads back
the result(s).
Checking the
AutoRead
checkbox performs the conversion(s) specified by the control byte and reads
back the result(s) every 500ms. A blinking asterisk indicates AutoRead is active.
The
Exit
button closes the program
Table 2. DSP Frame Sync Receive Input
(DSPR)
JUMPER
SHUNT
POSITION
DESCRIPTION
ON*
DSP mode disable
JU1
OFF
DSP mode enable (the supplied
Windows software does not
support this mode)
Table 3. Data Bit Transfer Select Input
(DSEL)
JUMPER
SHUNT
POSITION
DESCRIPTION
1
–
2
16-bit-wide data-transfer mode
(the supplied Windows software
does not support this mode)
JU2
2
–
3*
8-bit-wide data-transfer mode
Caution: Do not connect an external controller to
the DSEL pad while a shunt is on jumper JU2.
*
Default configuration.
*
Default configuration.