MAX1156 Datasheet, PDF (11/15 Pages) Maxim Integrated Products – 14-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range

14-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
+5V
100kΩ
68kΩ
150kΩ
0.1µF
MAX1156
MAX1158
MAX1174
REFADJ
Figure 7. MAX1156/MAX1158/MAX1174 Reference Adjust
Circuit
OUTPUT CODE
11 1111 1111 1111
11 1111 1111 1110
11 1111 1111 1101
MAX1156
INPUT RANGE = 0 TO +10V
FULL-SCALE
TRANSITION
FULL-SCALE RANGE
(FSR) = +10V
00 0000 0000 0011
00 0000 0000 0010
1LSB = ^{FSR x VREF}
16384 x 4.096
00 0000 0000 0001
00 0000 0000 0000
0123
16383
16382 16384
INPUT VOLTAGE (LSB)
Figure 8. MAX1156 Transfer Function
OUTPUT CODE
11 1111 1111 1111
11 1111 1111 1110
11 1111 1111 1101
MAX1158
INPUT RANGE = -10V TO +10V
FULL-SCALE
TRANSITION
10 0000 0000 0001
10 0000 0000 0000
01 1111 1111 1111
FULL-SCALE RANGE
(FSR) = +20V
00 0000 0000 0011
00 0000 0000 0010
1LSB = ^{FSR x VREF}
16384 x 4.096
00 0000 0000 0001
00 0000 0000 0000
-8192 -8190
0
-8191 -8189 -1 +1
+8190 +8192
+8191
INPUT VOLTAGE (LSB)
Figure 9. MAX1158 Transfer Function
OUTPUT CODE
11 1111 1111 1111
11 1111 1111 1110
11 1111 1111 1101
MAX1174
INPUT RANGE = -5V TO +5V
FULL-SCALE
TRANSITION
10 0000 0000 0001
10 0000 0000 0000
01 1111 1111 1111
FULL-SCALE RANGE
(FSR) = +10V
00 0000 0000 0011
00 0000 0000 0010
1LSB = ^{FSR x VREF}
16384 x 4.096
00 0000 0000 0001
00 0000 0000 0000
-8192 -8190
0
-8191 -8189 -1 +1
+8190 +8192
+8191
INPUT VOLTAGE (LSB)
Figure 10. MAX1174 Transfer Function
the end of acquisition, the accuracy of the system can
be compromised. To avoid this situation, increase the
acquisition time, use a driving circuit that can settle
within t_ACQ, or leave the MAX1158/MAX1174 powered
up by setting the voltage at R/C low during the second
falling edge of CS.
Layout, Grounding, and Bypassing
For best performance, use printed circuit boards. Do
not run analog and digital lines parallel to each other,
and do not layout digital signal paths underneath the
ADC package. Use separate analog and digital ground
planes with only one point connecting the two ground
systems (analog and digital) as close to the device as
possible.
Route digital signals far away from sensitive analog and
reference inputs. If digital lines must cross analog lines,
do so at right angles to minimize coupling digital noise
onto the analog lines. If the analog and digital sections
share the same supply, isolate the digital and analog
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