Specifications

12 Maxim Industrial Solutions
Programmable logic controllers (PLCs)
Analog input function
Benefits
• Reduce complexity and cost by
eliminating external gain stages and
muxes
– Each ADC measures eight unique bipolar
and unipolar input ranges
– Multiple software-programmable input
ranges up to ±12.288V full scale
• Flexible, easy-to-reuse circuit for
multiple applications
– 16-bit and 14-bit resolution in the same
package
• Eliminate external protection
components and save space and cost
– Up to ±16.5V analog-input protection
MAX1300*/MAX1301/MAX1302*/MAX1303
The MAX1300–MAX1303 ADC family is an ideal fit for PLC applica-
tions because they measure many unique unipolar and bipolar input
ranges, all with 16-bit operation and no missing codes. The eight
single-ended or differential input ranges vary from as low as a unipolar
0 to 2.048V full scale up to a bipolar ±12.288V full scale. Each input
channel can be programmed by software for a different input range,
making the MAX1300 family highly versatile. By eliminating analog
front-end (AFE) stages, these ADCs also reduce cost and area, while
increasing accuracy. The ADCs are also available with 14-bit resolu-
tion and 4 or 8 channels.
* Future product—contact factory for availability.
16-bit ADC with software-programmable input ranges on each ADC channel saves
design time
The MAX1300–MAX1303 ADCs reduce cost by offering programmable input-voltage ranges.
PGA
LOGIC
ISOLATED ANALOG-INPUT BOARD
16.5V FAULT
TOLERANT
AV
DD
DV
DD
DGND AGND
REF
REFREFADJ
CS
16-/14-BIT
SAR ADC
SPI
DOUT
SCLK
PLC
System
+12V
+V
REF
-V
REF
-12V
DC-DC
MAX1300*/MAX1031
MAX1302*/MAX1303
ISOLATION
BARRIER
FIFO
MUX