Rainbow Electronics MAX1273 - Manual

General Description
The MAX1272/MAX1273 multirange 12-bit data-acquisi-
tion systems (DAS) operate with a single 5V supply. The
software-programmable analog input accepts a variety
of voltage ranges: ±10V, ±5V, 0 to 10V, 0 to 5V for the
MAX1272; ±V
REF , ±V REF / 2, 0 to V REF , 0 to V REF / 2 for
the MAX1273. The software-selectable extended analog
input range increases the effective dynamic range to 14
bits and provides the flexibility to interface 4–20mA pow-
ered sensors directly to a single 5V system. In addition,
the MAX1272 provides fault protection to ±12V. Other
features include a 5MHz track/hold (T/H) bandwidth,
87ksps throughput rate, and internal (4.096V) or external
(2.40V to 4.18V) reference.
The MAX1272/MAX1273 serial interfaces connect
directly to SPI™/QSPI™/MICROWIRE™-compatible
devices without any external logic.
Four software-programmable power-down modes
(delayed standby, immediate standby, delayed full power-
down, and immediate full power-down) provide low-cur-
rent shutdown between conversions. In standby mode, the
internal reference buffer remains active, thus eliminating
startup delay.
The MAX1272/MAX1273 are available in 8-pin PDIP
and µMAX packages. Both devices are available in the
commercial (0°C to +70°C) or extended (-40°C to
+85°C) temperature range.
Applications
Industrial Control Systems
Data-Acquisition Systems
Robotics
Automatic Testing
Battery-Powered Instruments
Medical Instruments
Features
♦ Four Software-Selectable Input Ranges
MAX1272: 0 to 10V, 0 to 5V, ±10V, ±5V
MAX1273: 0 to V
REF
, 0 to V
REF
/ 2, ±V
REF
,
±V REF / 2
♦ 12-Bit Resolution, No Missing Codes
♦ 5V Single-Supply Operation
♦ SPI/QSPI/MICROWIRE-Compatible 3-Wire
Interface
♦ 87ksps Sampling Rate
♦ ±12V Fault-Protected Analog Input (MAX1272)
♦ Internal (4.096V) or External (2.4V to 4.18V)
Reference
♦ Low Power
1.5mA at 87ksps
0.4mA at 10ksps
0.2mA at 1ksps
♦ Four Power-Down Modes
♦ 8-Pin µMAX and PDIP Packages
MAX1272/MAX1273
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
________________________________________________________________ Maxim Integrated Products 1
REF
AIN GND
1
2
8
7
DOUT
CS DIN
V DD
SCLK
PDIP/ µMAX
TOP VIEW
3
4
6
5
MAX1272
MAX1273
Pin Configuration
Ordering Information
19-2921; Rev 0; 7/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART
TEMP
RANGE
PIN-
PACKAGE INL
(LSB)
MAX1272CPA 0 °C to +70°C 8 Plastic DIP ± 1
MAX1272CUA 0 °C to +70°C 8 µMAX ± 1
MAX1272EPA -40 °C to +85°C 8 Plastic DIP ± 1
MAX1272EUA -40 °C to +85°C 8 µMAX ± 1
MAX1273CPA 0 °C to +70°C 8 Plastic DIP ± 1
MAX1273CUA 0 °C to +70°C 8 µMAX ± 1
MAX1273EPA -40 °C to +85°C 8 Plastic DIP ± 1
MAX1273EUA -40 °C to +85°C 8 µMAX ± 1
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Typical Application Circuit appears at end of data sheet.