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MAX1272CPA
Fault-Protected / 12-Bit ADCs with Software-Selectable Input Range
General DescriptionThe 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; ±VREF, ±VREF / 2, 0 to VREF, 0 to VREF / 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.
ApplicationsIndustrial Control Systems
Data-Acquisition Systems
Robotics
Automatic Testing
Battery-Powered Instruments
Medical Instruments
FeaturesFour Software-Selectable Input Ranges
MAX1272: 0 to 10V, 0 to 5V, ±10V, ±5V
MAX1273: 0 to VREF, 0 to VREF / 2, ±VREF,
±VREF / 212-Bit Resolution, No Missing Codes5V Single-Supply OperationSPI/QSPI/MICROWIRE-Compatible 3-Wire
Interface87ksps Sampling Rate±12V Fault-Protected Analog Input (MAX1272)Internal (4.096V) or External (2.4V to 4.18V)
ReferenceLow Power
1.5mA at 87ksps
0.4mA at 10ksps
0.2mA at 1kspsFour Power-Down Modes8-Pin µMAX and PDIP Packages
MAX1272/MAX1273
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
Pin Configuration
Ordering Information19-2921; Rev 1; 12/03
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.
MAX1272/MAX1273
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDDto GND..............................................................-0.3V to +6V
AIN to GND (MAX1272)......................................................±12V
AIN to GND (MAX1273)........................................................±6V
DOUT, CS, DIN, SCLK, REF to GND..........-0.3V to (VDD+ 0.3V)
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin Plastic DIP (derate 9.1mW/°C above +70°C)......727mW
8-Pin µMAX (derate 4.5mW/°C above +70°C)..............362mW
Operating Temperature Ranges
MAX127_ C_ _.....................................................0°C to +70°C
MAX127_ E_ _...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Junction Temperature .....................................................+150°C
ELECTRICAL CHARACTERISTICS(VDD= 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, VREF= 4.096V, CREF= 1.0µF, fSCLK= 1.4MHz,
MAX1272/MAX1273
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
ELECTRICAL CHARACTERISTICS (continued)(VDD= 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, VREF= 4.096V, CREF= 1.0µF, fSCLK= 1.4MHz,
50% duty cycle, CLOAD= 50pF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1272/MAX1273
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
ELECTRICAL CHARACTERISTICS (continued)(VDD= 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, VREF= 4.096V, CREF= 1.0µF, fSCLK= 1.4MHz,
MAX1272/MAX1273
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
TIMING CHARACTERISTICS(VDD= 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, VREF= 4.096V, CREF= 1.0µF, fSCLK= 1.4MHz,
50% duty cycle, CLOAD= 50pF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Figures 1 and 4)
Note 1:Accuracy specifications tested at VDD= 5V. Performance at power-supply tolerance limit is guaranteed by power-supply
rejection test.
Note 2:Offset error nulled. The ideal last-code transition is (FS - 1.5 LSB).
Note 3:PSRR measured at full scale. Tested at ±10V (MAX1272) and ±4.096V (MAX1273) input ranges.
Note 4:Acquisition and conversion times are dependent on the clock speed.
Typical Operating Characteristics(Typical operating circuit, BIP = RNG = 1, VDD= 5V, external reference mode, VREF= 4.096V, CREF= 1.0µF, fSCLK= 1.4MHz,
50% duty cycle, 87ksps, TA= +25°C, unless otherwise noted.)
