MAX1270 Maxim, MAX1270 Datasheet
MAX1270
Manufacturer Part Number
MAX1270
Description
Multirange / +5V / 8-Channel / Serial 12-Bit ADCs
Manufacturer
Maxim
Datasheet
1.MAX1270.pdf
(20 pages)
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The MAX1270/MAX1271 are multirange, 12-bit data-
acquisition systems (DAS) that require only a single +5V
supply for operation, yet accept signals at their analog
inputs that may span above the power-supply rail and
below ground. These systems provide eight analog
input channels that are independently software pro-
grammable for a variety of ranges: ±10V, ±5V, 0 to
+10V, 0 to +5V for the MAX1270; ±V
V
ing increases the effective dynamic range to 14 bits and
provides the flexibility to interface 4–20mA, ±12V, and
±15V powered sensors directly to a single +5V system.
In addition, these converters are fault protected to
±16.5V; a fault condition on any channel will not affect
the conversion result of the selected channel. Other fea-
tures include a 5MHz bandwidth track/hold, software-
selectable internal/external clock, 110ksps throughput
rate, and internal 4.096V or external reference opera-
tion.
The MAX1270/MAX1271 serial interface directly con-
nects to SPI™/QSPI™ and MICROWIRE™ devices with-
out external logic.
A hardware shutdown input (SHDN) and two software-
programmable power-down modes, standby (STBYPD)
or full power-down (FULLPD), are provided for low-cur-
rent shutdown between conversions. In standby mode,
the reference buffer remains active, eliminating start-up
delays.
The MAX1270/MAX1271 are available in 24-pin narrow
DIP or space-saving 28-pin SSOP packages.
Ordering Information continued at end of data sheet.
19-4782; Rev 1; 3/99
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX1270ACNG
MAX1270BCNG
MAX1270ACAI
MAX1270BCAI
REF
, 0 to V
PART
Industrial Control Systems
Data-Acquisition Systems
Robotics
Automatic Testing
Battery-Powered Instruments
Medical Instruments
REF
/2 for the MAX1271. This range switch-
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C 28 SSOP
____________________________________________________________ Maxim Integrated Products
RANGE
TEMP.
Ordering Information
General Description
24 Narrow Plastic DIP
24 Narrow Plastic DIP
28 SSOP
PIN-PACKAGE
Applications
REF
, ±V
REF
/2, 0 to
Multirange, +5V, 8-Channel,
±1/2
±1
±1/2
±1
(LSB)
INL
Pin Configurations appear at end of data sheet.
o 12-Bit Resolution, 1/2LSB Linearity
o +5V Single-Supply Operation
o SPI/QSPI and MICROWIRE-Compatible
o Four Software-Selectable Input Ranges
o Eight Analog Input Channels
o 110ksps Sampling Rate
o ±16.5V Overvoltage-Tolerant Input Multiplexer
o Internal 4.096V or External Reference
o Two Power-Down Modes
o Internal or External Clock
o 24-Pin Narrow DIP or 28-Pin SSOP Packages
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
3-Wire Interface
4.7µF
MAX1270: 0 to +10V, 0 to +5V, ±10V, ±5V
MAX1271: 0 to V
ANALOG
INPUTS
Serial 12-Bit ADCs
0.01µF
Typical Operating Circuit
±V
REF
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
REF
REFADJ
0.1µF
REF
/2
DGND
MAX1270
MAX1271
, 0 to V
AGND
SSTRB
+5V
DOUT
SHDN
SCLK
V
REF
DD
DIN
CS
/2, ±V
Features
MC68HCXX
I/O
SCK
MOSI
MISO
REF
,
7-169
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