MAX127 Maxim, MAX127 Datasheet
MAX127
Manufacturer Part Number
MAX127
Description
Multirange / +5V / 12-Bit DAS with 2-Wire Serial Interface
Manufacturer
Maxim
Datasheet
1.MAX127.pdf
(16 pages)
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The MAX127/MAX128 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
programmable for a variety of ranges: ±10V, ±5V, 0 to
+10V, 0 to +5V for the MAX127; and ±V
to +V
switching 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 pro-
tected to ±16.5V; a fault condition on any channel will
not affect the conversion result of the selected channel.
Other features include a 5MHz bandwidth track/hold,
an 8ksps throughput rate, and the option of an internal
4.096V or external reference.
The MAX127/MAX128 feature a 2-wire, I
serial interface that allows communication among multi-
ple devices using SDA and SCL lines.
A hardware shutdown input (SHDN) and two software-
programmable power-down modes (standby and full
power-down) are provided for low-current shutdown
between conversions. In standby mode, the reference-
buffer remains active, eliminating start-up delays.
The MAX127/MAX128 are available in 24-pin DIP or
space-saving 28-pin SSOP packages.
Ordering Information continued at end of data sheet.
19-4773; Rev 0; 7/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX127ACNG
MAX127ACNG
PART
REF
Industrial Control Systems
Data-Acquisition Systems
Robotics
Automatic Testing
Battery-Powered Instruments
Medical Instruments
, 0 to +V
TEMP. RANGE
0°C to +70°C
0°C to +70°C
________________________________________________________________ Maxim Integrated Products
REF
Ordering Information
/2 for the MAX128. This range
General Description
24 Narrow Plastic DIP
24 Narrow Plastic DIP
PIN-PACKAGE
Applications
Multirange, +5V, 12-Bit DAS with
REF
2
C-compatible
, ±V
REF
(LSB)
±1/2
±1
/2, 0
INL
Pin Configurations appear at end of data sheet.
2-Wire Serial Interface
4.7 F
12-Bit Resolution, 1/2 LSB Linearity
+5V Single-Supply Operation
I
Four Software-Selectable Input Ranges
8 Analog Input Channels
8ksps Sampling Rate
±16.5V Overvoltage-Tolerant Input Multiplexer
Internal 4.096V or External Reference
Two Power-Down Modes
24-Pin Narrow DIP or 28-Pin SSOP Packages
2
C-Compatible, 2-Wire Serial Interface
MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V
MAX128: 0 to +V
ANALOG
INPUTS
0.01 F
±V
Typical Operating Circuit
REF
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
REF
REFADJ
/2
0.1 F
REF
DGND
MAX127
MAX128
, 0 to +V
AGND
+5V
SHDN
V
SDA
SCL
DD
A0
A1
A2
REF
/2, ±V
Features
REF
SCL SDA
C
,
1k
1
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