MAX127, MAX127A, MAX127B, MAX128, MAX128A, MAX128B
Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface
First 2-Wire 12-Bit, 8-Channel, Serial ADCs Have +/-17V Fault-Protected Inputs
Active: In Production.
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 ±VREF, ±VREF/2, 0 to +VREF, 0 to +VREF/2 for the MAX128. This range 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 protected 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, I²C*-compatible serial interface that allows communication among multiple devices using SDA and SCL lines.
A hardware shutdown input (active-low 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.
- 12-Bit Resolution, 1/2 LSB Linearity
- +5V Single-Supply Operation
- I²C-Compatible, 2-Wire Serial Interface
- Four Software-Selectable Input Ranges
- MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V
- MAX128: 0 to +VREF, 0 to +VREF/2, ±VREF, ±VREF/2
- 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
- Battery-Powered Applications
- Data Acquisition
- Industrial Control Systems
Typical Operating Circuit
Notes and Comments
Multi-range, 12 bit, 2-wire interface
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Document Ref.: 19-4773
This page last modified: 2007-07-20