MAX1368
Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4-20mA Output
Part Details
- Microcontroller (µC)-Interface, Digital Panel Meter
- 20-Bit Sigma-Delta ADC
- 4.5-Digit Resolution (±19,999 Count, MAX1366)
- 3.5-Digit Resolution (±1999 Count, MAX1368)
- 4.5-Digit Resolution (±19,999 Count, MAX1366)
- No Integrating/Autozeroing Capacitors
- 100MΩ Input Impedance
- ±200mV or ±2.000V Input Range
- 20-Bit Sigma-Delta ADC
- LED Display
- Common-Cathode 7-Segment LED Driver
- Programmable LED Current (0 to 20mA)
- 2.5Hz Update Rate
- Output DAC and Current Driver
- ±15-Bit DAC with 14-Bit Linear V/I Converter
- Selectable 0 to 16mA or 4–20mA Current Output
- Unipolar/Bipolar Modes
- ±50µA Zero Scale, ±40ppmFS/°C (typ)
- ±0.5% Gain Error, ±25ppmFS/°C (typ)
- Separate 7V to 30V Supply for Current-Loop Output
- 2.7V to 5.25V ADC/DAC Supply
- 4.75V to 5.25V V/I Converter Supply
- Internal 2.048V Reference or External Reference
- SPI™-/QSPI™-/MICROWIRE™-Compatible Serial Interface
- 48-Pin, 7mm x 7mm TQFP Package
The MAX1366/MAX1368 low-power, 4.5- and 3.5-digit, panel meters feature an integrated sigma-delta analog-to-digital converter (ADC), LED display drivers, voltage digital-to-analog converter (DAC), and a 4–20mA (or 0 to 16mA) current driver.
The MAX1366/MAX1368's analog input voltage range is programmable to either ±2V or ±200mV. The MAX1368 drives a 3.5-digit (±1999 count) display and the MAX1366 drives a 4.5-digit (±19,999 count) display. The ADC output directly drives the LED display as well as the voltage DAC, which, in turn, drives the 4–20mA (or 0 to 16mA) current-loop output.
In normal operation, the 0 to 16mA/4–20mA current-loop output follows the ±2V or ±200mV analog input to drive remote panel-meter displays, data loggers, and other industrial controllers. For added flexibility, the MAX1366/MAX1368 allow direct access to the ADC result, DAC output, and the V/I converter input.
The sigma-delta ADC does not require external precision integrating capacitors, autozero capacitors, crystal oscillators, charge pumps, or other circuitry commonly required in dual-slope ADC panel-meter circuits. On-chip analog input and reference buffers allow direct interface with high-impedance signal sources. Excellent common-mode rejection and digital filtering provides greater than 100dB rejection of simultaneous 50Hz and 60Hz line noise. Other features include data hold and peak detection and overrange/underrange detection.
The MAX1366/MAX1368 require a 2.7V to 5.25V supply, a 4.75V to 5.75V V/I supply, and a 7V to 30V loop supply. They are available in a space-saving (7mm x 7mm), 48-pin TQFP package and operate over the extended (-40°C to +85°C) temperature range.
Applications
- Automated Test Equipment (ATE)
- Data Acquisition Systems
- Digital Multimeters
- Digital Panel Meters
- Digital Voltmeters
- Industrial Process Control
Documentation
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
Evaluation Kits
Evaluation Kit/Evaluation System for the MAX1365, MAX1366, MAX1367, and MAX1368
Evaluation Kit/Evaluation System for the MAX1365, MAX1366, MAX1367, and MAX1368
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