Data Acquisition System Single ADC Single DAC 12-Bit 48-Pin LQFP

The MAX1365/MAX1367 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 420mA (or 0 to 16mA) current driver. The MAX1365/MAX1367"s analog input voltage range is programmable to either ±2V or ±200mV. The MAX1367 drives a 3.5-digit (±1999 count) display and the MAX1365 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 420mA (or 0 to 16mA) current-loop output. In normal operation, the 0 to 16mA/420mA 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 MAX1365/MAX1367 allow direct access to the 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 provide greater than 100dB rejection of simultaneous 50Hz and 60Hz line noise. Other features include data hold, peak detection, and overrange/underrange detection. The MAX1365/MAX1367 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.

• Stand-Alone, Digital Panel Meter
  • 20-Bit Sigma-Delta ADC
  • 4.5-Digit Resolution (±19,999 Count, MAX1365)
  • No Integrating/Autozeroing Capacitors
  • 100M? Input Impedance
  • ±200mV or ±2.000V Input Range
• 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
• 48-Pin, 7mm x 7mm TQFP Package