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MAX1365, MAX1367
Stand-Alone, 4.5-/3.5-Digit Panel Meters with 4–20mA Output


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Description
FULL DATA SHEET (PDF, 964kB)
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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 4–20mA (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 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 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.

Key Features   Applications/Uses
  • Stand-Alone, Digital Panel Meter
    20-Bit Sigma-Delta ADC
        4.5-Digit Resolution (±19,999 Count, MAX1365)
        3.5-Digit Resolution (±1999 Count, MAX1367)
    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

     
  • Automated Test Equipment (ATE)
  • Data Acquisition Systems
  • Digital Multimeters
  • Digital Panel Meters
  • Digital Voltmeters
  • Industrial Process Control

    Key Specifications:   Precision ADCs (< 5Msps)
    Part Number ADC Resolution (Bits) Input Channels Conv. Rate (ksps) Max. Conv. Time (µs) Data Bus (Bits) Ref. (V) Input Range (V) Diff. In Supply Voltage (V) Typ. Supply Current (mA) Typ. Power (mW) Low Power Mode Standby Mode EV-Kit RoHS Available Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    MAX1365  12 1 0.005 200000 Serial Ext
    Int +2.048
    ±.2
    ±2
    No 3
    3.3
    5
    1.3 3.5 No Yes No Yes LQFP/48 83 -40 to +85 $9.18 @ 1k
    MAX1367   -  $6.96 @ 1k
    See All Precision ADCs (< 5Msps) (301)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX1365, MAX1367: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-3889; Rev 1; 2006-02-06
    This page last modified: 2006-03-10



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