Search

Links
  • 3-1/2 Digit Analog-to-Digital Converters with Hold
    The TC7116A/TC7117A are 3-1/2 digit CMOS ADCs containing all the active components necessary to construct a 0.05% resolution measurement system. Seven-segment decoders, voltage reference, polarity and digit drivers, and clock circuit are integrated on-chip. The TC7116A drives LCDs and includes a backplane driver. The TC7117A drives common anode LED displays directly with an 8mA drive current per segment. These devices incorporate a display hold (HLDR) function. The displayed reading remains indefinitely, as long as HLDR is held high. Conversions continue, but output data display latches are not updated.

    Features

    • Zero Reading with Zero Input
    • Low Noise for Stable Display:
      - 2V or 200mV Full Scale Range (FSR)
    • Auto-Zero Cycle Eliminates Need for Zero
    • Convenient 9V Battery Operation: (TC7116/TC7116A)
    • High-Impedance CMOS Differential Inputs: 1012Ω
    • Low Temperature Drift Internal Reference:
      - TC7116A/TC7117A 20 ppm/°C, Typ.
      - TC7116/TC7117 80 ppm/°C, Typ.
    • Display Hold Function
    • Directly Drives LCD or LED Display
    • Low-Power Operation: 10mW
    • Adjustment Potentiometer
    • True Polarity Indication for Precision Null Applications


    Applications

    • Portable Instrumentation
    • Thermometry
    • Digital Meters: Voltage/Current/Ohms/Power, pH
    • Bridge Readouts: Strain Gauges, Load Cells, Null Detectors
    • Digital Scales, Process Monitors

    http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en010505
  • 3-1/2 Digit Analog-to-Digital Converters

    The TC7126A is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) containing all the active components necessary to construct a 0.05% resolution measurement system. Seven-segment decoders, digit and polarity drivers, clock circuit, and voltage reference are integrated on-chip. The TC7126A directly drives a Liquid Crystal Display (LCD), and includes a backplane driver.

    A low-cost, high resolution indicating meter requires only a display, four capacitors, and four resistors. The TC7126A’s extremely low-power drain and 9V battery operation make it ideal for portable applications.
    http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en010509
  • ICL7129A, MAX7129
    Low-noise, 4 1/2 digit, single-chip ADC with multiplexed LCD drivers.
    http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1495
  • 4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers

    The TC7129 is a 4-1/2 digit Analog-to-Digital Converter (ADC) that directly drives a multiplexed Liquid Crystal Display (LCD). Fabricated in high-performance, low-power CMOS, the TC7129 ADC is designed specifically for high-resolution, battery-powered digital multimeter applications. The traditional dual-slope method of A/D conversion has been enhanced with a successive integration technique to produce readings accurate to better than 0.005% of full-scale and resolution down to 10 μV per count.

    The TC7129 includes features important to multimeter applications. It detects and indicates low battery condition. A continuity output drives an annunciator on the display and can be used with an external driver to sound an audible alarm. Overrange and underrange outputs, along with a range-change input, provide the ability to create auto-ranging instruments. For snapshot readings, the TC7129 includes a latch-and-hold input to freeze the present reading. This combination of features makes the TC7129 the ideal choice for full-featured multimeter and digital measurement applications.



    Features

    • True Differential Input and Reference
    • Low Power Consumption: 500 μA at 9V
    • Overrange and Underrange Outputs
    • Count Resolution: ±19,999
    • Resolution on 200 mV Scale: 10 μV
    • External Phase Compensation Not Required
    • Range Select Input: 10:1
    • Direct LCD Driver for 4-1/2 Digits, Low Battery Indicator, Decimal Points, and Continuity Indicator
    • High Common Mode Rejection Ratio: 110 dB


    Applications

    • Full-Featured Multimeters
    • Digital Measurement Devices

    http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en010510
  • 3-1/2 Digit Analog-to-Digital Converters
    The TC7106A and TC7107A 3-1/2 digit direct display drive ADCs allow existing 7106/7107 based systems to be upgraded. Each device has a precision reference with a 20ppm/°C max temperature coefficient. This represents a 4 to 7 times improvement over similar 3-1/2 digit converters. Existing 7106 and 7107 based systems may be upgraded without changing external passive component values. The TC7107A drives common anode LED displays directly with 8mA per segment. A low cost, high resolution indicating meter requires only a display, four resistors, and four capacitors.The TC7106A low-power drain and 9V battery operation make it suitable for portable applications. The TC7106A/TC7107A reduces linearity error to less than 1 count. Rollover error – the difference in readings for equal magnitude, but opposite polarity input signals, is below ±1 count. High-impedance differential inputs offer 1pA leakage current and a 1012Ω input impedance. The differential reference input allows ratiometric measurements for ohms or bridge transducer measurements. The 15μVP–P noise performance ensures a “rock solid” reading. The auto-zero cycle ensures a zero display reading with a zero volts input.
    http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1335&dDocName=en010501

Wikipedia Wiki