ADC080x Analog-to-Digital Converters

By Texas Instruments 86

ADC080x Analog-to-Digital Converters

Texas Instruments' ADC0801, ADC0802, ADC0803, ADC0804, and ADC0805 devices are CMOS 8-bit successive approximation converters (ADC) that use a differential potentiometric ladder – similar to the 256R products. These converters are designed to allow operation with the NSC800 and INS8080A derivative control bus with tri-state output latches directly driving the data bus. These ADCs appear like memory locations or I/O ports to the microprocessor and no interfacing logic is needed.

Differential analog voltage inputs allow increasing the common-mode rejection and offsetting the analog zero input voltage value. In addition, the voltage reference input can be adjusted to allow encoding any smaller analog voltage span to the full eight bits of resolution.

Features
  • Compatible with 8080 µP derivatives; no interfacing logic needed; access time 135 ns
  • Easy interface to all microprocessors or operates as a stand-alone device
  • Differential analog voltage inputs
  • Logic inputs and outputs meet both MOS and TTL voltage-level specifications
  • Works with 2.5 V (LM336) voltage reference
  • 0 V to 5 V analog input voltage range with single 5 V supply
  • On-chip clock generator
  • No zero adjust required
  • 0.3 inch standard width 20-pin DIP package
  • 20-pin molded chip carrier or small outline package
  • Operates ratiometrically or with 5 VDC, 2.5 VDCor analog span adjusted voltage reference key specifications
    • Resolution: eight bits
    • Total error: ±1/4 LSB, ±1/2 LSB, and ±1 LSB
    • Conversion time: 100 µs

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