Features and Benefits

  • Fast 14-Bit ADC with 5 µs Conversion Time
  • 8-Lead SOIC Package
  • Single 5 V Supply Operation
  • High Speed, Easy-to-Use, Serial Interface
  • On-Chip Track/Hold Amplifier
  • High Input Impedance
  • Selection of Input Ranges:
  • ±10 V for AD7894-10
    ±2.5 V for AD7894-3
    0 V to +2.5 V for AD7894-2
  • Low Power: 20 mW Typ
  • Pin Compatible Upgrade of 12-Bit AD7895

Product Details

The AD7894 is a fast, 14-Bit Analog-to-Digital Converter that operates from a single +5 V supply and is housed in a small 8-pin SOIC. The part contains a 5 µs successive approximation A/D converter, an on-chip track/hold amplifier, an on-chip clock and a high speed serial interface. Output data from the AD7894 is provided via a high speed, serial interface port. This two-wire serial interface has a serial clock input and a serial data output with the external serial clock accessing the serial data from the part.

In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the AD7894 is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio. The part accepts an analog input range of ±10 V (AD7894-10), ±2.5V (AD7894-3), 0 V to 2.5 V (AD7894-2), and operates from a single +5 V supply consuming only 20 mW typical.

The AD7894 features a high sampling rate mode and, for low power applications, a proprietary automatic power down mode where the part automatically goes into power down once conversion is complete and "wakes up" before the next conversion cycle. The part is available in a small outline IC (SOIC).


  1. Fast, 14-Bit ADC in 8-Lead Package The AD7894 contains a 5␣ µs ADC, a track/hold amplifier, control logic and a high speed serial interface, all in an 8-lead package. This offers considerable space saving over alternative solutions.
  2. Low Power, Single Supply Operation The AD7894 operates from a single +5 V supply and consumes only 20 mW. The automatic power-down mode, where the part goes into power-down once conversion is complete and “wakes up” before the next conversion cycle, makes the AD7894 ideal for battery powered or portable applications.
  3. High Speed Serial Interface The part provides high speed serial data and serial clock lines allowing for an easy, two-wire serial interface arrangement. 

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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