Part Number Description Cross Reference Pin/Package
AT3021 Low-Power 10-Bit A/D Converter with I²C Interface MCP3021 SOT23-5


     AT3021 is a successive approximation A/D converter (ADC) with 10-bit resolution. Available in the SOT-23 package, this device provides one single-ended input with very low power consumption. Based on an advanced CMOS technology, the AT3021 provides a low maximum conversion current and standby current of 250µA and 1µA, respectively. Low current consumption, com-bined with the small SOT-23 package, make this device ideal for battery-powered and remote data acquisition applications.

     Communication to the AT3021 is performed using a 2-wire I2C compatible interface. Standard (100 kHz) and Fast (400 kHz) I2C modes are available with the device. An on-chip conversion clock enables indepen-dent timing for the I2C and conversion clocks. The device is also addressable, allowing up to eight devices on a single 2-wire bus.

    The AT3021 runs on a single supply voltage that operates over a broad range of 2.7V to 5.5V. This device also provides excellent linearity of ±1 LSB differ-ential non-linearity (DNL) and ±1 LSB integral non-linearity (INL), maximum.


    10-bit resolution

    ±1 LSB DNL, ±1 LSB INL max.

    250 µA max conversion current

    5 nA typical standby current, 1 µA max.

    I2C™ compatible serial interface

    - 100 kHz I2C Standard mode

    - 400 kHz I2C Fast mode

    - Up to 8 devices on single 2-wire bus

    22.3 ksps in I2C Fast mode

    Single-ended analog input channel

    On-chip sample and hold

    On-chip conversion clock

    Single supply specified operation: 2.7V to 5.5V

    Temperature range:

    - Extended: -40°C to +125°C

    Small SOT-23 package


    Data Logging

    Multi-zone Monitoring

    Hand Held Portable Applications

    Battery Powered Test Equipment

    Remote or Isolated Data Acquisition



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