Description

The MAX1220/MAX1257/MAX1258 integrate a 12-bit, multichannel, analog-to-digital converter (ADC), and a 12-

bit, octal, digital-to-analog converter (DAC) in a single IC. These devices also include a temperature sensor and

configurable general-purpose I/O ports (GPIOs) with a 25MHz SPI-/QSPI™-/MICROWIRE®-compatible serial

interface. The ADC is available in 8 and 16 input-channel versions. The octal DAC outputs settle within 2.0µs and

the ADC has a 225ksps conversion rate.

Features

♦12-Bit, 225ksps ADC

  Analog Multiplexer with True-Differential Track/Hold (T/H)

  16 Single-Ended Channels or 8 Differential Channels (Unipolar or Bipolar) (MAX1257/MAX1258)

  Eight Single-Ended Channels or Four Differential Channels (Unipolar or Bipolar) (MAX1220)

  Excellent Accuracy: ±0.5 LSB INL, ±0.5 LSB DNL

♦12-Bit, Octal, 2µs Settling DAC

  Ultra-Low Glitch Energy (4nV•s)

  Power-Up Options from Zero Scale or Full Scale

  Excellent Accuracy: ±0.5 LSB INL

♦Internal Reference or External Single-Ended/Differential Reference Internal Reference Voltage 2.5V or 4.096V

♦Internal ±1°C Accurate Temperature Sensor

♦On-Chip FIFO Capable of Storing 16 ADC Conversion Results and One Temperature Result

♦On-Chip Channel-Scan Mode and Internal Data-Averaging Features

♦Analog Single-Supply Operation

  +2.7V to +3.6V or +4.75V to +5.25V

♦Digital Supply: +2.7V to AVDD

♦25MHz, SPI/QSPI/MICROWIRE Serial Interface

♦AutoShutdown Between Conversions

♦Low-Power ADC

  2.5mA at 225ksps

  22µA at 1ksps

  0.2µA at Shutdown

♦Low-Power DAC: 1.5mA

♦Evaluation Kit Available (Order MAX1258EVKIT)General

Applications

Controls for Optical Components

Base-Station Control Loops

System Supervision and Control

Data-Acquisition Systems