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Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC

Product Details

Key Features

Parametric specs for Precision DACs (< 1MHz)
Resolution (bits) 10
# Channels 2
Interface Serial - I2C
Output Type Voltage- Buffered
Reference Ext.
INL (±LSB) (max) 4
Supply Range (V) (min) 2.7
Supply Range (V) (max) 5.5
ICC (mA) (max) 0.215
Settling Time (µs) (typ) 4
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
2.74
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Simplified Block Diagram

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Parameters

Parametric specs for Precision DACs (&lt; 1MHz)
Resolution (bits) 10
# Channels 2
Interface Serial - I2C
Output Type Voltage- Buffered
Reference Ext.
INL (±LSB) (max) 4
Supply Range (V) (min) 2.7
Supply Range (V) (max) 5.5
ICC (mA) (max) 0.215
Settling Time (µs) (typ) 4
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
2.74

Key Features

  • Ultra-Low Supply Current
    • 115µA at VDD = 3.6V
    • 135µA at VDD = 5.5V
  • 300nA Low-Power Power-Down Mode
  • Single 2.7V to 5.5V Supply Voltage
  • Fast 400kHz I²C-Compatible 2-Wire Serial Interface
  • Schmitt-Trigger Inputs for Direct Interfacing to Optocouplers
  • Rail-to-Rail Output Buffer Amplifiers
  • Three Software-Selectable Power-Down Output Impedances
    • 100kΩ, 1kΩ, and High Impedance
  • Read-Back Mode for Bus and Data Checking
  • Power-On Reset to Zero
  • 8-Pin µMAX Package

Applications/Uses

  • Battery-Powered Applications
  • Digital Gain and Offset Control
  • Low-Cost Instrumentation
  • Programmable Attenuators
  • Programmable Voltage and Current Sources
  • VCO/Varactor Diode Control

Description

The MAX5821 is a dual, 10-bit voltage-output, digital-to-analog converter (DAC) with an I²C-compatible, 2-wire interface that operates at clock rates up to 400kHz. The device operates from a single 2.7V to 5.5V supply 115µA at VDD = 3.6V. A power-down mode decreases current consumption to less than 1µA. The MAX5821 features three software-selectable power-down output impedances: 100kΩ, 1kΩ, and high impedance. Other features include internal precision Rail-to-Rail output buffers and a power-on reset (POR) circuit that powers up the DAC in the 100kΩ power-down mode.

The MAX5821 features a double-buffered I²C-compatible serial interface that allows multiple devices to share a single bus. All logic inputs are CMOS-logic compatible and buffered with Schmitt triggers, allowing direct interfacing to optocoupled and transformer-isolated interfaces. The MAX5821 minimizes digital noise feedthrough by disconnecting the clock (SCL) signal from the rest of the device when an address mismatch is detected. The MAX5821 is specified over the extended temperature range of -40°C to +85°C and is available in a miniature 8-pin µMAX® package. Refer to the MAX5822 data sheet for the 12-bit version.

Simplified Block Diagram

MAX5821: Typical Operating Circuit MAX5821: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .