Overview

Features and Benefits

  • 12-bit ADC, 1 μs per channel conversion time
  • 6 analog input channels, 
  • CM range 0.5 V to 27.5 V
  • 6 auxiliary ADC Inputs
  • ±1.6 mV cell voltage accuracy
  • On-chip voltage regulator
  • Cell balancing interface
  • Daisy-chain interface
  • Internal reference: ±3 ppm/°C
  • 1.8 μA power-down current
  • High input impedance
  • Serial interface with alert function
  • See data sheet for additional features

Product Details

The AD7280A contains all the functions required for general-purpose monitoring of stacked lithium ion batteries as used in hybrid electric vehicles, battery backup applications, and power tools. The part has multiplexed cell voltage and auxiliary ADC measurement channels for up to six cells of battery management. An internal ±3 ppm reference is provided that allows a cell voltage accuracy of ±1.6 mV. The ADC resolution is 12 bits and allows conversion of up to 48 cells within 7 μs.

The AD7280A operates from just one VDD supply that has a range of 8 V to 30 V (with an absolute maximum rating of 33 V). The part provides six differential analog input channels to accommodate large common-mode signals across the full VDD range. Each channel allows an input signal range, VIN(+) − VIN(−), of 1 V to 5 V. The input pins assume a series stack of six cells. In addition, the part includes six auxiliary ADC input channels that can be used for temperature measurement or system diagnostics.

The AD7280A includes on-chip registers that allow a sequence of channel measurements to be programmed to suit the applications requirements.

The AD7280A also includes a dynamic alert function that can detect if the cell voltages or auxiliary ADC inputs exceed an upper or lower limit defined by the user. The AD7280A has cell balancing interface outputs designed to control external FET transistors to allow discharging of individual cells.

The AD7280A includes a built in self-test feature that internally applies a known voltage to the ADC inputs.

There is a daisy-chain interface that allows up to eight parts to be stacked without the need for individual device isolation.

The AD7280A requires only one supply pin that takes 6.5 mA under normal operation, while converting at 1 MSPS.

All this functionality is provided in a 48-lead LQFP package operating over a temperature range of −40°C to +105°C.

Applications

  • Lithium ion battery monitoring
  • Electric and hybrid electric vehicles
  • Power supply back up
  • Power tools

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Software & Systems Requirements

Reference Designs (2)

Product Recommendations

AD7280A Companion Parts

Recommended Digital Isolators

  • For a quad channel with integrated DC/DC converter: ADUM5401.
  • For dual channel, bidirectional communication: ADUM1201.

Recommended Battery Safety Monitor

  • For creating a fail-safe circuit and safe environment to the user: AD8280.

Recommended Current Sense Amplifiers

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Discussions

AD7280A Discussions

RE: AD7280A Cell balancing technique
5 day(s) ago in Power By Linear
RE: AD7280A High Current on ALERThi and SDIhi
7 week(s) ago in Precision ADCs
RE: AD7280A:  ADC input range
7 week(s) ago in Precision ADCs
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.