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AD7862:  Simultaneous Sampling Dual 250 kSPS 12-Bit ADC

Product Details


The AD7862 is a high speed, low power, dual 12-bit A/D converter that operates from a single +5 V supply. The part contains two 4 µs successive approximation ADCs, two track/ hold amplifiers, an internal +2.5 V reference and a high speed parallel interface. There are four analog inputs that are grouped into two channels (A & B) selected by the A0 input. Each channel has two inputs (VA1 & VA2 or VB1 & VB2) that can be sampled and converted simultaneously thus preserving the relative phase information of the signals on both analog inputs. The part accepts an analog input range of ±10 V (AD7862-10), ±2.5 V (AD7862-3) and 0­2.5 V (AD7862-2). Overvoltage protection on the analog inputs for the part allows the input voltage to go to ±17 V, ±7 V or +7 V, respectively, without causing damage.

A single conversion start signal (CONVST) places both track/ holds into hold simultaneously and initiates conversion on both inputs. The BUSY signal indicates the end of conversion, and at this time the conversion results for both channels are available to be read. The first read after a conversion accesses the result from VA1 or VB1, while the second read accesses the result from VA2 or VB2, depending on whether the multiplexer select A0 is low or high, respectively. Data is read from the part via a 12-bit parallel data bus with standard CS and RD signals.

In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the part is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio.

The AD7862 is fabricated in Analog Devices' Linear Compatible CMOS (LC2MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. It is available in 28-lead SSOP, SOIC and DIP.

FEATURES and BENEFITS

  • Two Fast 12-Bit ADCs
  • Four Input Channels
  • Simultaneous Sampling & Conversion
  • 4 µs Throughput Time
  • Single Supply Operation
  • High Speed Parallel Interface
  • Low Power, 60 mW typ
  • Selection of Input Ranges:
    ±10 V for AD7862-10
    ±2.5 V for AD7862-3
    0 V to 2.5 V for AD7862-2
  • Power Saving Mode, 50 µW typ
  • Overvoltage Protection on Analog Inputs
  • 14-Bit Pin Compatible Upgrade (AD7863)

Functional Block Diagram for AD7862

Documentation

Title Content Type File Type
AD7862: Simultaneous Sampling Dual 250 kSPS 12-Bit ADC Data Sheet (Rev 0, 10/1996) (pdf, 414 kB) Data Sheets PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog  (pdf, 1885 kB)
8- to 18-Bit SAR ADCs with Sample Rates up to 3 MSPS -- The latest additions to ADI’s ADC portfolio offer unrivaled functionality in terms of channel count and power supply voltage, optimal power/speed ratios, and the smallest packages to meet the demands of any data acquisition application, including portable, industrial, medical, wireless, and communications.
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7862 IBIS Models IBIS Models HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD7862 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7862ACHIPS-10 Status: Obsolete CHIPS OR DIE 0 Comm. Tray, 45 - - Y  Material Info Notify Me Contact ADI
AD7862AN-10 Status: Last Time Buy 28 ld PDIP 28 Comm. Tube, 13 $16.37 $13.90 N  Material Info PCN/PDN Purchase
AD7862ANZ-10 Status: Production 28 ld PDIP 28 Comm. Tube, 13 $14.18 $12.04 Y  Material Info PCN Purchase
AD7862ANZ-3 Status: Obsolete 28 ld PDIP 28 Comm. Tube, 13 - - Y  Material Info PCN Contact ADI
AD7862AR-10 Status: Production 28 ld SOIC - Wide 28 Comm. Tube, 27 $15.14 $12.86 N  Material Info PCN Purchase
AD7862ARS-10 Status: Production 28 ld SSOP 28 Comm. Tube, 47 $15.14 $12.86 N  Material Info PCN Purchase
AD7862ARS-10REEL Status: Production 28 ld SSOP 28 Comm. Reel, 1500 - $12.86 N  Material Info PCN Purchase
AD7862ARS-2 Status: Last Time Buy 28 ld SSOP 28 Comm. Tube, 47 $15.14 $12.86 N  Material Info PCN/PDN Purchase
AD7862ARS-2REEL Status: Last Time Buy 28 ld SSOP 28 Comm. Reel, 1500 - $12.86 N  Material Info PCN/PDN Purchase
AD7862ARS-3 Status: Production 28 ld SSOP 28 Comm. Tube, 47 $15.14 $12.86 N  Material Info PCN Purchase
AD7862ARS-3REEL Status: Last Time Buy 28 ld SSOP 28 Comm. Reel, 1500 - $12.86 N  Material Info PCN/PDN Purchase
AD7862ARSZ-10 Status: Production 28 ld SSOP 28 Comm. Tube, 47 $13.11 $11.13 Y  Material Info PCN Purchase
AD7862ARSZ-10REEL Status: Production 28 ld SSOP 28 Comm. Reel, 1500 $13.11 $11.13 Y  Material Info PCN Purchase
AD7862ARSZ-2 Status: Production 28 ld SSOP 28 Comm. Tube, 47 $13.11 $11.13 Y  Material Info PCN Purchase
AD7862ARSZ-2REEL Status: Production 28 ld SSOP 28 Comm. Reel, 1500 - $11.13 Y  Material Info PCN Purchase
AD7862ARSZ-3 Status: Production 28 ld SSOP 28 Ind Tube, 47 $13.11 $11.13 Y  Material Info PCN Purchase
AD7862ARSZ-3REEL Status: Production 28 ld SSOP 28 Comm. Reel, 1500 - $11.13 Y  Material Info PCN Purchase
AD7862ARZ-10 Status: Production 28 ld SOIC - Wide 28 Comm. Tube, 27 $13.11 $11.13 Y  Material Info PCN Purchase
AD7862ARZ-10REEL Status: Production 28 ld SOIC - Wide 28 Comm. Reel, 1000 - $11.13 Y  Material Info PCN Purchase
AD7862ARZ-3 Status: Production 28 ld SOIC - Wide 28 Comm. Tube, 27 $13.11 $11.13 Y  Material Info PCN Purchase
AD7862ARZ-3REEL Status: Last Time Buy 28 ld SOIC - Wide 28 Ind Reel, 1000 - $11.13 Y  Material Info PCN/PDN Purchase
AD7862BR-10REEL Status: Last Time Buy 28 ld SOIC - Wide 28 Comm. Reel, 1000 - $16.72 N  Material Info PCN/PDN Purchase
AD7862BRZ-10 Status: Production 28 ld SOIC - Wide 28 Comm. Tube, 27 $17.05 $14.47 Y  Material Info PCN Purchase
AD7862BRZ-10REEL Status: Production 28 ld SOIC - Wide 28 Comm. Reel, 1000 - $14.47 Y  Material Info PCN Purchase
AD7862BRZ-3 Status: Production 28 ld SOIC - Wide 28 Comm. Tube, 27 $17.05 $14.47 Y  Material Info PCN Purchase
Price Table Help

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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