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AD7891:  True Bipolar Input, Single Supply, Parallel, 8-Channel, 12-Bit High Speed Data Acquisition System

Product Details


The AD7891 is an eight-channel 12-bit data acquisition system with a choice of either parallel or serial interface structure. The part contains an input multiplexer, an on-chip track/hold amplifier, a high speed 12-bit ADC, a +2.5 V reference and a high speed interface. The part operates from a single +5 V supply and accepts a variety of analog input ranges across two models, the AD7891-1 (±5 V and ±10 V) and the AD7891-2 (0 V to +2.5 V, 0 V to +5 V and ±2.5 V).

The AD7891 provides the option of either a parallel interface or serial interface structure determined by the MODE pin. The part has standard control inputs and fast data access times for both the serial and parallel interfaces which ensures easy interfacing to modern microprocessors, microcontrollers and digital signal processors.

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.

Power dissipation in normal mode is 90 mW typical while in the standby mode this is reduced to 75 µW typ. The part is available in a 44-pin plastic quad flat-pack (PQFP) and a 44- lead plastic leaded chip carrier (PLCC).

FEATURES and BENEFITS

  • Fast 12-Bit ADC with 1.6 µs Conversion Time
  • 8 Single-Ended Analog Input Channels
  • Overvoltage Protection on Each Channel
  • Selection of Input Ranges:
    ±5 V, ±10 V for AD7891-1
    0 to +2.5 V, 0 to +5 V, ±2.5 V for AD7891-2
  • Parallel and Serial Interface
  • On-Chip Track/Hold Amplifier
  • On-Chip Reference
  • Single-Supply, Low Power Operation (100 mW Max)
  • Power-Down Mode (75 µW Typ)

Functional Block Diagram for AD7891

Documentation

Title Content Type File Type
AD7891: LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System Data Sheet  (Rev D, 04/2004) (pdf, 1111 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

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

AD7891 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7891ACHIPS-1 Status: Production CHIPS OR DIE 0 Ind Tray, 35 $24.17 $24.17 Y  Material Info Notify Me Purchase
AD7891ACHIPS-2 Status: Obsolete CHIPS OR DIE 0 Ind Tray, 35 - - Y  Material Info Notify Me Contact ADI
AD7891AP-1 Status: Production 44 ld PLCC 44 Ind Tube, 27 $21.47 $18.10 N  Material Info PCN Purchase
AD7891AP-1REEL Status: Production 44 ld PLCC 44 Ind Reel, 500 - $18.10 N  Material Info PCN Purchase
AD7891AP-2 Status: Production 44 ld PLCC 44 Ind Tube, 27 $22.54 $19.01 N  Material Info PCN Purchase
AD7891AP-2REEL Status: Production 44 ld PLCC 44 Ind Reel, 500 - $19.01 N  Material Info PCN Purchase
AD7891APZ-1 Status: Production 44 ld PLCC 44 Ind Tube, 27 $18.60 $15.68 Y  Material Info Notify Me Purchase
AD7891APZ-1REEL Status: Production 44 ld PLCC 44 Ind Reel, 500 - $15.68 Y  Material Info Notify Me Purchase
AD7891APZ-2 Status: Production 44 ld PLCC 44 Ind Tube, 27 $18.60 $15.68 Y  Material Info Notify Me Purchase
AD7891APZ-2REEL Status: Production 44 ld PLCC 44 Ind Reel, 500 - $15.68 Y  Material Info Notify Me Purchase
AD7891ASZ-1 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $17.71 $14.93 Y  Material Info PCN Purchase
AD7891ASZ-1REEL Status: Production 44 ld PLCC 44 Comm. Reel, 800 - $14.93 Y  Material Info PCN Purchase
AD7891ASZ-2 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $17.71 $14.93 Y  Material Info PCN Purchase
AD7891ASZ-2REEL Status: Production 44 ld MQFP (13.90mm wide) 44 Comm. Reel, 800 $17.71 $14.93 Y  Material Info PCN Purchase
AD7891BP-1 Status: Production 44 ld PLCC 44 Ind Tube, 27 $27.07 $23.01 N  Material Info PCN Purchase
AD7891BP-1REEL Status: Last Time Buy 44 ld PLCC 44 Ind Reel, 500 - $23.01 N  Material Info PCN/PDN Purchase
AD7891BP-2 Status: Production 44 ld PLCC 44 Ind Tube, 27 $24.60 $20.91 N  Material Info PCN Purchase
AD7891BP-2REEL Status: Last Time Buy 44 ld PLCC 44 Ind Reel, 500 - $20.91 N  Material Info PCN/PDN Purchase
AD7891BPZ-1 Status: Production 44 ld PLCC 44 Ind Tube, 27 $22.31 $18.96 Y  Material Info Notify Me Purchase
AD7891BPZ-1REEL Status: Production 44 ld PLCC 44 Ind Reel, 500 - $18.96 Y  Material Info Notify Me Purchase
AD7891BSZ-1 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $21.25 $18.06 Y  Material Info PCN Purchase
AD7891BSZ-2 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $21.25 $18.06 Y  Material Info PCN Purchase
AD7891YPZ-1 Status: Production 44 ld PLCC 44 Comm. Tube, 27 $41.95 $35.70 Y  Material Info Notify Me Purchase
AD7891YSZ-1 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $39.95 $34.00 Y  Material Info PCN Purchase
AD7891YSZ-1REEL Status: Last Time Buy 44 ld MQFP (13.90mm wide) 44 Comm. Reel, 800 - $34.00 Y  Material Info PCN/PDN Purchase
AD7891YSZ-2 Status: Production 44 ld MQFP (13.90mm wide) 44 Ind Tray, 96 $39.95 $34.00 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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