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AD7890:  LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System

Product Details


The AD7890 is an 8-channel 12-bit data acquisition system. 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, serial interface. The part operates from a single 5 V supply and accepts an analog input range of ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2).

The multiplexer on the part is independently accessible. This allows the user to insert an antialiasing filter or signal conditioning, if required, between the multiplexer and the ADC. This means that one antialiasing filter can be used for all eight channels. Connection of an external capacitor allows the user to adjust the time given to the multiplexer settling to include any external delays in the filter or signal conditioning circuitry.

Output data from the AD7890 is provided via a high speed bidirectional serial interface port. The part contains an on-chip control register, allowing control of channel selection, conversion start, and power-down via the serial port. Versatile, high speed logic ensures easy interfacing to serial ports on microcontrollers and digital signal processors.

In addition to the traditional dc accuracy specifications such as linearity, full-scale, and offset errors, the AD7890 is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio.

Power dissipation in normal mode is low at 30 mW typical and the part can be placed in a standby (power-down) mode if it is not required to perform conversions. The AD7890 is fabricated in Analog Devices, Inc.'s Linear Compatible CMOS (LC2MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 24-lead, 0.3" wide, plastic or ceramic dual-in-line package or in a 24-lead small outline package (SOIC_W).

Product Highlights

  1. Complete 12-Bit Data Acquisition System-on-a-Chip. The AD7890 is a complete monolithic ADC combining an 8-channel multiplexer, 12-bit ADC, 2.5 V reference, and a track/hold amplifier on a single chip.
  2. Separate Access to Multiplexer and ADC. The AD7890 provides access to the output of the multiplexer allowing one antialiasing filter for 8 channels—a considerable savings over the 8 antialiasing filters required if the multiplexer is internally connected to the ADC.
  3. High Speed Serial Interface. The part provides a high speed serial interface for easy connection to serial ports of microcontrollers and DSP processors.

FEATURES and BENEFITS

  • Fast 12-bit ADC with 5.9 µs conversion time
  • Eight single-ended analog input channels
  • Selection of input ranges:
    ±10 V for AD7890-10
    0 V to 4.096 V for AD7890-4
    0 V to 2.5 V for AD7890-2
  • Allows separate access to multiplexer and ADC
  • On-chip track/hold amplifier
  • On-chip reference
  • High-speed, flexible, serial interface
  • Single supply, low-power operation (50 mW max)
  • Power-down mode (75 µW typ)

Functional Block Diagram for AD7890

Documentation

Title Content Type File Type
AD7890: LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System Data Sheet (Rev C, 09/2006) (pdf, 473 kB) Data Sheets PDF
AD7890: Military Data Sheet  (Rev C, 09/2001) (pdf) Data Sheets PDF
AN-413: Evaluation Board for the AD7890, 12-Bit Serial, Data Acquisition System  (pdf, 113 kB) Application Notes PDF
ADI Warns Against Misuse of COTS Integrated Circuits  (pdf, 13 kB)
(Revised 1/03)
Invites Customer Participation in Creative Mil/Aero System Solutions
Recommended Reading PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Interfacing to Serial Converters Analog Dialogue HTML
Space Qualified Parts List  (pdf, 93 kB)
This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
Aerospace Information 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

AD7890 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7890ACHIPS-10 Status: Contact ADI CHIPS OR DIE 0 Ind Tray, 45 - - Y  Material Info Notify Me Contact ADI
AD7890ACHIPS-2 Status: Production CHIPS OR DIE 0 Ind Tray, 45 $12.14 $12.14 Y  Material Info Notify Me Purchase
AD7890AN-10 Status: Last Time Buy 24 ld PDIP 24 Ind Tube, 15 $15.93 $13.55 N  Material Info PCN/PDN Purchase
AD7890ANZ-10 Status: Production 24 ld PDIP 24 Ind Tube, 15 $13.14 $11.17 Y  Material Info PCN Purchase
AD7890ANZ-2 Status: Production 24 ld PDIP 24 Ind Tube, 15 $13.80 $11.73 Y  Material Info PCN Purchase
AD7890ANZ-4 Status: Production 24 ld PDIP 24 Ind Tube, 15 $13.80 $11.73 Y  Material Info PCN Purchase
AD7890AR-10 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $14.03 $11.92 N  Material Info PCN Purchase
AD7890AR-2 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $14.03 $11.92 N  Material Info PCN Purchase
AD7890AR-4 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $14.73 $12.52 N  Material Info PCN Purchase
AD7890AR-4REEL Status: Last Time Buy 24 ld SOIC - Wide 24 Ind Reel, 1000 - $12.52 N  Material Info PCN/PDN Purchase
AD7890ARZ-10 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $12.14 $10.32 Y  Material Info PCN Purchase
AD7890ARZ-10REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $10.32 Y  Material Info PCN Purchase
AD7890ARZ-2 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $12.14 $10.32 Y  Material Info PCN Purchase
AD7890ARZ-2REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $10.32 Y  Material Info PCN Purchase
AD7890ARZ-4 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $12.75 $10.84 Y  Material Info PCN Purchase
AD7890ARZ-4REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $10.84 Y  Material Info PCN Purchase
AD7890BNZ-10 Status: Production 24 ld PDIP 24 Ind Tube, 15 $18.15 $15.44 Y  Material Info PCN Purchase
AD7890BNZ-2 Status: Production 24 ld PDIP 24 Ind Tube, 15 $18.15 $15.44 Y  Material Info PCN Purchase
AD7890BNZ-4 Status: Production 24 ld PDIP 24 Ind Tube, 15 $18.15 $15.44 Y  Material Info PCN Purchase
AD7890BR-10 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $18.47 $15.70 N  Material Info PCN Purchase
AD7890BR-10REEL Status: Last Time Buy 24 ld SOIC - Wide 24 Ind Reel, 1000 - $15.70 N  Material Info PCN/PDN Purchase
AD7890BR-4 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $19.39 $16.49 N  Material Info PCN Purchase
AD7890BRZ-10 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $16.79 $14.27 Y  Material Info PCN Purchase
AD7890BRZ-10REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $14.27 Y  Material Info PCN Purchase
AD7890BRZ-2 Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $16.79 $14.27 Y  Material Info PCN Purchase
AD7890BRZ-2REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $14.27 Y  Material Info PCN Purchase
AD7890BRZ-4REEL Status: Production 24 ld SOIC - Wide 24 Ind Reel, 1000 - $14.27 Y  Material Info PCN Purchase
AD7890SQ-10 Status: Production CERDIP GLASS SEAL 24 Mil Tube, 15 $65.01 $55.25 N  Material Info PCN Purchase
AD7890SQ-2 Status: Production CERDIP GLASS SEAL 24 Mil Tube, 15 $65.01 $55.25 N  Material Info PCN Purchase
AD7890SQ-4 Status: Production CERDIP GLASS SEAL 24 Mil Tube, 15 $68.26 $58.01 N  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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