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AD8842:  8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC

Product Details


The AD8842 provides eight general purpose digitally controlled voltage adjustment devices. The TrimDAC® capability allows replacement of the mechanical trimmer function in new designs. The AD8842 is ideal for ac or dc gain control of up to 50 kHz bandwidth signals. The four-quadrant multiplying capability is useful for signal inversion and modulation often found in video vertical deflection circuitry.

Internally the AD8842 contains eight voltage output digital-to-analog converters, each with separate voltage inputs. A new current conveyor amplifier design performs the four-quadrant multiplying function with a single amplifier at the output of the current steering digital-to-analog converter. This approach offers an improved constant input resistance performance versus previous voltage switched DACs used in TrimDAC circuits, eliminating the need for additional input buffer amplifiers.

Each DAC has its own DAC register that holds its output state. These DAC registers are updated from an internal serial-to-parallel shift register that is loaded from a standard 3-wire serial input digital interface. Twelve data bits make up the data word clocked into the serial input register. This data word is decoded where the first 4 bits determine the address of the DAC register to be loaded with the last 8 bits of data. A serial data output pin at the opposite end of the serial register allows simple daisy chaining in multiple DAC applications without additional external decoding logic.

The AD8842 consumes only 95 mW from ±5 V power supplies. For single 5 V supply applications consult the DAC-8841. The AD8842 is pin compatible with the 1 MHz multiplying band-width DAC8840. The AD8842 is available in 24-pin plastic DIP and surface mount SOL-24 packages.

Applications

  • Automatic Adjustment
  • Trimmer Replacement
  • Vertical Deflection Amplitude Adjustment
  • Waveform Generation and Modulation

FEATURES and BENEFITS

  • Low Cost
  • Replaces 8 Potentiometers
  • 50 kHz 4-Quadrant Multiplying Bandwidth
  • Low Zero Output Error
  • Eight Individual Channels
  • 3-Wire Serial Input
  • 500 kHz Update Data Loading Rate
  • ±3 V Output Swing
  • Midscale Preset, Zero Volts Out

Functional Block Diagram for AD8842

Documentation

Title Content Type File Type
AD8842: 8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC Data Sheet  (Rev A, 10/2011) (pdf, 506 kB) Data Sheets PDF
AN-219: Electronic Adjustment Made Easy with the TrimDAC®  (pdf, 404 kB) Application Notes PDF
Digital to Analog Converters ICs Solutions Bulletin  (pdf) Solutions Bulletins 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.

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Price, packaging, availability

AD8842 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8842AN Status: Obsolete 24 ld PDIP 24 Ind Tube, 15 - - N  Material Info PCN/PDN Contact ADI
AD8842ANZ Status: Production 24 ld PDIP 24 Ind Tube, 15 $10.19 $9.21 Y  Material Info PCN Purchase
AD8842AR Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $11.19 $10.10 N  Material Info PCN Purchase
AD8842ARZ Status: Production 24 ld SOIC - Wide 24 Ind Tube, 31 $10.19 $9.21 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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