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AD7849:  Serial Input, 14-Bit/16-Bit DAC

Product Details


The AD7849 is a 14-bit/16-bit serial input multiplying DAC. The DAC architecture ensures excellent differential linearity performance, and monotonicity is guaranteed to 14 bits for the A grade and to 16 bits for all other grades over the specified temperature ranges. During power-up and power-down sequences (when the supply voltages are changing), the VOUT pin is clamped to 0 V via a low impedance path. To prevent the output of A3 being shorted to 0 V during this time, transmission gate G1 is also opened. These conditions are maintained until the power supplies stabilize and a valid word is written to the DAC register. At this time, G2 opens and G1 closes. Both transmission gates are also externally controllable via the Reset In (RST IN) control input. For instance, if the RST IN input is driven from a battery supervisor chip, then on power-off or during a brown out, the RST IN input will be driven low to open G1 and close G2. The DAC must be reloaded, with RST IN high, to reenable the output. Conversely, the on-chip voltage detector output (RST OUT) is also available to the user to control other parts of the system.

The AD7849 has a versatile serial interface structure and can be controlled over three lines to facilitate opto-isolator applications.

SDOUT is the output of the on-chip shift register and can be used in a daisy-chain fashion to program devices in the multichannel system. The DCEN (Daisy Chain Enable) input controls this function.

The BIN/COMP pin sets the DAC coding; with BIN/COMP set to 0, the coding is straight binary; and with it set to 1, the coding is 2s complement. This allows the user to reset the DAC to 0 V in both the unipolar and bipolar output ranges.

The part is available in a 20-pin DIP and 20-pin SOIC package.

FEATURES and BENEFITS

  • 14-Bit/16-Bit Multiplying DAC
  • Guaranteed Monotonicity
  • Output Control on Power-Up and Power-Down Internal or External Control
  • Versatile Serial Interface
  • DAC Clears to 0 V in Both
    Unipolar and Bipolar Output Ranges

Functional Block Diagram for AD7849

Documentation

Title Content Type File Type
AD7849: Serial Input, 14-Bit/16-Bit DAC Data Sheet  (Rev C, 03/2011) (pdf, 211 kB) Data Sheets 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

AD7849 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7834CNZ Status: Production 20 ld PDIP 20 Ind Tube, 18 - - Y  Material Info PDN Purchase
AD7849ANZ Status: Production 20 ld PDIP 20 Ind Tube, 18 $10.95 $9.31 Y  Material Info PCN Purchase
AD7849AR Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $12.27 $10.44 N  Material Info PCN Purchase
AD7849ARZ Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $10.63 $9.04 Y  Material Info PCN Purchase Sample
AD7849ARZ-REEL Status: Contact ADI 20 ld SOIC - Wide 20 Ind Reel, 1000 - $9.04 Y  Material Info PCN Purchase
AD7849BR Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $15.19 $12.98 N  Material Info PCN Purchase
AD7849BR-REEL Status: Last Time Buy 20 ld SOIC - Wide 20 Ind Reel, 1000 - $12.98 N  Material Info PCN/PDN Purchase
AD7849BRZ Status: Production 20 ld SOIC - Wide 20 Comm. Tube, 37 $13.16 $11.23 Y  Material Info PCN Purchase Sample
AD7849BRZ-REEL Status: Production 20 ld SOIC - Wide 20 Comm. Reel, 1000 - $11.23 Y  Material Info PCN Purchase
AD7849CNZ Status: Production 20 ld PDIP 20 Ind Tube, 18 $18.76 $15.95 Y  Material Info PCN Purchase
AD7849CR Status: Production 20 ld SOIC - Wide 20 Ind Tube, 37 $21.04 $17.88 N  Material Info PCN Purchase
AD7849CR-REEL Status: Production 20 ld SOIC - Wide 20 Ind Reel, 1000 - $17.88 N  Material Info PCN Purchase
AD7849CRZ Status: Production 20 ld SOIC - Wide 20 Comm. Tube, 37 $18.22 $15.48 Y  Material Info PCN Purchase
AD7849CRZ-REEL Status: Production 20 ld SOIC - Wide 20 Comm. Reel, 1000 - $15.48 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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