AD7849

Serial Input, 14-Bit/16-Bit DAC
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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.

Product Lifecycle

checked Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

AD7849 Material Declaration
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Overview

2 Reviews
2 out of 2 (100%) customers recommend this product.
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Most Helpful Review

by sele
The chip performed correctly and as expected. The students could complete their project in due time and according the specifications.

Most Recent Review

by Sammy
There are not alot of 16-bit DACs that are still available in the now huge SO package, but this one is. Alot easier to work with than DFN for prototypes. The C version of the AD7849 performed very good in a digital attenuation circuit. Because of digital feedtrough I had to add an output filter, but this was expected. Linearity and accuracy were both more than adequate for my setup and the AD7849 was easy to interface The AD7849 has the lowest cost for all my requirements (true 16-bit performance, high linearity, external reference pin, serial interface), but it will still be one of the more expensive parts in your system. Just beware that only the B and C versions provide 16-bit resolution.

All Reviews

by Sammy, 8 Apr 14
Excellent for digital attenuation
There are not alot of 16-bit DACs that are still available in the now huge SO package, but this one is. Alot easier to work with than DFN for prototypes. The C version of the AD7849 performed very good in a digital attenuation circuit. Because of digital feedtrough I had to add an output filter, but this was expected. Linearity and accuracy were both more than adequate for my setup and the AD7849 was easy to interface The AD7849 has the lowest cost for all my requirements (true 16-bit performance, high linearity, external reference pin, serial interface), but it will still be one of the more expensive parts in your system. Just beware that only the B and C versions provide 16-bit resolution.
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by sele, 10 Dec 13
Use of ADI ADC
The chip performed correctly and as expected. The students could complete their project in due time and according the specifications.
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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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