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AD7249: LC2MOS Dual 12-Bit Serial DACPORT® Data Sheet (Rev. D)9/28/2006PDF149 kB
Alternative Parts
Overview
Features and Benefits
- Two 12-Bit CMOS DAC Channels with On-Chip Voltage Reference
- Three Selectable Output Ranges per Channel -5 V to + 5 V, 0 V to +5 V, 0 V to +10 V
Output Amplifiers
- Serial Interface
- 125 kHz DAC Update Rate
- Small Size: 16-Lead DIP or SOIC
- Low Power Dissipation
Product Details
The AD7249 DACPORT® contains a pair of 12-bit, voltage-output, digital-to-analog converters with output amplifiers and Zener voltage reference on a monolithic CMOS chip. No external trims are required to achieve full specified performance.
The output amplifiers are capable of developing +10 V across a 2 k Ω load. The output voltage ranges with single supply operation are 0 V to +5 V or 0 V to +10 V, while an additional bipolar ±5V output range is available with dual supplies. The ranges are selected using the internal gain resistor.
Interfacing to the AD7249 is serial, minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. The data stream consists of 16 bits, DB15 to DB13 are don't care bits, the 13th bit (DB12) is used as the channel select bit and the remaining 12 bits (DB11 to DB0) contain the data to update the DAC. The 16-bit data word is clocked into the input register on each falling SCLK edge.
The data format is natural binary in both unipolar ranges, while either offset binary or twos complement format may be selected in the bipolar range. A CLR function is provided which sets the output to 0 V in both unipolar ranges and in the twos complement bipolar range, while with offset binary data format, the output is set to -REFIN. This function is useful as a power-on reset as it allows the outputs to be set to a known voltage level.
The AD7249 features a serial interface which allows easy connection to both microcomputers and 16-bit digital signal processors with serial ports. The serial data may be applied at rates up to 2 MHz allowing a DAC update rate of 125 kHz.
The AD7249 is fabricated on linear compatible CMOS (LC2MOS), an advanced, mixed technology process. It is packaged in 16-pin DIP and 16-pin SOIC packages.
DACPORT is a registered trademark of Analog Devices, Inc.
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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.
Documentation & Resources
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AN-214: Ground Rules for High Speed Circuits2/14/2015PDF356 kB
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AN-348: Avoiding Passive-Component Pitfalls2/14/2015PDF931 kB
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AN-225: 12-Bit Voltage-Output DACs for Single-Supply 5V and 12V Systems1/1/2000PDF237 kB
Tools & Simulations
Precision DAC Error Budget Tool
The Precision DAC Error Budget Tool is a web application that calculates the DC Accuracy of precision DAC signal chains. It shows how the static errors accumulate throughout your signal chain to quickly evaluate the design tradeoffs. Calculations include the DC errors introduced by Voltage References, Operation Amplifiers and Precision DACs.
Design Resources
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.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| AD7249ANZ | Material Declaration | Reliability Data | 16-Lead PDIP | |
| AD7249ARZ | Material Declaration | Reliability Data | 16-Lead SOIC Wide | |
| AD7249ARZ-REEL | Material Declaration | Reliability Data | 16-Lead SOIC Wide | |
| AD7249BNZ | Material Declaration | Reliability Data | 16-Lead PDIP | |
| AD7249BRZ | Material Declaration | Reliability Data | 16-Lead SOIC Wide | |
| AD7249BRZ-REEL | Material Declaration | Reliability Data | 16-Lead SOIC Wide | |
| AD7249SQ | Material Declaration | Reliability Data | 16-Lead CerDIP | |
| Wafer Fabrication Data |
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