Features and Benefits
- Complete 10-Bit, 40 MSPS Dual Transmit DAC
- Excellent Gain and Offset Matching
- Differential Nonlinearity Error: 0.5 LSB
- Effective Number of Bits: 9.5
- Signal-to-Noise and Distortion Ratio: 59 dB
- Spurious-Free Dynamic Range: 71 dB
- 2x Interpolation Filters
- See datasheet for additional features
The AD9761 is a complete dual channel, high speed, 10-bit CMOS DAC. The AD9761 has been developed specifically for use in wide bandwidth communication applications (e.g., spread spectrum) where digital I and Q information is being processed during transmit operations. It integrates two 10-bit, 40 MSPS DACs, dual 2x interpolation filters, a voltage reference, and digital input interface circuitry. The AD9761 supports a 20 MSPS per channel input data rate that is then interpolated by 2x up to 40 MSPS before simultaneously updating each DAC.
The interleaved I and Q input data stream is presented to the digital interface circuitry, which consists of I and Q latches as well as some additional control logic. The data is de-interleaved back into its original I and Q data. An on-chip state machine ensures the proper pairing of I and Q data. The data output from each latch is then processed by a 2x digital interpolation filter that eases the reconstruction filter requirements. The interpolated output of each filter serves as the input of their respective 10-bit DAC.
The DACs utilize a segmented current source architecture combined with a proprietary switching technique to reduce glitch energy and to maximize dynamic accuracy. Each DAC provides differential current output thus supporting single-ended or differential applications. Both DACs are simultaneously updated and provide a nominal full-scale current of 10 mA. Also, the full-scale currents between each DAC are matched to within 0.07 dB (i.e., 0.75%), thus eliminating the need for additional gain calibration circuitry.
The AD9761 is manufactured on an advanced low cost CMOS process. It operates from a single supply of 2.7 V to 5.5 V and consumes 200 mW of power. To make the AD9761 complete it also offers an internal 1.20 V temperature-compensated bandgap reference.
- Dual 10-Bit, 40 MSPS DACs
A pair of high performance 40 MSPS DACs optimized for low distortion performance provide for flexible transmission of I and Q information.
- 2x Digital Interpolation Filters
Dual matching FIR interpolation filters with 62.5 dB stopband rejection precede each DAC input, thus reducing the DACs’ reconstruction filter requirements.
- Low Power
Complete CMOS dual DAC function operates on a low 200 mW on a single supply from 3 V to 5.5 V. The DAC full-scale current can be reduced for lower power operation, and a sleep mode is provided for power reduction during idle periods.
- On-Chip Voltage Reference
The AD9761 includes a 1.20 V temperature-compensated band gap voltage reference.
- Single 10-Bit Digital Input Bus
The AD9761 features a flexible digital interface that allows each DAC to be addressed in a variety of ways including different update rates.
- Small Package
The AD9761 offers the complete integrated function in a compact 28-lead SSOP package.
- Product Family
The AD9761 Dual Transmit DAC has a pair of Dual Receive ADC companion products, the AD9281 (8 bits) and AD9201 (10 bits).
Product Lifecycle 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.
Evaluation Kits (1)
Documentation & Resources
AN-237: Choosing DACs for Direct Digital Synthesis2/14/2015
AN-595: Understanding Pin Compatibility in the TxDAC® Line of High Speed D/A Converters (Rev. 0)2/14/2015
AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC (Rev. 0)5/21/2007
AN-320A: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifier, Part 110/15/2004
AN-302: Exploit Digital Advantages in an SSB Receiver1/1/2000
Tools & Simulations
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.
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