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AD9761:  10-Bit, Complete, 40 MSPS, dual Transmit D/A Converter

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 ...More

AD9761:  10-Bit, Complete, 40 MSPS, dual Transmit D/A Converter

Product Description

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.

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  • Complete 10-Bit, 40 MSPS Dual Transmit DAC
  • Excellent Gain and Offset Matching
  • Differential Nonlinearity Error: 0.5 LSB
  • Effective Numbe of Bits: 9.5
  • Signal-to-Noise and Distortion Ratio: 59 dB
  • Spurious-Free Dynamic Range: 71 dB
  • 2x Interpolation Filters
  • 20 MSPS/Channel Data Rate
  • Single Supply: 3V to 5.5 V
  • Low Power Dissipation: 93 mW
    (3 V Supply @ 40 MSPS)
  • On-Chip Reference
  • 28-Lead SSOP
  • Resolution (Bits): 10bit
  • DAC Update Rate: 40MSPS
  • DAC Settling Time: 35ns
  • # DAC Outputs: 2
  • DAC Type: Current Out
  • DAC Input Format: Par
  • Output FSR: (Iout x Rload),Adj(Uni 2mA to Uni 20mA),User Def. Range/Offset
  • Ref Int/Ext: Int/Ext
  • Supply Vnom: Single(+5)
  • Pwr Diss: 250mW
  • Package: SOP

Functional Block Diagram for AD9761

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AD9761 10 40MSPS 35ns 2
AD9751 10 300MSPS 11ns 1
AD9750 10 125MSPS 35ns 1
AD9740 10 210MSPS 11ns 1
AD9705 10 175MSPS 11ns 1
ADV7127 10 240MSPS 15ns 1
ADV7122 10 80MSPS 12ns 3
ADV7123 10 330MSPS 15ns 3
ADV7128 10 80MSPS 12ns 1
AD9760 10 125MSPS 35ns 1
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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.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.