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 ...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.

Features

  • 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

Diagrams

AD9761 Diagram
Functional Block Diagram for AD9761

Specifications

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 (Max) 250mW
Package SOP

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Part# Res (bits) Update Rate Settling Time # Outputs
AD9761 10 40MSPS 35ns 2
AD9763 10 125MSPS 35ns 2
AD9705 10 175MSPS 11ns 1
AD9740 10 210MSPS 11ns 1
ADV7122 10 80MSPS 12ns 3
ADV7123 10 330MSPS 15ns 3
ADV7127 10 240MSPS 15ns 1