AD9765 12-Bit, 125 MSPS Dual TxDAC+® Digital-to-Analog Converter

The AD9763/AD9765/AD9767 are dual-port, high speed, 2-channel, 10-/12-/14-bit CMOS DACs. Each part integrates two high quality TxDAC+® cores, a voltage reference, and digital interface circuitry into a small 48-lead LQFP. The AD9763/ AD9765/AD9767 offer exceptional ac and dc performance while supporting update rates of up to 125 MSPS. The AD9763/AD9765/AD9767 are members of a pin- compatible family of dual TxDACs providing 8-, 10-, 12-, and 14-bit resolution. Dual 10-/12-/14-Bit, 125 MSPS DACs. A pair of high performance DACs for each part is optimized for low distortion performance and provides flexible transmission of I and Q information. Matching. Gain matching is typically 0.1% of full scale, and offset error is better than 0.02%. Low Power. Complete CMOS dual DAC function operates on 380 mW from a 3.3 V to 5 V single supply. The DAC full-scale current can be reduced for lower power operation, and a sleep mode is provided for low power idle periods. On-Chip Voltage Reference. The AD9763/AD9765/AD9767 each include a 1.20 V temperature-compensated band gap voltage reference. Dual 10-/12-/14-Bit Inputs. The AD9763/AD9765/AD9767 each feature a flexible dual-port interface, allowing dual or interleaved input data. Communications Base stations Digital synthesis Quadrature modulation 3D ultrasound

The AD9763/AD9765/AD9767 have been optimized for processing I and Q data in communications applications. The digital interface consists of two double-buffered latches as well as control logic. Separate write inputs allow data to be written to the two DAC ports independent of one another. Separate clocks control the update rate of the DACs.

A mode control pin allows the AD9763/AD9765/AD9767 to interface to two separate data ports, or to a single interleaved high speed data port. In interleaving mode, the input data stream is demuxed into its original I and Q data and then latched. The I and Q data is then converted by the two DACs and updated at half the input data rate.

The GAINCTRL pin allows two modes for setting the full-scale current (IOUTFS) of the two DACs. IOUTFS for each DAC can be set independently using two external resistors, or IOUTFS for both DACs can be set by using a single external resistor. See the Gain Control Mode section for important date code information on this feature.

The DACs utilize a segmented current source architecture combined with a proprietary switching technique to reduce glitch energy and maximize dynamic accuracy. Each DAC provides differential current output, thus supporting single-ended or differential applications. Both DACs of the AD9763, AD9765, or AD9767 can be simultaneously updated and can provide a nominal full-scale current of 20 mA. The full-scale currents between each DAC are matched to within 0.1%.

The AD9763/AD9765/AD9767 are manufactured on an advanced, low cost CMOS process. They operate from a single supply of 3.3 V to 5 V and consume 380 mW of power.

Product Highlights
  • The AD9763/AD9765/AD9767 are members of a pin- compatible family of dual TxDACs providing 8-, 10-, 12-, and 14-bit resolution.
  • Dual 10-/12-/14-Bit, 125 MSPS DACs. A pair of high performance DACs for each part is optimized for low distortion performance and provides flexible transmission of I and Q information.
  • Matching. Gain matching is typically 0.1% of full scale, and offset error is better than 0.02%.
  • Low Power. Complete CMOS dual DAC function operates on 380 mW from a 3.3 V to 5 V single supply. The DAC full-scale current can be reduced for lower power operation, and a sleep mode is provided for low power idle periods.
  • On-Chip Voltage Reference. The AD9763/AD9765/AD9767 each include a 1.20 V temperature-compensated band gap voltage reference.
  • Dual 10-/12-/14-Bit Inputs. The AD9763/AD9765/AD9767 each feature a flexible dual-port interface, allowing dual or interleaved input data.

Features and Benefits
  • 10-/12-/14-bit dual transmit digital-to-analog converters (DACs)
  • 125 MSPS update rate
  • Excellent SFDR to Nyquist @ 5 MHz output: 75 dBc
  • Excellent gain and offset matching: 0.1%
  • Fully independent or single-resistor gain control
  • Dual-port or interleaved data
  • On-chip 1.2 V reference
  • 5 V or 3.3 V operation
  • Power dissipation: 380 mW @ 5 V
  • Power-down mode: 50 mW @ 5 V
  • 48-lead LQFP
  • Digital to Analog Converters
    AD9765 IBIS Models
    Data Sheets
    Documentnote
    AD9763/AD9765/AD9767: 10-/12-/14-Bit, 125 MSPS Dual TxDAC+ Digital-to-Analog Converters Data Sheet (Rev. G)PDF 2690 kB
    Application Notes
    Documentnote
    AN-237: Choosing DACs for Direct Digital SynthesisPDF 1156 kB
    AN-595: Understanding Pin Compatibility in the TxDAC® Line of High Speed D/A Converters (Rev. 0)PDF 36 kB
    AN-348: Avoiding Passive-Component PitfallsPDF 931 kB
    AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC (Rev. 0)PDF 246 kB
    AN-320A: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifier, Part 1PDF 1295 kB
    AN-555: Using the AD9709, AD9763, AD9765, AD9767 Dual DAC Evaluation Board (Rev. 0)PDF 206 kB
    AN-137: A Digitally Programmable Gain and Attenuation Amplifier DesignPDF 52 kB
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD9765AST Production48 ld LQFPOTH 250-40 to 85C15.1612.88N
    AD9765ASTRL Production48 ld LQFPREEL 2000-40 to 85C012.88N
    AD9765ASTZ Production48 ld LQFPOTH 250-40 to 85C12.510.63Y
    AD9765ASTZRL Production48 ld LQFPREEL 2000-40 to 85C010.63Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    AD9765-EBZEvaluation Board303.6Y
    Reference Materials
    AD9763/AD9765/AD9767: 10-/12-/14-Bit, 125 MSPS Dual TxDAC+ Digital-to-Analog Converters Data Sheet (Rev. G) ad9763
    AD9765AST 3V ad9765
    AD9765AST 5V ad9765
    AN-237: Choosing DACs for Direct Digital Synthesis ad9856
    AN-595: Understanding Pin Compatibility in the TxDAC® Line of High Speed D/A Converters (Rev. 0) ad9760
    AN-348: Avoiding Passive-Component Pitfalls ad7813
    AN-348: 避开无源元件的陷阱 adg901
    AN-237: 放大器直接数字频率合成的DAC选型器应用漫谈 (Rev. 0) ad9540
    AN-912: 用平衡电流输出DAC驱动中心抽头变压器[中文版] (Rev. 0) ad7524
    AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC (Rev. 0) ad7524
    AN-320A: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifier, Part 1 ad7524
    AN-595: 了解TxDAC®系列高速DAC的引脚兼容性[中文版] (Rev. 0) ad9760
    AN-555: Using the AD9709, AD9763, AD9765, AD9767 Dual DAC Evaluation Board (Rev. 0) ad9763
    AN-137: A Digitally Programmable Gain and Attenuation Amplifier Design ad7524
    Digital to Analog Converters ICs Solutions Bulletin ad5590