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AD9709-EB Datasheet(PDF) 1 Page - Analog Devices |
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AD9709-EB Datasheet(HTML) 1 Page - Analog Devices |
1 / 27 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD9709* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 8-Bit, 125 MSPS Dual TxDAC+® D/A Converter PRODUCT DESCRIPTION The AD9709 is a dual-port, high-speed, two-channel, 8-bit CMOS DAC. It integrates two high-quality 8-bit TxDAC+ cores, a voltage reference, and digital interface circuitry into a small 48-lead LQFP package. The AD9709 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS. The AD9709 has 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 AD9709 to interface to two sep- arate 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 using a single external resistor. 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 can be simultaneously updated and provide a nominal full-scale current of 20 mA. The full-scale currents between each DAC are matched to within 0.1%. The AD9709 is manufactured on an advanced low-cost CMOS process. It operates from a single supply of 3.0 V to 5.0 V and consumes 380 mW of power. PRODUCT HIGHLIGHTS 1. The AD9709 is a member of a pin-compatible family of dual TxDACs providing 8-, 10-, 12-, and 14-bit resolution. 2. Dual 8-Bit, 125 MSPS DACs: A pair of high-performance DACs optimized for low-distortion performance provide for flexible transmission of I and Q information. 3. Matching: Gain matching is typically 0.1% of full-scale, and offset error is better than 0.02%. 4. Low Power: Complete CMOS Dual DAC function operates on 380 mW from a 3.0 V to 5.0 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. 5. On-Chip Voltage Reference: The AD9709 includes a 1.20 V temperature-compensated bandgap voltage reference. 6. Dual 8-Bit Inputs: The AD9709 features a flexible dual-port interface allowing dual or interleaved input data. FEATURES 8-Bit Dual Transmit DAC 125 MSPS Update Rate Excellent SFDR to Nyquist @ 5 MHz Output = 66 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 Single 5 V or 3 V Supply Operation Power Dissipation: 380 mW @ 5 V Power-Down Mode: 50 mW @ 5 V 48-Lead LQFP APPLICATIONS Communications Basestations Digital Synthesis Quadrature Modulation 3D Ultrasound FUNCTIONAL BLOCK DIAGRAM “1” LATCH “1” DAC REFIO FSADJ1 FSADJ2 GAINCTRL REFERENCE BIAS GENERATOR IOUTA1 IOUTB1 SLEEP IOUTA2 IOUTB2 DIGITAL INTERFACE AD9709 PORT1 PORT2 WRT1 WRT2 DVDD DCOM AVDD ACOM CLK1 CLK2 MODE “2” DAC “2” LATCH TxDAC+ is a registered trademark of Analog Devices, Inc. *Patent pending. |
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