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AD9761 Datasheet(PDF) 1 Page - Analog Devices |
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AD9761 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 24 page  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 that may result from its use. No license is granted by implication or oth- erwise under any patent or patent rights of Analog Devices.Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. AD9761 Dual 10-Bit TxDAC+® with 2 Interpolation Filters FEATURES 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 2 Interpolation Filters 20 MSPS/Channel Data Rate Single Supply: 3 V to 5.5 V Low Power Dissipation: 93 mW (3 V Supply @ 40 MSPS) On-Chip Reference 28-Lead SSOP FUNCTIONAL BLOCK DIAGRAM ACOM REFLO I DAC FSADJ IOUTA IOUTB WRITE INPUT SELECT INPUT DCOM DVDD CLOCK AD9761 2 LATCH I REFIO REFERENCE COMP1 COMP2 COMP3 BIAS GENERATOR QOUTA QOUTB 2 LATCH Q MUX CONTROL AVDD DAC DATA INPUTS (10 BITS) SLEEP Q DAC 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 2 interpolation filters, a voltage reference, and digi- tal input interface circuitry. The AD9761 supports a 20 MSPS per channel input data rate that is then interpolated by 2 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 2 digital interpolation filter that eases the reconstruction filter requirements. The interpo- lated output of each filter serves as the input of their respective 10-bit DAC. The DACs utilize a segmented current source architecture com- bined 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 dif- ferential 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 3 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 band gap reference. PRODUCT HIGHLIGHTS 1. 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. 2. 2 Digital Interpolation Filters Dual matching FIR interpolation filters with 62.5 dB stop- band rejection precede each DAC input, thus reducing the DACs’ reconstruction filter requirements. 3. 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 opera- tion, and a sleep mode is provided for power reduction during idle periods. 4. On-Chip Voltage Reference The AD9761 includes a 1.20 V temperature-compensated band gap voltage reference. 5. 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 dif- ferent update rates. 6. Small Package The AD9761 offers the complete integrated function in a compact 28-lead SSOP package. 7. Product Family The AD9761 Dual Transmit DAC has a pair of Dual Receive ADC companion products, the AD9281 (8 bits) and AD9201 (10 bits). REV. C |
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Similar Description - AD9761_15 |
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