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AD9281 Datasheet(PDF) 1 Page - Analog Devices |
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AD9281 Datasheet(HTML) 1 Page - Analog Devices |
1 / 15 page AD9281 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: 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 Dual Channel 8-Bit Resolution CMOS ADC FEATURES Complete Dual Matching ADC Low Power Dissipation: 225 mW (+3 V Supply) Single Supply: 2.7 V to 5.5 V Differential Nonlinearity Error: 0.1 LSB On-Chip Analog Input Buffers On-Chip Reference Signal-to-Noise Ratio: 49.2 dB Over Seven Effective Bits Spurious-Free Dynamic Range: –65 dB No Missing Codes Guaranteed 28-Lead SSOP FUNCTIONAL BLOCK DIAGRAM 1V REFERENCE BUFFER QREFB IREFB QREFT IREFT VREF REFSENSE IINA IINB "I" ADC QINB QINA "Q" ADC Q REGISTER I REGISTER THREE- STATE OUTPUT BUFFER AVDD AVSS CLOCK DVDD DVSS SLEEP SELECT DATA 8 BITS CHIP SELECT AD9281 ASYNCHRONOUS MULTIPLEXER PRODUCT DESCRIPTION The AD9281 is a complete dual channel, 28 MSPS, 8-bit CMOS ADC. The AD9281 is optimized specifically for applica- tions where close matching between two ADCs is required (e.g., I/Q channels in communications applications). The 28 MHz sampling rate and wide input bandwidth will cover both narrow- band and spread-spectrum channels. The AD9281 integrates two 8-bit, 28 MSPS ADCs, two input buffer amplifiers, an internal voltage reference and multiplexed digital output buffers. Each ADC incorporates a simultaneous sampling sample-and- hold amplifier at its input. The analog inputs are buffered; no external input buffer op amp will be required in most applica- tions. The ADCs are implemented using a multistage pipeline architecture that offers accurate performance and guarantees no missing codes. The outputs of the ADCs are ported to a multi- plexed digital output buffer. The AD9281 is manufactured on an advanced low cost CMOS process, operates from a single supply from 2.7 V to 5.5 V, and consumes 225 mW of power (on 3 V supply). The AD9281 input structure accepts either single-ended or differential signals, providing excellent dynamic performance up to and beyond 14 MHz Nyquist input frequencies. PRODUCT HIGHLIGHTS 1. Dual 8-Bit, 28 MSPS ADC A pair of high performance 28 MSPS ADCs that are opti- mized for spurious free dynamic performance are provided for encoding of I and Q or diversity channel information. 2. Low Power Complete CMOS Dual ADC function consumes a low 225 mW on a single supply (on 3 V supply). The AD9281 operates on supply voltages from 2.7 V to 5.5 V. 3. On-Chip Voltage Reference The AD9281 includes an on-chip compensated bandgap voltage reference pin programmable for 1 V or 2 V. 4. On-chip analog input buffers eliminate the need for external op amps in most applications. 5. Single 8-Bit Digital Output Bus The AD9281 ADC outputs are interleaved onto a single output bus saving board space and digital pin count. 6. Small Package The AD9281 offers the complete integrated function in a compact 28-lead SSOP package. 7. Product Family The AD9281 dual ADC is pin compatible with a dual 10-bit ADC (AD9201). REV. F ©1999-2011 Analog Devices, Inc. All rights reserved. 781/461-3113 |
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