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AD9225ARS

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Complete 12-Bit, 25 MSPS Monolithic A/D Converter AD9225 FEATURES Monolithic 12-Bit, 25 MSPS ADC Low Power Dissipation: 280 mW Single 5 V Supply No Missing Codes Guaranteed Differential Nonlinearity Error: ؎0.4 LSB Complete On-Chip Sample-and-Hold Amplifier and Voltage Reference Signal-to-Noise and Distortion Ratio: 71 dB Spurious-Free Dynamic Range: –85 dB Out-of-Range Indicator Straight Binary Output Data 28-Lead SOIC 28-Lead SSOP Compatible with 3 V Logic GENERAL DESCRIPTION The AD9225 is a monolithic, single-supply, 12-bit, 25 MSPS analog-to-digital converter with an on-chip, high performance sample-and-hold amplifier and voltage reference. The AD9225 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy at 25 MSPS data rates, and guarantees no missing codes over the full operating temperature range. The AD9225 combines a low cost, high speed CMOS process and a novel architecture to achieve the resolution and speed of existing bipolar implementations at a fraction of the power consumption and cost. The input of the AD9225 allows for easy interfacing to both imaging and communications systems. With the device’s truly differential input structure, the user can select a variety of input ranges and offsets, including single-ended applications. The dynamic performance is excellent. The sample-and-hold amplifier (SHA) is well suited for both multiplexed systems that switch full-scale voltage levels in successive channels and sampling single-channel inputs at frequencies up to and well beyond the Nyquist rate. FUNCTIONAL BLOCK DIAGRAM CLK AVDD DRVDD SHA VINA MDAC1 GAIN = 16 VINB ADC CAPT 5 MDAC2 GAIN = 4 3 ADC 5 MDAC3 GAIN = 4 ADC 3 3 ADC 4 3 CAPB DIGITAL CORRECTION LOGIC VREF 12 OUTPUT BUFFERS OTR SENSE MODE SELECT 1V AD9225 REFCOM AVSS DRVSS BIT 1 (MSB) BIT 12 (LSB) CML A single clock input is used to control all internal conversion cycles. The digital output data is presented in straight binary output format. An out-of-range signal indicates an overflow condition that can be used with the most significant bit to determine low or high overflow. PRODUCT HIGHLIGHTS The AD9225 is fabricated on a very cost effective CMOS process. High speed precision analog circuits are combined with high density logic circuits. The AD9225 offers a complete, single-chip sampling, 12-bit, 25 MSPS analog-to-digital conversion function in 28-lead SOIC and SSOP packages. Low Power—The AD9225 at 280 mW consumes a fraction of the power presently available in monolithic solutions. On-Board Sample-and-Hold Amplifier (SHA)—The versatile SHA input can be configured for either single-ended or differential inputs. Out-of-Range (OTR)—The OTR output bit indicates when the input signal is beyond the AD9225’s input range. The AD9225’s wideband input, combined with the power and cost savings over previously available monolithics, suits applications in communications, imaging, and medical ultrasound. Single Supply—The AD9225 uses a single 5 V power supply, simplifying system power supply design. It also features a separate digital driven supply line to accommodate 3 V and 5 V logic families. The AD9225 has an on-board programmable reference. An external reference can also be chosen to suit the dc accuracy and temperature drift requirements of an application. Pin Compatibility—The AD9225 is pin compatible with the AD9220, AD9221, AD9223, and AD9224 ADCs. Rev. C 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 otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/461-3113 ©1998-2011 Analog Devices, Inc. All rights reserved.

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