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AD9822JRS
Complete 14-Bit CCD/CIS Signal Processor AD9822 FEATURES GENERAL DESCRIPTION 14-bit 15 MSPS ADC No missing codes guaranteed 3-channel operation up to 15 MSPS 1-channel operation up to 12.5 MSPS Correlated double sampling 1–6× programmable gain ±350 mV programmable offset Input clamp circuitry Internal voltage reference Multiplexed byte-wide output (8 + 6 format) 3-wire serial digital interface 3 V/5 V digital I/O compatibility 28-Lead SOIC or SSOP Low power CMOS: 385 mW (typ) Power-down mode: <1 mW The AD9822 is a complete analog signal processor for CCD imaging applications. It features a 3-channel architecture designed to sample and condition the outputs of trilinear color CCD arrays. Each channel consists of an input clamp, correlated double sampler (CDS), offset DAC, and programmable gain amplifier (PGA) multiplexed to a high performance 14-bit ADC. The CDS amplifiers may be disabled for use with sensors such as contact image sensors (CIS) and CMOS active pixel sensors, which do not require CDS. The 14-bit digital output is multiplexed into an 8-bit output word that is accessed using two read cycles. The internal registers are programmed through a 3-wire serial interface and provide adjustment of the gain, offset, and operating mode. The AD9822 operates from a single 5 V power supply, consumes 385 mW of power typically, and is packaged in a 28-lead SOIC or SSOP. APPLICATIONS Flatbed document scanners Film scanners Digital color copiers Multifunction peripherals FUNCTIONAL BLOCK DIAGRAM VINR AVSS CML CDS CAPT CAPB AVDD CDS 14:8 MUX 8 MUX REGISTER PGA INPUT CLAMP BIAS 14 DOUT CONFIGURATION REGISTER 6 CDSCLK1 14-BIT ADC 3:1 MUX 9-BIT DAC OFFSET OEB BAND GAP REFERENCE PGA CDS DRVSS AD9822 9-BIT DAC VINB DRVDD PGA 9-BIT DAC VING AVSS 9 RED GREEN BLUE RED GREEN BLUE CDSCLK2 SCLK DIGITAL CONTROL INTERFACE GAIN REGISTERS SLOAD SDATA OFFSET REGISTERS ADCCLK 00623-001 AVDD Figure 1. Rev. B 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. Specifications subject to change without notice. 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: 781.326.8703 © 2005 Analog Devices, Inc. All rights reserved.
AD
Analog Devices
U.S.A
半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。
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