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| Dual Channel 14-Bit CCD Signal Processor with V-Driver and Precision Timing Generator AD9928 FEATURES Registers similar to AD9920A and AD9990 Timing generator with 18-channel V-driver Serial data output with reduced range LVDS interface 1.8 V dual AFE core Internal LDO regulators for compatibility with 3 V systems Correlated double sampler (CDS) with -3 dB, 0 dB, +3 dB, and +6 dB gain 6 dB to 42 dB, 10-bit variable gain amplifier (VGA) 14-bit, 40 MHz analog-to-digital converter (ADC) Black level clamp with variable level control Precision Timing core with ~390 ps resolution at 40 MHz On-chip 3 V horizontal and RG drivers General-purpose outputs (GPOs) for shutter support On-chip driver for external crystal 128-ball CSP_BGA package, 9 mm x 9 mm, 0.65 mm pitch GENERAL DESCRIPTION The AD9928 is a highly integrated CCD signal processor for digital still camera applications. It includes a dual analog front end with analog-to-digital conversion, combined with a fullfunction programmable timing generator and 18-channel vertical driver (V-driver) for a 2-channel output CCD. The timing generator is capable of supporting up to 24 vertical clock signals internally, and the on-chip V-driver supports up to 18 high voltage outputs. A Precision TimingTM core allows adjustment of high speed clocks with approximately 390 ps resolution at 40 MHz operation. The AD9928 also contains eight generalpurpose outputs, which can be used for shutter and system functions. Each analog front end includes black level clamping, CDS, VGA, and a 14-bit ADC. The timing generator provides all the necessary CCD clocks: RG, H-clocks, V-clocks, sensor gate pulses, substrate clock, and substrate bias control. The AD9928 is specified over an operating temperature range of -25C to +85C. APPLICATIONS Digital still cameras Medical imaging Industrial cameras FUNCTIONAL BLOCK DIAGRAM REFT_A REFB_A REFT_B REFB_B -3dB, 0dB, +3dB, +6dB CCDIN_A CDS VGA 6dB TO 42dB -3dB, 0dB, +3dB, +6dB CCDIN_B LDO_IN LDO_OUT LDO_IN LDO_OUT RG_A, RG_B HL_A, HL_B 8 H1A TO H4A, H1B TO H4B 18 V1A TO V15 SUBCK VERTICAL DRIVER XV1 TO XV24 24 +3V +1.8V +3V +1.8V 2 HORIZONTAL DRIVERS CDS VGA 6dB TO 42dB AD9928 VREF_A 14-BIT ADC VREF_B 14 TCLKP TCLKN DOUT0P_A CLAMP 14 DOUT0N_A REDUCED RANGE LVDS OUTPUTS DOUT1P_A DOUT1N_A DOUT0P_B DOUT0N_B DOUT1P_B DOUT1N_B INTERNAL CLOCKS 14-BIT ADC LDO REG_A LDO REG_B CLAMP PRECISION TIMING GENERATOR SL INTERNAL REGISTERS SCK SDI XSUBCK VERTICAL TIMING CONTROL 7 SYNC GENERATOR GPO1 TO GPO7 HD VD SYNC CLI CLO RST Figure 1. For more information on the AD9928, email Analog Devices, Inc., at afe.ccd@analog.com. Rev. SpD 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: 781.461.3113 (c)2009 Analog Devices, Inc. All rights reserved. 08261-001 XSUBCNT (GPO8) AD9928 NOTES (c)2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08261F-0-10/09(SpD) Rev. SpD | Page 2 of 2 |
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