LM98620 10-bit 70 MSPS 6 Channel Imaging Signal Processor with LVDS Output General Description The LM98620 is a fully integrated, 10-Bit, 70 MSPS signal processing solution for high performance digital color copiers, scanners, and other image processing applications. Highspeed signal throughput is achieved with an innovative six channel architecture utilizing Correlated Double Sampling (CDS), or Sample and Hold (SH) type sampling. 1x or 2x gain settings are available in the CDS/SH input stage. Each channel has a dedicated 1x to 10x (8 bit) PGA that allows accurate gain adjustment of each channel. The Digital White Level auto calibration loop can automatically set the PGA value to achieve a selected white target level. Each channel also has a ±4 bit coarse and ±10-bit fine analog offset correction DAC that allows offset correction before the sample-and-hold amplifier. These correction values can be controlled by an automated Digital Black Level correction loop. The PGA and offset DACs for each channel are programmed independently allowing unique values of gain and offset for each of the six channels. A 2-to-1 multiplexing scheme routes the signals to three 70MHz high performance ADCs. The fully differential processing channels achieve exceptional noise immunity, having a very low noise floor of -68.5dB. The 10-bit analogto-digital converters have excellent dynamic performance making the LM98620 transparent in the image reproduction chain. Features ■ ■ ■ ■ 3.3V Single Supply Operation CDS or S/H Processing 35 MHz Channel Rate Enhanced ESD Protection on Timing, Control and LVDS Pins ■ ■ ■ ■ ■ ■ ■ ■ Low Power CMOS Design 12 pin to 16 pin (selectable) LVDS serialized data output 4-Wire Serial interface 2 Channel Symmetrical Architecture Independent Gain and Offset Correction for each Channel Digital Black Level Calibration for each Channel Digital White Level Calibration for each Channel Programmable Input Clamp Key Specifications ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Maximum Input Level Input Sample Rate PGA Gain Range CDS/SH Gain Settings Total Channel Gain PGA Gain Resolution ADC Resolution ADC Sampling Rate SNR Offset DAC Range Offset DAC Resolution Supply voltage Power Dissipation 1.2 Vp-p (CDS gain = 1.0) 0.58 Vp-p (CDS gain = 2.0) 5 to 35 MSPS - 6ch mode 10 to 35 MSPS - 3ch mode 1x to 10x (0 to 20 dB) 1x or 2.1x 1x to 21x (0 to 26 dB) 8 bits - Analog 10 bits 10 to 70 MSPS 68.5 dB (Gain = 1x) ±111 mV or ±59.5 mV- FDAC ±281 mV - CDAC ±10 bits - FDAC ±4 bits - CDAC 3.0V to 3.6V 1.02 W (typical) System Block Diagram 30032304 © 2008 National Semiconductor Corporation 300323 www.national.com LM98620 10-bit 70 MSPS 6 Channel Imaging Signal Processor with LVDS Output February 21, 2008 LM98620 Chip Block Diagram 30032301 www.national.com 2 LM98620 Channel Block Diagram 30032302 Ordering Information Commercial Temperature Range NS Package LM98620VHB 80-Pin TQFP 3 www.national.com LM98620 www.national.com 4 LM98620 Physical Dimensions inches (millimeters) unless otherwise noted 80-Lead TQFP NS Package Number VHB80A 5 www.national.com LM98620 10-bit 70 MSPS 6 Channel Imaging Signal Processor with LVDS Output Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH www.national.com/webench Audio www.national.com/audio Analog University www.national.com/AU Clock Conditioners www.national.com/timing App Notes www.national.com/appnotes Data Converters www.national.com/adc Distributors www.national.com/contacts Displays www.national.com/displays Green Compliance www.national.com/quality/green Ethernet www.national.com/ethernet Packaging www.national.com/packaging Interface www.national.com/interface Quality and Reliability www.national.com/quality LVDS www.national.com/lvds Reference Designs www.national.com/refdesigns Power Management www.national.com/power Feedback www.national.com/feedback Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www.national.com/led PowerWise www.national.com/powerwise Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors Wireless (PLL/VCO) www.national.com/wireless THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS. EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright© 2008 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Technical Support Center Email: [email protected] Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Technical Support Center Email: [email protected] German Tel: +49 (0) 180 5010 771 English Tel: +44 (0) 870 850 4288 National Semiconductor Asia Pacific Technical Support Center Email: [email protected] National Semiconductor Japan Technical Support Center Email: [email protected]