Features LVDS/CMOS Outputs LVDS/CMOS/Crystal Clock Source with PLL Multiplication Integrated Flexible Spread Spectrum Clock Generation CDS or S/H Processing for CCD or CIS sensors Independent Gain/Offset Correction for Each Channel Automatic per-Channel Gain and Offset Calibration Programmable Input Clamp Voltage Flexible CCD/CIS Sensor Timing Generator Description The LM98722 is a fully integrated, high performance 16-Bit, 45 MSPS signal processing solution for digital color copiers, scanners, and other image processing applications. High-speed signal throughput is achieved with an innovative architecture utilizing Correlated Double Sampling (CDS), typically employed with CCD arrays, or Sample and Hold (S/H) inputs (for higher speed CCD or CMOS image sensors). The signal paths utilize 8 bit Programmable Gain Amplifiers (PGA), a +/-9-Bit offset correction DAC and independently controlled Digital Black Level correction loops for each input. The PGA and offset DAC are programmed independently allowing unique values of gain and offset for each of the three analog inputs. The signals are then routed to a 45MHz high performance analog-to-digital converter (ADC). The fully differential processing channel shows exceptional noise immunity, having a very low noise floor of -74dB. The 16-bit ADC has excellent dynamic performance making the LM98722 transparent in the image reproduction chain. A very flexible integrated Spread Spectrum Clock Generation (SSCG) modulator is included to assist with EM compliance and reduce system costs. Key Specification Maximum Input Level 1.2 or 2.4 Volt Modes (both with + or - polarity option) ADC Resolution 16-Bit ADC Sampling Rate 45 MSPS INL +18/-25 LSB (typ) Channel Sampling Rate 22.5/22.5/15 MSPS PGA Gain Steps 256 Steps PGA Gain Range 0.64 to 8.3x Analog DAC Resolution +/-9 Bits Analog DAC Range +/-307mV or +/-614mV Digital DAC Resolution +/-6 Bits Digital DAC Range -2048 LSB to + 2016 LSB SNR -74dB (@0dB PGA Gain) Power Dissipation 630mW (LVDS) Operating Temp 0 to 70°C Supply Voltage 3.3V Nominal (3.0V to 3.6V range) Applications Multi-Function Peripherals High-speed Currency/Check Scanners Flatbed or Handheld Color Scanners High-speed Document Scanners

Typical Application

Typical Application click for larger image Typical Application	Block Diagram click for larger image System Block Diagram

Datasheets

Title		Size	Date	Other Language
	LM98722 Three Channel, 16-Bit, 45 MSPS Analog Front End with LVDS/CMOS Output and Integrated CCD/CIS Sensor Timing Generator	464 Kbytes	24-Sep-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM98722CCMT/NOPB LM98722CCMT RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 34 DIGI-KEY Worldwide 52 MOUSER Worldwide 34	$11.00 each at 100+ pcs	rail of 34
LM98722CCMTX/NOPB RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$11.00 each at 100+ pcs	reel of 1000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM98722.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM98722 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM98722CCMT/NOPB LM98722CCMT	222.11 223	TSSOP	56	2 2	260 260	Detail	Download	N/A	NSUZXYTTE# LM98722CCMT
LM98722CCMTX/NOPB	222.11 223	TSSOP	56	2	260	Detail	Download	N/A	NSUZXYTTE# LM98722CCMT

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM98722.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM98722 is located at RoHS Status.

CAD Symbols and Models Download LM98722 CAD Symbols

Models N/A