1 Features

1• 3.3-V Single Supply Operation

• CDS or S/H Processing with Negative Input Signal

Polarity

• 32.5-MHz Channel Rate

• Enhanced ESD Protection on Host Interface Pins:

SHP, SHD, CLPIN, BLKCLP, AGC_ONB, MCLK,

RESETB, SENB, SCLK, SDI, SDO

• Low Power CMOS Design

• 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

2 Applications

• Digital Color Copiers

• Scanners

• Image Processing Polarity applications

• Key Specifications

– Maximum Input Level:

– 1.19 Vp-p (CDS Gain = 1.0)

– 0.58 Vp-p (CDS Gain = 2.1)

– Input Sample Rate:

– 5 to 32.5 MSPS – 6ch Mode

– 10 to 32.5 MSPS – 3ch Mode

– PGA Gain Range: 1x to 10x (0 to 20 dB)

– CDS/SH Gain Settings: 1x or 2.1x

– Total Channel Gain: 1x to 20x (0 to 26 dB)

– PGA Gain Resolution: 8 Bits – Analog

– ADC Resolution: 10 Bits

– ADC Sampling Rate: 10 to 65 MSPS

– SNR: 67.5 dB (Gain = 1x)

– Offset DAC Range:

– ±111 mV or ±60 mV – FDAC

– ±277 mV – CDAC

– Offset DAC Resolution:

– ±10 Bits – FDAC

– ±4 Bits – CDAC

– Supply Voltage: 3.0 V to 3.6 V

– Power Dissipation: 1.04 W (Typical)

3 Description

The LM98519 is a fully integrated, high performance

10-Bit, 65 MSPS signal processing solution for digital color copiers, scanners, and other image processing

applications. High-speed 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 65-MHz high performance ADCs. The

fully differential processing channels achieve exceptional noise immunity, having a very low noise

floor of -67.5 dB. The 10-bit analog-to-digital

converters have excellent dynamic performance

making the LM98519 transparent in the image

reproduction chain.