1 Features
1• 3.3 V 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 Terminal to 16 Terminal (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:
– 1.2 Vp-p (CDS Gain = 1.0)
– 0.58 Vp-p (CDS Gain = 2.1)
– Input Sample Rate:
– 5 to 35 MSPS - 6ch mode
– 10 to 35 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 21x (0 to 26 dB)
– PGA Gain Resolution: 8 bits - Analog
– ADC Resolution: 10 bits
– ADC Sampling Rate: 10 to 70 MSPS
– SNR: 68.5 dB (Gain = 1x)
– Offset DAC Range:
– ±111 mV or ±59.5 mV - FDAC
– ±281 mV - CDAC
– Offset DAC Resolution:
– ±10 bits - FDAC
– ±4 bits - CDAC
– Supply Voltage: 3.0 V to 3.6 V
– Power Dissipation: 1.02 W (typical)

2 Applications
• High Performance Digital Color Copiers
• Scanners
• Other Image Processing Applications

3 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. High-speed signal throughput is
achieved with an innovative six channel architecture
utilizing Correlated Double Sampling (CDS), or
Sample and Hold (SH) type sampling. Gain settings of 1x or 2x are available in the CDS/SH input stage.
Each channel has a dedicated 1x to 10x (8 bit) PGA
that allows accurate gain adjustment. 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 70
MHz high performance ADCs. The fully differential
processing channels achieve exceptional noise
immunity, having a very low noise floor of –68.5dB.
The 10-bit analog-to-digital converters have excellent dynamic performance, making the LM98620
transparent in the image reproduction chain.