1 Features

1• Radiation Hardened

– TID 100 krad(Si)

– Single Event Latch-Up (SEL) Immune to LET =

120 MeV-cm2/mg

– Single Event Functional Interrupt (SEFI) Free

to 120 MeV-cm2/mg

– SMD 5962R1820301VXC

• ADC Resolution: 14-Bit

• ADC Sampling Rate: 5 MSPS to 40 MSPS

• Input Level: 2.85 V

• Supply Voltages 3.3 V and 1.8 V (Nominal)

– 125 mW per Channel at 15 MSPS

– 178 mW per Channel at 40 MSPS

• CDS or S/H Processing for CCD or CIS Sensors

– CDS or S/H Gain 0 dB or 6 dB

• Programmable Analog Gain for Each Channel

– 256 Steps; Range –3 dB to 18 dB

• Programmable Analog Offset Correction

– Fine and Coarse DAC Resolution ±8 Bits

– Fine DAC Range ±5 mV

– Coarse DAC Range ±250 mV

• Programmable Input Clamp Voltage

• Programmable Sample Edge: 1/64th Pixel Period

• INL at 15 MHz: ±3.5 LSB

• Noise Floor: –79 dB

• Crosstalk: –80 dB

• Operating Temp: –55°C to 125°C

2 Applications

• Space Satellites Scientific Applications

– Focal Plane Electronics

– Imaging Attitude Control Systems

– Earth Imaging

3 Description

The LM98640QML-SP is a fully integrated, high

performance 14-Bit, 5-MSPS to 40-MSPS signal

processing solution. The Serial LVDS output format

performs well during single event exposure,

preventing data loss. The LM98640QML-SP has an

adaptive power scaling feature to optimize power

consumption based on the operating frequency and

amount of gain required. 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 CIS and CMOS image sensors). The

sampling edges are programmable to a resolution of

1/64th of a pixel period. Both the CDS and S/H have

a programmable gain of either 0 dB or 6 dB. The

signal paths utilize two ±8-bit offset correction DACs

for coarse and fine offset correction, and 8-bit

Programmable Gain Amplifiers (PGA) that can be

programmed independently for each input. The

signals are then routed to two on chip 14-bit 40-MHz

high performance analog-to-digital converters (ADC).

The fully differential processing channel provides

exceptional noise immunity, having a very low noise

floor of –79 dB at 1x gain.