LM98640QML-SP - Dual channel, 14-bit, 40 MSPS analog front end with LVDS output

The LM98640QML-SP is a fully integrated, high performance 14-Bit, 5-MSPS to 40-MSPSsignal processing solution. The Serial LVDS output format performs well during single eventexposure, preventing data loss. The LM98640QML-SP has an adaptive power scaling feature to optimizepower consumption based on the operating frequency and amount of gain required. High-speed signalthroughput 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 imagesensors). The sampling edges are programmable to a resolution of 1/64th of a pixel period. Both theCDS and S/H have a programmable gain of either 0 dB or 6 dB. The signal paths utilize two ±8-bitoffset correction DACs for coarse and fine offset correction, and 8-bit Programmable GainAmplifiers (PGA) that can be programmed independently for each input. The signals are then routedto two on chip 14-bit 40-MHz high performance analog-to-digital converters (ADC). The fullydifferential processing channel provides exceptional noise immunity, having a very low noise floorof –79 dB at 1x gain.

• 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

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