描述 Description

The LM98714 is a fully integrated, high performance 16-Bit, 45 MSPS signal processingsolution for digital color copiers, scanners, and other image processing applications. High-speedsignal 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 Contact ImageSensors and 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 loopsfor each input. The PGA and offset DAC are programmed independently allowing unique values of gainand offset for each of the three inputs. The signals are then routed to a 45 MHz high performanceanalog-to-digital converter (ADC). The fully differential processing channel shows exceptionalnoise immunity, having a very low noise floor of –74dB. The 16-bit ADC has excellent dynamicperformance making the LM98714 transparent in the image reproduction chain.

特性 Features

? LVDS/CMOS Outputs
? CDS or S/H Processing for CCD or CIS Sensors
? Digital Black Level Correction Loop for Each Channel
? Flexible CCD/CIS Sensor Timing Generator
? Maximum Input Level: 1.2 or 2.4 Volt Modes
? ADC Resolution: 16-Bit
? INL: ±23 LSB (Typ)
? PGA Gain Steps: 256 Steps
? Analog DAC Resolution: ±9 Bits
? Digital DAC Resolution: ±6 Bits
? SNR: –74dB (at 0 dB PGA Gain)
? Operating Temp: 0 to 70°C
? Supply Voltage: 3.3 V Nominal (3.0 V to 3.6 VRange)