The TLC8188 is a highly-integrated monolithic analog signal processor/digitizer designed to interface the contact image sensor (CIS) and linear charge-coupled device (CCD) image sensors in scanner applications. The input of the TLC8188 allows direct connection to the CIS and direct ac coupling of the linear CCD. The TLC8188 performs all the analog processing functions necessary to maximize the dynamic range, correct various errors associated with the CIS and the linear CCD sensors, and then digitize the results with an on-chip analog-to-digital converter (ADC). The key components of the TLC8188 include: input clamp circuitry and a correlated double sampler (CDS), a programmable gain amplifier (PGA) with auto-cycling gain control, a programmable offset correction controlled by a digital-to-analog converter (DAC), a 10-bit, 4 MSPS pipeline ADC, a bidirectional parallel bus and a three-wire serial port for easy microprocessor interface, and internal reference voltages.