WM8144-12

WM8144-12 Production Data February 1998 Rev. 4.1 Integrated 12-bit Data Acquisition System for Imaging Applications Description Features WM8144-12 integrates the analogue signal conditioning required by CCD sensors with a 12-bit ADC and optional pixel-by-pixel image compensation. WM8144-12 requires minimal external circuitry and provides a cost effective sensor-to-digital domain system solution. Each analogue conditioning channel provides reset level clamp, CDS, fine offset level shifting and gain amplification. The three channels are multiplexed into the ADC. Output from the ADC can either be direct or passed through a digital post-processing function. The postprocessing provides compensation for variations in offset and shading on a pixel-by-pixel basis. Reset level clamp Correlated Double Sampling (CDS) Fine offset level shifting Programmable Gain Amplification 12-Bit ADC with maximum 4 MSPS Digital post-processing for pixel-by-pixel image compensation Simple clocking scheme Control by serial or parallel interface Time-multiplexed eight-bit data output mode 48 pin TQFP package Pin compatible with WM8144-10 The flexible output architecture allows twelve-bit data to be accessed either on a twelve-bit bus or via a timemultiplexed eight-bit bus. The WM8144-12 can be configured for pixel-by-pixel or line-by-line multiplexing operation. Reset level clamp and/or CDS features can be optionally bypassed. Device configuration is either by a simple serial...