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Wolfson AFE targets flatbed scanners, multi-function peripherals

Posted: 10 Jul 2002 ?? ?Print Version ?Bookmark and Share

Keywords:wolfson microelectronics? wm8150? dac? digital analog converter? digital signal converter?

The WM8150 analog front end (AFE) from Wolfson Microelectronics Ltd works with CIS or CCD sensors at a pixel sample rate of up to 8MSa/s and is targeted for flatbed scanners, multi-function peripherals, and digital photocopier applications.

The 20-pin SSOP is designed to complete the signal path between the sensor and the digital processor. The path includes reset level clamping, correlated double sampling, and programmable gain and offset adjust functions.

The offset DAC and the programmable gain amplifier can be switched to different values using on-chip registers and MUXs to simplify the processing of line-by-line RGB color information. The amplifier is monotonic over its 8-bit range and provides an input voltage range of 0.3V to 3.22V.

Overall DNL is typically 0.5LSB, while INL is at 2LSB. The device uses either a single 5V supply rail of a 5V analog supply and a digital interface supply of either 5V or 3.3V. Current consumption is at 45mA but power down modes offer 1mA operation with all analog functions off, and 300mA in full power down mode.

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