Speedy ADC aims for next generation photocopiers

A new, fast, pipeline A/D convertor is specifically designed for use in high speed next generation digital photocopier products.

A new, fast, pipeline A/D convertor is specifically designed for use in high speed next generation digital photocopier products.

Digital photocopiers typically use odd/even two output CCD sensors, either using one for monochrome operation or three for colour implementations.

Wolfson's new AFE is designed to be used on a one per sensor basis.

It may also find applications in very high speed flatbed scanners.

The new two-channel Wolfson WM8216 offers a 60Msample/s conversion rate, 10bit resolution, dual channel operation and correlated double sampling.

Power consumption is low at just 330mW typical.

It provides a highly integrated solution, integrating all of the major analogue signal conditioning and A/D conversion requirements of the interface between image sensor and the main digital architecture of a photocopier system onto a single mixed signal device.

This includes a 9bit programmable gain amplifier, and an internal 4bit DAC, for internal reference level generation, which may be used to reference CIS signals or clamp CCD signals.

Alternatively, an external reference may be supplied.

Both the analogue and digital parts of this device operate from a 3.3V supply.

"Digital photocopiers are sold in a growing and highly competitive market".

"Good system partitioning between analogue and digital parts of the architecture is vital and cost effective high speed data conversion is needed to keep performance up and costs down".

"The new WM8216 responds to these needs, giving designers the performance they require, within a highly integrated solution that remains straightforward to implement in their system", said David Milne, CEO of Wolfson.

The WM8216 is available in a 32-pin QFN package, priced at $3.73 in quantities of 10,000.

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