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Fastest 14bit CMOS DAC

Steve Bush
Wednesday 08 February 2012 10:22

Fujitsu has announced its third generation 14bit CMOS DACs, claiming it to be the world's fastest at 12Gsample/s.

Dubbed MB86066, the part is aimed at cable modem and radio infrastructure.

In perhaps another world first, this DAC has a name: the firm has christened it 'Anakin'.

"Such performance is key to enabling true single-platform designs, capable of multi-band as well as multi-mode air interface agnostic signal synthesis," said Fujitsu. "Furthermore, its performance comfortably encompassing 50-1,000MHz, meets the needs of all downstream cable modem infrastructure applications."

The device integrates two cascaded x2 interpolation filters, reducing the input data required to 3Gsample/s for full-rate operation.

Input data is shared across two parallel LVDS buses, each operating at up to 1.5Gsample/s, 750MHz DDR.

Two further LVDS buses are available to support applications requiring 6Gsample/s input data.

Both interpolation filters can be configured for either low, high or all-pass operation, "providing multiple operating and power reduced modes", said the firm.

15bit interfaces are implemented to support continuous, per-sample parity checking with automatic error counting.

The device is housed in an 15x15mm 324-ball plastic flip-chip BGA package.

Power consumption is 2.2W at 12Gsample/s, with both filters enabled, reducing to 950mW at 5.3Gsample/s for cable modem applications.

To simplify initial device evaluation, as well as to provide in-system diagnostics, Fujitsu has included a waveform memory module (WMM) on the chip which can store test-vectors of up to 256k samples long.

Device configuration and control is achieved via a four-wire serial interface.

Development samples are currently undergoing characterisation and qualification testing, with production-ready devices scheduled for Q4 2012.

For ASICs, the DAC core intellectual property - which also has a name, it is called 'Jacen' - can be licensed for incorporation using Fujitsu's 65nm CS200L CMOS process.

 

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