1 Features

? 16-bit, single channel 250 and 500MSPS ADC

? Noise spectral density: ?160.4dBFS/Hz

? Thermal Noise: 76.4dBFS

? Single core (non-interleaved) ADC architecture

? Power consumption:

– 435mW (500MSPS)

– 369mW (250MSPS)

? Aperture jitter: 75fs

? Buffered analog inputs

– Programmable 100Ω and 200Ω termination

? Input fullscale: 2VPP

? Full power input bandwidth (?3dB): 1.4GHz

? Spectral performance (fIN = 70MHz, ?1dBFS):

– SNR: 75.6dBFS

– SFDR HD2,3: 80dBc

– SFDR worst spur: 94dBFS

? INL: ±2 LSB (typical)

? DNL: ±0.5 LSB (typical)

? Digital down-converters (DDCs)

– Up to four independent DDCs

– Complex and real decimation

– Decimation: /2, /4 to /32768 decimation

– 48-bit NCO phase coherent frequency hopping

? Parallel/ Serial LVDS interface

– 16-bit Parallel SDR, DDR LVDS for DDC

bypass

– Serial LVDS for decimation

– 32-bit output option for high decimation

2 Applications

? Software defined radio

? Spectrum analyzer

? Radar

? Spectroscopy

? Power amplifier linearization

? Communications infrastructure

3 Description

The ADC3568 and ADC3569 (ADC356x) are 16-bit,

250MSPS and 500MSPS, single channel analog to

digital converters (ADC). The devices are designed

for high signal-to-noise ratio (SNR) and deliver a

noise spectral density of -160dBFS/Hz (500MSPS).

The power efficient ADC architecture consumes

435mW at 500MSPS and provides power scaling with

lower sampling rates (369mW at 250MSPS).

The ADC356x includes an optional quad band

digital down-converter (DDC) supporting wide band

decimation by 2 to narrow band decimation by 32768.

The DDC uses a 48-bit NCO which supports phase

coherent and phase continuous frequency hopping.

The ADC356x is outfitted with a flexible LVDS

interface. In decimation bypass mode, the device

uses a parallel SDR or DDR LVDS interface. When

using decimation, the output data is transmitted using

a serial LVDS interface reducing the number of lanes

needed as decimation increases. For high decimation

ratios, the output resolution can be increased to 32-

bit.