Dual 12-bit 65MSPS ADC With Serialized LVDS Output

ADS6225 ADS6224 ADS6223 ADS6222 (ADS622X) is a family of high performance 12-bit 125/105/80/65 MSPS dual channel A-D converters. Serial LVDs data outputs reduce the number of Interface lines, resulting in a compact 48-pin QFN package (7 mm 7 mm) that allows for high system integration density. The device includes 3.5 dB coarse gain option that CAN be used to improve SFDR performance with little degradation in SNR. In addition to the coarse gain, fine gain options also exist, programmable in 1 dB steps up to 6 dB.
The output Interface is 2-wire, where each ADC data is serialized and output over two LVDs pairs. This makes it possible to halve the serial data rate (compared to a 1-wire interface) and restrict it to less than 1 Gbps easing receiver design. The ADS622X also includes the traditional 1-wire Interface that CAN be used at lower sampling frequencies.
An internal phase lock loop (PLL) multiplies the incoming ADC sampling Clock to derive the bit Clock The bit Clock is used to serialize the ADC data from each channel. In addition to the serial data streams, the frame and bit Clocks are also transmitted as LVDs outputs. The LVDs output Buffers have features such as programmable LVDs currents, current doubling modes and internal termination options. These CAN be used to widen eye-openings and improve signal integrity, easing capture by the receiver.
The ADC channel outputs CAN be transmitted either as MSB or LSB first and 2s complement or straight binary.
ADS622X has internal references, but CAN also support an external reference mode. The device is specified over the industrial temperature range (-40C to 85C).
By Texas Instruments
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