AD9643 datasheet(28/36 Pages) AD

Part #	AD9643

Description	14-Bit, 170 MSPS/210 MSPS/250 MSPS, 1.8 V Dual Analog-to-Digital Converter (ADC)

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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28 / 36 page

AD9643

Rev. A | Page 28 of 36

CHANNEL/CHIP SYNCHRONIZATION

The AD9643 has a SYNC input that allows the user flexible

synchronization options for synchronizing the internal blocks.

The SYNC feature is useful for guaranteeing synchronized

operation across multiple ADCs. The input clock divider can be

synchronized using the SYNC input. The divider can be enabled

to synchronize on a single occurrence of the SYNC signal or on

every occurrence by setting the appropriate bits in Register 0x3A.

The SYNC input is internally synchronized to the sample clock.

However, to ensure that there is no timing uncertainty between

multiple parts, the SYNC input signal should be synchronized

to the input clock signal. The SYNC input should be driven

using a single-ended CMOS type signal.

Using Bit 1 in Register 0x59, the SYNC input can be set to either

level or edge sensitive mode. If the SYNC input is set to edge

sensitive mode, Bit 0 of Register 0x59 can be used to determine

whether the rising or falling edge is used.

AD9643 Datasheet(PDF) 28 Page - Analog Devices