ADS62P49 datasheet(17/77 Pages) TI

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SERIAL INTERFACE TIMING CHARACTERISTICS

Serial Register Readout

ADS62P49 / ADS62P29

ADS62P48 / ADS62P28

www.ti.com............................................................................................................................................................. SLAS635A – APRIL 2009 – REVISED JUNE 2009

Typical values at 25°C, min and max values across the full temperature range TMIN = –40°C to TMAX = 85°C, AVDD = 3.3V,

DRVDD = 1.8V (unless otherwise noted).

PARAMETER

MIN

TYP

MAX

UNIT

fSCLK

SCLK frequency (= 1/ tSCLK)

> DC

MHz

tSLOADS

SEN to SCLK setup time

tSLOADH

SCLK to SEN hold time

tDS

SDATA setup time

tDH

SDATA hold time

The device includes an option where the contents of the internal registers can be read back. This may be useful

as a diagnostic check to verify the serial interface communication between the external controller AND the ADC.

First, set register bit <SERIAL READOUT> = 1. This also disables any further writes into the registers.

Initiate a serial interface cycle specifying the address of the register (A7-A0) whose content has to be read.

The device outputs the contents (D7-D0) of the selected register on the SDOUT pin (64).

The external controller can latch the contents at the falling edge of SCLK.

To enable register writes, reset register bit <SERIAL READOUT> = 0. SDOUT is a CMOS output pin; the readout functionality is

available whether the ADC output data interface is LVDS or CMOS.

When <SERIAL READOUT> is disabled, the SDOUT pin is forced low by the device (and not put in

high-impedance). If serial readout is not used, the SDOUT pin has to be floated.

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Product Folder Link(s): ADS62P49 / ADS62P29 ADS62P48 / ADS62P28

ADS62P49 Datasheet(PDF) 17 Page - Texas Instruments

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