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ADS62P49 Datasheet(PDF) 17 Page - Texas Instruments

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Part No. ADS62P49
Description  Dual Channel 14-/12-Bit, 250-/210-MSPS ADC With DDR LVDS and Parallel CMOS Outputs
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS62P49 Datasheet(HTML) 17 Page - Texas Instruments

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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
20
MHz
tSLOADS
SEN to SCLK setup time
25
ns
tSLOADH
SCLK to SEN hold time
25
ns
tDS
SDATA setup time
25
ns
tDH
SDATA hold time
25
ns
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.
a.
First, set register bit <SERIAL READOUT> = 1. This also disables any further writes into the registers.
b.
Initiate a serial interface cycle specifying the address of the register (A7-A0) whose content has to be read.
c.
The device outputs the contents (D7-D0) of the selected register on the SDOUT pin (64).
d.
The external controller can latch the contents at the falling edge of SCLK.
e.
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.
Copyright © 2009, Texas Instruments Incorporated
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Product Folder Link(s): ADS62P49 / ADS62P29 ADS62P48 / ADS62P28


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