ADS5500IPAP datasheet(7/29 Pages) TI

7 / 29 page

ADS5500

SBAS303C − DECEMBER 2003 − REVISED MARCH 2004

www.ti.com

ADDRESS

SDATA

MSB

DATA

D11

D10

Figure 2. DATA Communication is 2-Byte, MSB First

SLOADS

WSCLK

SCLK

16 x M

MSB

LSB

MSB

SLOADH

SCLK

SEN

SDATA

Figure 3. Serial Programming Interface Timing Diagram

Table 1. Serial Programming Interface Timing Characteristics

SYMBOL

PARAMETER

MIN(1)

TYP(1)

MAX(1)

UNIT

tSCLK

SCLK Period

tWSCLK

SCLK Duty Cycle

tSLOADS

SEN to SCLK setup time

tSLOADH

SCLK to SEN hold time

tDS

Data Setup Time

tDH

Data Hold Time

(1) Min, typ, and max values are characterized, but not production tested.

Table 2. Serial Register Table

D11

D10

DESCRIPTION

DLL

OFF

DLL OFF = 0 : internal DLL is on, recommended for

60−125MSPS clock speed

DLL OFF = 1 : internal DLL is off, recommended for

10−80MSPS clock speed

TP<1>

TP<0>

TP<1:0> − Test modes for output data capture

TP<1> = 0, TP<0> = 0 : Normal mode of operation,

TP<1> = 0

TP<0> = 1 : All output lines are pulled to ’0’, TP<1> = 1

TP<0> = 0 : All output lines are pulled to ’1’, TP<1> = 1

TP<0> = 1 : A continuous stream of ’10’ comes out on

all output lines

PDN

PDN = 0 : Normal mode of operation, PDN = 1 :

Device is put in power down (low current) mode

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