AD9523 datasheet(10/60 Pages) AD

Part #	AD9523

Description	Jitter Cleaner and Clock Generator

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Manufacturer	AD [Analog Devices]

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10 / 60 page

AD9523

Data Sheet

Rev. D | Page 10 of 60

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

SDIO, SDO (OUTPUTS)

Output Logic 1 Voltage

2.7

V

Output Logic 0 Voltage

0.4

V

TIMING

Clock Rate (SCLK, 1/tSCLK)

25

MHz

Pulse Width High, tHIGH

8

ns

Pulse Width Low, tLOW

12

ns

SDIO to SCLK Setup, tDS

3.3

ns

SCLK to SDIO Hold, tDH

0

ns

SCLK to Valid SDIO and SDO, tDV

14

ns

CS to SCLK Setup, tS

10

ns

CS to SCLK Setup and Hold, tS, tC

0

ns

CS Minimum Pulse Width High, tPWH

6

ns

SERIAL CONTROL PORT—I²C MODE

VDD = VDD3_REF, unless otherwise noted.

Table 16.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

SDA, SCL (WHEN INPUTTING DATA)

Input Logic 1 Voltage

0.7 × VDD

V

Input Logic 0 Voltage

0.3 × VDD

V

Input Current with an Input Voltage Between

0.1 × VDD and 0.9 × VDD

−10

+10

µA

Hysteresis of Schmitt Trigger Inputs

0.015 × VDD

V

Pulse Width of Spikes That Must Be

Suppressed by the Input Filter, tSPIKE

50

ns

SDA (WHEN OUTPUTTING DATA)

Output Logic 0 Voltage at 3 mA Sink Current

0.4

V

Output Fall Time from VIHMIN to VILMAX with

a Bus Capacitance from 10 pF to 400 pF

20 + 0.1 CB1

250

ns

TIMING

Note that all I2C timing values are referred to

VIHMIN (0.3 × VDD) and VILMAX levels (0.7 × VDD)

Clock Rate (SCL, fI2C)

400

kHz

Bus Free Time Between a Stop and Start

Condition, tIDLE

1.3

µs

Setup Time for a Repeated Start Condition, tSET;

STR

0.6

µs

Hold Time (Repeated) Start Condition, tHLD;STR

0.6

µs

After this period, the first clock pulse is

generated

Setup Time for Stop Condition, tSET;STP

0.6

µs

Low Period of the SCL Clock, tLOW

1.3

µs

High Period of the SCL Clock, tHIGH

0.6

µs

SCL, SDA Rise Time, tRISE

20 + 0.1 CB1

300

ns

SCL, SDA Fall Time, tFALL

20 + 0.1 CB1

300

ns

Data Setup Time, tSET;DAT

100

ns

Data Hold Time, tHLD;DAT

100

880

ns

This is a minor deviation from the original I²C

specification of 0 ns minimum2

Capacitive Load for Each Bus Line, CB1

400

pF

1 CB is the capacitance of one bus line in picofarads (pF).

2 According to the original I2C specification, an I2C master must also provide a minimum hold time of 300 ns for the SDA signal to bridge the undefined region of the SCL

falling edge.

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