AD9557SLASHPCBZ datasheet(13/92 Pages) AD

13 / 92 page

Data Sheet

AD9557

Rev. A | Page 13 of 92

SERIAL PORT SPECIFICATIONS—I2C MODE

Table 16.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

SDA, SCL (AS INPUT)

Input Logic 1 Voltage

0.7 ×

DVDD3

Input Logic 0 Voltage

0.3 ×

DVDD3

Input Current

−10

+10

μA

For VIN = 10% to 90% DVDD3

Hysteresis of Schmitt Trigger Inputs

0.015 ×

DVDD3

Pulse Width of Spikes That Must Be Suppressed

by the Input Filter, tSP

SDA (AS OUTPUT)

Output Logic 0 Voltage

0.4

IO = 3 mA

Output Fall Time from VIHmin to VILmax

20 + 0.1 Cb1

250

10 pF ≤ Cb ≤ 400 pF1

TIMING

SCL Clock Rate

400

kHz

Bus-Free Time Between a Stop and Start Condition,

tBUF

1.3

μs

Repeated Start Condition Setup Time, tSU; STA

0.6

μs

Repeated Hold Time Start Condition, tHD;STA

0.6

μs

After this period, the first clock pulse

is generated

Stop Condition Setup Time, tSU; STO

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, tR

20 + 0.1 Cb1

300

SCL/SDA Fall Time, tF

20 + 0.1 Cb1

300

Data Setup Time, tSU; DAT

100

Data Hold Time, tHD; DAT

100

Capacitive Load for Each Bus Line, Cb1

400

1 Cb is the capacitance (pF) of a single bus line.

JITTER GENERATION

Jitter generation (random jitter) uses 49.152 MHz crystal for system clock input.

Table 17.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

JITTER GENERATION

System clock doubler enabled;

high phase margin mode enabled;

0x07; Register 0x0400 = 0x81; in cases

where multiple driver types are listed,

both driver types were tested at those

conditions, and the one with higher jitter

is quoted, although there is usually not

a significant jitter difference between

the driver types

fREF = 19.44 MHz; fOUT = 622.08 MHz; fLOOP = 50 Hz

HSTL Driver

Bandwidth: 5 kHz to 20 MHz

304

fs rms

Bandwidth: 12 kHz to 20 MHz

296

fs rms

Bandwidth: 20 kHz to 80 MHz

300

fs rms

Bandwidth: 50 kHz to 80 MHz

266

fs rms

Bandwidth: 16 MHz to 320 MHz

185

fs rms

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