AD9545 datasheet(11/157 Pages) AD

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Data Sheet

AD9545

Rev. A | Page 11 of 157

REFERENCE INPUTS

Table 5.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

DIFFERENTIAL MODE

Differential mode specifications assume ac coupling of the

input signal to the reference input pins

Frequency Range

Sinusoidal Input

750

MHz

Lower limit dependent on input slew rate

Low Voltage Positive

Emitter Coupled

Logic (LVPECL) Input

750 × 106

Lower limit dependent on ac coupling

LVDS Input

500 × 106

Assumes an LVDS minimum of 494 mV p-p differential

amplitude; lower limit dependent on ac coupling

Slew Rate for Sinusoidal

Input

V/µs

Minimum input slew rate for device operation; jitter

degradation may occur for slew rates < 35 V/µs

Common-Mode Input

Voltage

0.64

Internally generated self bias voltage

Differential Input

Amplitude

Peak-to-peak differential voltage swing across pins required to

ensure switching between logic levels as measured with a

differential probe; instantaneous voltage on either pin must

not exceed 1.3 V

fIN < 500 MHz

350

2100

mV p-p

fIN = 500 MHz to

750 MHz

500

2100

mV p-p

Differential Input Voltage

Hysteresis

100

Input Resistance

kΩ

Equivalent differential input resistance

Input Pulse Width

LVPECL

600

LVDS

900

DC-COUPLED, LVDS-

COMPATIBLE MODE

Applies for dc coupling to an LVDS source

Frequency Range

450 × 106

Common-Mode Input

Voltage

1.125

1.375

Differential Input

Amplitude

400

1200

mV p-p

Differential voltage across pins required to ensure switching

between logic levels; instantaneous voltage on either pin

must not exceed the supply rails

Differential Input Voltage

Hysteresis

100

Input Resistance

kΩ

Input Pulse Width

SINGLE-ENDED MODE

Single-ended mode specifications assume dc coupling of the

input signal to the reference input pins

Frequency Range

1.2 V AC-Coupled

500 × 106

Lower limit dependent on ac coupling

1.2 V and 1.8 V

Complementary

Metal Oxide

Semiconductor

(CMOS)

500 × 106

CMOS specifications assume dc coupling of the input signal to

the reference input pins

1.2 V AC-Coupled

Common-Mode

Voltage

610

Internally generated self-bias voltage

Input Amplitude (Single-

Ended, AC-Coupled

Mode)

360

1200

mV p-p

Peak-to-peak single-ended voltage swing; instantaneous

voltage must not exceed 1.3 V

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