AD9530 datasheet(6/41 Pages) AD

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AD9530

Data Sheet

Rev. 0 | Page 6 of 41

REFA/REFA AND REFB/REFB INPUT CHARACTERISTICS

Table 4.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

DC-COUPLED LVDS MODE (REFA, REFA;

REFB, REFB)

DC-coupled LVDS mode (REFx_TERM_SEL = 00);

includes an internal 100 Ω differential termination;

inputs are not self biased in this setting

Input Frequency

800

MHz

Assumes a minimum of 494 mV p-p differential

amplitude as measured with a differential probe at

the REFx input pins

Input Sensitivity

494

mV p-p

Peak-to-peak differential voltage swing across the

pins to ensure switching between logic levels as

measured with a differential probe

Common-Mode Input Voltage

0.4

1.4

Allowable common-mode voltage for dc coupling

Differential Input Resistance

110

Ω

Differential input resistance measured across the REFx

and REFx pins

Input Capacitance

Input capacitance measured from each REFx pin to GND

DC-COUPLED CML MODE (REFA, REFA,

REFB, REFB)

DC-coupled (REFx_TERM_SEL = 01); includes an internal

termination of 50 Ω from each REFx input to GND;

inputs are not self biased in this setting

Input Frequency

800

MHz

Assumes a minimum of 494 mV p-p differential

amplitude as measured with a differential probe at

the REFx input pins

Input Sensitivity

494

mV p-p

Peak-to-peak differential voltage swing across pins to

ensure switching between logic levels as measured

with a differential probe

Common-Mode Input Voltage

0.3

0.4

Allowable common-mode voltage for dc coupling

Single-Ended Input Resistance

Ω

Input resistance measured from each REFx pin to GND

Input Capacitance

Input capacitance measured from each REFx pin to GND

AC-COUPLED CML MODE (REFA, REFA,

REFB, REFB)

AC-coupled mode (REFx_TERM_SEL = 10); includes an

internal termination of 50 Ω from each REFx input to a

nominal dc bias of 0.35 V

Input Frequency

800

MHz

Assumes a minimum of 494 mV p-p differential

amplitude as measured with a differential probe at

the REFx input pins

Input Sensitivity

494

mV p-p

Peak-to-peak differential voltage swing across pins to

ensure switching between logic levels as measured

with a differential probe

Input Self Bias Voltage (VTT)

(Internally Generated)

0.32

0.355

0.39

Self bias voltage of the REFx and REFx inputs in ac-

coupled mode (REFx_TERM_SEL = 10)

Differential Input Resistance

105

Ω

Differential input resistance measured across the REFx

and REFx pins

Input Capacitance

Input capacitance measured from each REFx pin to GND

DC-COUPLED HIGH-Z MODE (REFA, REFA,

REFB, REFB)

DC-coupled high-Z mode (REFx_TERM_SEL = 11) places

the REFx inputs into a high impedance state; inputs

are not self biased in this setting

Input Frequency

800

MHz

Assumes a minimum of 500 mV p-p differential

amplitude as measured with a differential probe at

the REFx input pins

Input Sensitivity

494

mV p-p

Peak-to-peak differential voltage swing across pins to

ensure switching between logic levels as measured

with a differential probe

Common-Mode Input Voltage

0.4

1.4

Differential Input Resistance

10.3

kΩ

Differential input resistance measured across the REFx

and REFx pins

Input Capacitance

Input capacitance measured from each REFx pin to GND

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