AD9525

Data Sheet

Rev. 0 | Page 4 of 48

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

POWER DELTAS, INDIVIDUAL FUNCTIONS

Power delta when a function is enabled/disabled

M Divider On/Off

5

8.7

mW

M divider bypassed

P Divider On/Off

3

5.7

mW

P divider bypassed

B Divider On/Off

16

23.1

mW

B divider bypassed

REFB On

15

25

mW

Delta from powering down REFB differential input

PLL On/Off

254

300.5

mW

PLL off to PLL on, normal operation; no reference

enabled

One Channel, One Driver

159

184

mW

No LVPECL output on to one LVPECL output on

at 2949.12 MHz; same output pair

One Channel, Two Drivers

288

337

mW

No LVPECL output on to two LVPECL outputs on

at 2949.12 MHz; same output pair

REFA AND REFB INPUT CHARACTERISTICS

Table 4.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

DIFFERENTIAL MODE (REFA, REFA; REFB, REFB)

Differential mode (can accommodate single-

ended input by ac grounding unused input)

Input Frequency

0

500

MHz

Frequencies below ~1 MHz should be dc-coupled;

be careful to match self-bias voltage

Input Sensitivity

200

mV p-p

Frequency at 122.88 MHz

Self-Bias Voltage, REFA and REFB

1.52

1.65

1.78

V

Self-bias voltage of REFA and REFB inputs1

Self-Bias Voltage, REFA and REFB

1.38

1.50

1.61

V

Self-bias voltage of REFA and REFB inputs1

Input Resistance, REFA and REFB

4.5

4.7

4.9

kΩ

Self-biased1

Input Resistance, REFA and REFB

4.9

5.2

5.4

kΩ

Self-biased1

DUTY CYCLE

Duty cycle bounds are set by pulse width high and

pulse width low

Pulse Width Low

500

ps

Pulse Width High

500

ps

1

The differential pairs of REFA and REFA, REFB and REFB self-bias points are offset slightly to avoid chatter on an open input condition.

REFC INPUT CHARACTERISTICS

Table 5.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

REFC INPUT

Input Frequency Range

300

MHz

DC-coupled input (not self-biased)

Input High Voltage

2.0

V

Input Low Voltage

0.8

V

Input Current

1

µA

Duty Cycle

Duty cycle bounds are set by pulse width high and

pulse width low

Pulse Width Low

1

ns

Pulse Width High

1

ns