Datasheet

AD9525 Data Sheet
Rev. A | 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 107 132 mW
No LVPECL output on to one LVPECL output on
at 2949.12 MHz; same output pair
One Channel, Two Drivers 184 233 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 inputs
1
Self-Bias Voltage, REFA and REFB
1.38 1.50 1.61 V
Self-bias voltage of
REFA and REFB inputs
1
Input Resistance, REFA and REFB
4.5
4.7
4.9
kΩ
Self-biased
1
Input Resistance, REFA and REFB
4.9 5.2 5.4 kΩ Self-biased
1
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