Datasheet

AD9553
Rev. A | Page 4 of 44
RESET
PIN
Table 4.
Parameter Min Typ Max Unit Test Conditions/Comments
INPUT CHARACTERISTICS
1
Input Voltage High, V
IH
1.96 V
Input Voltage Low, V
IL
0.85 V
Input Current High, I
INH
0.3 12.5 µA
Input Current Low, I
INL
31 43 µA
MINIMUM PULSE WIDTH LOW 150 µs Tested with an active source driving the
RESET
pin
1
The
RESET
pin has a 100 kΩ internal pull-up resistor.
REFERENCE CLOCK INPUT CHARACTERISTICS
Table 5.
Parameter Min Typ Max Unit Test Conditions/Comments
DIFFERENTIAL INPUT
Input Frequency Range 0.008 250 MHz
710 MHz Assumes minimum LVDS input level and requires
bypassing of the divide-by-5 divider and ×2 multiplier
Common-Mode Internally Generated
Input Voltage
613 692 769 mV Use ac coupling to preserve the internal dc bias of the
differential input
Differential Input Voltage Sensitivity 250 mV p-p Requires ac coupling; can accommodate single-ended
input by ac grounding unused input; the instantaneous
voltage on either pin must not exceed the 3.3 V dc supply
rails
Differential Input Resistance 5 kΩ
Differential Input Capacitance 3 pF
Duty Cycle Pulse width high and pulse width low specifications
establish the bounds for duty cycle
Pulse Width Low 1.6 ns Up to 250 MHz
Pulse Width High 1.6 ns Up to 250 MHz
Pulse Width Low 0.64 ns Beyond 250 MHz, up to 710 MHz
Pulse Width High 0.64 ns Beyond 250 MHz, up to 710 MHz
CMOS SINGLE-ENDED INPUT
Input Frequency Range 0.008 200 MHz
Input High Voltage 1.62 V
Input Low Voltage 0.52 V
Input Threshold Voltage 1.0 V When ac coupling to the input receiver, the user must dc
bias the input to 1 V; the single-ended CMOS input is 3.3 V
compatible
Input High Current 0.04 µA
Input Low Current 0.03 µA
Input Capacitance 3 pF
Duty Cycle Pulse width high and pulse width low establish the
bounds for duty cycle
Pulse Width Low 2 ns
Pulse Width High 2 ns
×2 FREQUENCY MULTIPLIER 125 MHz To avoid excessive reference spurs, the ×2 multiplier
requires 48% to 52% duty cycle; reference clock input
frequencies greater than 125 MHz require the use of the
divide-by-5 divider