AD9520-3 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
AD9520-3 Datasheet PDF : 84 Pages
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AD9520-3
PD, SYNC, AND RESET PINS
Table 15.
Parameter
Min Typ Max Unit Test Conditions/Comments
INPUT CHARACTERISTICS
These pins each have a 30 kΩ internal pull-up resistor
Logic 1 Voltage
2.0
V
Logic 0 Voltage
0.8 V
Logic 1 Current
1 μA
Logic 0 Current
−110
μA The minus sign indicates that current is flowing out of
the AD9520, which is due to the internal pull-up resistor
Capacitance
2
pF
RESET TIMING
Pulse Width Low
50
ns
RESET Inactive to Start of Register Programming 100
ns
SYNC TIMING
Pulse Width Low
1.3
ns High speed clock is CLK input signal
SERIAL PORT SETUP PINS: SP1, SP0
Table 16.
Parameter
SP1, SP0
Logic Level 0
Logic Level ½
Min
0.4 × VS
Typ Max
0.25 × VS
0.65 × VS
Logic Level 1 0.8 × VS
Unit Test Conditions/Comments
These pins do not have internal pull-up/pull-down resistors
V
VS is the voltage on the VS pin
V
User can float these pins to obtain Logic Level ½; if floating this pin, user
should connect a capacitor to ground
V
LD, STATUS, AND REFMON PINS
Table 17.
Parameter
Min Typ Max Unit Test Conditions/Comments
OUTPUT CHARACTERISTICS
When selected as a digital output (CMOS); there are other
modes in which these pins are not CMOS digital outputs;
see Table 53, 0x017, 0x01A, and 0x01B
Output Voltage High, VOH
2.7
V
Output Voltage Low, VOL
0.4 V
MAXIMUM TOGGLE RATE
100
MHz Applies when mux is set to any divider or counter output,
or PFD up/down pulse; also applies in analog lock detect
mode; usually debug mode only; beware that spurs can
couple to output when any of these pins are toggling
ANALOG LOCK DETECT
Capacitance
3
pF On-chip capacitance; used to calculate RC time constant
for analog lock detect readback; use a pull-up resistor
REF1, REF2, AND VCO FREQUENCY STATUS MONITOR
Normal Range
1.02
MHz Frequency above which the monitor indicates the
presence of the reference
Extended Range
8
kHz Frequency above which the monitor indicates the
presence of the reference
LD PIN COMPARATOR
Trip Point
1.6
V
Hysteresis
260
mV
Rev. 0 | Page 15 of 84
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