Datasheet

Data Sheet AD9520-3
Rev. A | Page 7 of 80
CLOCK INPUTS
Table 3.
Parameter Min Typ Max Unit Test Conditions/Comments
CLOCK INPUTS (CLK,
CLK
)
Differential input
Input Frequency
0
1
2.4
GHz
High frequency distribution (VCO divider)
0
1
2.0 GHz Distribution only (VCO divider bypassed); this is the
frequency range supported by the channel divider for
all divide ratios except divide-by-17 and divide-by-3
0
1
1.6 GHz Distribution only (VCO divider bypassed); this is the
frequency range supported by all channel divider ratios
Input Sensitivity, Differential 150 mV p-p Measured at 2.4 GHz; jitter performance is improved
with slew rates > 1 V/ns; the input sensitivity is
sufficient for ac-coupled LVDS and LVPECL signals
Input Level, Differential 2 V p-p Larger voltage swings can turn on the protection
diodes and can degrade jitter performance
Input Common-Mode Voltage, V
CM
1.3 1.57 1.8 V Self-biased; enables ac coupling
Input Common-Mode Range, V
CMR
1.3 1.8 V With 200 mV p-p signal applied; dc-coupled
Input Sensitivity, Single-Ended
150
mV p-p
CLK ac-coupled;
CLK
ac-bypassed to RF ground
Input Resistance 3.9 4.7 5.7 kΩ Self-biased
Input Capacitance 2 pF
1
Below about 1 MHz, the input should be dc-coupled. Care should be taken to match V
CM
.
CLOCK OUTPUTS
Table 4.
Parameter Min Typ Max Unit Test Conditions/Comments
LVPECL CLOCK OUTPUTS Termination = 50 Ω to V
S_DRV
− 2 V
OUT0, OUT1, OUT2, OUT3, OUT4,
OUT5, OUT6, OUT7, OUT8,
OUT9, OUT10, OUT11
Differential (OUT,
OUT
)
Output Frequency, Maximum 2400 MHz Using direct to output (see Figure 20); higher
frequencies are possible, but the resulting amplitude
does not meet the V
OD
specification; the maximum
output frequency is limited by either the maximum VCO
frequency or the frequency at the CLK inputs,
depending on the AD9520 configuration
Output High Voltage, V
OH
V
S_DRV
− 1.07
V
S_DRV
− 0.96
V
S_DRV
− 0.84
V
Output Low Voltage, V
OL
V
S_DRV
− 1.95 V
S_DRV
− 1.79 V
S_DRV
− 1.64 V
Output Differential Voltage, V
OD
660 820 950 mV V
OH
− V
OL
for each leg of a differential pair for default
amplitude setting with the driver not toggling; the
peak-to-peak amplitude measured using a differential
probe across the differential pair with the driver
toggling is roughly 2× these values (see Figure 20
for
variation over frequency)
CMOS CLOCK OUTPUTS
OUT0A, OUT0B, OUT1A, OUT1B,
OUT2A, OUT2B, OUT3A, OUT3B,
OUT4A, OUT4B, OUT5A, OUT5B,
OUT6A, OUT6B, OUT7A, OUT7B,
OUT8A, OUT8B, OUT9A, OUT9B,
OUT10A, OUT10B, OUT11A,
OUT11B
Single-ended; termination = 10 pF
Output Frequency
250
MHz
See Figure 21
Output Voltage High, V
OH
V
S
− 0.1 V 1 mA load, V
S_DRV
= 3.3 V/2.5 V
Output Voltage Low, V
OL
0.1 V 1 mA load, V
S_DRV
= 3.3 V/2.5 V
Output Voltage High, V
OH
2.7 V 10 mA load V
S_DRV
= 3.3 V
Output Voltage Low, V
OL
0.5 V 10 mA load, V
S_DRV
= 3.3 V
Output Voltage High, V
OH
1.8 V 10 mA load, V
S_DRV
= 2.5 V
Output Voltage Low, V
OL
0.6
V
10 mA load, V
S_DRV
= 2.5 V