AD9517-4
Data Sheet
Rev. E | Page 4 of 80
SPECIFICATIONS
Typical is given for VS = VS_LVPECL = 3.3 V ± 5%; VS ≤ VCP ≤ 5.25 V; TA = 25°C; RSET = 4.12 k; CPRSET = 5.1 k, unless otherwise noted.
Minimum and maximum values are given over full VS and TA (40°C to +85°C) variation.
POWER SUPPLY REQUIREMENTS
Table 1.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
VS
3.135
3.3
3.465
V
3.3 V ± 5%
VS_LVPECL
2.375
VS
V
Nominally 2.5 V to 3.3 V ± 5%
VCP
VS
5.25
V
Nominally 3.3 V to 5.0 V ± 5%
RSET Pin Resistor
4.12
k
Sets internal biasing currents; connect to ground
CPRSET Pin Resistor
2.7
5.1
10
k
Sets internal CP current range, nominally 4.8 mA (CP_lsb = 600 A);
actual current can be calculated by CP_lsb = 3.06/CPRSET; connect
to ground
BYPASS Pin Capacitor
220
nF
Bypass for internal LDO regulator; necessary for LDO stability;
connect to ground
PLL CHARACTERISTICS
Table 2.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
VCO (ON-CHIP)
Frequency Range
1450
1800
MHz
VCO Gain (KVCO)
50
MHz/V
Tuning Voltage (VT)
0.5
VCP
0.5
V
VCP ≤ VS when using internal VCO; outside of this range,
the CP spurs may increase due to CP up/down mismatch
Frequency Pushing (Open Loop)
1
MHz/V
Phase Noise at 100 kHz Offset
109
dBc/Hz
f = 1625 MHz
Phase Noise at 1 MHz Offset
128
dBc/Hz
f = 1625 MHz
REFERENCE INPUTS
Differential Mode (REFIN, REFIN)
Differential mode (can accommodate single-ended input by ac
grounding undriven input)
Input Frequency
0
250
MHz
Frequencies below about 1 MHz should be dc-coupled; be careful
to match VCM (self-bias voltage)
Input Sensitivity
250
mV p-p
PLL figure of merit (FOM) increases with increasing slew rate
Figure 14); the input sensitivity is sufficient for ac-coupled
LVDS and LVPECL signals
Self-Bias Voltage, REFIN
1.35
1.60
1.75
V
Self-bias voltage of REFI
N1Self-Bias Voltage, REFIN
1.30
1.50
1.60
V
Self-bias voltage of REFI
N1Input Resistance, REFIN
4.0
4.8
5.9
k
Input Resistance, REFIN
4.4
5.3
6.4
k
Dual Single-Ended Mode (REF1, REF2)
Two single-ended CMOS-compatible inputs
Input Frequency (AC-Coupled)
20
250
MHz
Slew rate > 50 V/s
Input Frequency (DC-Coupled)
0
250
MHz
Slew rate > 50 V/s; CMOS levels
Input Sensitivity (AC-Coupled)
0.8
V p-p
Should not exceed VS p-p
Input Logic High
2.0
V
Input Logic Low
0.8
V
Input Current
100
+100
A
Pulse Width High/Low
1.8
ns
This value determines the allowable input duty cycle and is the
amount of time that a square wave is high/low
Input Capacitance
2
pF
Each pin, REFIN/REFIN (REF1/REF2)
PHASE/FREQUENCY DETECTOR (PFD)
PFD Input Frequency
100
MHz
Antibacklash pulse width = 1.3 ns, 2.9 ns
45
MHz
Antibacklash pulse width = 6.0 ns
Antibacklash Pulse Width
1.3
ns
Register 0x017[1:0] = 01b
2.9
ns
Register 0x017[1:0] = 00b; Register 0x017[1:0] = 11b
6.0
ns
Register 0x017[1:0] = 10b