AD9520-4
Data Sheet
Rev. A | Page 4 of 80
SPECIFICATIONS
Typical is given for VS = VS_DRV= 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
POWER PINS
VS
3.135
3.3
3.465
V
3.3 V ± 5%
VS_DRV
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%
CURRENT SET RESISTORS
RSET Pin Resistor
4.12
k
Sets internal biasing currents; connect to ground
CPRSET Pin Resistor
5.1
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
1400
1800
MHz
VCO Gain (KVCO)
35
MHz/V
Tuning Voltage (VT)
0.5
VCP 0.5
V
VT ≤ VS when using internal VCO
Frequency Pushing (Open-Loop)
1
MHz/V
Phase Noise at 1 kHz Offset
58
dBc/Hz
f = 1625 MHz
Phase Noise at 100 kHz Offset
111
dBc/Hz
f = 1625 MHz
Phase Noise at 1 MHz Offset
130
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
280
mV p-p
PLL figure of merit (FOM) increases with increasing slew
rate (see Figure 12); 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 with
DC Offset Off)
10
250
MHz
Slew rate must be > 50 V/s
Input Frequency (AC-Coupled with
DC Offset On)
250
MHz
Slew rate must be > 50 V/s, and input amplitude sensitivity
specification must be met; see the input sensitivity
parameter
Input Frequency (DC-Coupled)
0
250
MHz
Slew rate > 50 V/s; CMOS levels
Input Sensitivity (AC-Coupled with
DC Offset Off)
0.55
3.28
V p-p
VIH should not exceed VS
Input Sensitivity (AC-Coupled with
DC Offset On)
1.5
2.78
V p-p
VIH should not exceed VS
Input Logic High, DC Offset Off
2.0
V
Input Logic Low, DC Offset Off
0.8
V
Input Current
100
+100
A
Input Capacitance
2
pF
Each pin, REFIN (REF1)/REFIN (REF2)