Datasheet
REV. B–2–
ADF4252–SPECIFICATIONS
1
(V
DD
1 = V
DD
2 = V
DD
3 = DV
DD
= 3 V ⴞ 10%, DV
DD
< V
P
1, V
P
2 < 5.5 V, GND = 0 V,
R
SET
= 2.7 k⍀, dBm referred to 50 ⍀, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Parameter B Version Unit Test Conditions/Comments
RF CHARACTERISTICS
RF Input Frequency (RF
IN
A, RF
IN
B)
2
0.25/3.0 GHz min/max
RF Input Sensitivity –10/0 dBm min/max
RF Input Frequency (RF
IN
A, RF
IN
B)
2
0.1/3.0 GHz min/max Input Level = –8/0 dBm min/max
RF Phase Detector Frequency 30 MHz max Guaranteed by Design
Allowable Prescaler Output Frequency 375 MHz max
IF CHARACTERISTICS
IF Input Frequency (IF
IN
A, IF
IN
B)
2
50/1200 MHz min/max
IF Input Sensitivity –10/0 dBm min/max
IF Phase Detector Frequency 55 MHz max Guaranteed by Design
Allowable Prescaler Output Frequency 150 MHz max
REFERENCE CHARACTERISTICS
REF
IN
Input Frequency 250 MHz max For f < 10 MHz, use dc-coupled square
wave (0 to V
DD
).
REF
IN
Input Sensitivity 0.5/V
DD
1V p-p min/max AC-coupled. When dc-coupled, use
0 to V
DD
max (CMOS compatible).
REF
IN
Input Current ± 100 µA max
REF
IN
Input Capacitance 10 pF max
CHARGE PUMP
RF I
CP
Sink/Source High Value 4.375 mA typ See Table V
Low Value 625 µA typ
IF I
CP
Sink/Source High Value 5 mA typ See Table IX
Low Value 625 µA typ
I
CP
Three-State Leakage Current 1 nA typ
RF Sink and Source Current Matching 2 % typ 0.5 V < V
CP
< V
P
– 0.5
R
SET
Range 1.5/1.6 k typ See Table V
IF Sink and Source Current Matching 2 % typ
I
CP
vs. V
CP
2% typ 0.5 V < V
CP
< V
P
– 0.5
I
CP
vs. Temperature 2 % typ V
CP
= V
P
/2
LOGIC INPUTS
V
INH
, Input High Voltage 1.35 V min
V
INL
, Input Low Voltage 0.6 V max
I
INH
/I
INL
, Input Current ± 1 µA max
C
IN
Input Capacitance 10 pF max
LOGIC OUTPUTS
V
OH
, Output High Voltage V
DD
– 0.4 V min I
OH
= 0.2 mA
V
OL
, Output Low Voltage 0.4 V max I
OL
= 0.2 mA
POWER SUPPLIES
V
DD
1
,
V
DD
2, V
DD
3 2.7/3.3 V min/V max
DV
DD
V
DD
1
V
P
1, V
P
2V
DD
1/5.5 V min/V max
I
DD
3
RF + IF 13 mA typ 16 mA max
RF Only 10 mA typ 13 mA max
IF Only 4 mA typ 5.5 mA max
Power-Down Mode 1 µA typ
RF NOISE AND SPURIOUS CHARACTERISTICS
Noise Floor –141 dBc/Hz typ @ 20 MHz PFD Frequency
In-Band Phase Noise Performance
4
@ VCO Output
Lowest Spur Mode –90 dBc/Hz typ RF
OUT
= 1.8 GHz, PFD = 20 MHz
Low Noise and Spur Mode –95 dBc/Hz typ RF
OUT
= 1.8 GHz, PFD = 20 MHz
Lowest Noise Mode –103 dBc/Hz typ RF
OUT
= 1.8 GHz, PFD = 20 MHz
Spurious Signals See Typical Performance Characteristics
NOTES
1
Operating Temperature Range (B Version): –40°C to +85°C.
2
Use a square wave for frequencies less than f
MIN
.
3
RF = 1 GHz, RF PFD = 10 MHz, MOD = 4095, IF = 500 MHz, IF PFD = 200 kHz, REF = 10 MHz, V
DD
= 3 V, V
P
1 = 5 V, and V
P
2 = 3 V.
4
The in-band phase noise is measured with the EVAL-ADF4252EB2 evaluation board and the HP5500E phase noise test system. The spectrum analyzer provides the
REF
IN
for the synthesizer (f
REFOUT
= 10 MHz @ 0 dBm). f
OUT
= 1.74 GHz, f
REF
= 20 MHz, N = 87, Mod = 100, Channel Spacing = 200 kHz, V
DD
= 3.3 V, and V
P
= 5 V.
Specifications subject to change without notice.