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LMX2485, LMX2485E
www.ti.com
SNAS236E – OCTOBER 2005 – REVISED FEBRUARY 2008
Electrical Characteristics (continued)
(VCC = 3.0V; -40°C ≤ TA ≤ +85°C unless otherwise specified)
Value
Symbol
Parameter
Conditions
Units
Min
Typ
Max
IF Charge Pump Source
ICPoutIFSRCE
VCPoutIF = VCC/2
3.5
mA
Current
IF Charge Pump Sink
ICPoutIFSINK
VCPoutIF = VCC/2
-3.5
mA
Current
IF Charge Pump TRI-
ICPoutIFTRI
0.5
≤ VCPoutIF ≤ VCC RF -0.5
2
10
nA
STATE Current Magnitude
Magnitude of IF CP Sink
VCPoutIF = VCC/2
| ICPoutIF%MIS |
1
8
%
vs. CP Source Mismatch
TA = 25°C
Magnitude of IF CP
0.5
≤ VCPoutIF ≤ VCC -0.5
| ICPoutIF%V |
4
10
%
Current vs. CP Voltage
TA = 25°C
Magnitude of IF CP
| ICPoutIF%TEMP
VCPoutIF = VCC/2
4
%
Current vs. Temperature
OSCILLATOR PARAMETERS
OSC2X = 0
5
110
MHz
Oscillator Operating
fOSCin
Frequency
OSC2X = 1
5
20
MHz
vOSCin
Oscillator Input Sensitivity
0.5
VCC
VP-P
IOSCin
Oscillator Input Current
-100
100
µA
SPURS
Spurs in band
(4)
-55
dBc
PHASE NOISE
RF_CPG = 0
-202
RF_CPG = 1
-202
RF Synthesizer
LF1HzRF
Normalized Phase Noise
RF_CPG = 3
-206
dBc/Hz
Contribution (5)
RF_CPG = 7
-208
RF_CPG = 15
-210
IF Synthesizer Normalized
LF1HzIF
-209
dBc/Hz
Phase Noise Contribution
DIGITAL INTERFACE (DATA, CLK, LE, ENOSC, CE, Ftest/LD, FLoutRF)
VIH
High-Level Input Voltage
1.6
VCC
V
VIL
Low-Level Input Voltage
0.4
V
IIH
High-Level Input Current
VIH = VCC
-1.0
1.0
µA
IIL
Low-Level Input Current
VIL = 0 V
-1.0
1.0
µA
VOH
High-Level Output Voltage IOH = -500 µA
VCC-0.4
V
VOL
Low-Level Output Voltage
IOL = 500 µA
0.4
V
MICROWIRE INTERFACE TIMING
Data to Clock Set Up
See MICROWIRE INPUT TIMING
tCS
25
ns
Time
DIAGRAM
See MICROWIRE INPUT TIMING
tCH
Data to Clock Hold Time
8
ns
DIAGRAM
See MICROWIRE INPUT TIMING
tCWH
Clock Pulse Width High
25
ns
DIAGRAM
(4)
In order to measure the in-band spur, the fractional word is chosen such that when reduced to lowest terms, the fractional numerator is
one. The spur offset frequency is chosen to be the comparison frequency divided by the reduced fractional denominator. The loop
bandwidth must be sufficiently wide to negate the impact of the loop filter. Measurement conditions are: Spur Offset Frequency = 10
kHz, Loop Bandwidth = 100 kHz, Fraction = 1/2000, Comparison Frequency = 20 MHz, RF_CPG = 7, DITH = 0, and a 4th Order
Modulator (FM = 0). These are relatively consistent over tuning range.
(5)
Normalized Phase Noise Contribution is defined as: LN(f) = L(f) – 20log(N) – 10log(fCOMP) where L(f) is defined as the single side band
phase noise measured at an offset frequency, f, in a 1 Hz Bandwidth. The offset frequency, f, must be chosen sufficiently smaller than
the PLL loop bandwidth, yet large enough to avoid substantial phase noise contribution from the reference source. Measurement
conditions are: Offset Frequency = 11 kHz, Loop Bandwidth = 100 kHz for RF_CPG = 7, Fraction = 1/2000, Comparison Frequency =
20 MHz, FM = 0, DITH = 0.
Copyright © 2005–2008, Texas Instruments Incorporated
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