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LMX2485Q-Q1
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SNOSCP7A – MARCH 2013 – REVISED JANUARY 2016
6.6 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted). (VCC = 3V; -40°C ≤ TA ≤ +105°C unless otherwise
specified).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Icc PARAMETERS
IF PLL OFF
Power supply current, RF
ICCRF
RF PLL ON
3.3
mA
synthesizer
Charge Pump TRI-STATE
IF PLL ON
Power supply current, IF
ICCIF
RF PLL OFF
1.7
mA
synthesizer
Charge Pump TRI-STATE
IF PLL ON
Power supply current, entire
ICCTOTAL
RF PLL ON
5
mA
synthesizer
Charge Pump TRI-STATE
CE = ENOSC = 0V
ICCPD
Power-down current
1
10
µA
CLK, DATA, LE = 0V
RF SYNTHESIZER PARAMETERS
RF_P = 8
500
2000
fFinRF
Operating frequency(1)
MHz
RF_P = 16
500
3100
pFinRF
Input sensitivity
-15
0
dBm
fPD
Phase detector frequency(2)
50
MHz
RF_CPG = 0
95
VCPoutRF = VCC/2
RF_CPG = 1
190
RF charge pump source
VCPoutRF = VCC/2
ICPoutRFSRCE
µA
current(3)
...
...
RF_CPG = 15
1520
VCPoutRF = VCC/2
RF_CPG = 0
–95
VCPoutRF = VCC/2
RF_CPG = 1
–190
VCPoutRF = VCC/2
ICPoutRFSINK
RF charge pump sink current(3)
µA
...
...
RF_CPG = 15
–1520
VCPoutRF = VCC/2
RF charge pump TRI-STATE
ICPoutRFTRI
0.5
≤ VCPoutRF ≤ VCC – 0.5
2
10
nA
current magnitude
RF_CPG > 2
3%
10%
Magnitude of RF CP sink vs
VCPoutRF = VCC/2
| ICPoutRF%MIS |
CP source mismatch
TA = 25°C
RF_CPG
≤ 2
3%
13%
Magnitude of RF CP current vs
| ICPoutRF%T |
VCPoutRF = VCC/2
4%
temperature
IF SYNTHESIZER PARAMETERS
fFinIF
Operating Frequency
75
800
MHz
pFinIF
IF Input Sensitivity
-10
5
dBm
fCOMP
Phase Detector Frequency
10
MHz
IF Charge Pump Source
ICPoutIFSRCE
VCPoutIF = VCC/2
3.5
mA
Current
ICPoutIFSINK
IF Charge Pump Sink Current
VCPoutIF = VCC/2
–3.5
mA
IF Charge Pump TRI-STATE
ICPoutIFTRI
0.5
≤ VCPoutIF ≤ VCC RF -0.5
2
10
nA
Current Magnitude
Magnitude of IF CP sink vs CP
VCPoutIF = VCC/2
| ICPoutIF%MIS |
1%
8%
source mismatch
TA = 25°C
(1)
A slew rate of at least 100 V/uS is recommended for frequencies below 500 MHz for optimal performance.
(2)
For Phase Detector Frequencies above 20 MHz, Cycle Slip Reduction (CSR) may be required. Legal divide ratios are also required.
(3)
Refer to table in Table 25 for complete listing of charge pump currents.
Copyright © 2013–2016, Texas Instruments Incorporated
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