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LMX2492 bảng dữ liệu(PDF) 5 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Low Noise Fractional N PLL
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LMX2492 bảng dữ liệu(HTML) 5 Page - Texas Instruments

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LMX2492, LMX2492-Q1
www.ti.com
SNAS624B – MARCH 2014 – REVISED MAY 2015
7.6 Electrical Characteristics
(3.15 V
≤ Vcc ≤ 3.45 V. Vcc ≤Vcp ≤5.25 V. Typical values are at Vcc = Vcp = 3.3 V, 25 °C.
-40°C
≤ TA ≤ 85 °C for the LMX2492 and -40°C ≤ TA ≤ 125 °C for the LMX2492-Q1 ; except as specified.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Fpd = 10 MHz
45
All Vcc Pins
Fpd = 100 MHz
50
Fpd = 200 MHz
55
Icc
Current Consumption
Kpd = 0.1 mA
2
mA
Vcp Pin
Kpd = 1.6 mA
10
Kpd = 3.1 mA
19
IccPD
Current
POWERDOWN
3
OSC_DIFFR=0, Doubler Disabled
10
600
OSC_DIFFR=0, Doubler Enabled
10
300
Frequency for OSCin
fOSCin
MHz
terminal
OSC_DIFFR=1, Doubler Disabled
10
1200
OSC_DIFFR=1, Doubler Enabled
10
600
LMX2492-Q1 Version Only
Single Ended XO
0.24
Vcc-0.5
vOSCin
Voltage for OSCin Pin(1)
Vpp
30 MHz
≤ fOSCin ≤ 100 MHz
All Other Cases
0.5
Vcc-0.5
fFin
Frequency for FinPin(2)
500
14000
MHz
pFin
Power for Fin Pin
Single-Ended Operation
-5
5
dBm
fPD
Phase Detector Frequency
200
MHz
PN1Hz
PLL Figure of Merit(3)
-227
dBc/Hz
Normalized PLL 1/f
Normalized to 10 kHz offset for a 1 GHz
PN10kHz
-120
dBc/Hz
Noise(3)
carrier.
Charge Pump Leakage Tri-
ICPoutTRI
10
nA
state Leakage
ICPoutMM
Charge Pump Mismatch(4)
VCPout = Vcp / 2
5 %
CPG=1X
0.1
ICPout
Charge Pump Current
VCPout = Vcp / 2 …
mA
CPG=31X
3.1
(1)
For optimal phase noise performance, a slew rate of at least 3 V/ns is recommended
(2)
Tested to 13.5 GHz, Guaranteed to 14 GHz by characterization
(3)
PLL Noise Metrics are measured with a clean OSCin signal with a high slew rate using a wide loop bandwidth. The noise metrics model
the PLL noise for an infinite loop bandwidth as:
PLL_Total = 10×log( 10PLL_Flat/10 + 10PLL_Flicker(Offset)/10)
PLL_Flat = PN1Hz + 20×log(N) + 10×log(Fpd/1Hz)
PLL_Flicker = PN10kHz - 10×log(Offset/10kHz) + 20×log(Fvco/1GHz)
(4)
Charge pump mismatch varies as a function of charge pump voltage. Consult typical performance characteristics to see this variation.
Copyright © 2014–2015, Texas Instruments Incorporated
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Product Folder Links: LMX2492 LMX2492-Q1


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