Electronic Components Datasheet Search |
|
LMX2485 Datasheet(PDF) 5 Page - Texas Instruments |
|
|
LMX2485 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 43 page 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 Submit Documentation Feedback 5 Product Folder Links: LMX2485 LMX2485E |
Similar Part No. - LMX2485 |
|
Similar Description - LMX2485 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |