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LMX2512LQ0967 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMX2512LQ0967
Description  PLLatinum??Frequency Synthesizer System with Integrated VCO
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2512LQ0967 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LMX2502/LMX2512
PLLatinumFrequency Synthesizer System with
Integrated VCO
General Description
LMX2502 and LMX2512 are highly integrated, high perfor-
mance, low power frequency synthesizer systems optimized
for Korean PCS and Korean Cellular CDMA (1xRTT, IS-95)
mobile handsets. Using a proprietary digital phase locked
loop technique, LMX2502 and LMX2512 generate very
stable, low noise local oscillator signals for up and down
conversion in wireless communications devices.
LMX2502 and LMX2512 include a voltage controlled oscil-
lator (VCO), a loop filter, and a fractional-N RF PLL based on
a delta sigma modulator. In concert these blocks form a
closed loop RF synthesizer system. LMX2502 supports the
Korean PCS band and LMX2512 supports the Korean Cel-
lular band.
LMX2502 and LMX2512 include an Integer-N IF PLL also.
For more flexible loop filter designs, the IF PLL includes a
4-level programmable charge pump. Together with an exter-
nal VCO and loop filter, LMX2502 and LMX2512 make a
complete closed loop IF synthesizer system.
Serial data is transferred to the device via a three-wire
MICROWIRE interface (DATA, LE, CLK).
Operating supply voltage ranges from 2.7 V to 3.3 V.
LMX2502 and LMX2512 feature low current consumption:
17 mA at 2.8 V.
LMX2502 and LMX2512 are available in a 28-pin leadless
leadframe package (LLP).
Features
n
Small Size
5.0 mm X 5.0 mm X 0.75 mm 28-Pin LLP Package
n
RF Synthesizer System
Integrated RF VCO
Integrated Loop Filter
Low Spurious, Low Phase Noise Fractional-N RF PLL
Based on 11-Bit Delta Sigma Modulator
10 kHz Frequency Resolution
n
IF Synthesizer System
Integer-N IF PLL
Programmable Charge Pump Current Levels
Programmable Frequency
n
Supports Various Reference Frequencies
19.20/19.68 MHz
n
Fast Lock Time: 500 µs
n
Low Current Consumption
17 mA at 2.8 V
n
2.7 V to 3.3 V Operation
n
Digital Filtered Lock Detect Output
n
Hardware and Software Power Down Control
Applications
n
Korean PCS CDMA Systems
n
Korean Cellular CDMA Systems
Functional Block Diagram
20068001
PLLatinumis a trademark of National Semiconductor Corporation.
June 2003
© 2003 National Semiconductor Corporation
DS200680
www.national.com


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