LMX2335U Datasheet, PDF (1/48 Pages) National Semiconductor (TI) – PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications

November 2002
LMX2335U/LMX2336U
PLLatinum^™ Ultra Low Power Dual Frequency
Synthesizer for RF Personal Communications
LMX2335U 1.2 GHz/1.2 GHz
LMX2336U 2.0 GHz/1.2 GHz
General Description
The LMX2335U and LMX2336U devices are high perfor-
mance frequency synthesizers with integrated dual modulus
prescalers. The LMX2335U and LMX2336U devices are
designed for use in applications requiring two RF
phase-locked loops.
A 64/65 or a 128/129 prescale ratio can be selected for each
RF synthesizer. Using a proprietary digital phase locked loop
technique, the LMX2335U and LMX2336U devices generate
very stable, low noise control signals for the RF voltage
controlled oscillators. Both RF synthesizers include a
two-level programmable charge pump. The RF1 synthesizer
has dedicated Fastlock circuitry.
Serial data is transferred to the devices via a three wire
interface (Data, LE, Clock). Supply voltages from 2.7V to
5.5V are supported. The LMX2335U and the LMX2336U
feature very low current consumption:
LMX2335U (1.2 GHz)– 3.0 mA, LMX2336U (2.0 GHz)–
3.5 mA at 3.0V.
The LMX2335U device is available in 16-pin TSSOP, and
16-pin Chip Scale Package (CSP) surface mount plastic
packages. The LMX2336U device is available in 20-Pin
TSSOP, 24-Pin CSP, and 20-Pin UTCSP surface mount
plastic packages.
Features
n Ultra Low Current Consumption
n Upgrade and Compatible to the LMX2335L and
LMX2336L devices
n 2.7V to 5.5V operation
n Selectable Synchronous or Asynchronous Powerdown
Mode:
I_CC-PWDN = 1 µA typical at 3.0V
n Selectable Dual Modulus Prescaler
RF1: 64/65 or 128/129
RF2: 64/65 or 128/129
n Selectable Charge Pump TRI-STATE^® Mode
n Programmable Charge Pump Current Levels
RF1 and RF2: 0.95 or 3.8 mA
n Selectable Fastlock™ Mode for the RF1 Synthesizer
n Push-Pull Analog Lock Detect Mode
n LMX2335U is available in 16-Pin TSSOP and 16-Pin
CSP
n LMX2336U is available in 20-Pin TSSOP, 24-Pin CSP,
and 20-Pin UTCSP
Applications
n Mobile Handsets
(GSM, GPRS, W-CDMA, CDMA, PCS, AMPS, PDC,
DCS)
n Cordless Handsets (DECT, DCT)
n Wireless Data
n Cable TV Tuners
Thin Shrink Small Outline Package (MTC16)
Thin Shrink Small Outline Package (MTC20)
10136787
Chip Scale Package (SLB16A)
Chip Scale Package (SLB24A)
10136780
Ultra Thin Chip Scale Package
(SLE20A)
10136788
10136781
TRI-STATE^® is a registered trademark of National Semiconductor Corporation.
Fastlock™, MICROWIRE™ and PLLatinum™ are trademarks of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation DS101367
10136795
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