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LMX2335LM-LMX2336LSLB
PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Personal Communications
LMX2335L/LMX2336L
PLLatinum™ Low Power Dual Frequency Synthesizer for Personal Communications
LMX2335L 1.1 GHz/1.1 GHz
LMX2336L 2.0 GHz/1.1 GHz
General DescriptionThe LMX2335Land LMX2336Lare monolithic, integrated
dual frequency synthesizers, includingtwo high frequency
prescalers,andare designedfor applications requiringtwo phase-lock loops. Theyare fabricated using National’s
0.5μ ABiCV silicon BiCMOS process.
The LMX2335L/36Lcontains twodual modulusprescalers.A
64/65ora 128/129 prescalercanbe selectedfor eachRF
synthesizer.A second reference divider chainis includedin
theICfor improved system noise.The LMX2335L/36L com-
bined witha high quality reference oscillator,two loop filters,
and two external voltage controlled oscillators generates
very stablelow noiseRF local oscillator signals.
Serial datais transferredintothe LMX2335L/36Lviaa three
wire interface (Data, Enable, Clock). Supply voltage can
range from 2.7Vto 5.5V. The LMX2335L/36L feature very
low current consumption; LMX2335L 4.0 mAat 5V,
LMX2336L5.5mAat5V.The LMX2335Lis availableinSO,
TSSOP and CSP 16-pin surface mount plastic packages.
The LMX2336Lis availableina TSSOP 20-pin and CSP
24-pin surface mount plastic package.
Features Ultralow current consumption 2.7Vto 5.5V operation Selectable synchronousand asynchronous powerdown
mode:
ICC=1μA (typ) Dual modulus prescaler: 64/65or 128/129 Selectable charge pump TRI-STATE® mode Selectable charge pump current levels Selectable Fastlock™ mode Upgradeand compatibleto LMX2335/36 Small-outline, plastic, surface mount TSSOP package LMX2336 availablein CSP package
Applications Cellular telephone systems (AMPS, ETACS, RCR-27) Cordless telephone systems
(DECT, ISM, PHS, CT-1+) Personal Communication Systems
(DCS-1800, PCN-1900) Dual Mode PCS phones CableTV Tuners (CATV) Other wireless communication systems
Functional Block DiagramTRI-STATE®isa registeredtrademark ofNationalSemiconductorCorporation.
Fastlock™, MICROWIRE™and PLLatinum™are trademarks ofNationalSemiconductor Corporation.
DS012807-1
PRELIMINARYJune 1999
LMX2335L/LMX2336L
PLLatinum
Low
Power
Dual
Frequency
Synthesizer
for
Personal
Communications 1999 National Semiconductor Corporation DS012807
