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National Semiconductor Electronic Components Datasheet

LM2335LTM Datasheet

PLLatinum Low Power Dual Frequency Synthesizer for RF Personal Communications

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LM2335LTM pdf
PRELIMINARY
June 1999
LMX2335L/LMX2336L
PLLatinumLow Power Dual Frequency Synthesizer for
RF Personal Communications
LMX2335L
LMX2336L
1.1 GHz/1.1 GHz
2.0 GHz/1.1 GHz
General Description
The LMX2335L and LMX2336L are monolithic, integrated
dual frequency synthesizers, including two high frequency
prescalers, and are designed for applications requiring two
RF phase-lock loops. They are fabricated using National’s
0.5µ ABiC V silicon BiCMOS process.
The LMX2335L/36L contains two dual modulus prescalers. A
64/65 or a 128/129 prescaler can be selected for each RF
synthesizer. A second reference divider chain is included in
the IC for improved system noise. The LMX2335L/36L com-
bined with a high quality reference oscillator, two loop filters,
and two external voltage controlled oscillators generates
very stable low noise RF local oscillator signals.
Serial data is transferred into the LMX2335L/36L via a three
wire interface (Data, Enable, Clock). Supply voltage can
range from 2.7V to 5.5V. The LMX2335L/36L feature very
low current consumption; LMX2335L 4.0 mA at 5V,
LMX2336L 5.5 mA at 5V. The LMX2335L is available in SO,
TSSOP and CSP 16-pin surface mount plastic packages.
The LMX2336L is available in a TSSOP 20-pin and CSP
24-pin surface mount plastic package.
Features
n Ultra low current consumption
n 2.7V to 5.5V operation
n Selectable synchronous and asynchronous powerdown
mode:
ICC = 1 µA (typ)
n Dual modulus prescaler: 64/65 or 128/129
n Selectable charge pump TRI-STATE® mode
n Selectable charge pump current levels
n Selectable Fastlockmode
n Upgrade and compatible to LMX2335/36
n Small-outline, plastic, surface mount TSSOP package
n LMX2336 available in CSP package
Applications
n Cellular telephone systems (AMPS, ETACS, RCR-27)
n Cordless telephone systems
(DECT, ISM , PHS, CT-1+)
n Personal Communication Systems
(DCS-1800, PCN-1900)
n Dual Mode PCS phones
n Cable TV Tuners (CATV)
n Other wireless communication systems
Functional Block Diagram
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
Fastlock, MICROWIREand PLLatinumare trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012807
DS012807-1
www.national.com


National Semiconductor Electronic Components Datasheet

LM2335LTM Datasheet

PLLatinum Low Power Dual Frequency Synthesizer for RF Personal Communications

No Preview Available !

LM2335LTM pdf
Connection Diagrams
LMX2335L
(Top View)
LMX2336L
(Top View)
DS012807-2
Order Number LMX2335LM or LM2335LTM
NS Package Number M16A and MTC16
LMX2335L
(Top View)
DS012807-3
Order Number LMX2336LTM
NS Package Number MTC20
LMX2336L
(Top View)
DS012807-38
Order Number LMX2335LSLB
NS Package Number SLB16A
Pin Descriptions
DS012807-36
Order Number LMX2336LSLB
NS Package Number SLB24A
Pin No. Pin No. Pin No. Pin No.
Pin I/O
Description
2336LTM 2336LSLB 2335LTM 2335LSLB Name
1
24
1
16 VCC1
Power supply voltage input for RF1 analog and RF1 digital
circuits. Input may range from 2.7V to 5.5V. VCC1 must equal
VCC2. Bypass capacitors should be placed as close as possible
to this pin and be connected directly to the ground plane.
2 2 2 1 Vp1 Power supply for RF1 charge pump. Must be VCC.
3 3 3 2 Do1 O RF1 charge pump output. For connection to a loop filter for
driving the input of an external VCO.
4
4
4
3 GND
LMX2335L: Ground for RF1 analog and RF1 digital circuits.
LMX2336L: Ground for RF digital circuits.
5
5
5
4
fIN 1
I RF1 prescaler input. Small signal input from the VCO.
6
6
X
X
/fIN 1
I RF1 prescaler complementary input. A bypass capacitor should
be placed as close as possible to this pin and be connected
directly to the ground plane. Capacitor is optional with loss of
some sensitivity.
7
7
X
X GND
Ground for RF1 analog circuitry.
www.national.com
2


Part Number LM2335LTM
Description PLLatinum Low Power Dual Frequency Synthesizer for RF Personal Communications
Maker National Semiconductor
Total Page 22 Pages
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