LMX5080 National Semiconductor, LMX5080 Datasheet

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LMX5080

Manufacturer Part Number
LMX5080
Description
PLLatinum 2.7 GHz Low Power Dual Modulus Prescaler for RF Personal Communications
Manufacturer
National Semiconductor
Datasheet

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Part Number
Manufacturer
Quantity
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Part Number:
LMX5080MA
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LMX5080MAX
Manufacturer:
NS/国半
Quantity:
20 000
© 1999 National Semiconductor Corporation
LMX5080
PLLatinum
Prescaler for RF Personal Communications
General Description
The LMX5080 integrated dual modulus prescaler, is de-
signed to be used in a synthesized local oscillator for
2.5 GHz wireless transceivers. It is fabricated using Nation-
al’s 0.5µ ABiCV silicon BiCMOS process. The LMX5080 con-
tains three dual modulus prescalers. Either a 128/130,
256/158 or a 512/514 prescaler can be selected for up to
2.7 Gz RF input frequencies. The prescaler inputs can be
driven either differentially, or single ended with the use of a
coupling capacitor on one of the inputs to ground. The
LMX5080 CMOS output is optimized to generate very stable,
low switching noise output signals. The LMX5080 prescaler
can be used in conjunction with a low frequency Phase Lock
Loop to form a frequency synthesizer suitable for UHF trans-
ceivers. Supply voltage can range from 2.7V to 5.5V. The
LMX5080 features low current consumption; typically 7.0 mA
at 5V V
The LMX5080 is available in a 8-pin Small Outline (SOP)
surface mount plastic package.
Functional Block Diagram
PLLatinum
CC
is a trademark of National Semiconductor Corporation.
2.7 GHz Low Power Dual Modulus
DS100940
Features
n 2.7V to 5.5V operation
n Low current consumption: 7 mA (typ)
n −40˚C to +85˚C low noise CMOS output
n Selectable dual modulus prescaler
n 8-pin small package outline (SOP)
Applications
n 2.5 GHz wireless communications systems (ISM)
n Direct Broadcast Satellite systems (DBS)
n Cable TV tuners (CATV)
128/130
256/258
512/514
DS100940-1
PRELIMINARY
@
5V
www.national.com
April 1999

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LMX5080 Summary of contents

Page 1

... Loop to form a frequency synthesizer suitable for UHF trans- ceivers. Supply voltage can range from 2.7V to 5.5V. The LMX5080 features low current consumption; typically 7 The LMX5080 is available in a 8-pin Small Outline (SOP) surface mount plastic package. Functional Block Diagram PLLatinum ™ trademark of National Semiconductor Corporation. ...

Page 2

... SW2 8 IN www.national.com Small Outline Package (SOP) DS100940-2 NS Package Number M08A Order Number LMX5080M, LMX5080MX I/O Description I RF small signal prescaler input. Small signal input from the voltage controlled oscillator — Power Supply voltage input may range from 2.7V to 5.5V. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Value Parameter Symbol Min Typ Power Supply Voltage V −0.3 CC Voltage on any pin with GND = 0V V −0.3 i Storage Temperature Range T −65 S Lead Temp. ...

Page 4

... The basic phase-lock-loop (PLL) configuration using an ex- ternal prescaler consists of a high-stability crystal reference oscillator, a prescaler such as the National Semiconductor LMX5080, a low frequency synthesizer, a voltage controlled oscillator (VCO), and a loop filter. The frequency synthesizer typically includes programmable reference [R] and feedback [N] frequency dividers, a phase detector, as well as a charge pump ...

Page 5

Modulus Control Truth Table SW1 SW2 Note: SW1, SW2 Timing Diagram ...

Page 6

Typical Performance Characteristics 1/128 25˚C A Input Impedance (S11) vs Frequency = 2.7V to 5.5V 100 MHz to 2.7 GHz Marker 1 = 100 MHz, Real ...

Page 7

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. Order Number LMX5080M For Tape and Reel Order Number LMX5080MX NS Package Number M08A 2. A critical component is any component of a life ...

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