LMH2180YD National Semiconductor, LMH2180YD Datasheet

LMH2180YD

Manufacturer Part Number

LMH2180YD

Description

IC, CLOCK BUFFER, DUAL, 75MHZ

Manufacturer

National Semiconductor

Datasheet

1.LMH2180YD.pdf (16 pages)

Specifications of LMH2180YD

Clock Ic Type

Clock Buffer

Frequency

75MHz

No. Of Outputs

Supply Current

2.3mA

Supply Voltage Range

2.4V To 5V

Digital Ic Case Style

LLP

No. Of Pins

Operating Temperature Range

-40Â°C To

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LMH2180YD/NOPB

Manufacturer:

National Semiconductor

Quantity:

1 944

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LMH2180YD/NOPB

Manufacturer:

Quantity:

6 223

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LMH2180YDX/NOPB

Manufacturer:

ALLEGRO

Quantity:

6 218

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Download datasheet (508Kb)

LMH2180

75 MHz Dual Clock Buffer

General Description

The LMH2180 is a high speed dual clock buffer designed for

portable communications and applications requiring multiple

accurate multi-clock systems. The LMH2180 integrates two

75 MHz low noise buffers with independent shutdown pins

into a small package. The LMH2180 ensures superb system

operation between the baseband and the oscillator signal

path by eliminating crosstalk between the multiple clock sig-

nals.

Unique technology and design provides the LMH2180 with

the ability to accurately drive both large capacitive and resis-

tive loads. Low supply current combined with shutdown pins

for each channel means the LMH2180 is ideal for battery

powered applications. The LMH2180's rapid recovery after

disable optimizes performance and current consumption.

This part does not use an internal ground reference, thus pro-

viding additional system flexibility. The LMH2180 operates

both with single and split supplies.

The flexible buffers provide system designers the capacity to

manage complex clock signals in the latest wireless applica-

tions. Each buffer delivers 106 V/μs internal slew rate with

independent shutdown and duty cycle precision. The patent-

ed analog circuit of each buffer drives capacitive loads greater

than 20 pF. Each input is internally biased to 1V, removing

the need for external resistors. Both channels have rail-to-rail

inputs and outputs, a gain of one, and are AC coupled with

the use of one capacitor.

Replacing a discrete buffer solution with the LMH2180 pro-

vides many benefits: simplified board layout, minimized par-

asitic components, simplified BOM, design durability across

multiple applications, simplification of clock paths, and the

ability to reduce the number of clock signal generators in the

system. The LMH2180 is produced in the tiny 8-pin LLP solder

bump and no pullback packages minimizing the required PCB

space. National’s advanced packaging offers direct PCB-IC

evaluation via pin access.

Typical Application

300246

Features

(Typical values are: V

otherwise specified.)

■

Applications

■

Small signal bandwidth

Supply voltage range

Phase noise (V

Slew rate

Total supply current

Shutdown current

Rail-to-rail input and output

Individual buffer enable pins

Rapid T

Crosstalk rejection circuitry

8-pin LLP, pin access packaging

Temperature range

3G mobile applications

WLAN–WiMAX modules

TD_SCDMA multi-mode MP3 and camera

GSM modules

Oscillator modules

= 38.4 MHz, Δf = 1kHz)

technology

= 1 V

SUPPLY

= 2.7V and C

30024602

January 24, 2008

= 10 pF, unless

−40°C to 85°C

www.national.com

-123dBc/Hz

2.4V to 5V

106 V/μs

78 MHz

2.3 mA

30 µA

Related parts for LMH2180YD

LMH2180YD Summary of contents

Page 1

... The LMH2180 is produced in the tiny 8-pin LLP solder bump and no pullback packages minimizing the required PCB space. National’s advanced packaging offers direct PCB-IC evaluation via pin access. Typical Application © 2008 National Semiconductor Corporation Features (Typical values are: V otherwise specified.) ■ ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltages (V + – V − ) ESD Tolerance Human Body (Note 4) Machine Model (Note 5) Charged Device Model Storage Temperature Range 2.7V Electrical Characteristics ...

Page 3

Symbol Parameter Miscellaneous Performance R Input Resistance per Buffer IN C Input Capacitance per Buffer IN Z Input Impedance IN V Output Swing Positive O Output Swing Negative I Output Short-Circuit Current SC (Notes 10, 11) V Enable High Active ...

Page 4

Symbol Parameter PSRR Power Supply Rejection Ratio A Small Signal Voltage Gain CL V Output Offset Voltage Temperature Coefficient Output OS Offset Voltage (Note 9) R Output Resistance OUT Miscellaneous Performance R Input Resistance per Buffer IN ...

Page 5

... Enable buffer 2 Ground connection SS Output 2 Output 1 Enable buffer 1 8-Pin LLP Top View Package Marking 1k Units Tape and Reel LMH2180YD 4.5k Units Tape and Reel 1k Units Tape and Reel LMH2180SD 4.5 Units Tape and Reel 5 30024601 Description 30024631 Transport Media NSC Drawing ...

Page 6

Typical Performance Characteristics R = 30kΩ and C = 10nF, unless otherwise specified. L COUPLING Frequency Response Frequency Response Over Temperature Phase Response Over Temperature www.national.com T = 25° 2.7V Phase Response 30024603 Frequency ...

Page 7

Large Signal Bandwidth Voltage Noise Isolation Output to Input vs. Frequency Gain Flatness < 0.1 dB (GFN) 30024609 Phase Noise 30024611 Crosstalk Rejection vs. Frequency 30024613 7 30024610 30024612 30024614 www.national.com ...

Page 8

Transient Response Positive Small Signal Pulse Response Large Signal Response www.national.com Transient Response Negative 30024615 Small Signal Pulse Response 30024617 Large Signal Response 30024619 8 30024616 30024618 30024620 ...

Page 9

I vs. V SUPPLY SUPPLY 30024621 I vs. V SUPPLY SUPPLY 30024623 V vs SUPPLY 30024625 I vs. V SUPPLY SUPPLY PSRR vs. Frequency R vs. Frequency OUT 9 30024622 30024624 30024626 www.national.com ...

Page 10

Input Impedance vs. Frequency V vs. I (Sourcing) OUT OUT V vs. I (Sinking) OUT OUT www.national.com V OUT 30024627 V OUT 30024629 I Sourcing vs 30024632 10 vs. I (Sourcing) OUT 30024628 vs. I (Sinking) OUT 30024630 ...

Page 11

I Sinking vs. V Over Temperature SC SUPPLY I vs. V SUPPLY ENABLE I SUPPLY 30024634 30024636 11 vs. V ENABLE 30024635 www.national.com ...

Page 12

Application Information GENERAL The LMH2180 is designed to minimize the effects of spurious signals from the base chip to the oscillator. Also the influence of varying load resistance and capacitance to the oscillator is minimized, while the drive capability is ...

Page 13

PHASE NOISE A clock buffer adds noise to the clock signal. This noise caus- es uncertainty in the phase of the clock signal. This uncer- tainty is described by jitter (time domain) or phase noise (frequency domain). Communication systems, such ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 8-Pin LLP NS Package Number YDA08A 8–Pin LLP NS Package Number SDA08A 14 ...

Page 15

Notes 15 www.national.com ...

Page 16

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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