LMH2180TM National Semiconductor, LMH2180TM Datasheet

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LMH2180TM

Manufacturer Part Number
LMH2180TM
Description
Manufacturer
National Semiconductor
Datasheet
1.LMH2180TM.pdf (16 pages)

Specifications of LMH2180TM

Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Lead Free Status / RoHS Status
Supplier Unconfirmed

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
LMH2180TM/NOPB
Manufacturer:
NS
Quantity:
528
© 2010 National Semiconductor Corporation
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. This part does not use an internal
ground reference, thus providing additional system flexibility.
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. Each input
is internally biased to 1V, removing the need for external re-
sistors. 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 packages min-
imizing the required PCB space.
Typical Application
300246
LMH2180
Features
(Typical values are: V
otherwise specified.)
■
■
■
■
■
■
■
■
■
■
■
■
Applications
■
■
■
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Small signal bandwidth
Supply voltage range
Phase noise (V
f
Slew rate
Total supply current
Shutdown current
Rail-to-rail input and output
Individual buffer enable pins
Rapid T
Crosstalk rejection circuitry
Packages:
— 8-Pin LLP, Solder Bump and no Pullback
— 8-Bump micro SMD
Temperature range
3G mobile applications
WLAN–WiMAX modules
TD_SCDMA multi-mode MP3 and camera
GSM modules
Oscillator modules
C
= 38.4 MHz, Δf = 1 kHz)
on
technology
IN
= 1 V
SUPPLY
PP
,
= 2.7V and C
30024602
L
= 10 pF, unless
−40°C to 85°C
www.national.com
July 15, 2010
−123 dBc/Hz
2.4V to 5V
106 V/μs
78 MHz
2.3 mA
30 µA

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LMH2180TM Summary of contents

Page 1

... The LMH2180 is produced in the tiny packages min- imizing the required PCB space. Typical Application © 2010 National Semiconductor Corporation LMH2180 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 Junction Temperature (Note 3) 2 ...

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 (Note 10, Note 11) V Enable High ...

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

... LLP Top View Ordering Information Package Part Number LMH2180YD 8-Pin LLP Solder Bump LMH2180YDX LMH2180SD 8-Pin LLP LMH2180SDE No Pullback LMH2180SDX LMH2180TM 8-Bump micro SMD LMH2180TMX V Voltage supply connection Input Input 2 Enable buffer 2 V Ground connection SS OUT 2 Output 2 OUT 1 Output 1 Enable buffer 1 ...

Page 6

Typical Performance Characteristics kΩ and nF, 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 ...

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

SMD NS Package Number TMD08AAA X1 = 1.215 ± 0.030 mm 1.215 ± 0.030 mm 0.600 ± 0.075 mm 15 www.national.com ...

Page 16

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

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