Features Typical values unless otherwise specified. −3 dB bandwidth (VOUT = 0.80 VPP) 1.2 GHz ±0.5 dB gain flatness (VOUT = 0.80 VPP) 330 MHz Slew rate 1300 V/μs 2 nd/3 rd Harmonics (750 MHz) −53/−54 dBc Fixed gain 13.7 dB Supply current 120 mA Single supply operation 3.3V ±10% Adjustable common-mode output voltage Description The LMH6555 is an ultra high speed differential line driver with 53 dB SFDR at 750 MHz. The LMH6555 features a fixed gain of 13.7 dB. An input to the device allows the output common mode voltage to be set independent of the input common mode voltage in order to simplify the interface to high speed differential input ADCs. A unique architecture allows the device to operate as a fully differential driver or as a single-ended to differential converter. The outstanding linearity and drive capability (100Ω differential load) of this device are a perfect match for driving high speed analog-to-digital converters. When combined with the ADC081000/ ADC081500 (single or dual ADC), the LMH6555 forms an excellent 8-bit data acquisition system with analog bandwidths exceeding 750 MHz. The LMH6555 is offered in a space saving 16-pin LLP package. Applications Differential ADC driver National Semiconductor ADC081500/ ADC081000 (single or dual) driver Single ended to differential converter Intermediate frequency (IF) amplifier Communication receivers Oscilloscope front end

Also Recommended LMH6550▲ Lower Power, Lower BW (400 MHz) LMH6551▲ Lower Power, Lower BW Version (370 MHz) LMH6552▲ Lower Power, Adjustable Gain Version (1.5 GHz)

Typical Application *click for larger image	Block Diagram *click for larger image
Typical Performance click for larger image

Parameters / Values	LMH6555	LMH6550	LMH6551	LMH6552
Channels	1 Channels	1 Channels	1 Channels	1 Channels
Input OutputType	Diff In and Out	Diff In and Out	Diff In and Out	Diff In and Out
Gain Bandwidth	1200 MHz	400 MHz	370 MHz	1000 MHz
Slew Rate	1300 Volts/usec	3000 Volts/usec	2400 Volts/usec	3800 Volts/usec
Supply Min	3 Volt	5 Volt	3 Volt	4.5 Volt
Supply Max	3.6 Volt	12 Volt	12 Volt	12 Volt
Offset Voltage max, 25C	50 mV	5 mV	5 mV	16.5 mV
Supply Current Per Channel	120 mA	20 mA	12.5 mA	19 mA
PowerWise Rating 2	100 uA/MHz	50 uA/MHz	33.8 uA/MHz	12.7 uA/MHz
Voltage Noise	3.9 nV/root(Hz)	6 nV/root(Hz)	6 nV/root(Hz)	1.1 nV/root(Hz)
Feedback Type	Current	Voltage	Voltage	Current
Av+5 BW	1200 MHz	80 MHz	74 MHz	800 MHz
Special Features	Adj VCM, Fixed 13.7 dB Gain	Differential in, Differential out	Differential in, Differential out	Differential in, Differential out
Function	Driver	Op Amp	Op Amp	Op Amp
Temperature Min	-40 deg C	-40 deg C	-40 deg C	-40 deg C
Temperature Max	85 deg C	85 deg C	85 deg C	85 deg C
PowerWise	Yes	Yes	Yes	Yes

Datasheets

Title		Size	Date	Other Language
	LMH6555 Low Distortion 1.2 GHz Differential Driver	691 Kbytes	30-Mar-11	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1615: Application Note 1615 LMH6555 Evaluation Board	1307 Kbytes	22-Jun-07	日本語
	AN-1704: Application Note 1704 LMH6555 Application as High Speed ADC Input Driver	141 Kbytes	20-Sep-07	日本語 中文

Other Technical Documents

Title		Type	Date
	Adaptive Speed Control for Automotive Systems	Signal Path Designer	2007-11-20
	Interfacing High-speed Data Converters	External Article	2008-04-18
	Taking the 'Black Magic' Out of RF Design	External Article	2008-07-01
	Use In-the-loop Gain Control to Extend Dynamic Range	External Article	2007-09-24
	Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths	Signal Path Designer	2007-09-13

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH6555SQ/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1620 DIGI-KEY Worldwide 1246 RS COMPONENTS Worldwide 199 TAYLOR Americas 1620	$5.70 each at 1K+ pcs	reel of 1000
LMH6555SQE/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 250 DIGI-KEY Worldwide 0 MOUSER Worldwide 176 RS COMPONENTS Worldwide 44	$5.70 each at 1K+ pcs	reel of 250
LMH6555SQX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$5.70 each at 1K+ pcs	reel of 4500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH6555.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH6555 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMH6555EVAL/NOPB	LMH6555 Evaluation board	Full production Lead Free (RoHS)	Distributor Region Qty AVNET-EM Worldwide 2 DIGI-KEY Worldwide 0 MOUSER Worldwide 1 TAYLOR Americas 3	$50.00 each	1
Thank you for your interest in National Semiconductor's 1.2 GHz Low Distortion Differential Driver, the LMH6555. The LMH6555 is specifically designed to work with National's Ultra High Speed Data Converters, such as the ADC08(D)1000/1020, ADC08(D)1500/1520, and the ADC08(B)3000 products. Together with these data converters, the LMH6555 delivers 50 dB SFDR @ 750 MHz, making it ideal for many of today's 8-bit data acquisition systems. Contents: Evaluation Board for the LMH6555 LMH6555 Datasheet Application Note AN-1615

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMH6555SQ/NOPB	39.461	LLP	16	3	260	Detail	Download	spice file	NS UZXYTT L6555SQ
LMH6555SQE/NOPB	39.461	LLP	16	3	260	Detail	Download	spice file	NS UZXYTT L6555SQ
LMH6555SQX/NOPB	39.461	LLP	16	3	260	Detail	Download	spice file	NS UZXYTT L6555SQ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH6555.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH6555 is located at RoHS Status.

Reference Design

RD-143 - Lowest Power 8-bit 3 GSPS Data Acquisition System

CAD Symbols and Models Download LMH6555 CAD Symbols

Models spice file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMH6555SQ	BICMOS8B+	0	3632	0	0	2762292	2	783807897
LMH6555SQE	BICMOS8B+	0	3632	0	0	2762292	2	783807897
LMH6555SQX	BICMOS8B+	0	3632	0	0	2762292	2	783807897

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMH6555.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMH6555 is located at RoHS Status.