Datasheet

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LMH6550

www.ti.com

SNOSAK0H –DECEMBER 2004–REVISED MARCH 2013

LMH6550 Differential, High Speed Op Amp

Check for Samples: LMH6550

FEATURES

DESCRIPTION

The LMH™6550 is a high performance voltage

• 400 MHz −3 dB Bandwidth (V

OUT

= 0.5 V

)

feedback differential amplifier. The LMH6550 has the

• 90 MHz 0.1 dB Bandwidth

high speed and low distortion necessary for driving

• 3000 V/µs Slew Rate

high performance ADCs as well as the current

handling capability to drive signals over balanced

• 8 ns Settling Time to 0.1%

transmission lines like CAT 5 data cables. The

• −92/−103 dB HD2/HD3 @ 5 MHz

LMH6550 can handle a wide range of video and data

• 10 ns Shutdown/Enable

formats.

With external gain set resistors, the LMH6550 can be

APPLICATIONS

used at any desired gain. Gain flexibility coupled with

• Differential AD Driver

high speed makes the LMH6550 suitable for use as

an IF amplifier in high performance communications

• Video Over Twisted Pair

equipment.

• Differential Line Driver

The LMH6550 is available in the space saving SOIC

• Single End to Differential Converter

and VSSOP packages.

• High Speed Differential Signaling

• IF/RF Amplifier

• SAW Filter Buffer/Driver

Typical Application

Figure 1. Single Ended to Differential ADC Driver

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2LMH is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (25 pages)

PAGE 1
LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 LMH6550 Differential, High Speed Op Amp Check for Samples: LMH6550 FEATURES DESCRIPTION 1 • • • • • • 23 The LMH™6550 is a high performance voltage feedback differential amplifier. The LMH6550 has the high speed and low distortion necessary for driving high performance ADCs as well as the current handling capability to drive signals over balanced transmission lines like CAT 5 data cables.
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LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com Connection Diagram 1 8 +IN -IN 2 VCM - + 7 3 6 4 5 V+ +OUT EN V- -OUT Figure 2. 8-Pin SOIC & VSSOP - Top View See Package Number D0008A & DGK0008A These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 ±5V Electrical Characteristics (1) Single ended in differential out, TA = 25°C, VS = ±5V, VCM = 0V, RF = RG = 365Ω, RL = 500Ω; Unless specified. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (2) Typ (3) Max (2) Units AC Performance (Differential) SSBW Small Signal −3 dB Bandwidth VOUT = 0.
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LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com ±5V Electrical Characteristics (1) (continued) Single ended in differential out, TA = 25°C, VS = ±5V, VCM = 0V, RF = RG = 365Ω, RL = 500Ω; Unless specified. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions VCM CMRR Min VID = 0V, 1V Step on VCM Pin, Measure VOD (2) Typ (3) Max (2) Units 70 75 ΔVO,CM/ΔVCM 0.995 0.997 Output Voltage Swing Peak to Peak, Differential 7.38 7.18 7.
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LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 5V Electrical Characteristics (1) (continued) Single ended in differential out, TA = 25°C, AV = +1, VS = 5V, VCM = 2.5V, RF = RG = 365Ω, RL = 500Ω; Unless specified. Boldface limits apply at the temperature extremes.
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LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com 5V Electrical Characteristics (1) (continued) Single ended in differential out, TA = 25°C, AV = +1, VS = 5V, VCM = 2.5V, RF = RG = 365Ω, RL = 500Ω; Unless specified. Boldface limits apply at the temperature extremes. Symbol Parameter Enable Pin Current Conditions Min (2) -250 VEN =4V (8) 55 Open Loop Gain DC, Differential PSRR Power Supply Rejection Ratio DC, ΔVS = ±0.
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LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 Typical Performance Characteristics (TA = 25°C, VS = ±5V, RL = 500Ω, RF = RG = 365Ω; Unless Specified). Frequency Response vs. Supply Voltage Frequency Response 1 1 0 0 VS = 5V -1 -2 VS = ±5V GAIN (dB) GAIN (dB) -2 -3 -4 -5 VS = ±5V -3 -4 -5 -6 -6 VOD = 0.5VPP -7 VOD = 1VPP -7 AV = 1 -8 AV = 1 -8 DIFFERENTIAL INPUT SINGLE ENDED INPUT -9 -9 1 10 100 1 1000 Figure 4. Frequency Response vs.
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LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) (TA = 25°C, VS = ±5V, RL = 500Ω, RF = RG = 365Ω; Unless Specified). 1 VPP Pulse Response Single Ended Input 70 0.8 60 0.6 50 0.4 VOUT (V) SUGGESTED RO (:) Suggested ROUT vs. Cap Load 40 30 20 0 -0.2 -0.4 LOAD = 1 k: || CAP LOAD 10 VS = 5V RL = 500: -0.6 VS = 5V 0 0.2 RF = 360: -0.8 1 10 100 0 10 20 30 40 50 60 70 80 90 100 TIME (ns) CAPACITIVE LOAD (pF) Figure 9.
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LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 Typical Performance Characteristics (continued) (TA = 25°C, VS = ±5V, RL = 500Ω, RF = RG = 365Ω; Unless Specified). Distortion vs. Frequency Single Ended Input Maximum VOUT vs. IOUT 4 -40 3.9 -50 3.8 MAXIMUM VOUT (V) DISTORTION (dBc) HD3 -60 -70 -80 HD2 VS = ±5V -90 RL = 800: 3.6 3.5 3.4 AV = 2 RF = 730: 3.1 VOCM = 0V -110 VIN = 3.
PAGE 10
LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) (TA = 25°C, VS = ±5V, RL = 500Ω, RF = RG = 365Ω; Unless Specified). PSRR CMRR 100 85 80 PSRR 75 70 CMRR (dB) PSRR (dBc DIFFERENTIAL) 90 80 PSRR + 60 50 40 60 VS = 5V 55 20 RL = 500: 50 AV = 1 45 VIN = 2.5V 0 0.01 0.1 1 10 100 40 0.1 1000 1 10 100 1000 FREQUENCY (MHz) FREQUENCY (MHz) Figure 21. Figure 22. Balance Error 3rd Order Intermodulation Products vs.
PAGE 11
LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 APPLICATION SECTION The LMH6550 is a fully differential amplifier designed to provide low distortion amplification to wide bandwidth differential signals. The LMH6550, though fully integrated for ultimate balance and distortion performance, functionally provides three channels. Two of these channels are the V+ and V− signal path channels, which function similarly to inverting mode operational amplifiers and are the primary signal paths.
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LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com 500 50: 100: TWISTED PAIR 250 + 2 VPP a VCM 250 2 VPP 50: 500 GAIN = 2 ENABLE Figure 26. Fully Differential Cable Driver With up to 15 VPP differential output voltage swing and 80 mA of linear drive current the LMH6550 makes an excellent cable driver as shown in Figure 26. The LMH6550 is also suitable for driving differential cables from a single ended source.
PAGE 13
LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 SINGLE ENDED INPUT TO DIFFERENTIAL OUTPUT The LMH6550 provides excellent performance as an active balun transformer. Figure 29 shows a typical application where an LMH6550 is used to produce a differential signal from a single ended source. In single ended input operation the output common mode voltage is set by the VCM pin as in fully differential mode.
PAGE 14
LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com RF RO VO1 VI1 RG RS + VI a RT RL CL VCM VO RG VI2 RM VO2 RO RF ENABLE *VCM = VO1 + VO2 VICM = VOCM 2 *BY DESIGN VICM = VI1 + VI2 2 Figure 30. AC Coupled for Single Supply Operation DRIVING ANALOG TO DIGITAL CONVERTERS Analog to digital converters (ADC) present challenging load conditions. They typically have high impedance inputs with large and often variable capacitive components.
PAGE 15
LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 The amplifier and ADC should be located as closely together as possible. Both devices require that the filter components be in close proximity to them. The amplifier needs to have minimal parasitic loading on the output traces and the ADC is sensitive to high frequency noise that may couple in on its input lines. Some high performance ADCs have an input stage that has a bandwidth of several times its sample rate.
PAGE 16
LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com 100: TWISTED PAIR 375 200: 2:1 (TURNS) 375 4 VPP a + VCM VCM 375 1 VPP RL = 100: 200: 375 ENABLE AV = 1 Figure 34. Transformer Out Low Impedance Load 50: COAX 375 100: 2:1 (TURNS) 375 4 VPP a + VCM C1 375 1 VPP 100: 375 ENABLE GAIN = 1 C1 IS NOT REQUIRED IF VCM = GROUND Figure 35.
PAGE 17
LMH6550 www.ti.com SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 1. Calculate the quiescent (no-load) power: PAMP = ICC* (VS), where VS = V+ - V−. (Be sure to include any current through the feedback network if VOCM is not mid rail.) 2.
PAGE 18
LMH6550 SNOSAK0H – DECEMBER 2004 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision G (March 2013) to Revision H • 18 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
PAGE 21
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LMH6550MAX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMH6550MM/NOPB VSSOP DGK 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LMH6550MMX/NOPB VSSOP DGK 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.
PAGE 22
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH6550MAX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LMH6550MM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LMH6550MMX/NOPB VSSOP DGK 8 3500 367.0 367.0 35.
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