Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Current feedback WSON 8 (3x2.5)

255:

LMH6553

255:

275:

ADC

IN-

IN+

8 to14 Bit

CLAMP

59:

50:

Single-Ended

AC-Coupled

Source

59:

49.9:

0.1PF

LMH6553

www.ti.com

SNOSB07H –SEPTEMBER 2008–REVISED MARCH 2013

LMH6553 900 MHz Fully Differential Amplifier With Output Limiting Clamp

Check for Samples: LMH6553

FEATURES

DESCRIPTION

The LMH6553 is a 900 MHz differential amplifier with

• 900 MHz −3 dB Small Signal

an integrated adjustable output limiting clamp. The

Bandwidth @ A

= 1

clamp increases system performance and provides

• 670 MHz −3 dB Large Signal

transient over-voltage protection to following stages.

Bandwidth @ A

= 1

The internal clamp feature of the LMH6553 reduces

or eliminates the need for external discrete overload

• −79 dB THD @ 20 MHz

protection networks. When used to drive ADCs, the

• −92 dB IMD3 @ f

= 20 MHz

amplifier's output clamp allows low voltage ADC

• 10 ns Settling Time to 0.1%

inputs to be protected from being overdriven and

• 600 ps Clamp Overdrive Recovery Time

damaged by large input signals appearing at the

system input. Fast overdrive recovery of 600 ps

• 40 mV Clamp Accuracy with 100% Overdrive

ensures the amplifier output rapidly recovers from a

• −0.1 mV/°C Clamp Temperature Drift

clamping event and quickly resumes to follow the

• 4.5 to 12 Supply Voltage Operation

input signal. The LMH6553 delivers exceptional

bandwidth, distortion, and noise performance ideal for

driving ADCs up to 14-bits. The LMH6553 could also

APPLICATIONS

be used for automotive, communication, medical, test

• Differential ADC Driver

and measurement, video, and LIDAR applications.

• Video Over Twisted Pair

With external gain set resistors and integrated

• Differential Line Driver

common mode feedback, the LMH6553 can be

• Single End to Differential Converter

configured as either a differential input to differential

output or single ended input to differential output gain

• High Speed Differential Signaling

block. The LMH6553 can be AC or DC coupled at the

• IF/RF Amplifier

input which makes it suitable for a wide range of

• SAW Filter Buffer/Driver

applications including communication systems and

high speed oscilloscope front ends. The LMH6553 is

• CCD Output Limiting Amplifier

available in 8-pin SO PowerPAD and 8-pin WSON

• Automotive Safety Applications

packages, and is part of our LMH™ high speed

amplifier family.

Typical Application

Figure 1. Single-Ended Input Differential Output 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 (39 pages)

PAGE 1
LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 LMH6553 900 MHz Fully Differential Amplifier With Output Limiting Clamp Check for Samples: LMH6553 FEATURES DESCRIPTION 1 • 23 • • • • • • • • The LMH6553 is a 900 MHz differential amplifier with an integrated adjustable output limiting clamp. The clamp increases system performance and provides transient over-voltage protection to following stages.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com 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. Absolute Maximum Ratings ESD Tolerance (1) (2) (3) Human Body Model 4000V Machine Model 350V Supply Voltage 13.
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LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 VS = ±5V Electrical Characteristics (1) Unless otherwise specified, all limits are ensured for TA = 25°C, VS = ±5V, AV = 1, VCM = 0V, VCLAMP = 3V, RF = RG = 275Ω, RL = 200Ω, for single-ended in, differential out. Boldface limits apply at the temperature extremes.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com VS = ±5V Electrical Characteristics (1) (continued) Unless otherwise specified, all limits are ensured for TA = 25°C, VS = ±5V, AV = 1, VCM = 0V, VCLAMP = 3V, RF = RG = 275Ω, RL = 200Ω, for single-ended in, differential out. Boldface limits apply at the temperature extremes.
PAGE 5
LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 VS = ±5V Electrical Characteristics (1) (continued) Unless otherwise specified, all limits are ensured for TA = 25°C, VS = ±5V, AV = 1, VCM = 0V, VCLAMP = 3V, RF = RG = 275Ω, RL = 200Ω, for single-ended in, differential out. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Input Bias Current VCM(TYPICAL) = 0, (11) VCM(MIN) = −3.2 V, (11) VCM(MAX) = +3.2V, (11) Voltage Range Min (2) (3) −8 −3.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com VS = ±2.5V Electrical Characteristics (1) (continued) Unless otherwise specified, all limits are ensured for TA = 25°C, VS = ±2.5V, AV = 1, VCM = 0V, VCLAMP = 2V, RF = RG = 275Ω, RL = 200Ω, for single-ended in, differential out. Boldface limits apply at the temperature extremes.
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LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 VS = ±2.5V Electrical Characteristics (1) (continued) Unless otherwise specified, all limits are ensured for TA = 25°C, VS = ±2.5V, AV = 1, VCM = 0V, VCLAMP = 2V, RF = RG = 275Ω, RL = 200Ω, for single-ended in, differential out. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (2) Typ (3) Max (2) Units Clamp Overshoot VIN = 1V Step, AV = 2 V/V, VCLAMP = 0.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com CONNECTION DIAGRAM -IN VCM V+ +OUT 1 8 2 - + 7 +IN VCLAMP 6 3 V- 5 4 -OUT DAP Figure 2. 8-Pin SO PowerPAD Top View -IN 1 8 +IN VCM 2 7 VCLAMP V+ 3 6 V- +OUT 4 5 -OUT DAP Figure 3.
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LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 PIN DESCRIPTIONS Pin No.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VS = ±5V (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). Frequency Response vs. Gain 1 AV = 1 0 -3 AV = 8 -4 -1 NORMALIZED GAIN (dB) AV = 4 -2 -5 -6 -7 -3 -5 -6 -7 NORMALIZED GAIN (dB) 1000 -9 1 10000 10 100 FREQUENCY (MHz) Figure 5. Frequency Response vs. VOUT -9 VO = 0.5 VPP VOD = 0.
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LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 Typical Performance Characteristics VS = ±5V (continued) (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). Frequency Response vs. Capacitive Load Suggested RO vs. Capacitive Load -9 60 CL = 82 pF, RO =16Ö -7 50 SUGGESTED RO (Ö) NORMALIZED GAIN (dB) -8 CL = 39 pF, RO = 21Ö -6 -5 CL = 15 pF, RO = 30Ö -4 CL = 5.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VS = ±5V (continued) (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). 2 VPP Pulse Response Single-Ended Input 4 VPP Pulse Response Single-Ended Input -2.5 1.5 -2.0 1.0 -1.5 -1.0 0.0 VS = +5V -0.5 -0.5 VOD (V) 0.0 RL = 200Ö RF = 275Ö -1.0 VS = +5V 1.0 RL = 200Ö RF = 275Ö 1.5 VCLAMP = 3V VCLAMP = 3V 2.0 VCM = 0V -1.5 VCM = 0V 2.
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LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 Typical Performance Characteristics VS = ±5V (continued) (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). Output Common Mode Pulse Response -50 -45 -40 -50 -30 -55 DISTORTION (dBc) COMMON MODE VOUT (mV) Distortion vs.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VS = ±5V (continued) (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). Distortion vs. Frequency Single-Ended Input (RL=200Ω) Distortion vs.
PAGE 15
LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 Typical Performance Characteristics VS = ±5V (continued) (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). Distortion vs. VCM (fc=75Mhz, RL=200Ω) Maximum VOUT vs. IOUT 4.5 VS = ±5V R = 200Ö -20.0 L VOD = 2 VPP V = 3V -30.0 CLAMP fc = 75MHz HD2 4 MAXIMUM VOUT (V) DISTORTION (dBc) -10.0 -40.0 -50.0 HD3 -60.0 -70.0 3.5 3 VS = +5V RF = 275Ö VCM = 3V 2.5 VCLAMP = 5V -80.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VS = ±5V (continued) (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). Open Loop Transimpedance PSRR 120 100 90 100 90 0 80 PHASE 70 -45 -90 60 PSRR (dBc DIFFERENTIAL) MAGNITUDE PHASE (°) MAGNITUDE, |Z| (dB Ö) 110 -135 50 VS = +2.5V 40 0.01 0.
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LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 Typical Performance Characteristics VS = ±5V (continued) (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). Noise Figure Differential S-Parameter Magnitude vs.
PAGE 18
LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics VS = ±5V (continued) (TA = 25°C, RF = RG = 275Ω, RL = 200Ω, AV = 1, for single ended in, differential out, unless specified). 3rd Order Intermodulation Products vs. Center Frequency 3rd Order Intermodulation Products vs. Center Frequency -30 VS = ±5V -55 RF = 324Ö RL = 800Ö -60 AV = 2 V/V V = 2 VPP -65 OD VCLAMP = 3V -70 VS = ±2.
PAGE 19
LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 APPLICATION INFORMATION The LMH6553, a fully differential current feedback amplifier with integrated output common mode control and output limiting clamp, is designed to provide protection of following input stages.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com When driven from a differential source, the LMH6553 provides low distortion, excellent balance, and common mode rejection. This is true provided the resistors RF, RG and RO are well matched and strict symmetry is observed in board layout. 275: 50: 61: RS = 50: VIN 275: + VCM a RL RS = 50: 61: 275: VCLAMP 50: 275: Figure 55.
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LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 To match the input impedance of the circuit in Figure 56 to a specified source resistance, RS, requires that RT || RIN = RS. The equations governing RIN and AV for single-to-differential operation are also provided in Figure 56. These equations, along with the source matching condition, must be solved iteratively to achieve the desired gain with the proper input termination.
PAGE 22
LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com RF RG RS RO VO1 VI1 - + VIN a RT CL VCM RL + RG RM VOUT VI2 VO2 RF RO VCLAMP *VCM = VO1 + VO2 2 *BY DESIGN VICM = VOCM VICM = VI1 + VI2 2 Figure 58. AC Coupled for Single Supply Operation SPLIT SUPPLY OPERATION For optimum performance, split supply operation is recommended using +5V and −5V supplies; however, operation is possible on split supplies as low as +2.25V and −2.25V and as high as +6V and −6V.
PAGE 23
LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 V VON_SE 2.5 VCLAMP 2.0 VCM = 1.5 1 VPP 2*VCM ± VCLAMP 1.0 0.5 SE Unclampled output 0 RF t RG VIN = 2VPP 0V + VCM = 1.5V VCM VCLAMP Differential Output VON-VOP = 2VPP RG RF V Vclamp = 2.0V VOP_SE 2.5 VCLAMP 1 VPP 2.0 VCM = 1.5 1.0 2*VCM ± VCLAMP 0.5 SE Unclampled output 0 t Figure 59. Clamp Operation CLAMP PERFORMANCE Key clamp performance specifications are listed in the electrical characteristics section.
PAGE 24
LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com VOUT(MAX) +V VCLAMP 5 SE Unclamped output 4 VOUT(MAX) = + 3.7V VCM = 3 2 1 2*VCM ± VCLAMP 0 t VOUT(MIN) t 0 -1 VCLAMP -2 VCM = -3 VOUT(MIN) = -3.7V -4 SE Unclamped output 2*VCM ± VCLAMP -5 -V Figure 61.
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LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 DRIVING ANALOG TO DIGITAL CONVERTERS Analog-to-digital converters present challenging load conditions. They typically have high impedance inputs with large and often variable capacitive components. As well, there are usually current spikes associated with switched capacitor or sample and hold circuits. Figure 63 shows the LMH6553 driving the ADC14C105. The amplifier is configured to provide a gain of 2 V/V in a single-to-differential mode.
PAGE 26
LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com The LMH6553 is capable of driving a variety of Texas Instruments Analog-to-Digital Converters. This is shown in Table 3, which offers a list of possible signal path ADC and amplifier combinations. The use of the LMH6553 to drive an ADC is determined by the application and the desired sampling process (Nyquist operation, subsampling or over-sampling).
PAGE 27
LMH6553 www.ti.com SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 Table 3. DIFFERENTIAL INPUT ADCs COMPATIBLE WITH LMH6553 DRIVER (continued) Product Number Max Sampling Rate (MSPS) Resolution Channels ADC14DS105 105 14 DUAL ADC14155 155 14 SINGLE DRIVING CAPACITIVE LOADS As noted previously, capacitive loads should be isolated from the amplifier outputs with small valued resistors. This is particularly the case when the load has a resistive component that is 500Ω or higher.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com + V 10 PF 0.1 PF + VCM 0.01 PF - VCLAMP 0.1 PF 0.1 PF 10 PF - V 0.1 PF Figure 66. Split Supply Bypassing Capacitors V+ 0.1 PF 10 PF 0.01 PF + VCM 0.1 PF VCLAMP 0.01 PF Figure 67. Single Supply Bypassing Capacitors POWER DISSIPATION The LMH6553 is optimized for maximum speed and performance in the small form factor of the standard WSON package.
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LMH6553 www.ti.
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LMH6553 SNOSB07H – SEPTEMBER 2008 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision G (March 2013) to Revision H • 30 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 11-Apr-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-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 LMH6553MRE/NOPB SO Power PAD DDA 8 250 178.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMH6553MRX/NOPB SO Power PAD DDA 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LMH6553SD/NOPB WSON NGS 8 1000 178.0 12.4 3.3 2.8 1.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH6553MRE/NOPB SO PowerPAD DDA LMH6553MRX/NOPB SO PowerPAD DDA 8 250 213.0 191.0 55.0 8 2500 367.0 367.0 35.0 LMH6553SD/NOPB WSON NGS 8 1000 210.0 185.0 35.0 LMH6553SDE/NOPB WSON NGS 8 250 210.0 185.0 35.0 LMH6553SDX/NOPB WSON NGS 8 4500 367.0 367.0 35.
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MECHANICAL DATA DDA0008A MRA08A (Rev D) www.ti.
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MECHANICAL DATA NGS0008C SDA08C (Rev A) www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.