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LMH6643QMM/NOPB

LMH6643QMM/NOPB

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    VSSOP8

  • 描述:

    LMH6643Q-Q1 130MHZ 75MA RAIL TO

  • 数据手册
  • 价格&库存
LMH6643QMM/NOPB 数据手册
Sample & Buy Product Folder Support & Community Tools & Software Technical Documents LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 LMH6642Q/LMH6643Q Low Power, 130 MHz, 75 mA Rail-to-Rail Output Amplifiers 1 Features 2 Applications • • • • • • • 1 • • • • • • • • • • • • • • • • • (1) (VS = ±5 V, TA = 25°C, RL = 2 kΩ, AV = +1. Typical Values Unless Specified). −3dB BW (AV = +1) 130 MHz Supply Voltage Range 2.7 V to 10 V Slew Rate, (AV = −1) 130V/µs(1) Supply Current (no load) 2.7 mA/amp Output Short Circuit Current +115 mA/−145 mA Linear Output Current ±75mA Input Common Mode Voltage 0.5V Beyond V−, 1V from V+ Output Voltage Swing 40mV from Rails Input Voltage Noise (100kHz) 17nV/√Hz Input Current Noise (100kHz) 0.9pA/√Hz THD (5MHz, RL = 2 kΩ, VO = 2VPP, AV = +2) −62 dBc Settling Time 68ns Fully Characterized for 3 V, 5 V, and ±5 V Overdrive Recovery 100ns Output Short Circuit Protected(2) No Output Phase Reversal with CMVR Exceeded LMH6643QMM and LMH6642QMF are AEC-Q100 Grade 3 Qualified and are Manufactured on an Automotive Grade Flow Active Filters CD/DVD ROM ADC Buffer Amp Portable Video Current Sense Buffer Automotive 3 Description The LMH664X family true single supply voltage feedback amplifiers offer high speed (130 MHz), low distortion (−62 dBc), and exceptionally high output current (approximately 75 mA) at low cost and with reduced power consumption when compared against existing devices with similar performance. Input common mode voltage range extends to 0.5 V below V− and 1 V from V+. Output voltage range extends to within 40mV of either supply rail, allowing wide dynamic range especially desirable in low voltage applications. The output stage is capable of approximately 75 mA in order to drive heavy loads. Fast output Slew Rate (130 V/µs) ensures large peak-to-peak output swings can be maintained even at higher speeds, resulting in exceptional full power bandwidth of 40 MHz with a 3-V supply. These characteristics, along with low cost, are ideal features for a multitude of industrial and commercial applications. Slew rate is the average of the rising and falling slew rates Device Information(1) (2) Output short circuit duration is infinite for VS < 6 V at room temperature and below. For VS > 6 V, allowable short circuit duration is 1.5 ms. Closed Loop Gain vs. Frequency for Various Gain +3 +1 LMH6643-Q1 VSSOP (8) 3.00 mm × 3.00 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. Large Signal Frequency Response 8.0 VS = ±1.5V AV = +1 ±2.5V 6.0 RL = 2k 2.0 -1 0.0 AV = +10 2VPP ±5V 4.0 VOUT = 0.2VPP -3 BODY SIZE (NOM) 2.90 mm × 1.60 mm 0 -2 PACKAGE SOT-23 (5) GAIN (dB) NORMALIZED GAIN (dB) +2 PART NUMBER LMH6642-Q1 4VPP AV = +5 AV = +2 RF = RL = 2k AV = +2 10k 100k 1M 10M FREQUENCY (Hz) 100M 500M 100k 1M 10M 200M FREQUENCY (Hz) 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Description (continued)......................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 3 4 Absolute Maximum Ratings (1) ................................... Handling Ratings....................................................... Recommended Operating Conditions....................... Thermal Information .................................................. 3V Electrical Characteristics ..................................... 5V Electrical Characteristics ..................................... ±5V Electrical Characteristics ................................... 4 4 4 4 5 7 9 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 Typical Performance Characteristics ...................... 11 8 Application and Implementation ........................ 20 8.1 Circuit Description ................................................... 20 8.2 Single Supply, Low Power Photodiode Amplifier.... 23 8.3 Printed Circuit Board Layout and Component Values Section ..................................................................... 24 9 Device and Documentation Support.................. 25 9.1 9.2 9.3 9.4 9.5 Documentation Support .......................................... Related Links .......................................................... Trademarks ............................................................. Electrostatic Discharge Caution .............................. Glossary .................................................................. 25 25 25 25 25 10 Mechanical, Packaging, and Orderable Information ........................................................... 25 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (March 2013) to Revision C Page • Changed data sheet structure and organization. Added, updated, or renamed the following sections: Device Information Table, Pin Configuration and Functions, Application and Implementation; Device and Documentation Support; Mechanical, Packaging, and Ordering Information.................................................................................................. 1 • Changed "Junction Temperature Range" to "Operating Temperature Range" in Recommended Operating Conditions...... 4 • Deleted TJ = 25°C in Electrical Characteristics tables............................................................................................................ 5 • Deleted TJ = 25°C in Typical Performance Characteristics section. .................................................................................... 11 Changes from Revision A (March 2013) to Revision B • 2 Page Changed layout of National Data Sheet to TI format ........................................................................................................... 24 Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 5 Description (continued) Careful attention has been paid to ensure device stability under all operating voltages and modes. The result is a very well behaved frequency response characteristic (0.1dB gain flatness up the 12MHz under 150Ω load and AV = +2) with minimal peaking (typically 2dB maximum) for any gain setting and under both heavy and light loads. This along with fast settling time (68ns) and low distortion allows the device to operate well in ADC buffer, and high frequency filter applications as well as other applications. This device family offers professional quality video performance with low DG (0.01%) and DP (0.01°) characteristics. Differential Gain and Differential Phase characteristics are also well maintained under heavy loads (150Ω) and throughout the output voltage range. The LMH664X family is offered in single (LMH6642) and dual (LMH6643). 6 Pin Configuration and Functions 5-Pin SOT-23 Package Package DBV0005A Top View 8-Pin VSSOP Package Package DGK0008A Top View 5 1 V OUTPUT 1 + 8 + V OUT A A 2 V - - + 7 -IN A 2 OUT B - + 3 6 +IN A +IN 4 3 -IN + V - -IN B B 4 5 +IN B Pin Functions PIN NAME NUMBER LMH6642Q I/O DESCRIPTION LMH6643Q -IN 4 I Inverting Input +IN 3 I Non-inverting Input -IN A 2 I ChA Inverting Input +IN A 3 I ChA Non-inverting Input -IN B 6 I ChB Inverting Input +IN B 5 I ChB Non-inverting Input OUT A 1 O ChA Output OUT B 7 O ChB Output OUTPUT 1 O Output V- 2 4 I Negative Supply V+ 5 8 I Positive Supply Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 3 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com 7 Specifications 7.1 Absolute Maximum Ratings (1) (2) (1) over operating free-air temperature range (unless otherwise noted) MIN MAX VIN Differential ±2.5 Output Short Circuit Duration (3) See Supply Voltage (V+ - V−) Voltage at Input/Output pins Input Current UNIT V and (4) 13.5 V V+ +0.8 V− −0.8 V ±10 mA +150 °C Infrared or Convection Reflow (20 sec) 235 °C Wave Soldering Lead Temp.(10 sec) 260 °C Junction Temperature (5) Soldering Information (1) (2) (3) (4) (5) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not ensured. For ensured specifications and the test conditions, see the Electrical Characteristics. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150°C. Output short circuit duration is infinite for VS < 6 V at room temperature and below. For VS > 6 V, allowable short circuit duration is 1.5ms. The maximum power dissipation is a function of TJ(MAX),R θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - TA)/R θJA. All numbers apply for packages soldered directly onto a PC board. 7.2 Handling Ratings Tstg Storage temperature range MIN MAX UNIT −65 +150 °C Human body model (HBM), per AEC Q100-002 (1) V(ESD) (1) (2) Electrostatic discharge 2000 Machine Model (MM) (2) 200 Charged Device Model (CDM), per AEC Q100-011 1000 V AEC Q100-002 indicates HBM stressing is done in accordance with the ANSI/ESDA/JEDEC JS-001 specification,1.5kΩ in series with 100pF. Machine Model, 0Ω in series with 200pF. 7.3 Recommended Operating Conditions (1) over operating free-air temperature range (unless otherwise noted) MIN + − MAX UNIT Supply Voltage (V – V ) 2.7 10 V Operating Temperature Range (2) −40 +85 °C (1) (2) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not ensured. For ensured specifications and the test conditions, see the Electrical Characteristics. The maximum power dissipation is a function of TJ(MAX),RθJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - TA)/RθJA. All numbers apply for packages soldered directly onto a PC board. 7.4 Thermal Information THERMAL METRIC (1) RθJA (1) (2) 4 Junction-to-ambient thermal resistance (2) DBV05A DGK08A 5 PINS 8 PINS 265°C/W 235°C/W UNIT °C/W For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. The maximum power dissipation is a function of TJ(MAX),RθJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - TA)/RθJA. All numbers apply for packages soldered directly onto a PC board. Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 7.5 3V Electrical Characteristics Unless otherwise specified, all limits ensured for V+ = 3V, V− = 0V, VCM = VO = V+/2, VID (input differential voltage) as noted (where applicable) and RL = 2kΩ to V+/2. Boldface limits apply at the temperature extremes. PARAMETER TEST CONDITIONS −3dB BW BW MIN (1) TYP (2) 80 115 AV = +1, VOUT = 200mVPP AV = +2, −1, VOUT = 200mVPP 46 BW0.1dB 0.1dB Gain Flatness AV = +2, RL = 150Ω to V+/2, RL = 402Ω, VOUT = 200mVPP 19 PBW Full Power Bandwidth AV = +1, −1dB, VOUT = 1VPP 40 en Input-Referred Voltage Noise f = 100kHz 17 f = 1kHz 48 in Input-Referred Current Noise f = 100kHz Total Harmonic Distortion f = 5MHz, VO = 2VPP, AV = −1, RL = 100Ω to V+/2 DG Differential Gain VCM = 1V, NTSC, AV = +2 RL =150Ω to V+/2 pA/√Hz dBc 0.03% VCM = 1V, NTSC, AV = +2 RL =150Ω to V+/2 0.05 RL =1kΩ to V+/2 0.03 CT Rej. Cross-Talk Rejection f = 5MHz, Receiver: Rf = Rg = 510Ω, AV = +2 47 TS Settling Time VO = 2VPP, ±0.1%, 8pF Load, VS = 5V 68 SR Slew Rate (3) AV = −1, VI = 2VPP VOS Input Offset Voltage For LMH6642 90 For LMH6643 deg dB ns 120 V/µs ±1 ±5 ±7 ±1 ±3.4 ±7 TC VOS Input Offset Average Drift (4) IB Input Bias Current (5) IOS Input Offset Current RIN Common Mode Input Resistance 3 CIN Common Mode Input Capacitance 2 CMVR Input Common-Mode Voltage Range ±5 CMRR ≥ 50dB µV/°C −1.50 µA 20 800 1000 nA −0.5 1.8 1.6 2.0 Common Mode Rejection Ratio VCM Stepped from 0V to 1.5V 72 95 AVOL Large Signal Voltage Gain VO = 0.5V to 2.5V RL = 2kΩ to V+/2 80 75 96 VO = 0.5V to 2.5V RL = 150Ω to V+/2 74 70 82 MΩ pF −0.2 −0.1 V dB dB Output Swing High RL = 2kΩ to V+/2, VID = 200mV 2.90 2.98 + 2.80 2.93 Output Swing Low RL = 2kΩ to V+/2, VID = −200mV 25 75 RL = 150Ω to V+/2, VID = −200mV 75 150 RL = 150Ω to V /2, VID = 200mV mV −2.60 −3.25 CMRR (1) (2) (3) (4) (5) nV/√Hz 0.17% RL =1kΩ to V /2 VO MHz −48 + Differential Phase MHz 3.3 THD UNIT MHz 0.90 f = 1kHz DP MAX (1) V mV All limits are ensured by testing or statistical analysis. Typical values represent the most likely parametric norm. Slew rate is the average of the rising and falling slew rates. Offset voltage average drift determined by dividing the change in VOS at temperature extremes by the total temperature change. Positive current corresponds to current flowing into the device. Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 5 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com 3V Electrical Characteristics (continued) Unless otherwise specified, all limits ensured for V+ = 3V, V− = 0V, VCM = VO = V+/2, VID (input differential voltage) as noted (where applicable) and RL = 2kΩ to V+/2. Boldface limits apply at the temperature extremes. MIN (1) TYP (2) Sourcing to V+/2 VID = 200mV (6) 50 35 95 Sinking to V+/2 VID = −200mV (6) 55 40 110 PARAMETER ISC TEST CONDITIONS Output Short Circuit Current IOUT Output Current VOUT = 0.5V from either supply Positive Power Supply Rejection Ratio V = 3.0V to 3.5V, VCM = 1.5V IS Supply Current (per channel) No Load 6 ±65 75 UNIT mA mA + +PSRR (6) MAX (1) dB 85 2.70 4.00 4.50 mA Short circuit test is a momentary test. Output short circuit duration is infinite for VS < 6V at room temperature and below. For VS > 6V, allowable short circuit duration is 1.5ms. Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 7.6 5V Electrical Characteristics Unless otherwise specified, all limits ensured for V+ = 5V, V− = 0V, VCM = VO = V+/2, VID (input differential voltage) as noted (where applicable) and RL = 2kΩ to V+/2. Boldface limits apply at the temperature extremes. PARAMETER TEST CONDITIONS −3dB BW BW MIN (1) TYP (2) 90 120 AV = +1, VOUT = 200mVPP AV = +2, −1, VOUT = 200mVPP 46 BW0.1dB 0.1dB Gain Flatness AV = +2, RL = 150Ω to V+/2, Rf = 402Ω, VOUT = 200mVPP 15 PBW Full Power Bandwidth AV = +1, −1dB, VOUT = 2VPP 22 en Input-Referred Voltage Noise f = 100kHz 17 f = 1kHz 48 in Input-Referred Current Noise f = 100kHz MHz MHz nV/√Hz pA/√Hz 3.3 −60 THD Total Harmonic Distortion f = 5MHz, VO = 2VPP, AV = +2 DG Differential Gain NTSC, AV = +2 RL =150Ω to V+/2 0.16% RL = 1kΩ to V+/2 0.05% Differential Phase UNIT MHz 0.90 f = 1kHz DP MAX (1) NTSC, AV = +2 RL = 150Ω to V+/2 0.05 RL = 1kΩ to V+/2 0.01 dBc deg CT Rej. Cross-Talk Rejection f = 5MHz, Receiver: Rf = Rg = 510Ω, AV = +2 47 dB TS Settling Time VO = 2VPP, ±0.1%, 8pF Load 68 ns (3) SR Slew Rate VOS Input Offset Voltage AV = −1, VI = 2VPP 95 For LMH6642 For LMH6643 125 ±1 ±1 ±3.4 ±7 TC VOS Input Offset Average Drift (4) IB Input Bias Current (5) IOS Input Offset Current RIN Common Mode Input Resistance 3 CIN Common Mode Input Capacitance 2 CMVR Input Common-Mode Voltage Range ±5 CMRR ≥ 50dB µA 20 800 1000 nA −0.5 3.8 3.6 4.0 Common Mode Rejection Ratio VCM Stepped from 0V to 3.5V 72 95 Large Signal Voltage Gain VO = 0.5V to 4.50V RL = 2kΩ to V+/2 86 82 98 VO = 0.5V to 4.25V RL = 150Ω to V+/2 76 72 82 (1) (2) (3) (4) (5) µV/°C −1.70 AVOL MΩ pF −0.2 −0.1 V dB dB Output Swing High RL = 2kΩ to V+/2, VID = 200mV 4.90 4.98 RL = 150Ω to V+/2, VID = 200mV 4.65 4.90 Output Swing Low RL = 2kΩ to V+/2, VID = −200mV RL = 150Ω to V+/2, VID = −200mV mV −2.60 −3.25 CMRR VO V/µs ±5 ±7 V 25 100 100 150 mV All limits are ensured by testing or statistical analysis. Typical values represent the most likely parametric norm. Slew rate is the average of the rising and falling slew rates. Offset voltage average drift determined by dividing the change in VOS at temperature extremes by the total temperature change. Positive current corresponds to current flowing into the device. Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 7 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com 5V Electrical Characteristics (continued) Unless otherwise specified, all limits ensured for V+ = 5V, V− = 0V, VCM = VO = V+/2, VID (input differential voltage) as noted (where applicable) and RL = 2kΩ to V+/2. Boldface limits apply at the temperature extremes. MIN (1) TYP (2) Sourcing to V+/2 VID = 200mV (6) 55 40 115 Sinking to V+/2 VID = −200mV (6) 70 55 140 PARAMETER ISC TEST CONDITIONS Output Short Circuit Current IOUT Output Current VO = 0.5V from either supply Positive Power Supply Rejection Ratio V = 4.0V to 6V IS Supply Current (per channel) No Load 8 ±70 79 UNIT mA mA + +PSRR (6) MAX (1) dB 90 2.70 4.25 5.00 mA Short circuit test is a momentary test. Output short circuit duration is infinite for VS < 6V at room temperature and below. For VS > 6V, allowable short circuit duration is 1.5ms. Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 7.7 ±5V Electrical Characteristics Unless otherwise specified, all limits ensured for V+ = 5V, V− = −5V, VCM = VO = 0V, VID (input differential voltage) as noted (where applicable) and RL = 2kΩ to ground. Boldface limits apply at the temperature extremes. PARAMETER TEST CONDITIONS −3dB BW BW MIN (1) TYP (2) 95 130 AV = +1, VOUT = 200mVPP AV = +2, −1, VOUT = 200mVPP 46 BW0.1dB 0.1dB Gain Flatness AV = +2, RL = 150Ω to V+/2, Rf = 806Ω, VOUT = 200mVPP 12 PBW Full Power Bandwidth AV = +1, −1dB, VOUT = 2VPP 24 en Input-Referred Voltage Noise f = 100kHz 17 f = 1kHz 48 in Input-Referred Current Noise f = 100kHz f = 5MHz, VO = 2VPP, AV = +2 Differential Gain NTSC, AV = +2 RL = 150Ω to V+/2 0.15% RL = 1kΩ to V+/2 0.01% NTSC, AV = +2 RL = 150Ω to V+/2 0.04 RL = 1kΩ to V+/2 0.01 CT Rej. Cross-Talk Rejection f = 5MHz, Receiver: Rf = Rg = 510Ω, AV = +2 47 TS Settling Time VO = 2VPP, ±0.1%, 8pF Load, VS = 5V 68 SR Slew Rate VOS Input Offset Voltage AV = −1, VI = 2VPP 100 For LMH6642 For LMH6643 dBc deg dB ns V/µs ±1 ±1 ±3.4 ±7 IB Input Bias Current (5) IOS Input Offset Current RIN Common Mode Input Resistance 3 CIN Common Mode Input Capacitance 2 CMVR Input Common-Mode Voltage Range ±5 CMRR ≥ 50dB mV µV/°C −1.60 −2.60 −3.25 µA 20 800 1000 nA −5.5 3.8 3.6 4.0 CMRR Common Mode Rejection Ratio VCM Stepped from −5V to 3.5V 74 95 AVOL Large Signal Voltage Gain VO = −4.5V to 4.5V, RL = 2kΩ 88 84 96 VO = −4.0V to 4.0V, RL = 150Ω 78 74 82 (1) (2) (3) (4) (5) pA/√Hz ±5 ±7 (4) VO nV/√Hz 135 Input Offset Average Drift TC VOS MHz −62 Total Harmonic Distortion DG (3) MHz 3.3 THD Differential Phase UNIT MHz 0.90 f = 1kHz DP MAX (1) MΩ pF −5.2 −5.1 V dB dB Output Swing High RL = 2kΩ, VID = 200mV 4.90 4.96 RL = 150Ω, VID = 200mV 4.65 4.80 Output Swing Low RL = 2kΩ, VID = −200mV −4.96 −4.90 RL = 150Ω, VID = −200mV −4.80 −4.65 V V All limits are ensured by testing or statistical analysis. Typical values represent the most likely parametric norm. Slew rate is the average of the rising and falling slew rates. Offset voltage average drift determined by dividing the change in VOS at temperature extremes by the total temperature change. Positive current corresponds to current flowing into the device. Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 9 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com ±5V Electrical Characteristics (continued) Unless otherwise specified, all limits ensured for V+ = 5V, V− = −5V, VCM = VO = 0V, VID (input differential voltage) as noted (where applicable) and RL = 2kΩ to ground. Boldface limits apply at the temperature extremes. MIN (1) TYP (2) Sourcing to Ground VID = 200mV (6) 60 35 115 Sinking to Ground VID = −200mV (6) 85 65 145 PARAMETER ISC Output Short Circuit Current IOUT Output Current TEST CONDITIONS VO = 0.5V from either supply + Power Supply Rejection Ratio (V , V ) = (4.5V, −4.5V) to (5.5V, −5.5V) IS Supply Current (per channel) No Load 10 ±75 78 UNIT mA mA − PSRR (6) MAX (1) dB 90 2.70 4.50 5.50 mA Short circuit test is a momentary test. Output short circuit duration is infinite for VS < 6V at room temperature and below. For VS > 6V, allowable short circuit duration is 1.5ms. Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 7.8 Typical Performance Characteristics V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. +3 VS = ±1.5V +2 VS = ±2.5V -1 GAIN (dB) NORMALIZED GAIN (dB) 0 VS = ±5V -2 -3 VS = ±1.5V VS = ±2.5V VS = ±5V AV = +1 RL = 2k +1 VS = ±5V RL = 2k VOUT = 0.2VPP 0 -1 AV = +10 -2 -3 AV = +5 AV = +2 AV = +1 VOUT = 0.2VPP 100k 1M 10M 200M 10k 100k 1M FREQUENCY (Hz) Figure 1. Closed Loop Frequency Response for Various Supplies +3 AV = +1 0 -40°C -2 VOUT = 0.2VPP 25°C -4 0 GAIN (dB) NORMALIZED GAIN (dB) 500 M Figure 2. Closed Loop Gain vs. Frequency for Various Gain RL = 2k +1 100M 85°C VS = ±1.5V +2 10M FREQUENCY (Hz) -1 -2 AV = +10 -3 -6 VS = ±1.5V AV = +5 RL = 2k AV = +1 VO = 0.2VPP AV = +2 10k 10k 100k 1M 10M 100k 100M 500M 1M 10M 100M 500M FREQUENCY (Hz) FREQUENCY (Hz) Figure 3. Closed Loop Gain vs. Frequency for Various Gain Figure 4. Closed Loop Frequency Response for Various Temperature ±1.5V 7.0 85°C 0 ±2.5V 6.5 -2 25°C -4 ±5V 5.5 GAIN (dB) GAIN (dB) 6.0 5.0 AV = +2 VS = ±5V RF = 2k AV = +1 VO = 0.2VPP 100k -40°C RL = 2k RL = 150 1M VOUT = 0.2VPP 10M 200M 10k 100k FREQUENCY (Hz) Figure 5. Closed Loop Gain vs. Frequency for Various Supplies 1M 10M 100M 500M FREQUENCY (Hz) Figure 6. Closed Loop Frequency Response for Various Temperature Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 11 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com Typical Performance Characteristics (continued) V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. 8.0 8.0 ±2.5V 6.0 4.0 4VPP ±5 V 2.0 GAIN (dB) 2.0 GAIN (dB) 2VPP ±5V 4.0 ±1.5V 6.0 0.0 0.0 ±2.5V VO = 0.2VPP AV = +2 AV = +2 RF = RL = 2k RF = RL = 2k 100k 1M 10M 1M 100k 200M 10M 200M FREQUENCY (Hz) FREQUENCY (Hz) Figure 7. Large Signal Frequency Response Figure 8. Closed Loop Small Signal Frequency Response for Various Supplies ±5V 6 ±1.5V 4 ±1.5V +0.3 2 +0.2 GAIN (dB) GAIN (dB) ±2.5V 0 0 +25 -0.1 AV = +2 RF = 806: -65 AV = +2 -110 ±2.5V RL = 150: 10M 200M 100K FREQUENCY (Hz) -20 VO = 0.4VPP RF = 806: RL 150: 1M ±5V PHASE VO = 0.4VPP 100K ±5V GAIN +0.1 PHASE (deg) ±2.5V -155 ±1.5V 1M 10M 200M FREQUENCY (Hz) Figure 9. Closed Loop Frequency Response for Various Supplies Figure 10. ±0.1dB Gain Flatness for Various Supplies 5 3 RL = 2k 4 RL = 100: VOUT (VPP) VOUT (VPP) 2 3 2 1 VS = 5V 1 VS = 3V AV = -1 0 100k 1M 10M 100M AV = -1 Rf = 2k RL = 2K to VS/2 0 100K 1M FREQUENCY (Hz) Figure 11. VOUT (VPP) for THD < 0.5% 12 Submit Documentation Feedback 10M 100M FREQUENCY (Hz) Figure 12. VOUT (VPP) for THD < 0.5% Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 Typical Performance Characteristics (continued) V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. 80 10 85°C 9 RL = 2K 8 60 GAIN (dB) VOUT (VPP) 6 5 4 PHASE (Deg) PHASE 7 40 60 GAIN 20 40 -40°C 20 3 RL = 100: 2 0 VS = ±5V 1 AV = -1 0 100k 1M 10M 100M 0 VS = ±1.5V 25°C RL= 2k -20 10k 100k 1M 10M 150M FREQUENCY (Hz) FREQUENCY (Hz) Figure 14. Open Loop Gain/Phase for Various Temperature Figure 13. VOUT (VPP) for THD < 0.5% 80 -80 85°C -75 GAIN 60 -70 40 60 20 40 25°C -65 HD2 (dBc) PHASE (Deg) GAIN (dB) PHASE 20 0 RL = 2k -20 10k 100k -50 10MHz VS = 5V -40 -40°C 1M -55 -45 0 VS = ±5V 5MHz -60 AV = -1 -35 R = 2k to V /2 L S 10M -30 150M 0 FREQUENCY (Hz) 1 2 3 4 5 VOUT (VPP) Figure 15. Open Loop Gain/Phase for Various Temperature Figure 16. HD2 (dBc) vs. Output Swing -90 -80 100:,1MHz -75 -80 -70 100:5MHz -70 -65 2k:, 5MHz HD2 (dBc) HD3 (dBc) 5MHz -60 -55 -50 -45 -60 -50 2k:, 10MHz -40 VS = 5V -40 10MHz AV = -1 -35 RL = 2k to VS/2 -30 0 1 2 3 4 5 100:, 10MHz -30 VS = 5V, AV = +2 RL = 2k: & 100: to VS/2 -20 0.0 1.0 2.0 3.0 4.0 5.0 VOUT (VPP) VOUT (VPP) Figure 17. HD3 (dBc) vs. Output Swing Figure 18. HD2 vs. Output Swing Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 13 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com Typical Performance Characteristics (continued) V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. -90 -80 100:,1MHz VS = 5V -70 -70 AV = -1 -65 THD (dBc) HD3 (dBc) RL = 2k TO VS/2 -75 -80 2k:,5MHz -60 2k:,10MHz -50 -60 5MHz -55 -50 -45 100:, 5MHz -40 -40 -30 VS = 5V, AV = +2 RL = 2k: &100: to VS/2 100:, 10MHz -20 0.0 1.0 2.0 3.0 4.0 5.0 10MHz -35 -30 0 1 2 VOUT (VPP) 3 4 5 VOUT (VPP) Figure 19. HD3 vs. Output Swing Figure 20. THD (dBc) vs. Output Swing 1k 80 100 60 40 30 10 VOLTAGE CURRENT 1 10 VS = 5V 20 AV = -1 Rf = RL = 2k CL = 8pF 0 1 1.5 0.5 INPUT STEP AMPLITUDE (VPP) 1 10 2 100 0.1 1M 10 10 VS=±1.5V VOUT FROM V (V) VS = ±1.5V 1 1 - + 1K 10K 100K FREQUENCY (Hz) Figure 22. Input Noise vs. Frequency Figure 21. Settling Time vs. Input Step Amplitude (Output Slew and Settle Time) VOUT FROM V (V) in (pA/ Hz) 10 100 50 en (nV/ Hz) ±0.1% SETTLING TIME 70 85°C 0.1 85°C 0.1 -40°C -40°C 25°C 25°C 0.01 0.01 1 14 10 100 1k 1 10 100 1K ISOURCE (mA) ISINK (mA) Figure 23. VOUT from V+ vs. ISOURCE Figure 24. VOUT from V− vs. ISINK Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 Typical Performance Characteristics (continued) V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. 10 10 VS = ±5V VS = ±5V 85°C -40°C VOUT FROM V (V) 1 - + VOUT FROM V (V) 25°C 1 85° C 0.1 -40°C 85°C 0.1 -40°C 25°C 0.01 0.01 1 10 100 1 1k 100 1k ISINK (mA) Figure 25. VOUT from V+ vs. ISOURCE Figure 26. VOUT from V− vs. ISINK 180 160 RL = 150: 85°C, Sink 85°C, Sourcing -40°C, Sink 160 140 25°C, Sink 25°C, Sourcing 140 120 120 -40°C, Sourcing ISC (mA) VOUT FROM SUPPLY (mV) 10 ISOURCE (mA) 100 80 100 25°C, Source 80 60 60 85°C, Sinking 40 -40°C, Source 25°C, Sinking 40 85°C, Source 20 -40°C, Sinking 0 20 2 3 4 5 6 7 VS (V) 8 9 2 10 4 5 6 7 8 9 10 VS (V) Figure 27. Swing vs. VS Figure 28. Short Circuit Current (to VS/2) vs. VS 1 1 VS = ±2.5 0.9 VS = ±2.5V 0.9 0.8 0.8 85°C VOUT FROM V (V) 0.7 + VOUT FROM V- (V) 3 0.6 0.5 25°C 0.4 0.3 0.2 25°C 0.7 0.6 85°C 0.5 0.4 0.3 0.2 -40°C 0.1 0.1 0 0 0 20 40 60 80 100 120 -40°C 0 20 ISINK(mA) 40 60 80 100 120 ISOURCING (mA) Figure 29. Output Sinking Saturation Voltage vs. IOUT Figure 30. Output Sourcing Saturation Voltage vs. IOUT Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 15 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com Typical Performance Characteristics (continued) V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. 1000 90 AV = +1 VS = 5V 80 100 AV = +10 70 + PSRR PSRR (dB) ZOUT (:) 60 10 1 50 40 - PSRR 30 20 0.1 10 0.01 1k 0 10k 100k 10M 1M 100M 10k 100k FREQUENCY (Hz) 100 100 90 90 80 80 70 60 50 100M 70 60 50 VS = 5V 40 40 AV = +6 30 100 1k Receive CH.: AV = +2, Rf = Rg = 510 30 10k 100k 1M 10M 1k 10k 100k 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) Figure 33. CMRR vs. Frequency Figure 34. Crosstalk Rejection vs. Frequency (Output to Output) 2 1 VS = 10V VS = 5V 0.8 1.5 RL = 150: to V+/2 0.6 1.0 0.4 85°C 0.2 VOS (mV) VOS (mV) 10M Figure 32. PSRR vs. Frequency CT (rej) (dB) CMRR (dB) Figure 31. Closed Loop Output Impedance vs. Frequency, AV = +1 85°C 0 -0.2 -0.4 0.5 0 25°C -0.5 25°C -1 -40°C -0.6 -1.5 -0.8 -40°C -1 -2 -2 VOUT (V) 4 VCM (V) Figure 35. VOS vs. VOUT (Typical Unit) Figure 36. VOS vs. VCM (Typical Unit) 0 16 1M FREQUENCY (Hz) 1 2 3 Submit Documentation Feedback 4 5 0 2 6 8 10 Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 Typical Performance Characteristics (continued) V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. 1 1 -40°C 0.8 0.8 Unit #1 0.6 0.4 0.4 0.2 0.2 VOS (mV) VOS (mV) Unit #1 0.6 0 -0.2 25°C 0 Unit #2 -0.2 Unit #2 -0.4 -0.4 Unit #3 -0.6 -0.6 Unit #3 -0.8 -0.8 -1 -1 2 4 6 8 10 12 2 3 4 5 6 8 7 9 10 11 VS (V) VS (V) Figure 37. VOS vs. VS (for 3 Representative Units) Figure 38. VOS vs. VS (for 3 Representative Units) 1 -1000 0.8 -1100 Unit #1 -1200 0.4 -1300 0.2 IB (nA) VOS (mV) 85°C 0.6 0 Unit #2 -0.2 -40°C -1400 25°C -1500 -1600 -0.4 85°C -1700 -0.6 Unit #3 -1800 -0.8 -1900 -1 2 3 4 5 6 8 7 9 10 2 12 4 6 10 12 Figure 40. IB vs. VS Figure 39. VOS vs. VS (for 3 Representative Units) 50 4 45 3.5 VS = 10V 85°C IS (mA) (PER CHANNEL) 40 35 IOS (nA) 8 VS (V) VS (V) 30 25 -40°C 20 15 25°C 10 5 4 25°C 2 -40°C 1.5 1 0.5 0 85°C 0 2 3 2.5 6 8 10 12 -0.5 -2 VS (V) 4 VCM (V) Figure 41. IOS vs. VS Figure 42. IS vs. VCM Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 0 2 6 8 10 Submit Documentation Feedback 17 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com Typical Performance Characteristics (continued) V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. 4 VS = 3V VO = 100mVPP 85°C IS (mA) (PER CHANNEL) RL = 2k to VS/2 AV = -1 3 25°C 2 -40°C 1 20 ns/DIV 40 mV/DIV 2 4 6 8 10 12 VS (V) Figure 43. IS vs. VS Figure 44. Small Signal Step Response AV = +2 VS = ±5V VO = 8VPP AV = +1 RL= 2k VS=±1.5V VO=2VPP AV= -1 RL=2k 4 /DIV 200.0 ns/DIV Figure 45. Large Signal Step Response 400 mV/DIV Figure 46. Large Signal Step Response VS = 3V VS = ±5V VO = 100mVPP VO = 100mVPP RL = 2k to VS/2 AV = +1, RL = 2k AV = +1 40 mV/DIV 10 ns/DIV Figure 47. Small Signal Step Response 18 Submit Documentation Feedback 40.0 nS/DIV 40 mV/DIV 10.0 ns/DIV Figure 48. Small Signal Step Response Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 Typical Performance Characteristics (continued) V+ = +5, V− = −5V, RF = RL = 2kΩ. Unless otherwise specified. VS = ±5V VS = ±5V VO = 200mVPP AV = +2, RL = 2k VO = 100mVPP RL = 2k AV = -1 40 mV/DIV 20 ns/DIV Figure 49. Small Signal Step Response 2 V/DIV 20.0 ns/DIV 40 mV/DIV Figure 50. Small Signal Step Response VS = ±5V VS = ±5V VO = 8VPP VO = 2VPP AV = +2 RL = 2k RL = 2k AV = -1 40.0 ns/DIV 400 mV/DIV Figure 52. Large Signal Step Response Figure 51. Large Signal Step Response AV = -1 VS = ±5V VOUT = 8VPP RL = 2K: 2 V/DIV 20 ns/DIV 100 ns/DIV Figure 53. Large Signal Step Response Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 19 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Circuit Description The LMH664X family is based on Texas Instruments' proprietary VIP10 dielectrically isolated bipolar process. This device family architecture features the following: • Complimentary bipolar devices with exceptionally high ft (∼8 GHz) even under low supply voltage (2.7 V) and low bias current. • A class A-B “turn-around” stage with improved noise, offset, and reduced power dissipation compared to similar speed devices (patent pending). • Common Emitter push-push output stage capable of 75mA output current (at 0.5V from the supply rails) while consuming only 2.7 mA of total supply current per channel. This architecture allows output to reach within milli-volts of either supply rail. • Consistent performance over the entire operating supply voltage range with little variation for the most important specifications (for example, BW, SR, IOUT, and so forth). • Significant power saving (∼40%) compared to competitive devices on the market with similar performance. 8.1.1 Application Hints This Op Amp family is a drop-in replacement for the AD805X family of high speed Op Amps in most applications. In addition, the LMH664X will typically save about 40% on power dissipation, due to lower supply current, when compared to competition. All AD805X family’s ensured parameters are included in the list of LMH664X ensured specifications in order to ensure equal or better level of performance. However, as in most high performance parts, due to subtleties of applications, it is strongly recommended that the performance of the part to be evaluated is tested under actual operating conditions to ensure full compliance to all specifications. With 3V supplies and a common mode input voltage range that extends 0.5V below V−, the LMH664X find applications in low voltage/low power applications. Even with 3V supplies, the −3dB BW (@ AV = +1) is typically 115MHz with a tested limit of 80MHz. Production testing ensures that process variations with not compromise speed. High frequency response is exceptionally stable confining the typical −3dB BW over the industrial temperature range to ±2.5%. As can be seen from the Typical Performance Characteristics, the LMH664X output current capability (∼75mA) is enhanced compared to AD805X. This enhancement, increases the output load range, adding to the LMH664X’s versatility. Because of the LMH664X’s high output current capability attention should be given to device junction temperature in order not to exceed the Absolute Maximum Rating. 20 Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 Circuit Description (continued) This device family was designed to avoid output phase reversal. With input overdrive, the output is kept near supply rail (or as closed to it as mandated by the closed loop gain setting and the input voltage). See Figure 54: Output V + VOUT (VPP) Input V VS = ±2.5V - AV = +1 1V/DIV 200 ns/DIV Figure 54. Input and Output Shown with CMVR Exceeded However, if the input voltage range of −0.5V to 1V from V+ is exceeded by more than a diode drop, the internal ESD protection diodes will start to conduct. The current in the diodes should be kept at or below 10mA. Output overdrive recovery time is less than 100ns as can be seen from Figure 55 plot: VIN (1 V/DIV) VS=±5V, VIN=5VPP AV=+5, RF=RL=2k 2 V/DIV VOUT (2 V/DIV) 100 ns/DIV Figure 55. Overload Recovery Waveform Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 21 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com Circuit Description (continued) 8.1.2 Input and Output Topology All input / output pins are protected against excessive voltages by ESD diodes connected to V+ and V- rails (see Figure 56). These diodes start conducting when the input / output pin voltage approaches 1Vbe beyond V+ or Vto protect against over voltage. These diodes are normally reverse biased. Further protection of the inputs is provided by the two resistors (R in Figure 56), in conjunction with the string of anti-parallel diodes connected between both bases of the input stage. The combination of these resistors and diodes reduces excessive differential input voltages approaching 2Vbe. The most common situation when this occurs is when the device is used as a comparator (or with little or no feedback) and the device inputs no longer follow each other. In such a case, the diodes may conduct. As a consequence, input current increases and the differential input voltage is clamped. It is important to make sure that the subsequent current flow through the device input pins does not violate the Absolute Maximum Ratings of the device. To limit the current through this protection circuit, extra series resistors can be placed. Together with the built-in series resistors of several hundred ohms, these external resistors can limit the input current to a safe number (i.e. < 10mA). Be aware that these input series resistors may impact the switching speed of the device and could slow down the device. V+ V+ V+ R R IN- IN+ V- V- Figure 56. Input Equivalent Circuit 22 Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 8.2 Single Supply, Low Power Photodiode Amplifier The circuit shown in Figure 57 is used to amplify the current from a photo-diode into a voltage output. In this circuit, the emphasis is on achieving high bandwidth and the transimpedance gain setting is kept relatively low. Because of its high slew rate limit and high speed, the LMH664X family lends itself well to such an application. This circuit achieves approximately 1V/mA of transimpedance gain and capable of handling up to 1mApp from the photodiode. Q1, in a common base configuration, isolates the high capacitance of the photodiode (Cd) from the Op Amp input in order to maximize speed. Input is AC coupled through C1 to ease biasing and allow single supply operation. With 5V single supply, the device input/output is shifted to near half supply using a voltage divider from VCC. Note that Q1 collector does not have any voltage swing and the Miller effect is minimized. D1, tied to Q1 base, is for temperature compensation of Q1’s bias point. Q1 collector current was set to be large enough to handle the peak-to-peak photodiode excitation and not too large to shift the U1 output too far from mid-supply. No matter how low an Rf is selected, there is a need for Cf in order to stabilize the circuit. The reason for this is that the Op Amp input capacitance and Q1 equivalent collector capacitance together (CIN) will cause additional phase shift to the signal fed back to the inverting node. Cf will function as a zero in the feedback path counteracting the effect of the CIN and acting to stabilized the circuit. By proper selection of Cf such that the Op Amp open loop gain is equal to the inverse of the feedback factor at that frequency, the response is optimized with a theoretical 45° phase margin. CF =  SQRT (CIN)/(2S˜GBWP ˜RF) where GBWP is the Gain Bandwidth Product of the Op Amp (1) Optimized as such, the I-V converter will have a theoretical pole, fp, at: fP = SQRT GBWP/(2SRF ˜CIN) (2) With Op Amp input capacitance of 3pF and an estimate for Q1 output capacitance of about 3pF as well, CIN = 6pF. From Typical Performance Characteristics, LMH6642/6643 family GBWP is approximately 57 MHz. Therefore, with Rf = 1k, from Equation 1 and Equation 2 above. Cf = ∼4.1 pF, and fp = 39 MHz Cf 5pF Photodiode Equivalent Circuit Vbias Rbias Rf 1k: C1 100nF Q1 2N3904 VCC = +5V -1mAPP - Photodiode Id Cd 10 200pF Rd ×100k: R5 510: R2 1.8k: x Vout + D1 1N4148 R11 910 : R10 1k: R3 1k: +5V Figure 57. Single Supply Photodiode I-V Converter Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 23 LMH6642Q-Q1, LMH6643Q-Q1 SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 www.ti.com Single Supply, Low Power Photodiode Amplifier (continued) For this example, optimum Cf was empirically determined to be around 5pF. This time domain response is shown in Figure 58 below showing about 9 ns rise/fall times, corresponding to about 39 MHz for fp. The overall supply current from the +5 V supply is around 5 mA with no load. 200 mV/DIV 20 ns/DIV Figure 58. Converter Step Response (1VPP, 20 ns/DIV) 8.3 Printed Circuit Board Layout and Component Values Section Generally, a good high frequency layout will keep power supply and ground traces away from the inverting input and output pins. Parasitic capacitances on these nodes to ground will cause frequency response peaking and possible circuit oscillations (see Application Note OA-15 (SNOA367) for more information). Texas Instruments suggests the following evaluation boards as a guide for high frequency layout and as an aid in device testing and characterization: DEVICE PACKAGE EVALUATION BOARD PN LMH6642QMF 5-Pin SOT-23 LMH730216 LMH6643QMM 8-Pin VSSOP LMH730123 Another important parameter in working with high speed/high performance amplifiers, is the component values selection. Choosing external resistors that are large in value will effect the closed loop behavior of the stage because of the interaction of these resistors with parasitic capacitances. These capacitors could be inherent to the device or a by-product of the board layout and component placement. Either way, keeping the resistor values lower, will diminish this interaction to a large extent. On the other hand, choosing very low value resistors could load down nodes and will contribute to higher overall power dissipation. 24 Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 LMH6642Q-Q1, LMH6643Q-Q1 www.ti.com SNOSC61C – JANUARY 2012 – REVISED SEPTEMBER 2014 9 Device and Documentation Support 9.1 Documentation Support 9.1.1 Related Documentation 9.2 Related Links The table below lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy. Table 1. Related Links PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL DOCUMENTS TOOLS & SOFTWARE SUPPORT & COMMUNITY LMH6642Q-Q1 Click here Click here Click here Click here Click here LMH6643Q-Q1 Click here Click here Click here Click here Click here 9.3 Trademarks All trademarks are the property of their respective owners. 9.4 Electrostatic Discharge Caution 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. 9.5 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 10 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: LMH6642Q-Q1 LMH6643Q-Q1 Submit Documentation Feedback 25 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) LMH6642QMF/NOPB ACTIVE SOT-23 DBV 5 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 85 A64Q LMH6642QMFX/NOPB ACTIVE SOT-23 DBV 5 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 85 A64Q LMH6643QMM/NOPB ACTIVE VSSOP DGK 8 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 85 643Q LMH6643QMMX/NOPB ACTIVE VSSOP DGK 8 3500 RoHS & Green SN Level-1-260C-UNLIM -40 to 85 643Q (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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