Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Voltage feedback SOIC 8

LMH6628

www.ti.com

SNOSA02D –MAY 2002–REVISED MARCH 2013

LMH6628 Dual Wideband, Low Noise, Voltage Feedback Op Amp

Check for Samples: LMH6628

FEATURES

DESCRIPTION

The Texas Instruments LMH6628 is a high speed

• Wide Unity Gain Bandwidth: 300MHz

dual op amp that offers a traditional voltage feedback

• Low Noise: 2nV/√hZ

topology featuring unity gain stability and slew

• Low Distortion: −65/−74dBc (10MHz)

enhanced circuitry. The LMH6628's low noise and

very low harmonic distortion combine to form a wide

• Settling Time: 12ns to 0.1%

dynamic range op amp that operates from a single

• Wide Supply Voltage Range: ±2.5V to ±6V

(5V to 12V) or dual (±5V) power supply.

• High Output Current: ±85mA

Each of the LMH6628's closely matched channels

• Improved Replacement for CLC428

provides a 300MHz unity gain bandwidth and low

input voltage noise density (2nV/√hZ). Low 2nd/3rd

APPLICATIONS

harmonic distortion (−65/−74dBc at 10MHz) make the

LMH6628 a perfect wide dynamic range amplifier for

• High Speed Dual Op Amp

matched I/Q channels.

• Low Noise Integrators

With its fast and accurate settling (12ns to 0.1%), the

• Low Noise Active Filters

LMH6628 is also an excellent choice for wide

• Driver/receiver for Transmission Systems

dynamic range, anti-aliasing filters to buffer the inputs

• High Speed Detectors

of hi resolution analog-to-digital converters.

Combining the LMH6628's two tightly matched

• I/Q Channel Amplifiers

amplifiers in a single 8-pin SOIC package reduces

cost and board space for many composite amplifier

applications such as active filters, differential line

drivers/receivers, fast peak detectors and

instrumentation amplifiers.

The LMH6628 is fabricated using TI’s VIP10™

complimentary bipolar process.

To reduce design times and assist in board layout,

the LMH6628 is supported by an evaluation board

(CLC730036).

Connection Diagram

Figure 1. 8-Pin SOIC, Top View

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.

2VIP10 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 (21 pages)

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LMH6628 www.ti.com SNOSA02D – MAY 2002 – REVISED MARCH 2013 LMH6628 Dual Wideband, Low Noise, Voltage Feedback Op Amp Check for Samples: LMH6628 FEATURES DESCRIPTION • • • • • • • The Texas Instruments LMH6628 is a high speed dual op amp that offers a traditional voltage feedback topology featuring unity gain stability and slew enhanced circuitry.
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LMH6628 SNOSA02D – MAY 2002 – REVISED MARCH 2013 www.ti.com Figure 2. Inverting Frequency Response 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 (1) (2) Human Body Model ESD Tolerance (3) 2kV Machine Model 200V Supply Voltage 13.
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LMH6628 www.ti.com SNOSA02D – MAY 2002 – REVISED MARCH 2013 Electrical Characteristics (1) VCC = ±5V, AV = +2V/V, RF = 100Ω, RG = 100Ω, RL = 100Ω; unless otherwise specified. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min Typ Max Units Frequency Domain Response GB Gain Bandwidth Product VO < 0.5VPP SSBW -3dB Bandwidth, AV = +1 VO < 0.5VPP SSBW -3dB Bandwidth, AV = +2 VO < 0.5VPP GFL Gain Flatness VO< 0.
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LMH6628 SNOSA02D – MAY 2002 – REVISED MARCH 2013 www.ti.com Electrical Characteristics(1) (continued) VCC = ±5V, AV = +2V/V, RF = 100Ω, RG = 100Ω, RL = 100Ω; unless otherwise specified. Boldface limits apply at the temperature extremes. Symbol VO Parameter Output Voltage Range VOL RL = 100Ω CMIR Input Voltage Range IO Output Current 4 Conditions Min RL = ∞ ±3.2 ±3.1 Common- Mode ±50 Submit Documentation Feedback Typ Max Units ±3.8 V ±3.5 V ±3.
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LMH6628 www.ti.com SNOSA02D – MAY 2002 – REVISED MARCH 2013 Typical Performance Characteristics (TA = +25°, AV = +2, VCC = ±5V, Rf =100Ω, RL = 100Ω, unless specified) Non-Inverting Frequency Response Inverting Frequency Response Figure 3. Figure 4. Frequency Response vs. Load Resistance Frequency Response vs. Output Amplitude Figure 5. Figure 6. Frequency Response vs. Capacitive Load Gain Flatness & Linear Phase Figure 7. Figure 8.
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LMH6628 SNOSA02D – MAY 2002 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) (TA = +25°, AV = +2, VCC = ±5V, Rf =100Ω, RL = 100Ω, unless specified) 6 Channel Matching Channel to Channel Crosstalk Figure 9. Figure 10. Pulse Response (VO = 2V) Pulse Response (VO = 100mV) Figure 11. Figure 12. 2nd Harmonic Distortion vs. Output Voltage 3rd Harmonic Distortion vs. Output Voltage Figure 13. Figure 14.
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LMH6628 www.ti.com SNOSA02D – MAY 2002 – REVISED MARCH 2013 Typical Performance Characteristics (continued) (TA = +25°, AV = +2, VCC = ±5V, Rf =100Ω, RL = 100Ω, unless specified) 2nd & 3rd Harmonic Distortion vs. Frequency PSRR and CMRR (±5V) Figure 15. Figure 16. PSRR and CMRR (±2.5V) Closed Loop Output Resistance (±2.5V) Figure 17. Figure 18. Closed Loop Output Resistance (±5V) Open Loop Gain & Phase (±2.5V) Figure 19. Figure 20.
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LMH6628 SNOSA02D – MAY 2002 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) (TA = +25°, AV = +2, VCC = ±5V, Rf =100Ω, RL = 100Ω, unless specified) Open Loop Gain & Phase (±5V) Recommended RS vs. CL Figure 21. Figure 22. DC Errors vs. Temperature Maximum VO vs. RL 0.5 0.2 0.2 VIO 0 0.1 -0.2 0 -0.4 IBN -0.1 -0.2 -0.3 -40 -0.6 IBI IBN, IBI (PA) 0.4 0.3 MAXIMUM VO (VOLTS) 0.6 0.4 VIO (mV) 4 0.8 VS = ±5V 3.5 3 -0.8 0 40 80 120 -1 160 2.
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LMH6628 www.ti.com SNOSA02D – MAY 2002 – REVISED MARCH 2013 Typical Performance Characteristics (continued) (TA = +25°, AV = +2, VCC = ±5V, Rf =100Ω, RL = 100Ω, unless specified) Voltage & Current Noise vs. Frequency 2-Tone, 3rd Order Intermodulation Intercept 1000 40 30 20 1000 100 100 CURRENT NOISE 10 10 VOLTAGE NOISE 10 1 1 100 10 1 10 FREQUENCY (MHz) 100 1k 10k 100k 1M CURRENT NOISE (pA/ Hz) VOLTAGE NOISE (nV/ Hz) INTERCEPT POINT (+dBm) 50 1 10M FREQUENCY (Hz) Figure 25.
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LMH6628 SNOSA02D – MAY 2002 – REVISED MARCH 2013 www.ti.com APPLICATION SECTION LOW NOISE DESIGN Ultimate low noise performance from circuit designs using the LMH6628 requires the proper selection of external resistors. By selecting appropriate low valued resistors for RF and RG, amplifier circuits using the LMH6628 can achieve output noise that is approximately the equivalent voltage input noise of 2nV/ multiplied by the desired gain (AV).
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LMH6628 www.ti.com SNOSA02D – MAY 2002 – REVISED MARCH 2013 VIN, VOUT (100mV/DIV) VIN VOUT TIME (10 ns/DIV) Figure 29. Delay Circuit Response to 0.5V Pulse The circuit gain is +1 and the delay is determined by the following equations. (1) Td 1 dI ; (2) 360 df where Td is the delay of the op amp at AV = +1. The LMH6628 provides a typical delay of 2.8ns at its −3dB point.
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LMH6628 SNOSA02D – MAY 2002 – REVISED MARCH 2013 www.ti.com Care must be given to layout and component placement to maintain a high frequency common-mode rejection. The plot of Figure 31 shows the simultaneous reception of signals transmitted at 1MHz and 10MHz. Figure 31. Simultaneous Reception of Signals Transmitted at 1MHz and 10MHz POSITIVE PEAK DETECTOR The LMH6628's dual amplifiers can be used to implement a unity-gain peak detector circuit as shown in Figure 32. Figure 32.
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LMH6628 www.ti.com SNOSA02D – MAY 2002 – REVISED MARCH 2013 A current source, built around Q1, provides the necessary bias current for the second amplifier and prevents saturation when power is applied. The resistor, R, closes the loop while diode D2 prevents negative saturation when VIN is less than VC. A MOS-type switch (not shown) can be used to reset the capacitor's voltage. The maximum speed of detection is limited by the delay of the op amps and the diodes.
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LMH6628 SNOSA02D – MAY 2002 – REVISED MARCH 2013 www.ti.com Figure 35. Example of Response of Circuit of Figure 34, Where fo is 2.
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LMH6628 www.ti.com SNOSA02D – MAY 2002 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision C (March 2013) to Revision D • 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 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LMH6628MAX/NOPB Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 5.4 2.0 8.0 W Pin1 (mm) Quadrant 12.
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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) LMH6628MAX/NOPB SOIC D 8 2500 367.0 367.0 35.
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