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Product details

Parameters

Architecture Current FB Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 5 Total supply voltage (Max) (+5V=5, +/-5V=10) 12 GBW (Typ) (MHz) 210 BW @ Acl (MHz) 210 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 820 Vn at flatband (Typ) (nV/rtHz) 3.7 Vn at 1 kHz (Typ) (nV/rtHz) 3.7 Iq per channel (Typ) (mA) 1.7 Vos (offset voltage @ 25 C) (Max) (mV) 3.5 Rail-to-rail No Features Shutdown Rating Catalog Operating temperature range (C) -40 to 85 CMRR (Typ) (dB) 60 Input bias current (Max) (pA) 10000000 Offset drift (Typ) (uV/C) 12 Output current (Typ) (mA) 120 2nd harmonic (dBc) 67 3rd harmonic (dBc) 70 @ MHz 5 open-in-new Find other High-speed op amps (GBW>=50MHz)

Package | Pins | Size

SOIC (D) 8 19 mm² 3.91 x 4.9 SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other High-speed op amps (GBW>=50MHz)

Features

  • MINIMAL BANDWIDTH CHANGE VERSUS GAIN
  • > 120MHz BANDWIDTH TO GAIN > +10
  • LOW DISTORTION: < –78dBc at 5MHz
  • HIGH OUTPUT CURRENT: 120mA
  • SINGLE +5V TO +12V SUPPLY OPERATION
  • DUAL ±2.5 TO ±6.0V SUPPLY OPERATION
  • LOW SUPPLY CURRENT: 1.7mA
  • LOW SHUTDOWN CURRENT: 100µA
  • APPLICATIONS
    • LOW-POWER BROADCAST VIDEO DRIVERS
    • EQUALIZING FILTERS
    • SAW FILTER HIGH GAIN POST AMPLIFIERS
    • MULTICHANNEL SUMMING AMPLIFIERS
    • PROFESSIONAL CAMERAS
    • ADC INPUT DRIVERS

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open-in-new Find other High-speed op amps (GBW>=50MHz)

Description

The OPA684 provides a new level of performance in low-power, wideband, current-feedback (CFB) amplifiers. This CFBplus amplifier is the first to use an internally closed-loop input buffer stage that enhances performance significantly over earlier low-power CFB amplifiers. While retaining the benefits of very low power operation, this new architecture provides many of the benefits of a more ideal CFB amplifier. The closed-loop input stage buffer gives a very low and linearized impedance path at the inverting input to sense the feedback error current. This improved inverting input impedance retains exceptional bandwidth to much higher gains and improves harmonic distortion over earlier solutions limited by inverting input linearity. Beyond simple high-gain applications, the OPA684 CFBplus amplifier permits the gain setting element to be set with considerable freedom from amplifier bandwidth interaction. This allows frequency response peaking elements to be added, multiple input inverting summing circuits to have greater bandwidth, and low-power line drivers to meet the demanding requirements of studio cameras and broadcast video.

The output capability of the OPA684 also sets a new mark in performance for low-power current feedback amplifiers. Delivering a full ±4Vpp swing on ±5V supplies, the OPA684 also has the output current to support this swing into a 100 load. This minimal output headroom requirement is complemented by a similar 1.2V input stage headroom giving exceptional capability for single +5V operation.

The OPA684’s low 1.7mA supply current is precisely trimmed at 25°C. This trim, along with low shift over temperature and supply voltage, gives a very robust design over a wide range of operating conditions. System power may be further reduced by using the optional disable control pin. Leaving this disable pin open, or holding it HIGH, gives normal operation. If pulled LOW, the OPA684 supply current drops to less than 100µA while the I/O pins go to a high impedance state.

open-in-new Find other High-speed op amps (GBW>=50MHz)
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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet Low-Power, Current Feedback Operational Amplifier With Disable datasheet (Rev. D) Jun. 19, 2009
Technical articles How to reduce distortion in high-voltage, high-frequency signal generation for AWGs Oct. 30, 2018
Technical articles What are the advantages of using JFET-input amplifiers in high-speed applications? Jun. 18, 2018
Technical articles Unique active mux capability combines buffer and switch into one solution Oct. 10, 2017
White papers The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical articles How to minimize filter loss when you drive an ADC Oct. 20, 2016
Application notes RLC Filter Design for ADC Interface Applications (Rev. A) May 13, 2015
Application notes Wideband Complementary Current Output DAC Single-Ended Interface (Rev. A) May 08, 2015
Application notes Considerations for High-Gain Multistage Designs May 13, 2013
User guides DEM-OPA-SO-1A User's Guide (Rev. B) Apr. 12, 2012
User guides DEM-OPA-SOT-1A User's Guide (Rev. B) Apr. 12, 2012
Application notes A Numerical Solution to an Analog Problem Apr. 25, 2010
Application notes Making the Most of a Low-Power, High-Speed Operational Amplifier Nov. 22, 2009
User guides DEM-OPA-SOT-1A User's Guide (Rev. A) Mar. 22, 2006
User guides DEM-OPA-SO-1A User's Guide (Rev. A) Mar. 16, 2006
Application notes Expanding the usability of current-feedback amplifiers Feb. 28, 2005
Application notes Active filters using current-feedback amplifiers Feb. 25, 2005
Application notes Noise Analysis for High Speed Op Amps (Rev. A) Jan. 17, 2005
Application notes Stabilizing Current-Feedback Op Amps While Optimizing Circuit Performance Apr. 28, 2004
Application notes ADS5500, OPA695: PC Board Layout for Low Distortion High-Speed ADC Drivers Apr. 22, 2004
Application notes Measuring Board Parasitics in High-Speed Analog Design Jul. 07, 2003
Application notes Current Feedback Amplifiers: Review, Stability Analysis, and Applications Nov. 20, 2000

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
5
Description

The DEM-OPA-SO-1A demonstration fixture helps designers evaluate the operation and performance of TI's High Speed, Wide Bandwidth Operational Amplifiers. This unpopulated PC board is compatible with products offered in the 8-lead SOIC (D) package.

EVALUATION BOARDS Download
document-generic User guide
5
Description

The DEM-OPA-SOT-1A is a demonstration fixture that helps designers evaluate the operation and performance of TI's High Speed, Wide Bandwidth Operational Amplifiers. This unpopulated PC board is compatible with products offered in the SOT(DBV) package.

Design tools & simulation

SIMULATION MODELS Download
SBOC123B.TSC (101 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOM198A.ZIP (5 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SBOM628.ZIP (38 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
CALCULATION TOOLS Download
Analog engineer's calculator
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
Features
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)
CALCULATION TOOLS Download
Voltage Divider Determines A Set of Resistors for a Voltage Divider
VOLT-DIVIDER-CALC VOLT-DIVIDER-CALC quickly determines a set of resistors for a voltage divider. This KnowledgeBase Javascript utility can be used to find a set of resistors for a voltage divider to achieve the desired output voltage. This calculator can also be used to design non-inverting attentuation circuits.

(...)

Reference designs

REFERENCE DESIGNS Download
Reference Design for High-Gain Multistage Amplifier
TIDA-00066 Using the LMH6629 and OPA684 op amps, this reference design deals with the difficulties and limitations of developing very high gain, multistage amplifier circuits. Supported by a full scale application report including theory, simulations, board design and evaluation, this design can be easily (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
SOT-23 (DBV) 6 View options

Ordering & quality

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