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Texas Instruments OPA660AU
- Part No.:
- OPA660AU
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA660AU.pdf
- Description:
- IC OPAMP TRANSCOND 850MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
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Product details
Overview
OPA660AU from Burr-Brown (now Texas Instruments) is a monolithic wideband operational transconductance amplifier (OTA) with integrated open-loop buffer, designed for high-speed video, RF/IF, and precision analog signal processing. It delivers 850MHz small-signal bandwidth, 3000V/µs slew rate, and 0.06%/0.02° differential gain/phase error at 3.58MHz - enabling use in broadcast-grade baseline restore, fiber-optic LED drivers, and ns-pulse integrators.
For engineers reviewing the OPA660AU datasheet, OPA660AU pinout, OPA660AU application, or OPA660AU equivalent, this page provides verified specifications, SO-8 package layout, real-world OTA/buffer functional partitioning, and validated alternatives for video, communications, and high-speed data acquisition designs.
Technical Context
The OPA660AU integrates two independent analog sections: a voltage-controlled current source (OTA) with B/E/C terminals mimicking transistor behavior but offering self-biasing, temperature-stable transconductance (75–200 mA/V), and external IQ control via RQ; and a separate open-loop emitter-follower buffer delivering unity-gain bandwidth up to 850MHz with no internal feedback network.
Its architecture supports direct-feedback, common-E, common-C, and current-conveyor configurations. Quiescent current (±3 to ±26mA total) is programmable via pin 1 (IAdj) and directly scales transconductance, slew rate, and output impedance - enabling trade-offs between speed, linearity, and power in AGC loops, LED drivers, and active filters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 850MHz at ±100mV output - enables full HD video and 400MHz differential input amplification without peaking compensation. |
| Slew Rate | 3000V/µs - supports clean 2V-step settling in 25ns (0.1%), critical for fast pulse integrators and control loop amplifiers. |
| Differential Gain/Phase Error | 0.06% / 0.02° at 3.58MHz - meets broadcast NTSC/PAL luminance fidelity requirements without external trimming. |
| Transconductance (gm) | 125mA/V typical at IQ=20mA - defines OTA gain in current-mode circuits (e.g., G = gm·RL), stable over temperature due to IQ tracking. |
| Input Impedance | 1.0MΩ || 2.1pF - high-Z B-input allows direct connection to high-impedance sources (e.g., photodiode preamps, sensor bridges). |
| Output Current Capability | ±15mA OTA C-output, ±15mA buffer - sufficient to drive 50Ω loads directly or bias laser diodes in fiber-optic transmitters. |
| Supply Voltage Range | ±4.5V to ±5.5V - operates from standard dual-rail supplies; absolute max ±6V prevents latch-up during transient overvoltage. |
Pinout & Package
OPA660AU is housed in an SO-8 surface-mount package (Package Drawing D, 8-pin, JEDEC MS-012AC), specified for –25°C to +85°C operation. Pin 1 is IAdj (quiescent current control), pins 3 and 8 are OTA B and C terminals, pin 2 is OTA E, pins 5 and 6 are buffer In and Out, and pins 4 and 7 are V– and V+ respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IAdj) | Quiescent current programming node | Connects external RQ to V– to set total IQ; 250Ω yields ~20mA, scaling gm, bandwidth, and slew rate linearly. |
| 2 (E) | OTA emitter terminal | Low-impedance input/output node; used as summing junction in common-E amplifiers or current sink/source path. |
| 3 (B) | OTA base terminal | High-impedance voltage input (1.0MΩ || 2.1pF); controls C-output current polarity and magnitude. |
| 4 (V–) | Negative supply rail | Must be bypassed with 2.2µF tantalum + 10nF ceramic; internal diode clamps limit input to V– –0.7V. |
| 5 (In) | Buffer input | High-impedance buffer input (1.0MΩ || 2.1pF); requires series resistor (25–200Ω) to suppress peaking. |
| 6 (Out) | Buffer output | Low-impedance emitter-follower output (7Ω || 2pF); not current-limited - avoid sustained short to ground. |
| 7 (V+) | Positive supply rail | Must be bypassed identically to V–; supplies both OTA and buffer sections independently. |
| 8 (C) | OTA collector terminal | Current-output node (±15mA); sinks current for positive B–E voltage, sources for negative - enables bidirectional current steering. |
Key Features
| Feature | Design Value |
|---|---|
| Versatile OTA architecture | Three-terminal (B/E/C) voltage-controlled current source enabling transistor-like circuit topologies (common-E/B/C) with self-biasing and no external DC bias networks. |
| Programmable quiescent current | RQ-controlled IQ (±3 to ±26mA) simultaneously optimizes OTA gm, buffer slew rate, and output impedance - simplifies system-level power/speed tuning. |
| Ultra-low video distortion | 0.06% differential gain and 0.02° phase error at 3.58MHz ensure broadcast-compliant color fidelity without post-correction circuitry. |
| Open-loop buffer section | 850MHz bandwidth, 3000V/µs slew rate, and 7Ω output impedance enable direct interstage buffering without feedback stability concerns. |
| High-speed pulse integration | Capable of integrating sub-ns pulses (e.g., 1ns rise time) with <25ns 0.1% settling - validated in Figure 17 for ns-pulse integrator applications. |
Applications
| Baseline Restore Circuits | Video/Broadcast Equipment |
|---|---|
Use Scenario: Restoring DC level in composite video signals after AC coupling to eliminate brightness drift. IC Role / Device Role / Timing Role: OTA configured as a current conveyor (CCII) with diode-based DC restoration loop (Figure 11), using buffer for low-impedance output drive. Use Value: Achieves <0.1% gain error and <0.05° phase shift across 0–5MHz, meeting SMPTE 170M luminance standards without trim components. |
Use Scenario: Driving RGB signal paths in professional broadcast cameras and switchers requiring minimal crosstalk and group delay variation. IC Role / Device Role / Timing Role: Dual-section use: OTA as high-linearity gain stage, buffer as 75Ω cable driver (Figure 21 luminance matrix). Use Value: 0.06%/0.02° differential error at 3.58MHz ensures accurate color reproduction; 850MHz bandwidth supports 1080p60 signal integrity. |
| High-Speed Data Acquisition | Wideband LED Driver |
Use Scenario: Front-end amplification and pulse conditioning in digitizers sampling >200MS/s with ns-scale timing resolution. IC Role / Device Role / Timing Role: OTA in common-E configuration for fast current-mode gain, buffer for low-jitter output buffering (Figure 14 comparator variant). Use Value: 25ns 0.1% settling on 2V steps and 1ns rise time enable precise sample-and-hold timing alignment and reduced aperture uncertainty. |
Use Scenario: Modulating laser diodes in fiber-optic transmitters operating at 100Mbps–1Gbps with minimal overshoot and ringing. IC Role / Device Role / Timing Role: OTA as current source controlling laser bias, buffer as high-slew-rate modulation driver (Figure 15). Use Value: ±15mA output current and 3000V/µs slew rate support clean 1ns edge transitions; low output impedance minimizes parasitic resonance with diode capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband OTA and buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6723MA/NOPB | Single 1.8GHz current-feedback amplifier; no separate OTA section; fixed 5V supply only; no IQ programming. | Optimized for unity-gain stable voltage-mode amplification, not current-mode signal processing or AGC loops. | Select when needing higher bandwidth (>1GHz) in voltage-feedback topology without OTA flexibility. |
| THS3201D | 1.8GHz current-feedback amplifier with disable pin; no OTA functionality; 12mA quiescent current fixed; SO-8 package. | Targeted at high-speed ADC drivers and DAC outputs; lacks degenerative gain control and current-source versatility. | Choose for low-noise, high-impedance load driving where OTA programmability is unnecessary. |
Compared with LMH6723MA/NOPB and THS3201D, the OPA660AU uniquely combines programmable transconductance, true three-terminal OTA operation, and a dedicated high-speed buffer - making it irreplaceable for AGC multipliers, ns-pulse integrators, and baseline restore circuits requiring simultaneous current- and voltage-mode signal paths.
Availability
OPA660AU is available at Aetrix Electronics and suitable for video broadcast equipment, high-speed data acquisition systems, and wideband LED driver designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA660AU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog ICs including op amps, data converters, and interface products for test & measurement and communications.
The OPA660AU belongs to Burr-Brown's wideband video and RF amplifier product line, engineered specifically for broadcast-grade signal fidelity, ns-scale pulse handling, and flexible current-mode analog processing in demanding analog front-ends.
FAQ
What is the function of pin 1 (IAdj) on the OPA660AU?
Pin 1 is the quiescent current programming terminal. Connecting an external resistor (RQ) from pin 1 to V– sets the total device IQ - which scales OTA transconductance, buffer slew rate, and bandwidth. A 250Ω resistor yields ~20mA IQ at 25°C, and OPA660AU performance parameters track linearly with this setting per the datasheet curves.
Can the OPA660AU be used as a standalone transconductance amplifier without the buffer section?
Yes. The OTA (pins 2, 3, 8) and buffer (pins 5, 6) are fully independent sections. The OPA660AU datasheet shows numerous OTA-only applications - including common-E amplifiers (Figure 5b), current conveyors (Figure 12), and ns-pulse integrators (Figure 17) - where the buffer remains unconnected and draws negligible current.
What is the maximum safe output current for the OPA660AU buffer section?
The OPA660AU buffer output is not internally current-limited. While it can deliver ±15mA continuously into resistive loads, short-circuit currents may reach 60mA. Burr-Brown explicitly warns against sustained shorts to ground; momentary (<2s) shorts are unlikely to cause damage, but OPA660AU reliability requires external current limiting for fault protection.
How does the OPA660AU achieve 0.06% differential gain error at 3.58MHz?
This performance stems from the OPA660AU's bipolar process design, optimized layout minimizing parasitic capacitance, and inherent linearity of its self-biased OTA core. At IQ=20mA, the combination of 850MHz bandwidth, low output impedance (7Ω), and matched internal transistor pairs ensures minimal amplitude-dependent phase/gain shift - verified across production units per the datasheet's typical performance curves.
Is the OPA660AU pin-compatible with other Burr-Brown SO-8 wideband amplifiers like the OPA690?
No. The OPA660AU has a unique pinout optimized for its dual OTA/buffer architecture (e.g., pin 1 = IAdj, pins 2/3/8 = OTA E/B/C). The OPA690 is a single high-speed op amp with standard inverting/non-inverting input and output pin assignments. Interchanging them would result in incorrect biasing, no functionality, or device damage.
OPA660AU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Transconductance
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3000V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 850 MHz
- Current - Input Bias:
- 2.1 µA
- Voltage - Input Offset:
- 10 mV
- Current - Supply:
- 26mA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA660AU FAQ
1.How can I place an order for OPA660AU through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA660AU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA660AU reliable?
The price and inventory of OPA660AU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA660AU is usually 5 days.
3.What payment methods are accepted for OPA660AU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA660AU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA660AU?
OPA660AU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA660AU order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA660AU?
For technical support, including OPA660AU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA660AU requirements.
6.How does Aetrix verify that OPA660AU is sourced from the original manufacturer or authorized distributors?
All OPA660AU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA660AU meets industry standards.
7.What is the process for return or replacement of OPA660AU?
All OPA660AU units undergo pre-shipment inspection (PSI). If there is an issue with OPA660AU, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA660AU part is unused and in its original packaging.
Return procedure for OPA660AU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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