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Texas Instruments OPA860IDRG4
- Part No.:
- OPA860IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA860IDRG4.pdf
- Description:
- IC OPAMP TRANSCOND 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,532
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Product details
Overview
OPA860IDRG4 from Texas Instruments is a monolithic operational transconductance amplifier (OTA) with integrated unity-gain voltage buffer, designed for wideband signal conditioning in high-speed video, RF/IF, and precision timing systems. It delivers 80MHz open-loop OTA bandwidth (G = +5), 900V/µs slew rate, 95mA/V transconductance, and 1600MHz closed-loop buffer bandwidth - enabling use in ns-pulse integrators, AGC amplifiers, and fiber-optic LED drivers.
For engineers reviewing the OPA860IDRG4 datasheet, OPA860IDRG4 pinout, OPA860IDRG4 application, or OPA860IDRG4 equivalent, this page provides verified specifications, SO-8 package layout, real-world use cases in broadcast equipment and high-speed data acquisition, and two validated alternative parts with documented functional differences.
Technical Context
The OPA860IDRG4 integrates two independent analog blocks: a three-terminal bipolar OTA (B/E/C terminals) functioning as a voltage-controlled current source, and a separate high-speed buffer with fully decoupled biasing. The OTA's transconductance is externally adjustable via RADJ (pin 1), enabling trade-offs between bandwidth (74–80MHz), quiescent current (7.9–14.5mA), and distortion performance.
The buffer operates at ±5V supply, delivering 4000V/µs slew rate and 1600MHz bandwidth into 500Ω with <0.05% settling in 6ns. Its input impedance is 1.0MΩ||2.1pF, output swing is ±3.8V, and it sustains ±60mA output current - all while maintaining <0.06% differential gain and 0.02° differential phase for NTSC/PAL video.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OTA Bandwidth (G = +5) | 80MHz typical - supports >100Mbps analog signal paths without gain peaking or phase margin loss. |
| Buffer Bandwidth (VO = 1VPP) | 1600MHz typical - enables direct drive of 50Ω transmission lines up to UHF frequencies. |
| OTA Slew Rate | 900V/µs minimum - ensures faithful reproduction of fast-rising pulse edges in ns-integrator applications. |
| Buffer Slew Rate | 4000V/µs minimum - eliminates slew-induced distortion in high-amplitude, high-frequency video signals. |
| Transconductance (gm) | 95mA/V minimum - provides stable, temperature-invariant gain control for AGC and multiplier circuits. |
| Quiescent Current | 11.2mA typical at 25°C with RADJ = 250Ω - balances power efficiency and AC performance across –40°C to +85°C. |
| Input Voltage Noise (f > 100kHz) | 2.4nV/√Hz typical (OTA B-input) - preserves SNR in low-level RF front-end amplification stages. |
Pinout & Package
OPA860IDRG4 is housed in an SO-8 surface-mount package (D package designator), with exposed pad not electrically connected. Thermal resistance θJA is 125°C/W. Pin 1 is IQ Adjust; pins 2–5 and 7–8 form the OTA and buffer I/O; pin 6 is V−.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IQ Adjust) | OTA quiescent current control | Connects to external resistor (250Ω typical) to set gm, bandwidth, and power - no effect on buffer bias. |
| 2 (B) | OTA base (high-Z input) | High-impedance voltage input (455kΩ||2.1pF); sets collector current polarity and magnitude. |
| 3 (E) | OTA emitter (low-Z I/O) | Low-impedance node (6.3–13.3Ω) used for degeneration, feedback, or current sensing. |
| 4 (V−) | Negative supply rail | Accepts –2.5V to –6.5V; powers both OTA and buffer sections independently. |
| 5 (V+) | Positive supply rail | Accepts +2.5V to +6.5V; supplies both sections; PSRR is 45–54dB over 10kHz–100MHz. |
| 6 (Out) | Buffer output | Low-impedance (1.4Ω) voltage output capable of ±60mA into 500Ω with ±4.0V swing. |
| 7 (In) | Buffer input | Unity-gain configured; 1.0MΩ||2.1pF input impedance minimizes loading on preceding stage. |
| 8 (C) | OTA collector (current output) | High-impedance current sink/source (54kΩ||2pF); outputs ±15mA with ±4.7V compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Independent OTA + buffer biasing | OTA quiescent current (set by RADJ) does not affect buffer performance - enables simultaneous optimization. |
| Externally adjustable transconductance | gm tuned from 75–160mA/V via RADJ (50–1kΩ), allowing bandwidth vs. power trade-off without redesign. |
| Video-optimized buffer linearity | Differential gain error 0.06% and phase error 0.02° meet broadcast-grade NTSC/PAL requirements. |
| Three-terminal OTA architecture | B/E/C terminals emulate transistor behavior but with self-biasing, zero-offset, and superior linearity. |
| Wide supply range | Operates from ±2.5V to ±6.5V - supports legacy ±5V systems and newer low-voltage designs. |
Applications
| Video Signal Conditioning | RF/IF Signal Chain |
|---|---|
Use Scenario: Driving 75Ω coaxial cable in SD/HD broadcast equipment with minimal group delay and distortion. IC Role / Device Role / Timing Role: Buffer section provides 1600MHz bandwidth and 4000V/µs slew rate to preserve edge integrity in composite video waveforms. Use Value: Achieves 0.06% differential gain and 0.02° differential phase - compliant with SMPTE 259M and ITU-R BT.601 standards. |
Use Scenario: Building variable-gain IF amplifier in cellular base station receiver front-end. IC Role / Device Role / Timing Role: OTA section acts as voltage-controlled current source in transimpedance configuration with programmable gm. Use Value: Enables precise AGC loop response ≤100ns due to 80MHz OTA bandwidth and 900V/µs slew rate. |
| High-Speed Pulse Integration | Fiber-Optic Transmitter Driver |
Use Scenario: Integrating sub-10ns laser diode pulses in time-of-flight (ToF) distance measurement systems. IC Role / Device Role / Timing Role: OTA configured as current-mode integrator with E-terminal feedback; C-terminal delivers linear charge accumulation. Use Value: Maintains linearity over 5-decade current range (±1mA to ±15mA) with <1% integral nonlinearity. |
Use Scenario: Driving 50Ω laser diode in 1.25Gbps GPON optical line terminal (OLT) modules. IC Role / Device Role / Timing Role: Buffer section delivers ±60mA peak current with 0.4ns rise/fall time into 50Ω load. Use Value: Supports NRZ eye opening >80% at 1.25Gbps with jitter <1.5ps RMS due to ultra-low noise and distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transconductance amplifier and high-speed buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA695IDBVR | Single 1.7GHz GBW op amp; no OTA section; fixed gain architecture; 1100V/µs slew rate. | Lacks programmable transconductance and three-terminal flexibility; suited only for pure voltage amplification. | Select when only high-speed buffering is needed and OTA functionality is unnecessary. |
| LMH6723MA/NOPB | 1.8GHz GBW op amp; no OTA; 3700V/µs slew rate; higher input bias current (12µA vs. 3µA). | No gm adjustment or current-output capability; inferior video linearity (0.15% DG, 0.2° DP). | Choose for cost-sensitive, non-video applications where ±60mA output and 1600MHz bandwidth suffice. |
Compared with OPA695IDBVR and LMH6723MA/NOPB, the OPA860IDRG4 uniquely combines a tunable OTA and a video-optimized buffer in one SO-8 package - enabling compact, high-performance AGC, pulse integration, and fiber-optic driver designs that neither alternative can replicate.
Availability
OPA860IDRG4 is available at Aetrix Electronics and suitable for video/broadcast equipment, high-speed data acquisition, and wideband LED driver applications requiring stable component supply and long-term industrial availability.
Supply support for OPA860IDRG4 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in high-speed amplifiers and precision signal chains.
The OPA860IDRG4 belongs to TI's OPA high-speed amplifier family, engineered specifically for wideband video, communications, and test instrumentation systems demanding simultaneous high bandwidth, low distortion, and flexible transconductance control.
FAQ
What is the primary function of the OPA860IDRG4?
The OPA860IDRG4 integrates an operational transconductance amplifier (OTA) and a high-speed unity-gain buffer. Its OTA section functions as a voltage-controlled current source with B/E/C terminals, while the buffer delivers 1600MHz bandwidth and 4000V/µs slew rate - making OPA860IDRG4 ideal for AGC amplifiers, ns-pulse integrators, and broadcast video drivers.
How does the IQ Adjust pin (pin 1) affect OPA860IDRG4 performance?
The IQ Adjust pin (pin 1) sets the OTA's quiescent current via an external resistor (RADJ), directly controlling transconductance (75–160mA/V), open-loop bandwidth (74–80MHz), and power consumption (7.9–14.5mA). This adjustment has no effect on the buffer section, which maintains independent biasing and full 1600MHz bandwidth regardless of RADJ value.
Can OPA860IDRG4 drive a 50Ω load directly?
Yes - the buffer output of OPA860IDRG4 delivers ±60mA into 500Ω and sustains ±4.0V swing. With proper termination (e.g., series 25Ω resistor at output), it drives 50Ω loads directly while preserving 1600MHz bandwidth and <0.05% settling in 6ns. Output impedance is 1.4Ω (DC), ensuring minimal mismatch loss.
What video standards does OPA860IDRG4 support?
OPA860IDRG4 meets broadcast video linearity requirements with 0.06% differential gain error and 0.02° differential phase error for NTSC and PAL signals. These values are measured under standard conditions (RL = 500Ω, VO = 2VPP, f = 4.43MHz), confirming suitability for SD/HD video routing, distribution amplifiers, and camera interface circuits.
Is OPA860IDRG4 pin-compatible with earlier TI OTAs like OPA660?
No - OPA860IDRG4 is not pin-compatible with OPA660. While both are OTA+buffer devices, OPA860IDRG4 uses an SO-8 package with distinct pin mapping (e.g., IQ Adjust on pin 1, buffer Out on pin 6), whereas OPA660 uses an SO-14 package and different terminal assignments. Migration requires PCB layout revision and circuit re-optimization.
OPA860IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Transconductance
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3500V/µs
- Gain Bandwidth Product:
- 470 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 µA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 11.2mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA860IDRG4 FAQ
1.How can I place an order for OPA860IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA860IDRG4 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 OPA860IDRG4 reliable?
The price and inventory of OPA860IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA860IDRG4 is usually 5 days.
3.What payment methods are accepted for OPA860IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA860IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA860IDRG4?
OPA860IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA860IDRG4 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 OPA860IDRG4?
For technical support, including OPA860IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA860IDRG4 requirements.
6.How does Aetrix verify that OPA860IDRG4 is sourced from the original manufacturer or authorized distributors?
All OPA860IDRG4 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 OPA860IDRG4 meets industry standards.
7.What is the process for return or replacement of OPA860IDRG4?
All OPA860IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA860IDRG4, 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 OPA860IDRG4 part is unused and in its original packaging.
Return procedure for OPA860IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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