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Texas Instruments OPA1679IRUMR
- Part No.:
- OPA1679IRUMR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
OPA1679IRUMR.pdf
- Description:
- IC AUDIO 4 CIRCUIT 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,858
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Product details
Overview
OPA1679IRUMR from Texas Instruments is a quad-channel, rail-to-rail output audio operational amplifier optimized for high-fidelity signal conditioning in professional and automotive audio systems. It delivers 4.5 nV/√Hz input voltage noise at 1 kHz, 0.0001% THD+N at 1 kHz with 2-kΩ load, and 16 MHz unity-gain bandwidth - enabling low-noise preamplification, line-driver, and active filter stages in A/V receivers and external amplifiers.
For engineers reviewing the OPA1679IRUMR datasheet, OPA1679IRUMR pinout, OPA1679IRUMR application, or OPA1679IRUMR equivalent, this device is selected where simultaneous channel isolation (>130 dB at 1 kHz), wide supply range (±2.25 V to ±18 V), and stable operation into capacitive loads up to 100 pF are required without sacrificing dynamic range or harmonic purity.
Technical Context
The OPA1679IRUMR employs a folded-cascode input stage paired with a Class AB rail-to-rail output stage, delivering low distortion across its full operating supply range. Its fully independent per-channel internal circuitry eliminates crosstalk-induced intermodulation, critical in multi-channel mixer and control surface designs.
Phase-reversal protection prevents output inversion during common-mode overdrive, while ESD-rated inputs (±2000 V HBM) and robust electrical overstress handling support reliable deployment in production audio hardware. The device maintains stability under varying load conditions without requiring external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise density | 4.5 nV/√Hz at 1 kHz - enables microphone preamp gain stages with <–110 dBu input-referred noise floor |
| THD+N | 0.0001% at 1 kHz, 3 VRMS, 2-kΩ load - preserves transient integrity and harmonic accuracy in mastering-grade paths |
| Gain bandwidth | 16 MHz (G = 1) - supports wideband active filters and ultrasonic-capable line drivers up to 100 kHz |
| Slew rate | 9 V/µs - ensures faithful reproduction of fast transients (e.g., drum hits, plucked strings) without slew-induced distortion |
| Supply range | ±2.25 V to ±18 V (or 4.5 V to 36 V) - accommodates battery-powered portable gear and high-voltage studio equipment |
| Quiescent current | 2 mA per channel - allows four-channel operation at <8 mA total, suitable for thermally constrained PCB layouts |
| Channel separation | –130 dB at 1 kHz - prevents bleed between left/right or front/rear channels in quad-mixer architectures |
Pinout & Package
OPA1679IRUMR is housed in a 16-pin QFN package (RUM) with exposed thermal pad, measuring 3 mm × 3 mm × 0.8 mm. The thermal pad must be soldered to a V–-connected copper plane for specified thermal performance (RθJA = 38.5°C/W) and maximum output swing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6, 7, 14 | OUT A/B/C/D | Amplified outputs for each of four independent channels; rail-to-rail swing within 800 mV of rails into 2-kΩ |
| 2, 5, 8, 12 | –IN A/B/C/D | Inverting inputs; high-impedance (6 GΩ || 2 pF common-mode) for precision feedback network design |
| 3, 4, 9, 11 | +IN A/B/C/D | Noninverting inputs; matched bias current (±10 pA typ.) enables DC-coupled sensor interfaces |
| 10 | V– | Negative supply rail; thermal pad must be connected here to dissipate heat and maintain SOA |
| 3 | V+ | Positive supply rail; supports asymmetric supplies (e.g., +15 V / –5 V) for single-supply system integration |
| 13, 16 | NC | No-connect pins; must remain unconnected to avoid parasitic coupling or mechanical stress on die |
Key Features
| Feature | Design Value |
|---|---|
| Phase-reversal protection | Prevents output inversion when input exceeds common-mode range (V– + 0.5 V to V+ – 2 V), eliminating latch-up risk in noninverting configurations |
| Rail-to-rail output | Swings to within 800 mV of either rail into 2-kΩ, maximizing dynamic range in ±15 V or 36 V single-supply systems |
| Independent channel architecture | Zero shared bias or signal paths between channels - ensures >130 dB isolation even under overload or clipping |
| Capacitive load drive | Stable with up to 100 pF directly at output - simplifies PCB layout by eliminating series-R compensation in headphone driver stages |
| ESD robustness | ±2000 V HBM rating - withstands handling and board-level assembly without additional protection circuitry |
Applications
| Professional Audio Mixer | Guitar Amplifier Effects Loop |
|---|---|
Use Scenario: Summing and buffering discrete channel signals in analog control surfaces with 16+ inputs. IC Role / Device Role / Timing Role: Quad-channel OPA1679IRUMR serves as four independent line-level buffer stages, one per stereo pair or subgroup bus. Use Value: 130 dB channel separation prevents crosstalk-induced imaging collapse; rail-to-rail swing preserves headroom across ±15 V supply rails. |
Use Scenario: Signal conditioning in buffered effects loops of tube-driven guitar amplifiers. IC Role / Device Role / Timing Role: OPA1679IRUMR provides unity-gain buffering before/after time-based effects (delay, reverb) to prevent tone-sucking. Use Value: 4.5 nV/√Hz noise floor avoids hiss amplification; 9 V/µs slew rate preserves pick attack transients without softening. |
| A/V Receiver Preamp Stage | Automotive External Amplifier Input Stage |
Use Scenario: Low-noise amplification of HDMI audio return channel (ARC) and optical TOSLINK signals before DAC conversion. IC Role / Device Role / Timing Role: One OPA1679IRUMR handles four differential input pairs (L/R front, L/R surround) in balanced line-receiver configuration. Use Value: 0.0001% THD+N ensures bit-perfect analog reconstruction; 16 MHz GBW supports full 20 Hz–20 kHz bandwidth with margin. |
Use Scenario: Input conditioning for Class D amplifier modules in vehicle cabin audio systems with variable battery voltage (9–16 V). IC Role / Device Role / Timing Role: OPA1679IRUMR operates from single 12 V supply, providing DC-coupled, low-impedance drive to amplifier inputs. Use Value: Wide 4.5–36 V supply range accommodates cold-crank (6.5 V) and load-dump (30 V) events without shutdown or distortion spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AIDR | Dual-channel only; lower noise (1.1 nV/√Hz) but higher quiescent current (4.5 mA/ch); no phase-reversal protection | Better suited for ultra-low-noise mic preamps where channel count is secondary; not drop-in for quad-channel layouts | Select OPA1612AIDR only when dual-channel topology and sub-2 nV/√Hz noise outweigh need for integrated quad solution and phase safety |
| LM4562MAX | Quad-channel; higher THD+N (0.00003% typ. but 0.0002% max); wider supply (±2.5 V to ±17 V); no thermal pad in SOIC-14 | Preferred in cost-sensitive consumer A/V receivers; lacks QFN thermal performance for sustained high-output loads | Choose LM4562MAX for legacy SOIC-14 footprint compatibility and tighter THD+N distribution, but verify thermal derating at >100 mW/channel |
Compared with OPA1679IRUMR, OPA1612AIDR offers superior noise but requires two packages for quad functionality and lacks built-in phase reversal immunity, while LM4562MAX matches channel count but trades thermal efficiency and absolute distortion ceiling for broader manufacturing availability.
Availability
OPA1679IRUMR is available at Aetrix Electronics and suitable for professional audio mixer/control surface, guitar amplifier effects loop, A/V receiver preamp stage, and automotive external amplifier applications requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.
Supply support for OPA1679IRUMR 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 leadership in high-performance audio signal chain components.
The OPA167x family was engineered specifically for professional and high-end consumer audio systems demanding ultra-low noise, near-zero distortion, and robust multi-channel isolation - targeting applications where legacy op amps introduce audible artifacts or channel interaction.
FAQ
What is the maximum capacitive load the OPA1679IRUMR can drive stably?
The OPA1679IRUMR is characterized for stable operation with up to 100 pF of capacitive load at unity gain, as confirmed in Figure 6-25 of the SBOS855E datasheet. This eliminates the need for series output resistors in many headphone driver and cable-driving applications, though layout-dependent parasitics should still be minimized to preserve phase margin.
Does the OPA1679IRUMR require external power-supply decoupling capacitors?
Yes - the OPA1679IRUMR requires local 100 nF ceramic decoupling capacitors placed as close as possible to pins 3 (V+) and 10 (V–), per Section 8.3 of the datasheet. Additional bulk capacitance (e.g., 10 µF tantalum) is recommended on the supply rail to suppress low-frequency ripple in multi-channel audio systems.
Can the OPA1679IRUMR operate from a single 5-V supply?
Yes - the OPA1679IRUMR supports single-supply operation from 4.5 V to 36 V, including 5 V. At 5 V, it delivers rail-to-rail output swing within 800 mV of each rail into 2 kΩ, with THD+N remaining at 0.0001% at 1 kHz and 1 VRMS output, as verified in the Recommended Operating Conditions table (Section 6.3).
What is the function of the NC pins (13 and 16) on the OPA1679IRUMR RUM package?
Pins 13 and 16 on the OPA1679IRUMR are designated No Connect (NC) and must remain unconnected. They serve no electrical function and are included for mechanical symmetry and package manufacturability. Soldering or routing to these pins may induce parasitic coupling or compromise thermal pad solder joint integrity.
How does the thermal pad on the OPA1679IRUMR package affect performance?
The exposed thermal pad on the OPA1679IRUMR (RUM package) must be soldered to a V–-connected copper pour to achieve the specified RθJA of 38.5°C/W. Without proper thermal pad connection, junction temperature rises significantly - degrading THD+N, increasing offset drift, and risking thermal shutdown under sustained 100-mA output conditions.
OPA1679IRUMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 9V/µs
- Gain Bandwidth Product:
- 16 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 2mA (x4 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (4x4)
OPA1679IRUMR FAQ
1.How can I place an order for OPA1679IRUMR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1679IRUMR 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 OPA1679IRUMR reliable?
The price and inventory of OPA1679IRUMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1679IRUMR is usually 5 days.
3.What payment methods are accepted for OPA1679IRUMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1679IRUMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1679IRUMR?
OPA1679IRUMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1679IRUMR 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 OPA1679IRUMR?
For technical support, including OPA1679IRUMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1679IRUMR requirements.
6.How does Aetrix verify that OPA1679IRUMR is sourced from the original manufacturer or authorized distributors?
All OPA1679IRUMR 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 OPA1679IRUMR meets industry standards.
7.What is the process for return or replacement of OPA1679IRUMR?
All OPA1679IRUMR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1679IRUMR, 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 OPA1679IRUMR part is unused and in its original packaging.
Return procedure for OPA1679IRUMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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