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Texas Instruments OPA1679QRUMRQ1
- Part No.:
- OPA1679QRUMRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
OPA1679QRUMRQ1.pdf
- Description:
- IC AUDIO 4 CIRCUIT 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,656
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Product details
Overview
OPA1679QRUMRQ1 from Texas Instruments is a quad-channel, AEC-Q100 Grade 1 automotive operational amplifier designed for high-fidelity audio signal conditioning in demanding vehicle environments. It delivers 4.5 nV/√Hz input voltage noise density, 0.0001% THD+N at 1 kHz, and rail-to-rail output swing within 800 mV of supply rails into 2 kΩ - enabling low-noise preamplification and active filtering in telematics control units and eCall systems.
For engineers reviewing the OPA1679QRUMRQ1 datasheet, OPA1679QRUMRQ1 pinout, OPA1679QRUMRQ1 application, or OPA1679QRUMRQ1 equivalent, this page provides verified electrical specifications, QFN-16 pin mapping, automotive-grade thermal and EMI performance data, and validated alternative options for audio front-end design.
Technical Context
The OPA1679QRUMRQ1 implements a folded-cascode input stage with Class AB rail-to-rail output topology, achieving unity-gain stability across ±2.25 V to ±18 V supplies. Its internal phase-reversal protection prevents output inversion during common-mode overdrive, while EMI rejection ratio (EMIRR IN+) reaches 64 dB at 2.4 GHz - critical for infotainment systems operating near Bluetooth and Wi-Fi bands.
It supports wide-bandwidth operation (16 MHz GBW, 9 V/µs slew rate) with low quiescent current (2 mA per channel), enabling high-dynamic-range signal paths without thermal compromise in compact automotive modules. Channel separation exceeds –130 dB at 1 kHz, ensuring crosstalk-free multi-channel audio routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.0001% at 1 kHz, 3 VRMS output - preserves harmonic integrity in high-resolution audio playback and recording. |
| Input Voltage Noise | 4.5 nV/√Hz at 1 kHz - enables low-noise microphone preamp and sensor signal conditioning without gain-induced noise amplification. |
| Gain-Bandwidth Product | 16 MHz at G = 1 - supports stable unity-gain buffers and wideband active filters up to ~1.4 MHz full-power bandwidth. |
| Rail-to-Rail Output | Swings to within 800 mV of V+ and V– into 2 kΩ - maximizes dynamic range and headroom in single-supply or asymmetric dual-supply configurations. |
| Supply Range | ±2.25 V to ±18 V (or 4.5 V to 36 V) - accommodates diverse automotive power architectures including battery-sensed 12 V, 24 V, and isolated DC/DC rails. |
| EMIRR IN+ | 64 dB at 2.4 GHz - suppresses RF rectification-induced offset drift in Bluetooth/Wi-Fi coexistence scenarios. |
| Quiescent Current | 2 mA per channel - allows four-channel operation at < 8 mA total, reducing thermal load in sealed head unit enclosures. |
| Temperature Range | –40°C to +125°C ambient - qualified for engine bay–adjacent placement and under-dash mounting per AEC-Q100 Grade 1. |
Pinout & Package
OPA1679QRUMRQ1 is housed in a 4.00 mm × 4.00 mm, 16-pin QFN package (RUM) with exposed thermal pad for enhanced PCB heat dissipation. The package supports automated optical inspection and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN A) | Inverting input, channel A | Accepts feedback network for inverting gain stages; referenced to VCM range of (V–)+0.6 V to (V+)–2 V. |
| 2 (+IN A) | Noninverting input, channel A | Primary signal entry for buffer or noninverting amplifier; protected against phase reversal beyond CM limits. |
| 3 (V+) | Positive power supply | Highest potential rail; must be decoupled with 0.1 µF + 10 µF capacitors close to pin for EMI suppression. |
| 4 (+IN B) | Noninverting input, channel B | Independent input for second audio channel; electrically isolated from channel A with >–130 dB separation at 1 kHz. |
| 5 (–IN B) | Inverting input, channel B | Supports differential input configuration with matched layout to pins 1/2 for common-mode rejection. |
| 6 (OUT B) | Output, channel B | Capable of driving ≥2 kΩ loads; stable with ≤100 pF capacitive load without external compensation. |
| 7 (OUT C) | Output, channel C | Third independent output; shares same rail-to-rail swing and slew rate (9 V/µs) as other channels. |
| 8 (–IN C) | Inverting input, channel C | Enables cascaded gain stages; input bias current ≤10 pA minimizes DC error in high-impedance sensor interfaces. |
| 9 (+IN C) | Noninverting input, channel C | Supports active noise cancellation reference path; benefits from 114 dB open-loop gain for precise error correction. |
| 10 (V–) | Negative power supply | Lowest potential rail; connects to exposed thermal pad for junction-to-board thermal resistance of 17.4 °C/W. |
| 11 (+IN D) | Noninverting input, channel D | Fourth channel input; identical AC/DC specs to channels A–C, enabling quad-channel line drivers or mixer summing nodes. |
| 12 (–IN D) | Inverting input, channel D | Permits balanced input termination; common-mode rejection ratio (CMRR) ≥100 dB ensures immunity to ground-bounce noise. |
| 14 (OUT D) | Output, channel D | Delivers full 16 MHz bandwidth in unity-gain mode; optimized for low-distortion headphone driver or ADC input buffer. |
| 15 (OUT A) | Output, channel A | First output channel; exhibits <1 µs overload recovery time - critical for transient-rich automotive audio signals. |
| 13, 16 (NC) | No connect | Unbonded die pads; must remain unconnected on PCB to avoid parasitic coupling or thermal impedance degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Phase-reversal protection | Prevents output inversion when inputs exceed common-mode range - eliminates latch-up risk in noninverting microphone preamps during ESD transients. |
| EMI rejection ratio (EMIRR IN+) | 64 dB at 2.4 GHz - maintains DC accuracy in Bluetooth 2.4 GHz ISM band environments without external RF filtering. |
| Rail-to-rail output swing | Within 800 mV of V+ and V– into 2 kΩ - increases usable signal swing by ≥1.6 Vpp vs legacy op amps in 5 V single-supply systems. |
| Unity-gain stability | Stable with capacitive loads ≤100 pF - simplifies PCB layout for long trace runs to remote speakers or sensors without compensation networks. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation - enables direct integration into automotive head units without derating or heatsinking. |
| Low input bias current | 10 pA typical - reduces voltage error in high-Z piezoelectric sensor interfaces and passive filter networks. |
Applications
| Telematics Control Unit | Emergency Call (eCall) |
|---|---|
Use Scenario: Signal conditioning for GPS/GLONASS antenna LNA outputs and cellular modem baseband audio paths in integrated TCU modules. IC Role / Device Role / Timing Role: Quad-channel low-noise buffer and level-shifter, preserving SNR across RF and digital domains while rejecting GSM burst noise. Use Value: 4.5 nV/√Hz noise floor and 64 dB EMIRR at 900 MHz prevent RF desense and maintain call clarity during simultaneous GPS/cellular operation. | Use Scenario: Analog front-end for crash sensor-triggered voice recording and hands-free speakerphone in emergency response systems. IC Role / Device Role / Timing Role: Four-channel microphone preamplifier and speaker driver with fast overload recovery (<1 µs) for impact-transient capture. Use Value: 0.0001% THD+N and rail-to-rail output ensure intelligible voice transmission over narrowband cellular networks without harmonic distortion artifacts. |
| Automotive Active Noise Cancellation | Automotive External Amplifier |
Use Scenario: Real-time error signal generation in cabin-wide ANC systems using multiple reference microphones and speaker feedback paths. IC Role / Device Role / Timing Role: Quad-channel adaptive filter node with 16 MHz GBW and 114 dB open-loop gain for precise anti-noise waveform synthesis. Use Value: >–130 dB channel separation prevents crosstalk between reference and error channels, maintaining phase coherence across all four channels. | Use Scenario: Line driver and tone control stage in Class D amplifier input stage for premium audio systems with multi-zone output. IC Role / Device Role / Timing Role: High-fidelity signal distribution hub with independent gain control per channel before digital signal processing. Use Value: 2 mA per channel quiescent current enables always-on audio readiness without compromising vehicle battery life during extended parking modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1678QRGTRQ1 | Dual-channel variant in SOIC-8; identical electrical specs but fewer channels and larger footprint. | Suitable for space-constrained dual-path designs (e.g., stereo-only head units), not quad-channel ANC or TCU systems. | Select when only two channels are required and QFN thermal performance is not critical. |
| LM4562MA/NOPB | Non-automotive grade; higher 2.7 nV/√Hz noise but no AEC-Q100 qualification or EMIRR spec. | Limited to non-safety-critical aftermarket audio; lacks temperature range and ESD robustness for OEM deployment. | Use only in cost-sensitive, non-automotive applications where Grade 1 reliability is not mandated. |
Compared with OPA1679QRUMRQ1, the dual-channel OPA1678QRGTRQ1 reduces channel count and thermal efficiency but retains identical audio fidelity, while LM4562MA/NOPB trades automotive qualification and EMI immunity for marginally lower noise - making OPA1679QRUMRQ1 the sole choice for production-grade quad-channel automotive audio.
Availability
OPA1679QRUMRQ1 is available at Aetrix Electronics and suitable for telematics control units, emergency call (eCall) systems, and automotive active noise cancellation requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for OPA1679QRUMRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade signal chain solutions.
The OPA167x-Q1 product line was engineered specifically for high-fidelity, low-noise audio signal conditioning in AEC-Q100-compliant automotive systems - targeting telematics, infotainment, and safety-critical voice communication subsystems.
FAQ
What is the maximum capacitive load the OPA1679QRUMRQ1 can drive without instability?
The OPA1679QRUMRQ1 is stable driving capacitive loads up to 100 pF in unity-gain configuration, as confirmed in TI's SBOS922 datasheet Figure 25 and 26. This eliminates need for external isolation resistors in typical PCB trace and cable driver applications. Exceeding 100 pF may reduce phase margin below 45°, risking ringing or oscillation - verify stability with actual layout parasitics using SPICE simulation with OPA1679QRUMRQ1 macromodels.
Does the OPA1679QRUMRQ1 support single-supply operation?
Yes, the OPA1679QRUMRQ1 operates from a single supply of 4.5 V to 36 V, per Recommended Operating Conditions in Section 6.3 of SBOS922. Its rail-to-rail output and input common-mode range extending to (V–)+0.6 V enable true single-supply audio buffering and amplification - for example, 5 V or 12 V systems without negative rails - while maintaining 0.0001% THD+N performance.
How does the OPA1679QRUMRQ1 handle input overvoltage conditions?
The OPA1679QRUMRQ1 features internal phase-reversal protection that clamps output to the nearest rail instead of inverting during common-mode overdrive, as shown in Figure 31 of SBOS922. Input pins include ESD protection diodes rated to ±2000 V HBM, and absolute maximum input voltage is (V–)–0.5 V to (V+)+0.5 V - exceeding this risks permanent damage, so external clamping is recommended for >10 mA fault currents.
What is the thermal performance of the OPA1679QRUMRQ1 in its QFN-16 package?
The OPA1679QRUMRQ1 in RUM (QFN-16) package has a junction-to-ambient thermal resistance (RθJA) of 38.5 °C/W and junction-to-board (RθJB) of 17.4 °C/W, per Section 6.4 of SBOS922. With its exposed thermal pad soldered to ≥1 cm² copper pour, it sustains continuous 2 mA/channel operation at +125°C ambient - critical for under-dash head unit placement where airflow is restricted.
Is the OPA1679QRUMRQ1 pin-compatible with other devices in the OPA167x-Q1 family?
No - the OPA1679QRUMRQ1 (quad, QFN-16) is not pin-compatible with the dual-channel OPA1678-Q1 (SOIC-8 or QFN-10). Pin functions and counts differ fundamentally: OPA1679QRUMRQ1 uses 16 pins with four fully independent channels and dedicated V+/V– rails, whereas OPA1678-Q1 uses 8 or 10 pins for two channels. Board redesign is required when substituting between these variants.
OPA1679QRUMRQ1 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:
- 20 kHz
- 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (4x4)
OPA1679QRUMRQ1 FAQ
1.How can I place an order for OPA1679QRUMRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1679QRUMRQ1 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 OPA1679QRUMRQ1 reliable?
The price and inventory of OPA1679QRUMRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1679QRUMRQ1 is usually 5 days.
3.What payment methods are accepted for OPA1679QRUMRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1679QRUMRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1679QRUMRQ1?
OPA1679QRUMRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1679QRUMRQ1 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 OPA1679QRUMRQ1?
For technical support, including OPA1679QRUMRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1679QRUMRQ1 requirements.
6.How does Aetrix verify that OPA1679QRUMRQ1 is sourced from the original manufacturer or authorized distributors?
All OPA1679QRUMRQ1 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 OPA1679QRUMRQ1 meets industry standards.
7.What is the process for return or replacement of OPA1679QRUMRQ1?
All OPA1679QRUMRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with OPA1679QRUMRQ1, 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 OPA1679QRUMRQ1 part is unused and in its original packaging.
Return procedure for OPA1679QRUMRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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