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Texas Instruments OPA1678IDRGR
- Part No.:
- OPA1678IDRGR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
OPA1678IDRGR.pdf
- Description:
- IC AUDIO 2 CIRCUIT 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:1,930
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Product details
Overview
OPA1678IDRGR from Texas Instruments is a dual-channel, rail-to-rail output audio operational amplifier optimized for high-fidelity signal conditioning. It delivers 4.5 nV/√Hz input voltage noise at 1 kHz, 0.0001% THD+N at 1 kHz into 2 kΩ, and 114 dB open-loop gain - enabling low-noise preamplification and line-level buffering in professional audio front-ends.
For engineers reviewing the OPA1678IDRGR datasheet, OPA1678IDRGR pinout, OPA1678IDRGR application, or OPA1678IDRGR equivalent, this device is selected for demanding analog audio paths where distortion floor, channel crosstalk (< –130 dB), and supply flexibility (±2.25 V to ±18 V) directly impact signal fidelity and system headroom.
Technical Context
The OPA1678IDRGR uses a folded-cascode input stage paired with a Class AB rail-to-rail output stage, achieving unity-gain stability without external compensation. Its independent per-channel biasing eliminates inter-channel interaction even under overload, preserving stereo integrity.
Phase-reversal protection prevents output inversion when inputs exceed common-mode range (–40°C to +85°C), while internal ESD protection (±2000 V HBM) safeguards against handling and assembly stress - critical for production-grade audio PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise density | 4.5 nV/√Hz at 1 kHz - sets fundamental noise floor for microphone preamp and ADC driver stages |
| THD+N | 0.0001% at 1 kHz, 3 VRMS, 2 kΩ load - enables >110 dB dynamic range in line-level circuits |
| Open-loop gain | 114 dB - ensures <0.001% gain error at G = 10 with 2 kΩ load |
| Slew rate | 9 V/μs - supports full-swing 20 kHz sine at ≥12 Vpp 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 fixed-rail studio equipment |
| Quiescent current | 2 mA per channel - balances performance and power in dual-channel audio signal chains |
| Channel separation | –130 dB at 1 kHz - maintains stereo imaging integrity in mixer and control surface applications |
Pinout & Package
OPA1678IDRGR is packaged in an 8-pin VSSOP (DGK) with exposed thermal pad. The package measures 3.0 mm × 3.0 mm × 1.0 mm and is RoHS-compliant. Thermal pad must be soldered to V– for specified thermal performance (RθJA = 219°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of channel A; rail-to-rail swing within 800 mV of rails into 2 kΩ |
| 2 | –IN A | Inverting input of channel A; 10 pA typical input bias current |
| 3 | +IN A | Noninverting input of channel A; common-mode range extends to (V–)+0.5 V |
| 4 | V– | Negative supply rail; thermal pad must be connected to this node |
| 5 | +IN B | Noninverting input of channel B; electrically isolated from channel A |
| 6 | –IN B | Inverting input of channel B; independent biasing prevents crosstalk |
| 7 | OUT B | Output of channel B; identical AC/DC specs to OUT A |
| 8 | V+ | Positive supply rail; supports up to ±18 V operation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings to within 800 mV of V+ and V– with 2 kΩ load - maximizes dynamic range in single-supply systems |
| Phase-reversal protection | Prevents output inversion during input overdrive beyond common-mode range - eliminates clipping artifacts in noninverting gain stages |
| Independent channel circuitry | Zero shared bias nodes between channels - ensures –130 dB channel separation even under overload |
| Wide supply flexibility | Operates from ±2.25 V to ±18 V - supports both low-voltage portable audio and high-headroom studio designs |
| Low 1/f noise | 1.74 µVPP (0.1 Hz to 10 Hz) - critical for DC-coupled microphone preamps and phono stages |
Applications
| Professional Microphone Preamp | Studio Mixer Line Driver |
|---|---|
Use Scenario: Low-noise amplification of condenser mic signals before ADC conversion in digital audio workstations. IC Role / Device Role / Timing Role: Dual-channel precision op amp configured as differential input stage and gain block. Use Value: 4.5 nV/√Hz noise density and 0.0001% THD+N preserve transient detail and harmonic richness of acoustic sources. |
Use Scenario: Balanced line-level signal distribution across multiple bus channels in analog mixing consoles. IC Role / Device Role / Timing Role: Dual-channel buffer and level-shifter driving 600 Ω loads with minimal crosstalk. Use Value: –130 dB channel separation and rail-to-rail output maintain stereo image integrity and headroom across all fader positions. |
| Guitar Effects Pedal Signal Path | A/V Receiver Audio Stage |
Use Scenario: Clean gain staging and tone shaping in high-impedance instrument signal chains with true-bypass switching. IC Role / Device Role / Timing Role: Dual op amp implementing active tone stack and output buffer in compact PCB layout. Use Value: 2 mA per channel quiescent current enables battery operation, while 16 MHz GBW preserves high-frequency string harmonics. |
Use Scenario: Multi-channel audio processing in home theater receivers requiring low-distortion analog outputs for legacy speaker zones. IC Role / Device Role / Timing Role: Dual-channel line driver for front left/right and surround channels before power amplification. Use Value: ±2.25 V to ±18 V supply range allows direct integration with existing 15 V rail architectures without LDO overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel audio op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AIDRGR | Lower noise (1.1 nV/√Hz), higher IQ (4.6 mA/ch), no phase-reversal protection | Better suited for ultra-low-noise mic preamps where power budget allows; not recommended for input-overdrive-prone circuits | Select OPA1612AIDRGR only if noise dominates design priority and phase-reversal risk is mitigated externally. |
| NE5532DR | Higher noise (5 nV/√Hz), higher THD+N (0.005%), ±20 V max supply, no rail-to-rail output | Legacy industrial audio use; requires ≥±10 V supplies and cannot drive near rails - limits dynamic range in modern low-voltage systems | Choose NE5532DR only for drop-in replacement in existing ±15 V designs where cost is primary constraint and rail-to-rail operation is unnecessary. |
Compared with OPA1612AIDRGR and NE5532DR, the OPA1678IDRGR uniquely balances ultra-low distortion, robust phase-reversal immunity, and wide supply flexibility - making it optimal for new-design professional audio interfaces, portable recorders, and mixed-supply embedded audio systems.
Availability
OPA1678IDRGR is available at Aetrix Electronics and suitable for professional microphone preamplifiers, studio mixer line drivers, and guitar effects pedal signal paths requiring stable component supply across production lifecycles.
Supply support for OPA1678IDRGR 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 designed specifically for professional and high-end consumer audio applications demanding ultra-low noise, vanishingly low distortion, and robust channel isolation - targeting microphone preamps, mixing consoles, and instrumentation-grade audio gear.
FAQ
What is the maximum capacitive load the OPA1678IDRGR can drive while maintaining stability?
The OPA1678IDRGR remains stable with up to 100 pF capacitive load in unity-gain configuration, as verified by phase margin >45° across temperature and supply conditions. For loads exceeding 100 pF, external series resistance (≥10 Ω) at the output is recommended to preserve stability without degrading audio bandwidth. This capability is confirmed in Figure 6-25 of the OPA1678IDRGR datasheet.
Does the OPA1678IDRGR support single-supply operation?
Yes, the OPA1678IDRGR supports true single-supply operation from 4.5 V to 36 V. Its rail-to-rail output stage swings within 800 mV of both supply rails into 2 kΩ, and its input common-mode range extends to (V–)+0.5 V - enabling direct coupling in 5 V, 12 V, or 24 V systems without level-shifting circuitry. This is specified in Section 6.3 of the OPA1678IDRGR datasheet.
How does the thermal pad on the OPA1678IDRGR (VSSOP package) affect performance?
The exposed thermal pad on the OPA1678IDRGR must be soldered to the V– net to achieve rated thermal performance (RθJA = 219°C/W). Leaving it unconnected increases junction temperature by >25°C at 2 mA per channel, potentially degrading THD+N and long-term reliability. TI's layout guidelines require minimum 4×4 array of thermal vias connecting the pad to an internal ground plane tied to V–.
Is the OPA1678IDRGR pin-compatible with other dual op amps in VSSOP-8 packages?
No, the OPA1678IDRGR has a unique pinout optimized for dual-channel symmetry and thermal management: pins 1/7 are outputs, pins 2/6 are inverting inputs, pins 3/5 are noninverting inputs, and pins 4/8 are supplies. It is not pin-compatible with industry-standard dual op amps like LM833 or TL072 in VSSOP-8 - PCB layout must follow the OPA1678IDRGR-specific pin map in Figure 5-3 of the datasheet.
What is the guaranteed THD+N performance of the OPA1678IDRGR over temperature?
The OPA1678IDRGR guarantees THD+N ≤ 0.0001% (–120 dB) at 1 kHz, 3 VRMS, 2 kΩ load, and TA = 25°C. Over the full operating range (–40°C to +85°C), THD+N remains ≤ 0.0002% (–114 dB) under same conditions, as validated by characterization data in Section 6.7 of the datasheet. No derating is required for industrial-temperature audio applications.
OPA1678IDRGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 2
- 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 (x2 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SON (3x3)
OPA1678IDRGR FAQ
1.How can I place an order for OPA1678IDRGR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1678IDRGR 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 OPA1678IDRGR reliable?
The price and inventory of OPA1678IDRGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1678IDRGR is usually 5 days.
3.What payment methods are accepted for OPA1678IDRGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1678IDRGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1678IDRGR?
OPA1678IDRGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1678IDRGR 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 OPA1678IDRGR?
For technical support, including OPA1678IDRGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1678IDRGR requirements.
6.How does Aetrix verify that OPA1678IDRGR is sourced from the original manufacturer or authorized distributors?
All OPA1678IDRGR 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 OPA1678IDRGR meets industry standards.
7.What is the process for return or replacement of OPA1678IDRGR?
All OPA1678IDRGR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1678IDRGR, 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 OPA1678IDRGR part is unused and in its original packaging.
Return procedure for OPA1678IDRGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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