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Texas Instruments OPA1688IDR
- Part No.:
- OPA1688IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA1688IDR.pdf
- Description:
- IC OPAMP AUDIO 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:617
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Product details
Overview
OPA1688IDR from Texas Instruments is a dual-channel, 36-V rail-to-rail output audio operational amplifier optimized for high-fidelity signal conditioning in professional audio systems. It delivers –109 dB THD+N at 1 kHz into 32 Ω, 10 MHz gain bandwidth, ±0.25 mV max input offset voltage, and 8 nV/√Hz input voltage noise density - enabling low-distortion headphone and line-level amplification in single-supply 4.5–36 V systems.
For engineers reviewing the OPA1688IDR datasheet, OPA1688IDR pinout, OPA1688IDR application, or OPA1688IDR equivalent, this page provides verified package mapping (SOIC-8), confirmed dual-channel pin functions, real-world THD+N performance across load impedances, EMI rejection data up to 5 GHz, and validated alternatives for audio-grade op amp selection.
Technical Context
The OPA1688IDR implements a three-stage amplifier topology with active feedforward gain staging to achieve simultaneous high bandwidth (10 MHz), low noise (8 nV/√Hz), and exceptional DC precision (±0.5 µV/°C drift). Its input stage operates from 100 mV below V– to within 2 V of V+, and its rail-to-rail output delivers ±75 mA short-circuit current with 8 V/µs slew rate.
Unlike conventional op amps specified at fixed supplies, the OPA1688IDR is fully characterized from ±2.25 V to ±18 V (4.5–36 V single supply), with guaranteed phase-reversal immunity and CMRR ≥104 dB across temperature (–40°C to +85°C). Input EMI filtering targets 400 MHz–5 GHz interference sources including GSM, Bluetooth®, and 802.11a/n.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4.5 V to 36 V single supply (±2.25 V to ±18 V) - supports wide-range battery and line-powered audio systems without level-shifting. |
| THD+N | –109 dB at 1 kHz, 10 mW into 32 Ω - enables transparent headphone drive with negligible harmonic corruption. |
| Gain Bandwidth | 10 MHz - sustains stable unity-gain operation with fast settling (3 µs to 0.1%) for transient-rich audio signals. |
| Input Voltage Noise | 8 nV/√Hz at 1 kHz - preserves dynamic range in low-level microphone preamp and DAC output stages. |
| Input Offset Drift | ±0.5 µV/°C - ensures <±1.6 mV total offset over –40°C to +85°C, critical for DC-coupled mixer summing nodes. |
| CMRR | 120 dB at ±18 V - rejects common-mode noise from shared power rails in multi-channel audio interfaces. |
| EMI Rejection | 114 dB at 5 GHz - suppresses Wi-Fi/5G interference in compact PCB layouts with mixed analog/digital routing. |
Pinout & Package
OPA1688IDR is supplied in an industry-standard SOIC-8 package (4.90 mm × 3.91 mm), pin-compatible with legacy dual op amps and optimized for automated assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of channel A - drives headphones, line outputs, or next-stage filters with rail-to-rail swing. |
| 2 | –IN A | Inverting input of channel A - used in inverting gain configurations or feedback networks. |
| 3 | +IN A | Noninverting input of channel A - accepts single-ended or differential input signals with full rail-to-rail common-mode range. |
| 4 | V– | Negative supply pin - connects to ground (single supply) or negative rail (dual supply); reference for all internal biasing. |
| 5 | +IN B | Noninverting input of channel B - independent input path for stereo or dual-mono signal chains. |
| 6 | –IN B | Inverting input of channel B - enables matched dual-channel feedback design without crosstalk. |
| 7 | OUT B | Output of channel B - electrically isolated from OUT A; supports independent load driving up to ±75 mA. |
| 8 | V+ | Positive supply pin - accepts up to 36 V; powers both channels with integrated thermal regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 100 mV of V+ and V– at ±1 mA load - eliminates need for level-shifting in 3.3 V or 5 V DAC interface designs. |
| EMI-filtered inputs | 114 dB rejection at 5 GHz - prevents RF rectification artifacts in wireless-enabled audio equipment without external LC filtering. |
| No phase reversal | Input tolerates overvoltage beyond rails without polarity inversion - protects downstream circuitry during power sequencing or fault conditions. |
| Low quiescent current | 1.6 mA per amplifier - enables dual-channel operation in battery-powered mixers and portable recorders with >20-hour runtime. |
| High channel separation | –120 dB at 1 kHz - maintains stereo imaging integrity in professional control surfaces and DJ gear with dense channel counts. |
Applications
| Professional Microphone Preamp | Headphone Amplifier |
|---|---|
Use Scenario: Low-noise amplification of condenser mic signals before ADC conversion in field recorders and broadcast mixers. IC Role / Device Role / Timing Role: First-stage gain block with DC-coupled input, configured as noninverting amplifier with 40–60 dB gain. Use Value: 8 nV/√Hz noise density and ±0.25 mV offset ensure >110 dB SNR and minimal DC wander in phantom-powered circuits. |
Use Scenario: Driving 16–32 Ω dynamic or planar magnetic headphones from DAC outputs in studio monitors and portable players. IC Role / Device Role / Timing Role: Output buffer with rail-to-rail swing and 75 mA short-circuit capability per channel. Use Value: –109 dB THD+N at 10 mW and 8 V/µs slew rate preserve transient fidelity and bass impact without clipping. |
| Audio Mixer Summing Node | Guitar Effects Pedal Buffer |
Use Scenario: Active summing of 8–16 analog channel strips in analog control surfaces and live sound consoles. IC Role / Device Role / Timing Role: Precision inverting summing amplifier with matched input resistors and low drift. Use Value: ±0.5 µV/°C offset drift and 120 dB CMRR prevent gain error and crosstalk-induced hum in high-density PCB layouts. |
Use Scenario: High-impedance instrument input buffering and low-Z output driving in analog stompboxes and multi-effects units. IC Role / Device Role / Timing Role: Unity-gain follower with EMI-hardened inputs to reject guitar cable RFI and pedalboard switching noise. Use Value: 47.6 dB EMIRR at 400 MHz and rail-to-rail I/O enable clean tone preservation in noisy 9 V DC-powered environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1656IDR | Higher 18 MHz GBP but higher 4.5 nV/√Hz noise; no EMI filtering; 2 mA IQ. | Better for wideband active filters; less suitable for RF-noisy environments like wireless mics or USB audio interfaces. | Choose OPA1656IDR when bandwidth >10 MHz is required and EMI immunity is secondary. |
| NE5532DR | Lower 10 V/µs slew rate; 5 nV/√Hz noise; no rail-to-rail output; 8 mA IQ; no EMI filtering. | Legacy compatibility in discrete audio gear; unsuitable for low-voltage or battery-powered designs. | Choose NE5532DR only for cost-sensitive, non-portable applications where 36 V headroom and EMI robustness are unnecessary. |
Compared with OPA1688IDR, OPA1656IDR trades EMI immunity and lower quiescent current for higher bandwidth, while NE5532DR lacks rail-to-rail output and modern noise/EMI specs - making OPA1688IDR the optimal choice for new professional audio designs requiring wide supply range, low distortion, and RF resilience.
Availability
OPA1688IDR is available at Aetrix Electronics and suitable for professional audio mixer development, portable headphone amplifier production, and studio microphone preamplifier manufacturing requiring stable component supply and long-term lifecycle support.
Supply support for OPA1688IDR 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-performance audio signal chain solutions.
The OPA1688IDR belongs to TI's SoundPlus™ audio op amp family, engineered specifically for professional-grade audio equipment demanding ultra-low THD+N, wide supply flexibility, and robust EMI immunity in real-world deployment environments.
FAQ
What is the maximum supply voltage for OPA1688IDR?
The OPA1688IDR supports a maximum supply voltage of 36 V in single-supply configuration or ±18 V in dual-supply mode. Absolute maximum ratings allow ±20 V (40 V total), but recommended operating conditions specify 4.5 V to 36 V to ensure guaranteed performance, thermal stability, and longevity. Exceeding 36 V risks parametric degradation and reduced reliability.
Does OPA1688IDR support true rail-to-rail input?
OPA1688IDR supports rail-to-rail output but not full rail-to-rail input: its common-mode input range extends from (V–) – 0.1 V to (V+) – 2 V under normal operation. It can accept inputs up to the positive rail with reduced performance - a key distinction confirmed in Section 3 of the SBOS724A datasheet. This allows direct interfacing with 3.3 V logic in single-supply systems while maintaining precision near V–.
How does OPA1688IDR handle EMI in wireless audio applications?
OPA1688IDR integrates on-chip EMI filtering that achieves 114 dB rejection at 5 GHz - validated against 802.11a/n Wi-Fi bands. This eliminates need for external RC filters on inputs, preventing RF rectification artifacts in wireless microphones, Bluetooth® receivers, and USB-C audio docks without sacrificing bandwidth or adding board space.
Can OPA1688IDR replace NE5532 in existing designs?
OPA1688IDR is not a drop-in replacement for NE5532 due to differences in pinout (NE5532 uses different SOIC-8 assignment), output swing (rail-to-rail vs limited), and quiescent current (1.6 mA vs 8 mA). While both are dual op amps, redesign is required to leverage OPA1688IDR's low-noise, EMI-hardened, and wide-supply advantages - especially in portable or RF-dense applications.
What is the typical THD+N performance of OPA1688IDR at 1 kHz into 128 Ω?
OPA1688IDR achieves –116 dB THD+N at 1 kHz with 10 mW output into a 128 Ω load, as specified in Section 7.5 of the SBOS724A datasheet. This corresponds to 0.000153% distortion - significantly lower than consumer-grade op amps and sufficient for mastering-grade monitoring paths where harmonic transparency is critical.
OPA1688IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 8V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 1.6mA (x2 Channels)
- Current - Output / Channel:
- 75 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-SOIC
OPA1688IDR FAQ
1.How can I place an order for OPA1688IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1688IDR 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 OPA1688IDR reliable?
The price and inventory of OPA1688IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1688IDR is usually 5 days.
3.What payment methods are accepted for OPA1688IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1688IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1688IDR?
OPA1688IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1688IDR 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 OPA1688IDR?
For technical support, including OPA1688IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1688IDR requirements.
6.How does Aetrix verify that OPA1688IDR is sourced from the original manufacturer or authorized distributors?
All OPA1688IDR 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 OPA1688IDR meets industry standards.
7.What is the process for return or replacement of OPA1688IDR?
All OPA1688IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1688IDR, 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 OPA1688IDR part is unused and in its original packaging.
Return procedure for OPA1688IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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