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Texas Instruments OPA1688IDRGT
- Part No.:
- OPA1688IDRGT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
OPA1688IDRGT.pdf
- Description:
- IC OPAMP AUDIO 2 CIRCUIT 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:650
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Product details
Overview
OPA1688IDRGT from Texas Instruments is a dual-channel, 36-V, rail-to-rail output audio operational amplifier optimized for professional-grade analog signal paths. It delivers –109 dB THD+N at 1 kHz into 32 Ω, 10 MHz gain bandwidth, ±0.25 mV max offset voltage, and 8 nV/√Hz input voltage noise-enabling high-fidelity headphone and line-level amplification in studio mixers and guitar amps.
For engineers reviewing the OPA1688IDRGT datasheet, OPA1688IDRGT pinout, OPA1688IDRGT application, or OPA1688IDRGT equivalent, this page provides verified specifications, WSON-8 package details, real-world audio performance metrics, and validated alternative op amps for low-noise, wide-supply audio designs.
Technical Context
The OPA1688IDRGT implements a three-stage, active-feedforward amplifier topology with EMI-filtered inputs and phase-reversal protection. Its input stage operates from (V–) – 0.1 V to (V+) – 2 V, enabling true single-supply operation with full rail-to-rail output swing within 100 mV of both rails.
Specified across ±2.25 V to ±18 V (4.5 V to 36 V), it maintains <±1.5 mV offset drift over –40°C to +85°C and achieves 120 dB CMRR at ±18 V-critical for rejecting ground-loop and supply-induced distortion in multi-channel audio systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4.5 V to 36 V single supply or ±2.25 V to ±18 V dual supply-supports battery-powered portable gear and fixed-line studio equipment without level-shifting. |
| THD+N | –109 dB at 1 kHz, 10 mW into 32 Ω-meets professional audio requirements for headphone drivers with negligible harmonic contamination. |
| Gain Bandwidth | 10 MHz-enables stable unity-gain configurations and preserves transient fidelity up to 20 kHz with >10× margin. |
| Input Voltage Noise | 8 nV/√Hz at 1 kHz-low enough to avoid degrading SNR in microphone preamp or DAC output stages. |
| Input Bias Current | ±10 pA max-minimizes DC error in high-impedance sensor interfaces and passive filter networks. |
| Quiescent Current | 1.6 mA per amplifier-balances ultra-low noise with power efficiency in dual-channel applications like stereo headphone amps. |
| CMRR | 120 dB at ±18 V-rejects common-mode interference from shared power rails in multi-amplifier PCB layouts. |
Pinout & Package
OPA1688IDRGT is packaged in an 8-pin WSON (DRG) package measuring 3.00 mm × 3.00 mm with wettable flanks, optimized for space-constrained audio modules and high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | –IN A | Inverting input for channel A-accepts feedback network for precise gain control in inverting amplifier configurations. |
| 2 | OUT A | Output for channel A-capable of ±75 mA short-circuit current and rail-to-rail swing within 100 mV of supply rails. |
| 3 | OUT B | Output for channel B-electrically isolated from OUT A; supports independent stereo or dual-mono signal paths. |
| 4 | –IN B | Inverting input for channel B-matched to –IN A for consistent AC coupling and feedback design across channels. |
| 5 | +IN B | Noninverting input for channel B-enables unity-gain buffer or noninverting gain stages with minimal input offset error. |
| 6 | V+ | Positive power supply terminal-must be decoupled with ≥1 µF ceramic capacitor near the pin to suppress high-frequency supply noise. |
| 7 | V– | Negative (or ground) power supply terminal-serves as reference for single-supply operation; accepts 0 V or negative bias. |
| 8 | +IN A | Noninverting input for channel A-features EMI-filtered input structure to reject RF ingress from nearby digital circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| EMI- and RFI-filtered inputs | EMIRR of 114 dB at 5 GHz-prevents wireless interference (e.g., Wi-Fi, Bluetooth) from modulating audio signals in compact consumer electronics. |
| Rail-to-rail output | Swings to within 100 mV of V+ and V–-maximizes dynamic range in 3.3 V or 5 V single-supply portable audio without external level-shifting. |
| Phase-reversal protection | Prevents output polarity inversion when input exceeds common-mode range-eliminates audible "pop" during power-up or signal transients. |
| Low offset drift | ±0.5 µV/°C typical-ensures stable DC operating point across temperature in precision summing or DC-coupled monitor outputs. |
| High channel separation | –120 dB at 1 kHz-maintains stereo imaging integrity in dual-channel headphone amplifiers and mixer buses. |
Applications
| Professional Audio Mixer | Guitar Amplifier Preamp |
|---|---|
|
Use Scenario: Dual-channel summing and level control in analog console channel strips with discrete mic preamps and insert points. IC Role / Device Role / Timing Role: Dual op amp configured as unity-gain buffers and inverting summing nodes to preserve signal integrity across multiple gain stages. Use Value: 120 dB CMRR rejects crosstalk between adjacent channels; 10 MHz GBP ensures flat frequency response up to 200 kHz for ultrasonic headroom. |
Use Scenario: High-impedance instrument input buffering and tone-stack driver in tube-emulation solid-state guitar amps. IC Role / Device Role / Timing Role: Noninverting buffer for 1 MΩ guitar pickup source, followed by active tone control and gain staging before power amp input. Use Value: ±10 pA input bias current prevents treble loss in passive tone networks; rail-to-rail output drives 10 kΩ load without clipping. |
| Studio Headphone Amplifier | A/V Receiver Line Output |
|
Use Scenario: Stereo headphone driver delivering 50 mW into 32 Ω loads with zero audible distortion in critical listening environments. IC Role / Device Role / Timing Role: Dual-channel, G = 2 inverting amplifier with local feedback and output RC filtering for optimal damping factor. Use Value: –109 dB THD+N at 10 mW meets AES17 professional standards; 8 nV/√Hz noise floor avoids hiss even at maximum volume. |
Use Scenario: Fixed-gain line-level output stage driving RCA jacks in home theater receivers with multiple source inputs. IC Role / Device Role / Timing Role: Dual op amp configured as unity-gain voltage followers to isolate DAC outputs from variable cable capacitance and downstream loading. Use Value: 10 MHz GBP ensures phase coherence across 20 Hz–20 kHz; 1.6 mA quiescent current enables always-on operation without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1656IDBVT | Lower noise (4.5 nV/√Hz), higher GBP (18 MHz), but higher IQ (2 mA) and narrower supply range (±2.25 V to ±18 V only). | Better suited for ultra-low-noise microphone preamps where power budget allows; less ideal for battery-powered portable gear. | Select OPA1656IDBVT when THD+N below –115 dB is required and supply headroom permits higher quiescent current. |
| OPA1662AIDRGT | Lower noise (3.3 nV/√Hz), higher GBP (22 MHz), but higher IQ (1.5 mA per amp) and no EMI filtering-requires external RF suppression. | Preferred for high-bandwidth DAC output stages where EMI immunity is managed at board level via layout and shielding. | Choose OPA1662AIDRGT for cost-sensitive, high-volume consumer audio where board-level EMI mitigation is already implemented. |
Compared with OPA1688IDRGT, OPA1656IDBVT trades 1.1 dB lower THD+N for 0.4 mA higher per-channel current, while OPA1662AIDRGT offers superior noise and speed but requires external EMI countermeasures-making OPA1688IDRGT the balanced choice for robust, production-ready audio designs.
Availability
OPA1688IDRGT is available at Aetrix Electronics and suitable for professional audio mixer design, studio headphone amplifier development, and guitar amplifier preamp implementation requiring stable component supply and long-term production continuity.
Supply support for OPA1688IDRGT 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 OPA1688IDRGT belongs to TI's SoundPlus™ audio op amp family, engineered specifically for low-noise, low-distortion, wide-supply audio applications-from portable instruments to rack-mounted studio gear.
FAQ
What is the maximum supply voltage for OPA1688IDRGT?
The OPA1688IDRGT supports a maximum supply voltage of 36 V in single-supply mode or ±18 V in dual-supply mode. Absolute maximum ratings specify ±20 V (40 V total), but recommended operation is limited to ±18 V to ensure long-term reliability and specified performance across temperature. Exceeding ±18 V may degrade THD+N and increase offset drift beyond datasheet limits.
Does OPA1688IDRGT support true rail-to-rail input operation?
The OPA1688IDRGT supports rail-to-rail *output*, but its input common-mode range extends only to (V–) – 0.1 V and (V+) – 2 V under normal operation. Full rail-to-rail input is possible beyond the top rail (up to V+ + 100 mV), though with reduced performance within 2 V of V+. This architecture enables robust single-supply use while maintaining precision near the positive rail.
Can OPA1688IDRGT drive 16 Ω headphones directly?
No-OPA1688IDRGT is not rated for direct 16 Ω headphone driving. Its output stage delivers ±75 mA short-circuit current and is optimized for loads ≥600 Ω in precision line-driving roles. For 16 Ω loads, a dedicated headphone amplifier IC (e.g., TPA6133A2) or discrete output stage is required to meet current and damping factor requirements without distortion.
What is the significance of EMIRR specification for OPA1688IDRGT?
EMIRR (Electromagnetic Interference Rejection Ratio) quantifies how well OPA1688IDRGT rejects RF energy coupled into its inputs-critical in mixed-signal PCBs. At 5 GHz, OPA1688IDRGT achieves 114 dB EMIRR, meaning a –10 dBm RF signal induces only ~0.3 µV of error at the output. This eliminates need for external ferrite beads or RC filters in Wi-Fi/Bluetooth-enabled audio products.
How does OPA1688IDRGT handle input overdrive conditions?
OPA1688IDRGT includes internal phase-reversal protection, preventing output polarity inversion when inputs exceed the common-mode range. It recovers from overload in 200 ns and tolerates differential input transients up to ±0.5 V without latch-up. This ensures glitch-free operation during power sequencing, hot-plug events, or accidental signal surges in live audio systems.
OPA1688IDRGT 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:
- 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-SON (3x3)
OPA1688IDRGT FAQ
1.How can I place an order for OPA1688IDRGT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1688IDRGT 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 OPA1688IDRGT reliable?
The price and inventory of OPA1688IDRGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1688IDRGT is usually 5 days.
3.What payment methods are accepted for OPA1688IDRGT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1688IDRGT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1688IDRGT?
OPA1688IDRGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1688IDRGT 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 OPA1688IDRGT?
For technical support, including OPA1688IDRGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1688IDRGT requirements.
6.How does Aetrix verify that OPA1688IDRGT is sourced from the original manufacturer or authorized distributors?
All OPA1688IDRGT 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 OPA1688IDRGT meets industry standards.
7.What is the process for return or replacement of OPA1688IDRGT?
All OPA1688IDRGT units undergo pre-shipment inspection (PSI). If there is an issue with OPA1688IDRGT, 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 OPA1688IDRGT part is unused and in its original packaging.
Return procedure for OPA1688IDRGT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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