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Texas Instruments OPA1664AID
- Part No.:
- OPA1664AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA1664AID.pdf
- Description:
- IC AUDIO 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:997
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Product details
Overview
OPA1664AID from Texas Instruments is a quad-channel, bipolar-input audio operational amplifier optimized for high-fidelity signal conditioning in professional and consumer audio systems. It delivers 3.3nV/√Hz input voltage noise density, 0.00006% THD+N at 1kHz, 17V/μs slew rate, and rail-to-rail output swing within 600mV of supply rails into 2kΩ - enabling low-noise, low-distortion preamplification and line-driver stages in USB audio interfaces and A/V receivers.
For engineers reviewing the OPA1664AID datasheet, OPA1664AID pinout, OPA1664AID application, or OPA1664AID equivalent, this page provides verified technical context, package-specific pin mapping (SOIC-14), key audio performance specifications, real-world application implementation insights, and two validated alternative parts with documented functional trade-offs for design flexibility.
Technical Context
The OPA1664AID implements a fully independent quad-channel architecture with no shared bias or signal paths, ensuring –120dB channel separation at 1kHz and eliminating crosstalk-induced intermodulation in multi-channel audio routing. Its bipolar input stage enables ultra-low voltage noise (3.3nV/√Hz) while maintaining 600nA typical input bias current and 1.5mA per-channel quiescent current across ±1.5V to ±18V supplies.
It achieves unity-gain stability with 22MHz gain-bandwidth product (G = +1, ±15V), supports rail-to-rail output swing into 2kΩ loads, and drives ±30mA output current - making it suitable for driving low-impedance headphones, active filters, and analog summing nodes without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 3.3nV/√Hz at 1kHz - enables high-resolution audio capture with minimal added noise floor in microphone preamps and ADC front-ends. |
| THD+N | 0.00006% at 1kHz, 3VRMS - ensures audibly transparent signal amplification in critical listening applications like studio monitors. |
| Slew Rate | 17V/μs - preserves transient fidelity of fast-rising audio waveforms (e.g., drum transients) without slew-induced distortion. |
| Supply Range | ±1.5V to ±18V or 3V to 36V - supports single-supply portable designs (e.g., 5V USB audio) and dual-supply pro-audio gear (±15V). |
| Output Swing | Rail-to-rail within 600mV into 2kΩ - maximizes dynamic range by delivering >28Vpp output from ±15V supplies. |
| Channel Separation | –120dB at 1kHz - prevents audible leakage between left/right or surround channels in quad-configured mixers and processors. |
| Quiescent Current | 1.5mA per channel - allows four independent amplifiers in space-constrained PCB layouts without thermal derating concerns. |
Pinout & Package
OPA1664AID is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) body with standard 1.27mm pitch, compatible with automated assembly and IPC-7351B footprint D_14_SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load directly; rail-to-rail capable with 600mV headroom. |
| 2 | IN− A | Inverting input for Channel A - accepts feedback network or differential signal reference. |
| 3 | IN+ A | Non-inverting input for Channel A - high-impedance node (600MΩ || 2.5pF) for sensor or line-level signal injection. |
| 4 | V+ | Positive power supply - accepts up to +18V (dual) or +36V (single); decoupling required at pin. |
| 5 | IN+ B | Non-inverting input for Channel B - electrically isolated from other channels to prevent crosstalk. |
| 6 | IN− B | Inverting input for Channel B - supports independent gain configuration per channel. |
| 7 | OUT B | Amplifier B output - identical performance to OUT A; usable for stereo pair or dual mono paths. |
| 8 | V− | Negative power supply - accepts down to –18V (dual) or GND (single-supply); requires local 0.1μF decoupling. |
| 9 | OUT C | Amplifier C output - enables 3-channel processing (e.g., L/C/R) or multi-band EQ without additional ICs. |
| 10 | IN− C | Inverting input for Channel C - supports cascaded filtering or summing configurations. |
| 11 | IN+ C | Non-inverting input for Channel C - maintains same CMVR (V− + 0.5V to V+ − 1V) as other inputs. |
| 12 | IN+ D | Non-inverting input for Channel D - allows full quad-channel operation in compact 14-pin footprint. |
| 13 | IN− D | Inverting input for Channel D - independent biasing ensures consistent offset behavior across all four channels. |
| 14 | OUT D | Amplifier D output - completes quad functionality; supports 4.0/4.1/5.1 channel audio routing or dual stereo pairs. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar input stage | Delivers 3.3nV/√Hz noise density and 600nA input bias current - optimal for low-Z sources (<1kΩ) like DAC outputs and line drivers. |
| Rail-to-rail output | Swings to within 600mV of V+ and V− into 2kΩ - increases usable signal swing by ≥1.2Vpp vs conventional op amps at ±15V. |
| Independent channel circuitry | Ensures –120dB channel separation and zero interaction during overload - critical for multi-channel summing and matrix mixing. |
| Unity-gain stable | Operates reliably at G = +1 without external compensation - simplifies buffer and active filter designs in audio signal chains. |
| Wide supply range | Functions from ±1.5V to ±18V - supports battery-powered portable recorders (±1.5V) and mains-powered studio gear (±15V) with one BOM item. |
Applications
| USB Audio Interface | Analog Mixer Channel Strip |
|---|---|
Use Scenario: High-resolution 24-bit/192kHz audio streaming from PC/Mac to external DAC via USB 2.0, requiring ultra-low-noise analog buffering before digital conversion. IC Role / Device Role / Timing Role: Quad OPA1664AID serves as four independent line-receive buffers (L/R/aux/instrument), each configured as unity-gain voltage followers with 0.00006% THD+N. Use Value: 3.3nV/√Hz noise floor preserves SNR >118dB(A) across full bandwidth, preventing quantization noise masking in 24-bit systems. |
Use Scenario: 16-channel analog mixing console with discrete preamp, EQ, and bus-summing stages requiring matched gain blocks and minimal crosstalk. IC Role / Device Role / Timing Role: OPA1664AID implements four parallel channel strips (e.g., channels 1–4), each using one amplifier for input buffering, one for EQ drive, one for fader feed, and one for bus summing. Use Value: –120dB channel separation eliminates audible bleed between adjacent channels during aggressive panning or soloing. |
| Portable Recording System | High-End Car Audio Processor |
Use Scenario: Battery-powered field recorder capturing ambient sound with condenser mics, requiring low-quiescent-current analog front-end without sacrificing fidelity. IC Role / Device Role / Timing Role: OPA1664AID operates from ±1.5V supplies (3V total) as mic preamp gain stage and headphone driver, drawing only 6mA total quiescent current. Use Value: 1.5mA/channel quiescent current extends 3.7V Li-ion battery life to >12 hours while maintaining <0.0001% THD+N at line level. |
Use Scenario: Aftermarket DSP-based car audio processor performing real-time crossover, time alignment, and equalization before sending signals to multi-amp systems. IC Role / Device Role / Timing Role: OPA1664AID provides four independent post-DSP analog output buffers driving 4–8Ω speaker-level signals via external Class AB amplifiers. Use Value: ±30mA output drive capability ensures stable 2Vrms line-level output into 600Ω source impedance, meeting automotive OEM signal integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AIDR | Lower noise (1.1nV/√Hz), dual-channel only, higher IQ (3.6mA/ch), ±2.25V to ±18V supply | Preferred for ultra-low-noise microphone preamps but requires two ICs for quad functionality and consumes >2× quiescent power | Select OPA1612AIDR when absolute lowest noise dominates over channel count and power budget; not drop-in for OPA1664AID due to pinout and channel mismatch. |
| NE5532AP | Higher noise (5nV/√Hz), higher THD+N (0.002%), 8mA/ch IQ, fixed ±15V optimization, no rail-to-rail output | Legacy industrial audio use; limited dynamic range due to 2V output headroom loss at ±15V | Choose NE5532AP only for cost-sensitive, non-critical line-level applications where 110dB SNR suffices and board space allows SOIC-8 × 2 instead of single SOIC-14. |
Compared with OPA1612AIDR and NE5532AP, the OPA1664AID uniquely balances quad-channel integration, 3.3nV/√Hz noise, rail-to-rail output, and 1.5mA/ch quiescent current - making it the only option that meets simultaneous requirements for space-constrained, battery-aware, high-SNR audio signal chains.
Availability
OPA1664AID is available at Aetrix Electronics and suitable for USB audio interfaces, analog mixers, portable recording systems, and high-end car audio processors requiring stable component supply, long-term production continuity, and guaranteed TI original packaging.
Supply support for OPA1664AID 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 precision op amp design and audio signal chain innovation.
The OPA1664AID belongs to TI's SoundPlus™ audio op amp family, engineered specifically for high-fidelity audio equipment where ultra-low noise, ultra-low distortion, and channel independence are mandatory - not optional.
FAQ
What is the maximum capacitive load the OPA1664AID can drive while maintaining stability?
The OPA1664AID is characterized to drive up to 200pF capacitive load with stable operation and ≤5% overshoot in unity-gain configuration. For loads exceeding 200pF, a series resistor (RS) of 25Ω–50Ω placed between the output pin and the load restores phase margin - confirmed in Figure 5-25 of the SBOS489A datasheet. This applies directly to OPA1664AID in SOIC-14 packages under ±15V conditions.
Does the OPA1664AID support single-supply operation, and what is the minimum supply voltage?
Yes, the OPA1664AID supports true single-supply operation from 3V to 36V total supply range - meaning it functions with V+ = 3V and V− = GND. The minimum recommended supply is 3V (not ±1.5V), as specified in Section 5.3 "Recommended Operating Conditions" of the SBOS489A datasheet. At 3V, OPA1664AID maintains rail-to-rail output swing and 0.0001% THD+N performance.
How does the OPA1664AID achieve –120dB channel separation, and is it measured per channel pair?
The OPA1664AID achieves –120dB channel separation through completely independent internal circuitry - no shared bias current sources, current mirrors, or substrate coupling paths between channels. This is measured per channel pair (e.g., A-to-B, A-to-C, A-to-D) at 1kHz with 3VRMS output, as documented in Table 5-6 "Electrical Characteristics" of the SBOS489A datasheet. The value holds across temperature (–40°C to +85°C) and supply voltage (±1.5V to ±18V).
Can the OPA1664AID be used in inverting amplifier configurations, and what is its slew rate in that mode?
Yes, the OPA1664AID is fully specified for inverting configurations. Its slew rate is 17V/μs for G = –1 (inverting unity gain), matching its non-inverting performance - verified in Table 5-6 under "Slew rate" test condition "G = –1". This ensures symmetrical transient response regardless of topology, critical for balanced audio signal inversion in differential driver stages using OPA1664AID.
What is the input common-mode voltage range for the OPA1664AID, and does it include the negative rail?
The input common-mode voltage range for OPA1664AID is (V−) + 0.5V to (V+) – 1V, as specified in Table 5-6. This means the inputs cannot swing to the negative rail (V−) - they require at least +0.5V headroom above V−. For example, with V− = 0V (single supply), the minimum valid input is +0.5V; with V− = –15V, the minimum is –14.5V. This limitation is inherent to its bipolar input stage and applies identically across all four channels of OPA1664AID.
OPA1664AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 17V/µs
- Gain Bandwidth Product:
- 22 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 600 nA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 1.5mA (x4 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA1664AID FAQ
1.How can I place an order for OPA1664AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1664AID 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 OPA1664AID reliable?
The price and inventory of OPA1664AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1664AID is usually 5 days.
3.What payment methods are accepted for OPA1664AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1664AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1664AID?
OPA1664AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1664AID 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 OPA1664AID?
For technical support, including OPA1664AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1664AID requirements.
6.How does Aetrix verify that OPA1664AID is sourced from the original manufacturer or authorized distributors?
All OPA1664AID 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 OPA1664AID meets industry standards.
7.What is the process for return or replacement of OPA1664AID?
All OPA1664AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA1664AID, 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 OPA1664AID part is unused and in its original packaging.
Return procedure for OPA1664AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA1664AID Tags
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LM358DT
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LM358DR
Texas Instruments
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LM358P
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