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Texas Instruments OPA1633DR
- Part No.:
- OPA1633DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA1633DR.pdf
- Description:
- IC DIFFERENTIAL 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,223
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Product details
Overview
OPA1633DR from Texas Instruments is a fully differential audio operational amplifier designed to drive high-performance audio ADCs (e.g., PCM1804) or serve as a predriver for Class-D amplifiers. It delivers 132 dB THD+N at 1 kHz, 1.1 nV/√Hz input voltage noise, 80 V/μs slew rate, and operates from ±2.5 V to ±17.5 V supplies - enabling ultra-low-distortion signal conditioning in professional audio front-ends.
For engineers reviewing the OPA1633DR datasheet, OPA1633DR pinout, OPA1633DR application, or OPA1633DR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The OPA1633DR implements a voltage-feedback fully differential architecture with independent input and output common-mode control. Its VOCM pin sets output DC bias (e.g., 2.5 V for PCM1804 interfacing), while balanced OUT+ and OUT− outputs suppress even-order harmonics and reject common-mode noise.
It supports both differential-input and single-ended-to-differential-output configurations using external resistor networks (e.g., 390 Ω RF/ RG for G = +1). The enable pin (active-high, referenced to V−) reduces quiescent current to 0.77 mA in shutdown, but does not place outputs in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 132 dB at 1 kHz, 3 VRMS, RL = 2 kΩ - enables >120 dB dynamic range in professional audio digitization paths. |
| Input Voltage Noise | 1.1 nV/√Hz at 10 kHz - preserves SNR when amplifying low-level microphone or phono signals. |
| Slew Rate | 80 V/μs - supports clean transient response up to 200 kHz full-power bandwidth without slewing distortion. |
| Gain Bandwidth | 200 MHz at G = +1 - ensures stable unity-gain operation with minimal phase margin loss into capacitive ADC inputs. |
| Supply Range | ±2.5 V to ±17.5 V dual supply - accommodates line-level (±2.5 V) through studio-grade (±15 V) signal chains. |
| Shutdown Current | 0.77 mA at ±5 V - reduces system power by >90% during idle without requiring output isolation circuitry. |
| Operating Temp | –40°C to +85°C - qualified for embedded audio modules in industrial or broadcast equipment enclosures. |
Pinout & Package
OPA1633DR is available in SOIC-8 (D package, 4.9 mm × 6 mm) and HVSSOP-8 (DGN package, 3 mm × 4.9 mm) with exposed thermal pad. Both packages share identical pin numbering and function mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (1) | Negative input | Differential input node; requires matched impedance to IN+ for optimal CMRR and balance. |
| VOCM (2) | Output common-mode control | DC bias reference input; sets average of OUT+ and OUT−; must be driven by low-impedance source (e.g., buffered VCOM from PCM1804). |
| V+ (3) | Positive supply | Connects to +VS rail; bypass with 0.1 µF ceramic capacitor directly at pin for stability. |
| OUT+ (4) | Positive differential output | Drives one side of balanced load or ADC differential input; output swing limited to (V+) − 1.9 V / (V−) + 1.9 V. |
| OUT− (5) | Negative differential output | Complementary output to OUT+; phase-inverted; imbalance degrades HD2 and CMRR. |
| V− (6) | Negative supply | Connects to −VS rail; bypass with 0.1 µF ceramic capacitor directly at pin. |
| Enable (7) | Active-high shutdown control | Logic high (> V− + 2 V) enables amplifier; logic low (< V− + 0.8 V) disables output stage; internal pullup defaults to enabled. |
| IN+ (8) | Positive input | Differential input node; used with IN− for balanced sources or alone (with IN− grounded) for single-ended input conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Converts single-ended input to balanced differential output with <0.01% amplitude/phase mismatch - eliminates need for discrete transformer or balun in ADC driver stages. |
| Ultra-low THD+N | 132 dB at 1 kHz, 3 VRMS - meets THX Ultra and EBU R68 broadcast standards for analog front-end line drivers. |
| Low-noise precision | 1.1 nV/√Hz input voltage noise + 1.3 pA/√Hz input current noise - maintains >118 dB SNR with 10 kΩ source impedances typical in mixer channel strips. |
| Thermally enhanced HVSSOP option | RθJB = 30.0 °C/W - enables 2× higher continuous output power vs SOIC-8 in space-constrained audio modules without forced air cooling. |
| Configurable gain & filtering | Supports G = +1 to +10 via standard resistor values (e.g., 390 Ω to 4.02 kΩ); integrated VOCM interface simplifies DC-coupled anti-alias filter design. |
Applications
| Professional Audio ADC Driver | Studio Microphone Preamplifier |
|---|---|
Use Scenario: Driving the differential inputs of high-resolution audio ADCs such as PCM1804 in recording interfaces or digital mixers. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, common-mode level shifting (via VOCM), and low-noise signal conditioning before digitization. Use Value: Achieves 132 dB THD+N and 1.1 nV/√Hz noise floor - preserving full 24-bit dynamic range without post-processing correction. |
Use Scenario: Low-noise gain stage for condenser microphones in broadcast consoles or field recorders. IC Role / Device Role / Timing Role: Single-ended input to differential output converter with programmable common-mode bias for phantom-powered mic capsules. Use Value: Enables direct coupling to ADCs while rejecting cable-borne RFI and ground-loop hum via balanced output topology. |
| Class-D Amplifier Predriver | High-Fidelity Soundbar Signal Chain |
Use Scenario: Buffering and level-shifting line-level signals before feeding half-bridge gate drivers in compact active speakers. IC Role / Device Role / Timing Role: High-slew-rate FDA delivering fast transient response and wide bandwidth to minimize PWM modulation distortion. Use Value: 80 V/μs slew rate and 200 MHz GBW ensure accurate reproduction of sharp transients - critical for maintaining clarity in bass-heavy content. |
Use Scenario: Main stereo channel driver in slim-profile soundbars requiring low-heat, high-fidelity analog processing. IC Role / Device Role / Timing Role: Dual-channel-capable FDA (per channel) operating from ±5 V supplies to reduce thermal load in enclosed chassis. Use Value: 0.77 mA shutdown current and HVSSOP thermal performance allow fanless operation while sustaining >110 dB SNR across 20 Hz–20 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1632DR | Pin-compatible predecessor; 131 dB THD+N, 1.2 nV/√Hz noise, no Enable pin - lacks shutdown functionality and has slightly lower AC performance. | Used where power cycling is unnecessary and legacy board layouts exist; not suitable for battery-powered or energy-aware systems. | Select OPA1632DR only if existing PCB layout mandates pin compatibility and shutdown is not required. |
| LM4562MA | Single-ended dual op-amp; 132 dB THD+N, 2.7 nV/√Hz noise, no differential outputs - requires external resistive network to emulate FDA behavior. | Applicable in cost-sensitive designs where discrete differential conversion is acceptable and board area permits extra passives. | Choose LM4562MA when differential output is not mandatory and BOM cost reduction outweighs layout complexity and noise penalty. |
Compared with OPA1632DR, the OPA1633DR adds active shutdown and improves noise by 0.1 nV/√Hz; compared with LM4562MA, it integrates differential conversion, eliminates matching resistor sensitivity, and achieves 1.6× lower input noise without external components.
Availability
OPA1633DR is available at Aetrix Electronics and suitable for professional audio mixer development, studio microphone preamplifier production, and high-fidelity soundbar manufacturing requiring stable component supply and long-term lifecycle assurance.
Supply support for OPA1633DR 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 over 50 years of innovation in high-precision signal chain solutions.
The OPA1633DR belongs to TI's OPA high-performance audio amplifier product line, engineered specifically for low-noise, low-distortion analog signal conditioning in professional and broadcast audio systems.
FAQ
What is the primary circuit role of the OPA1633DR in audio systems?
The OPA1633DR serves as a fully differential amplifier that converts single-ended inputs to balanced differential outputs or amplifies differential signals directly. Its core role is driving high-performance audio ADCs like the PCM1804 or acting as a predriver for Class-D amplifier stages - delivering ultra-low distortion, wide bandwidth, and precise common-mode control essential for professional audio fidelity. This function is intrinsic to the OPA1633DR's architecture and validated across its recommended operating conditions.
Does the OPA1633DR support single-supply operation?
Yes, the OPA1633DR supports single-supply operation from 4 V to 35 V, as specified in its Recommended Operating Conditions. In single-supply mode, the VOCM pin must be biased to set the output common-mode voltage appropriately - for example, to mid-rail (VCC/2) or an external reference such as 2.5 V from an ADC's VCOM pin. This capability makes the OPA1633DR adaptable to portable and space-constrained audio designs without requiring dual rails. All performance metrics in the OPA1633DR datasheet include single-supply test conditions.
How does the Enable pin on the OPA1633DR function, and what happens to the outputs during shutdown?
The Enable pin (Pin 7) on the OPA1633DR is an active-high control referenced to V−. Applying a voltage > V− + 2 V enables normal operation; applying < V− + 0.8 V disables the amplifier, reducing quiescent current to 0.77 mA at ±5 V. Critically, the OPA1633DR outputs do not enter a high-impedance state during shutdown - they remain actively driven near their last valid common-mode level. Therefore, the OPA1633DR cannot be used for analog multiplexing; external switches or relays are required for true signal isolation. This behavior is explicitly documented in the OPA1633DR device functional modes section.
What is the significance of the VOCM pin in OPA1633DR applications?
The VOCM (Voltage Output Common-Mode) pin on the OPA1633DR directly sets the average DC voltage of the differential outputs (i.e., (OUT+ + OUT−)/2). It enables precise interfacing with ADCs requiring specific input common-mode voltages - such as the PCM1804's 2.5 V VCOM reference. Driving VOCM with a low-impedance source (e.g., buffered op-amp output) ensures stable biasing and minimizes distortion from VOCM impedance interactions. Leaving VOCM floating defaults it to mid-rail, but this is not recommended for production designs due to potential noise coupling. This VOCM control mechanism is a defining feature of the OPA1633DR's FDA architecture.
Can the OPA1633DR replace the OPA1632DR without PCB changes?
Yes, the OPA1633DR is pin-compatible with the OPA1632DR in SOIC-8 and HVSSOP-8 packages and shares identical pin functions, footprint, and recommended operating conditions. However, the OPA1633DR adds an Enable pin (previously NC on OPA1632DR) and improves THD+N by 1 dB and input voltage noise by 0.1 nV/√Hz. To retain full functionality, the Enable pin must be pulled high (e.g., to V+ via 10 kΩ) if unused. No trace modifications are needed, making the OPA1633DR a drop-in upgrade for existing OPA1632DR designs seeking enhanced performance and power control.
OPA1633DR 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:
- Standard
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 80V/µs
- Gain Bandwidth Product:
- 200 MHz
- -3db Bandwidth:
- 200 MHz
- Current - Input Bias:
- 6.8 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 11mA
- Current - Output / Channel:
- 85 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 35 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA1633DR FAQ
1.How can I place an order for OPA1633DR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1633DR 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 OPA1633DR reliable?
The price and inventory of OPA1633DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1633DR is usually 5 days.
3.What payment methods are accepted for OPA1633DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1633DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1633DR?
OPA1633DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1633DR 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 OPA1633DR?
For technical support, including OPA1633DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1633DR requirements.
6.How does Aetrix verify that OPA1633DR is sourced from the original manufacturer or authorized distributors?
All OPA1633DR 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 OPA1633DR meets industry standards.
7.What is the process for return or replacement of OPA1633DR?
All OPA1633DR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1633DR, 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 OPA1633DR part is unused and in its original packaging.
Return procedure for OPA1633DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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