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Texas Instruments OPA1637DGKR
- Part No.:
- OPA1637DGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA1637DGKR.pdf
- Description:
- IC AUDIO 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
OPA1637DGKR from Texas Instruments is a fully differential audio operational amplifier with super-beta bipolar inputs, designed for high-fidelity signal conditioning in professional audio systems. It delivers 3.7 nV/√Hz input voltage noise at 1 kHz, –120 dB THD+N at 1 kHz, and 9.2 MHz gain-bandwidth product while operating on ±18 V supplies - enabling direct drive of high-dynamic-range ADCs in mixer and microphone preamp circuits.
For engineers reviewing the OPA1637DGKR datasheet, OPA1637DGKR pinout, OPA1637DGKR application, or OPA1637DGKR equivalent, this page provides verified specifications, validated pin functions, confirmed use cases in professional audio signal chains, and two technically documented alternative FDAs with explicit functional and interface differences.
Technical Context
The OPA1637DGKR implements a fully differential architecture with independent VOCM control, enabling precise common-mode alignment to downstream ADC or Class-D amplifier inputs. Its super-beta bipolar input stage achieves ultra-low 2 nA max input bias current and 400 fA/√Hz current noise at 10 Hz - critical for high-impedance sensor interfaces and passive filter networks without degrading SNR.
It supports dual-supply operation from ±1.5 V to ±18 V (or single supply 3–36 V), features 15 V/µs differential slew rate, and includes logic-controlled power-down (<20 µA quiescent) referenced to VS+. The device maintains >120 dB CMRR and PSRR across 10 Hz–100 kHz, ensuring robust rejection of supply and common-mode interference in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 3.7 nV/√Hz at 1 kHz - enables low-noise gain stages up to 60 dB without dominating system noise floor in microphone preamps. |
| THD+N | –120 dB at 1 kHz, 10 VPP differential output - meets professional audio distortion requirements for studio-grade DAC interfaces. |
| Gain-Bandwidth Product | 9.2 MHz - supports stable unity-gain and moderate-gain configurations (e.g., G = 2–10) with full-power bandwidth >2.5 MHz. |
| Differential Slew Rate | 15 V/µs - preserves transient fidelity for wideband audio signals up to 20 kHz with minimal slew-induced distortion. |
| Supply Range | ±1.5 V to ±18 V dual supply - accommodates legacy ±15 V audio rails and modern low-voltage portable designs without level-shifting. |
| Power-Down Current | <20 µA - allows dynamic power gating in battery-powered soundbars or portable recorders without external switches. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive infotainment and industrial audio processing environments. |
Pinout & Package
OPA1637DGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size), optimized for compact audio PCB layouts with thermal performance characterized at RθJA = 181.1°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Noninverting input | Accepts positive-phase audio signal; high-impedance super-beta input minimizes loading on passive filters or transformer secondaries. |
| IN− | Inverting input | Accepts negative-phase audio signal; matched with IN+ for balanced differential input rejection. |
| OUT+ | Noninverting output | Delivers positive-phase differential output; drives one leg of ADC differential input or Class-D amplifier input stage. |
| OUT− | Inverting output | Delivers negative-phase differential output; complements OUT+ to form true differential pair with 180° phase relationship. |
| VOCM | Output common-mode voltage control | Sets DC offset of differential outputs (e.g., to match ADC mid-supply reference); 2 MHz small-signal bandwidth ensures fast settling during mode changes. |
| PD | Power-down enable | Logic-high (≥ VVS+ − 0.5 V) enables normal operation; logic-low disables amplifier and places outputs in high-Z state. |
| VS+ | Positive supply rail | Accepts up to +18 V; internal regulation supports stable biasing across wide supply range without external LDOs. |
| VS− | Negative supply rail | Accepts down to –18 V; symmetric rail capability eliminates need for virtual ground in bipolar audio signal paths. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Provides inherent common-mode noise rejection and doubled dynamic range vs. single-ended amplifiers - essential for EMI-prone studio cabling and long analog runs. |
| Super-beta bipolar input stage | Reduces input bias current to ≤2 nA max and current noise to 400 fA/√Hz at 10 Hz - enables use with high-value feedback resistors (>10 kΩ) without degrading THD+N. |
| VOCM-controlled output common-mode | Allows precise alignment of differential output DC level to ADC input requirements (e.g., 2.5 V for 5-V ADCs), eliminating AC-coupling capacitors and associated low-frequency phase shift. |
| High-voltage supply capability | Operates up to ±18 V - supports 24-dBm differential line-level outputs (±10 V) directly into professional audio gear without additional gain stages or clamping diodes. |
| Integrated power-down mode | Reduces quiescent current to <20 µA while placing outputs in high-impedance state - simplifies power sequencing in multi-channel audio processors and reduces standby power in consumer soundbars. |
Applications
| Professional Audio Mixer | Studio Microphone Preamp |
|---|---|
Use Scenario: Balanced line driver in analog channel strip of digital audio workstation (DAW) control surface with 16-channel I/O. IC Role / Device Role / Timing Role: Fully differential gain block converting mic-level XLR input to 10 VPP differential signal for 24-bit ADC sampling. Use Value: 3.7 nV/√Hz noise and –120 dB THD+N preserve transient detail and harmonic integrity across 20 Hz–20 kHz band without requiring post-amplification. |
Use Scenario: Phantom-powered condenser microphone front-end with 60 dB gain and selectable pad/filter. IC Role / Device Role / Timing Role: Low-noise, low-distortion FDA providing differential output to isolated ADC with VOCM set to 2.5 V. Use Value: Super-beta inputs draw ≤2 nA bias current - avoids loading high-impedance capsule bias networks and prevents low-frequency droop in passive high-pass filters. |
| High-Fidelity Soundbar | Data Acquisition (Audio Band) |
Use Scenario: Digital-to-analog interface stage in premium soundbar supporting Dolby Atmos decoding and multi-driver active crossover. IC Role / Device Role / Timing Role: Differential output driver between stereo DAC and Class-D amplifier inputs, using VOCM to match amplifier common-mode range. Use Value: 15 V/µs slew rate and 9.2 MHz GBW ensure accurate reproduction of complex multichannel audio transients without intermodulation distortion. |
Use Scenario: Sensor signal conditioner in portable audio spectrum analyzer with 100 kHz bandwidth and 120 dB dynamic range. IC Role / Device Role / Timing Role: Low-noise FDA amplifying piezoelectric vibration sensor output before 192-kSPS sigma-delta ADC. Use Value: 0.1 µVPP integrated input voltage noise (0.1 Hz–10 Hz) enables resolution of sub-millivolt acoustic signals buried in thermal noise floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IRGET | Higher 10.5 MHz GBW but higher 4.3 nV/√Hz input voltage noise; no VOCM pin - fixed 50% supply common-mode output. | Best suited for fixed-rail ADCs (e.g., 3.3 V SAR) where VOCM flexibility is unnecessary; less optimal for variable-supply or precision common-mode alignment. | Select THS4561IRGET when VOCM control is not required and higher bandwidth is prioritized over lowest possible noise floor. |
| ADA4945-1ACPZ-R7 | Lower 2.9 nV/√Hz noise but higher 1.8 mA quiescent current; requires external VOCM buffer for precision setting; rated only to +105°C. | Preferred for ultra-low-noise medical ultrasound front-ends where power budget permits; unsuitable for automotive under-hood use due to temperature limit. | Select ADA4945-1ACPZ-R7 when absolute minimum noise dominates design priorities and extended temperature operation is not required. |
Compared with THS4561IRGET and ADA4945-1ACPZ-R7, the OPA1637DGKR uniquely balances ultra-low noise (3.7 nV/√Hz), low power (950 µA), full VOCM control, and extended temperature rating (–40°C to +125°C) - making it the optimal choice for professional audio equipment requiring both fidelity and reliability across diverse operating conditions.
Availability
OPA1637DGKR is available at Aetrix Electronics and suitable for professional audio mixers, studio microphone preamplifiers, and high-fidelity soundbar designs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for OPA1637DGKR 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 conditioning ICs.
The OPA1637DGKR belongs to TI's Burr-Brown™ audio amplifier portfolio, engineered specifically for professional and high-end consumer audio applications demanding ultra-low noise, ultra-low distortion, and flexible differential signaling without compromising power efficiency.
FAQ
What is the maximum supply voltage for OPA1637DGKR?
The OPA1637DGKR supports dual-supply operation up to ±18 V (absolute maximum ±20 V) and single-supply operation from 3 V to 36 V. At ±18 V, it delivers full 10 VPP differential output swing into 10 kΩ loads while maintaining –120 dB THD+N - enabling direct interfacing with professional line-level standards without external level-shifting circuitry. Exceeding ±20 V risks permanent damage per absolute maximum ratings.
How does the VOCM pin function in OPA1637DGKR?
The VOCM pin on the OPA1637DGKR sets the DC common-mode voltage of the differential outputs (OUT+ and OUT−). When VOCM is tied to a stable reference (e.g., 2.5 V), the amplifier centers its differential output around that voltage - matching typical ADC input requirements. It features 2 MHz small-signal bandwidth and ±1 mV offset, allowing fast, precise alignment without external op-amps. Leaving VOCM floating results in ~2 mV offset from mid-supply.
Can OPA1637DGKR be used with single-ended input sources?
Yes, the OPA1637DGKR supports single-ended-to-differential conversion. With IN− grounded or biased and IN+ driven, the device generates a fully differential output referenced to VOCM. TI's datasheet Figure 7-2 shows a validated 1-V/V configuration using matched 2 kΩ feedback resistors. Input-referred THD+N remains –115 dB at 1 kHz, slightly higher than differential-input performance but still suitable for high-fidelity consumer audio.
What is the power-down behavior of OPA1637DGKR?
When the PD pin is pulled low (≤ VVS+ − 2.0 V), the OPA1637DGKR enters power-down mode, reducing quiescent current to <20 µA and placing both OUT+ and OUT− in high-impedance state. Turn-off delay is 15 µs; turn-on delay is 10 µs. This feature enables dynamic power management in multi-channel audio processors and portable devices without requiring external output isolation switches.
Is OPA1637DGKR suitable for driving capacitive loads?
The OPA1637DGKR can drive up to 50 pF differentially without external isolation resistors while maintaining ≥30° phase margin. For heavier loads (e.g., >100 pF), TI recommends adding 25–50 Ω series isolation resistors (RISO) at each output - as shown in datasheet Figure 6-27 - to prevent peaking and ensure stability. Driving unbuffered ADC inputs with >50 pF capacitance requires this compensation to avoid overshoot and settling errors.
OPA1637DGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 15V/µs
- Gain Bandwidth Product:
- 9.2 MHz
- -3db Bandwidth:
- 7 MHz
- Current - Input Bias:
- 200 pA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 950µA
- Current - Output / Channel:
- 31 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA1637DGKR FAQ
1.How can I place an order for OPA1637DGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1637DGKR 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 OPA1637DGKR reliable?
The price and inventory of OPA1637DGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1637DGKR is usually 5 days.
3.What payment methods are accepted for OPA1637DGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1637DGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1637DGKR?
OPA1637DGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1637DGKR 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 OPA1637DGKR?
For technical support, including OPA1637DGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1637DGKR requirements.
6.How does Aetrix verify that OPA1637DGKR is sourced from the original manufacturer or authorized distributors?
All OPA1637DGKR 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 OPA1637DGKR meets industry standards.
7.What is the process for return or replacement of OPA1637DGKR?
All OPA1637DGKR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1637DGKR, 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 OPA1637DGKR part is unused and in its original packaging.
Return procedure for OPA1637DGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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