OPA632U - 68MHz, 6mA Op Amp Single-Supply SOIC-8 | Texas Instruments
MPN: OPA632U ✓ نشطOPA632U نظرة عامة
An operational amplifier (op amp) is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output. Within the broader taxonomy, the OPA632 belongs to the voltage-feedback amplifier (VFA) family, which sits under the linear amplifier IC class, which in turn is a sub-category of analog signal-conditioning integrated circuits. The OPA632's distinguishing feature versus general-purpose op amps is its combination of wide bandwidth, high slew rate, and low input voltage noise (6 nV/sqrt(Hz)) in a power-efficient package.
Key features of the OPA632U include 68 MHz unity-gain bandwidth, 100 V/us slew rate, 6 nV/sqrt(Hz) input-referenced voltage noise density, a low 6 mA quiescent current, and an integrated shutdown pin for power saving. The amplifier is unity-gain stable and provides a rail-to-rail output swing that approaches the positive rail and includes ground at the negative input range, easing single-supply signal chain design.
Internally, the OPA632 uses a complementary bipolar architecture with a proprietary input stage that achieves low input bias current while preserving high bandwidth. The architecture delivers low distortion (typically 0.02 percent THD+N at 1 kHz into 600 ohm loads) and excellent DC precision, with a typical input offset voltage of +/-1 mV. The 8-pin SOIC (D) package is pin-compatible with industry-standard single op amp footprints, allowing drop-in replacement in existing designs.
Typical applications of the OPA632U include high-fidelity audio ADC input buffers, active filter blocks, photodiode transimpedance front-ends, professional audio line drivers, and portable instrumentation. In each case, the combination of 68 MHz bandwidth, 6 mA supply current, and shutdown support makes the OPA632 a flexible analog building block for cost-sensitive but performance-critical designs.
When designing with the OPA632U, observe the maximum supply rating of +12 V (or +/-6 V dual) and ensure output loading remains within the datasheet's safe operating area. Decouple the supply pin with a 0.1 uF ceramic capacitor placed within 5 mm of the IC, and use low-ESR bulk capacitance if the supply traces exceed 25 mm. The enable/disable pin should be tied to the positive supply through a 10 kohm resistor if the shutdown feature is not used, to prevent floating-input noise on that pin.
بدائل مباشرة لـ OPA632U — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع OPA632U (نفس عامل الشكل والبصمة) — يختلف في Package, Slew Rate, Amplifier Type, Operating Temperature Range, RoHS Status.
OPA634U
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←OPA627AU
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LM358D
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←LM2904M
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←AD8055ARZ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MAX4450EUK+T
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
OPA632U الحدود القصوى والخصائص الكهربائية
| Manufacturer | Texas Instruments (formerly Burr-Brown) |
| Amplifier Type | Voltage Feedback |
| Number of Channels | 1 |
| Slew Rate | 100 V/us |
| Unity-Gain Bandwidth | 68 MHz |
| Supply Current (per channel) | 6 mA |
| Input Voltage Noise Density | 6 nV/sqrt(Hz) |
| Input Offset Voltage (typical) | +/-1 mV |
| Single-Supply Operating Range | +2.5 V to +10 V |
| Dual-Supply Operating Range | +/-2.5 V to +/-5 V |
| Output Swing (5 V supply, 2 kohm load) | 4.8 V |
| Input Common-Mode Range | Includes ground |
| Shutdown Feature | Yes (zero-power disable pin) |
| نطاق درجة حرارة التشغيل | -40 C to +85 C |
| العلبة | 8-SOIC (D) |
| نوع التركيب | Surface Mount |
| حالة RoHS | Compliant |
| مستوى MSL | 1 (unlimited floor life) |
تكوين أطراف OPA632U
| دبوس 1 | NC — No connection |
| دبوس 2 | IN- — Inverting input |
| دبوس 3 | IN+ — Non-inverting input |
| دبوس 4 | V- — Negative supply (or ground for single-supply) |
| دبوس 5 | SHDN — Shutdown/enable (active low) |
| دبوس 6 | V+ — Positive supply |
| دبوس 7 | NC — No connection |
| دبوس 8 | OUT — Amplifier output |
التطبيقات النموذجية
OPA632U مناسب لـ 6 التطبيقs: Audio ADC Input Buffer, Active Filter Block, Photodiode Transimpedance Amplifier, Video Line Driver, Portable Instrumentation Front-End, Professional Audio Line Driver.
Audio ADC Input Buffer
The OPA632U is a strong fit for audio ADC input buffers where 6 nV/sqrt(Hz) input noise floor and 68 MHz bandwidth preserve dynamic range above the noise contribution of mid-resolution audio ADCs. Placed between the analog source and the ADC's input network, the part's single-supply 5 V operation eliminates the dual-rail supply cost common in audio paths, and the 4.8 V output swing on a 5 V rail provides >3 Vrms of headroom into 2 kohm ADC driver loads. The shutdown pin also enables power gating in portable audio recorders.
موصى به
Active Filter Block
The OPA632U's 68 MHz gain-bandwidth product and 100 V/us slew rate support Sallen-Key, multiple-feedback (MFB), and state-variable active filter topologies at cutoff frequencies up to 5 MHz. Unity-gain stability with capacitive loads up to 100 pF makes the part well suited for low-pass anti-aliasing filters feeding high-speed ADCs. The single-supply rail-includes-ground input range lets designers use ground-referenced source signals without level shifting, while the 6 mA quiescent current keeps thermal dissipation modest in dense filter banks.
موصى به
Photodiode Transimpedance Amplifier
For moderate-bandwidth photodiode front-ends, the OPA632U's 6 nV/sqrt(Hz) input voltage noise and 100 V/us slew rate allow transimpedance gains of 10-100 kohm with closed-loop bandwidths approaching 1 MHz. The bipolar input stage provides low input bias current for silicon PIN photodiodes, and the shutdown feature enables pulsed-light applications such as LIDAR receivers and time-of-flight sensors to gate the analog front-end between measurements, reducing average system power.
موصى به
Video Line Driver
The OPA632U drives 75 ohm video loads with 0.1 dB gain flatness up to 10 MHz and differential gain/phase below 0.05 percent/0.05 degree, making it suitable for composite video distribution and NTSC/PAL line-driving. The 4.8 V output swing on 5 V supply easily delivers 2 Vpp into a doubly-terminated 75 ohm line. Its single-supply 5 V operation also matches typical video ASIC environments without needing a -5 V rail, simplifying PCB layout.
موصى به
Portable Instrumentation Front-End
Battery-powered test and measurement instruments benefit from the OPA632U's 6 mA quiescent current, single 5 V supply operation, and shutdown feature that drops consumption below 1 uA. Its 68 MHz bandwidth supports 1 MHz-class sensor signal conditioning, and the 6 nV/sqrt(Hz) noise floor preserves the dynamic range of 16-18 bit SAR ADCs in handheld multimeters, data loggers, and field-portable oscilloscope probe amplifiers.
موصى به
Professional Audio Line Driver
Professional audio line drivers and headphone amplifiers benefit from the OPA632U's 0.02 percent THD+N at 1 kHz, 6 nV/sqrt(Hz) noise floor, and 100 V/us slew rate that keeps distortion low at high output amplitudes. The shutdown pin enables mute-on-idle in pro-audio mixers and broadcast consoles, while the SOIC-8 footprint simplifies board-level rework in densely populated audio signal paths where PCB real estate is at a premium.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ OPA632U — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | OPA634U | OPA627AU | LM358D | LM2904M | AD8055ARZ | MAX4450EUK+T |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices (Maxim) |
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same |
| Bandwidth | 68 MHz | 100 MHz | 16 MHz | 1 MHz | 1 MHz | 300 MHz | 200 MHz |
| Slew Rate | 100 V/us | 100 V/us | 55 V/us | 0.3 V/us | 0.3 V/us | 1150 V/us | 485 V/us |
| Supply Current | 6 mA | 8 mA | 7 mA | 0.7 mA | 0.7 mA | 5.5 mA | 5.5 mA |
| Input Voltage Noise | 6 nV/sqrt(Hz) | 7 nV/sqrt(Hz) | 4.5 nV/sqrt(Hz) | 40 nV/sqrt(Hz) | 40 nV/sqrt(Hz) | 6 nV/sqrt(Hz) | 6 nV/sqrt(Hz) |
| Single-Supply Range | 2.5 V to 10 V | 2.5 V to 10 V | Dual +/-5 V to +/-18 V | 3 V to 32 V | 3 V to 32 V | 8 V to 12 V (dual +/-4 V to +/-6 V) | 2.7 V to 11 V |
| Shutdown Pin | Yes (SHDN) | Yes (SHDN) | No | No | No | No | No |
| Architecture | Voltage Feedback | Current Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback | Voltage Feedback |
أبرز الفروقات
- Single-supply 5 V operation with ground-sensing input (مقابلOPA627AU)
- Higher bandwidth and slew rate than legacy dual op amps (مقابلLM358D)
- Integrated shutdown pin for power gating (مقابلAD8055ARZ)
ملاحظات التصميم
Decouple the V+ pin with a 0.1 uF X7R ceramic capacitor placed within 5 mm of the IC, with an additional 10 uF tantalum or aluminum-polymer bulk capacitor for supply traces longer than 25 mm. For single-supply 5 V operation, connect V- directly to ground. The SHDN pin has an internal pull-down and should be tied to V+ through a 10 kohm resistor when shutdown is not used, to avoid floating-input noise and unintended enable cycling.
Estimated: at V+ = 5 V, V- = 0 V, 6 mA quiescent current, and SOIC-8 theta_JA of approximately 150 C/W, the OPA632U dissipates 30 mW and the junction temperature rises about 4.5 C above ambient. No heatsink is required. The shutdown feature reduces quiescent current below 1 uA, which is useful for battery-powered designs that need to extend operating time between charges. Continuous short-circuit current is internally limited to approximately +/-30 mA.
Use a ground plane on the layer directly beneath the SOIC-8 footprint and stitch the perimeter with vias on a 5 mm grid. Route input and feedback traces on the top layer to minimize parasitic capacitance, and keep the feedback resistor within 3 mm of the IN- pin. For driving 75 ohm video loads, place the back-termination resistor within 5 mm of the output pin to control transmission-line reflections above 10 MHz.
Do not apply input voltages that exceed the V+ rail or fall below the V- rail by more than 0.5 V, as the input ESD diodes will conduct and distort the signal. The SHDN pin must not be left floating - either drive it actively or pull it to V+ through a 10 kohm resistor. The output is not short-circuit-safe to ground indefinitely; observe the +/-30 mA internal current limit. Avoid capacitive loads above 200 pF without a 50-100 ohm series isolation resistor to prevent output peaking.
معلومات الامتثال
OPA632U is RoHS-compliant and lead-free per Texas Instruments product page. Not AEC-Q100 qualified; for automotive-grade single-supply 5 V op amps consider the LM2904M automotive variant or the OPA4H014-EP. Manufactured in 8-SOIC JEDEC-standard package.
