OPA145ID - 5.5MHz Low-Noise Precision JFET Op Amp | Texas Instruments
MPN: OPA145ID ✓ فعالOPA145ID نمای کلی
جایگزین‌های drop-in برای OPA145ID — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
OPA145IDR
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
OPA145IDG
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
OPA145ID حداکثر مقادیر مجاز و مشخصات الکتریکی
| Product Type | Single operational amplifier |
| Gain-Bandwidth Product | 5.5 MHz |
| Slew Rate | 20 V/us |
| جریان تغذیه | 475 uA maximum |
| Input Offset Voltage | 150 uV maximum |
| Input Offset Drift | 1 uV/deg C maximum |
| Input Stage | JFET |
| Output Swing | Rail-to-rail output |
| Number of Circuits | 1 |
| بسته‌بندی | 8-pin SOIC |
| محدوده دمای کاری | -40 deg C to +125 deg C |
| Input Bias Current | Picoampere-class |
| Application Category | Precision instrumentation and high-impedance sensor amplification |
| Manufacturer | Texas Instruments |
| Datasheet Page Count | 42 pages |
پیکربندی پین OPA145ID
| پین 1 | NC — Not connected (per datasheet) |
| پین 2 | IN- — Inverting input |
| پین 3 | IN+ — Non-inverting input |
| پین 4 | V- — Negative supply |
| پین 5 | NC — Not connected (per datasheet) |
| پین 6 | OUT — Output |
| پین 7 | V+ — Positive supply |
| پین 8 | NC — Not connected (per datasheet) |
کاربردهای معمول
OPA145ID مناسب است برای 6 کاربردs: High-Impedance Sensor Signal Conditioning, Precision Data-Converter Front End, Battery-Powered Instrumentation, Current and Voltage Measurement, Laboratory and Test Equipment, Audio and Communication Signal Chains.
High-Impedance Sensor Signal Conditioning
OPA145ID fits high-impedance sensor front ends because its JFET input stage provides picoampere-class input bias current while maintaining low current noise. Place the amplifier close to the sensor or guarded sensor node so long high-impedance traces do not pick up leakage or coupled noise. The 150 uV maximum offset voltage and 1 uV/deg C maximum offset drift help preserve accuracy as temperature changes, while the 5.5 MHz bandwidth and 20 V/us slew rate support responsive conditioning without requiring a higher-power amplifier.
پیشنهادی
Precision Data-Converter Front End
OPA145ID is suitable for driving the input of a precision analog-to-digital converter in a single-supply instrumentation system. Its rail-to-rail output swing reduces headroom concerns near the positive or negative supply rail, and the low-noise JFET input stage helps preserve small sensor signals before conversion. The 5.5 MHz gain-bandwidth product and 20 V/us slew rate give the signal chain useful bandwidth, although the exact ADC settling requirements and the amplifier’s input common-mode range should be checked together.
پیشنهادی
Battery-Powered Instrumentation
OPA145ID supports portable and battery-powered measurement equipment with a maximum supply current of 475 uA. Low power is especially valuable when the amplifier remains active during long measurement intervals, while the JFET input stage reduces loading on high-impedance sensors. The design must account for input bias-current return paths, PCB cleanliness, and the amplifier’s supply-voltage requirements. Use low-leakage protection components near sensitive nodes and confirm the operating temperature range against the instrument enclosure conditions.
پیشنهادی
Current and Voltage Measurement
OPA145ID can serve as the gain and buffer stage in precision current- or voltage-measurement circuits where low offset and low drift influence the final result. Its JFET inputs are useful when the source impedance is high enough that input bias current would otherwise create a measurable error. A practical implementation should provide a defined bias-current return, use low-temperature-coefficient resistors, and maintain a quiet reference node. The amplifier’s 20 V/us slew rate also helps maintain response during measurement transients.
پیشنهادی
Laboratory and Test Equipment
OPA145ID is appropriate for laboratory amplifiers, programmable measurement front ends, and low-level signal-conditioning modules where noise and offset are more important than high output-current capability. Its 5.5 MHz bandwidth handles moderate-frequency signals, while the low-noise JFET input stage supports source impedances that would challenge bipolar input amplifiers. For reliable measurements, use short guarded traces, stable reference components, and a clean analog ground structure. The manufacturer’s OPA145 product page identifies precision instrumentation as a primary use case.
پیشنهادی
Audio and Communication Signal Chains
OPA145ID can be used in low-level audio and communication signal paths that benefit from low-noise, high-input-impedance amplification. The 20 V/us slew rate provides better large-signal behavior than a much slower precision amplifier, while the 5.5 MHz gain-bandwidth product covers a useful range of audio and low-frequency communication signals. The JFET input stage reduces loading of source nodes, but the output current capability and drive into the next stage should be reviewed. The OPAx145 family description specifically identifies low current noise as an important characteristic.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای OPA145ID — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | OPA145IDR | OPA145IDG |
|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Amplifier Configuration | Single | Single | Single |
| Gain-Bandwidth Product | 5.5 MHz | 5.5 MHz | 5.5 MHz |
| Slew Rate | 20 V/us | 20 V/us | 20 V/us |
| Supply Current | 475 uA maximum | 475 uA maximum | 475 uA maximum |
| Input Offset Voltage | 150 uV maximum | 150 uV maximum | 150 uV maximum |
| Input Offset Drift | 1 uV/deg C maximum | 1 uV/deg C maximum | 1 uV/deg C maximum |
| Input Bias Current | Picoampere-class | Picoampere-class | Picoampere-class |
| Output Swing | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output |
| Operating Temperature Range | -40 deg C to +125 deg C | -40 deg C to +125 deg C | -40 deg C to +125 deg C |
| Drop-In Qualification | Reference | Pin-compatible in 8-SOIC | Pin-compatible in 8-SOIC |
تفاوت‌های کلیدی
- Low-noise JFET input stage for high-impedance sources (در مقابلOPA145IDR)
- High bandwidth-to-power combination (در مقابلOPA145IDG)
- Precision offset performance (در مقابلOPA145IDR)
یادداشت‌های طراحی
Keep the OPA145ID input pins, feedback resistors, and any sensor connection short and away from switching nodes. For high-impedance sources, use a guarded or shielded input trace, remove flux residue, and avoid long exposed board areas around the input. Provide a defined bias-current return path as shown in the manufacturer’s recommended applications so that picoampere-class input bias current does not create an unpredictable output voltage.
Use the manufacturer’s recommended input and output compensation network and avoid adding large capacitors directly at the input unless the application intentionally requires them. The 5.5 MHz gain-bandwidth product and 20 V/us slew rate are useful for small-signal and moderate-bandwidth measurements, but they do not eliminate the need for stable feedback topology. Check noise gain, source capacitance, and ADC input loading together before finalizing the gain and compensation values.
The OPA145ID maximum supply current is 475 uA, but total instrument power also depends on supply voltage, sensor biasing, ADC activity, and indicator circuitry. Decouple each supply pin near the package with the manufacturer-recommended capacitor arrangement, maintain low-impedance return paths, and avoid routing high-current return paths through the analog input reference area. Confirm the operating supply and common-mode limits from the OPA145 datasheet before connecting to a selected sensor or converter.
Do not assume that rail-to-rail output implies rail-to-rail input common-mode operation. Verify the input voltage range, output swing, output-current capability, and stability requirements for the actual load. OPA145ID datasheet guidance also recommends limiting input current to 10 mA; if the source can exceed that condition, add appropriate protection so the amplifier does not source or sink uncontrolled supply current.
اطلاعات انطباق
Compliance fields are not explicitly stated in the manufacturer information and must be confirmed from the current Texas Instruments product documentation or declaration. OPA145ID is described as an operational amplifier rather than an automotive-qualified device.