OPA388ID - 10 MHz Zero-Drift Precision Op Amp | Texas Instruments
MPN： OPA388ID ✓ 啟用中OPA388ID 概覽
A zero-drift operational amplifier is a precision amplifier architecture that continuously corrects its input offset voltage to reduce temperature-dependent drift. The OPA388 family combines this behavior with zero-crossover operation, low-noise performance, fast settling, and true rail-to-rail input and output capability. It belongs to the broader hierarchy of operational amplifier, analog amplifier, analog IC, and semiconductor devices.
The OPA388ID offers 10 MHz gain-bandwidth performance and true rail-to-rail operation at its input and output. Its 0.25 µV offset specification supports accurate sensing of low-level signals, while the 0.005 µV/°C drift specification improves stability across changing ambient temperatures. These characteristics make the device useful in precision measurement, current sensing, sensor interfaces, and buffered analog systems where conventional amplifiers can introduce significant low-frequency error.
The CMOS implementation and zero-crossover architecture are intended to reduce distortion during input and output signal transitions. Rail-to-rail input operation permits the common-mode input range to extend close to the supply rails, while rail-to-rail output operation increases usable output swing. The result is a precision amplifier that can operate directly from low-voltage supplies without sacrificing input range or output headroom.
Typical applications include precision bridge and strain-gauge signal conditioning, buffered sensor outputs, low-level current measurement, laboratory instrumentation, industrial measurement systems, and analog-to-digital converter input drivers. The OPA388 is especially useful when the signal of interest is small, slowly varying, or monitored over a broad temperature range and requires the amplifier's offset and drift characteristics rather than maximum bandwidth.
When designing around the OPA388ID, evaluate the complete signal path rather than the amplifier alone. Sensor excitation, reference voltage, resistor-network tolerance, input bias current, source impedance, ADC input range, and thermal gradients all contribute to system error. Stable layout, careful grounding, appropriate bypass capacitance, and attention to leakage or thermoelectric effects are necessary to preserve the precision promised by the low-offset device.
This page combines manufacturer specifications with package, sourcing, application, and design guidance for engineers evaluating the OPA388ID. It also distinguishes confirmed device characteristics from parameters that require the manufacturer datasheet or a current distributor quotation, helping support faster component selection and more reliable PCB design decisions.
直接替換替代品，適用於 OPA388ID — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品OPA388ID 最大額定值與電氣特性
| Product Type | Precision operational amplifier |
| Number of Channels | 1 channel |
| Gain-Bandwidth Product | 10 MHz |
| Technology | CMOS |
| Architecture | Zero-drift, zero-crossover |
| Input Common-Mode Range | True rail-to-rail |
| Output Swing | True rail-to-rail |
| Input Offset Voltage | 0.25 µV |
| Input Offset Voltage Drift | 0.005 µV/°C |
| 工作溫度範圍 | -40 °C to +125 °C |
| 封裝 | 8-SOIC |
| 安裝類型 | Surface mount |
OPA388ID 8-soic 腳位配置指南
OPA388ID（8-soic 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： OPA388ID.
請參閱 資料表 以查看完整腳位配置。
典型應用
OPA388ID 適用於 6 應用s: Precision Bridge and Strain-Gauge Signal Conditioning, Precision Current Sensing, High-Resolution ADC Input Buffer, Low-Level Sensor Signal Conditioning, Laboratory and Process Instrumentation, Precision Voltage Reference Buffering.
Precision Bridge and Strain-Gauge Signal Conditioning
The OPA388ID fits low-level bridge instrumentation because its 0.25 µV input offset and 0.005 µV/°C drift limit amplifier-generated error relative to many small sensor signals. Its true rail-to-rail input range supports operation across much of the bridge excitation voltage, while the 10 MHz gain-bandwidth product provides useful bandwidth for filtering and settling. Use the amplifier with low-noise excitation and carefully matched resistor networks, because sensor resistance, resistor tolerance, thermal gradients, and input bias current can still dominate the final accuracy.
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Precision Current Sensing
The OPA388ID can amplify small shunt-voltage signals where low offset and low thermal drift are important to measurement accuracy. Its 0.25 µV offset and 0.005 µV/°C drift reduce errors when the shunt voltage is small, and the CMOS amplifier's 10 MHz gain-bandwidth product allows a practical closed-loop bandwidth in the hundreds of kilohertz range depending on noise and gain. Keep the shunt layout compact, use Kelvin-style connections where appropriate, and account for amplifier bias current and resistor self-heating.
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High-Resolution ADC Input Buffer
The OPA388ID is appropriate for buffering the analog output of a DAC or driving the input of a high-resolution ADC because it combines 10 MHz bandwidth, fast-settling behavior, true rail-to-rail output capability, and low offset. The low drift specification helps preserve dc accuracy over temperature, while the zero-crossover architecture is intended to minimize crossover-related distortion. The achievable settling time and drive capability still depend on the selected ADC's acquisition network, so use the ADC manufacturer's recommended RC values and verify dynamic settling at the required signal rate.
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Low-Level Sensor Signal Conditioning
The OPA388ID suits temperature, pressure, chemical, and resistive sensors whose output is small enough that offset and drift determine usable resolution. True rail-to-rail input operation helps maximize the usable common-mode span in compact low-voltage systems, while the 0.25 µV offset specification supports high-gain amplification close to the sensor output. Check source impedance and bias-current behavior carefully, place the amplifier close to the sensor or ADC, and provide clean excitation and reference voltages to prevent the amplifier from masking a stable but noisy measurement chain.
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Laboratory and Process Instrumentation
The OPA388ID is useful in laboratory and process-instrumentation front ends that amplify small sensor signals over a broad environmental temperature range. Its 0.005 µV/°C drift supports stable measurements, while 10 MHz bandwidth and true rail-to-rail output support faster measurements than a purely low-bandwidth precision amplifier. A practical implementation should include input protection, stable reference and excitation circuitry, shield or guard techniques for high-impedance nodes, and calibration that captures resistor and sensor behavior across temperature.
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Precision Voltage Reference Buffering
The OPA388ID can buffer low-current voltage references when the load must be driven with low added offset and temperature drift. Its 0.25 µV input offset and 0.005 µV/°C drift are valuable for preserving reference accuracy, while true rail-to-rail output capability helps utilize the available supply range. Confirm reference output impedance, capacitive-load stability, output-current capability, and power-supply noise behavior in the manufacturer datasheet. Place the buffer close to the reference and decoupling network to minimize board-level coupling and thermal gradients.
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推薦產品摘要
工程參考資料，適用於 OPA388ID — 比較、設計指引及合規資訊。
選型指南
設計說明
Place the OPA388ID close to the high-impedance input node and the ADC or sensor being measured. Keep input traces short, avoid routing near switching nodes, and use a grounded guard structure where leakage could affect the input. Precision performance depends on the complete layout, so a low amplifier offset cannot compensate for contamination, moisture, resistor self-heating, or unwanted input capacitance.
Do not select the amplifier from offset and drift specifications alone. Confirm supply voltage, input common-mode range, output swing, input bias current, noise, settling time, and capacitive-load stability for the actual operating conditions. A 0.25 µV offset is valuable only when source impedance, reference accuracy, ADC resolution, and system calibration do not introduce larger errors.
Use the supply bypass and grounding arrangement specified in the manufacturer datasheet, and keep return-current paths away from precision input traces. Check the amplifier's quiescent current and supply limits before defining the power budget because those values are not established by the orderable-part listing. If the source is a switching converter, allow additional filtering and verify that supply ripple does not dominate the measured signal.
合規資訊
The available product and distributor listings do not explicitly state the compliance status for OPA388ID. Obtain current declarations and qualification records from Texas Instruments before production release.
