LT1882IS - Quad Picoamp Input Precision Op Amp | ADI
MPN: LT1882IS ✓ AktifLT1882IS Genel Bakış
An operational amplifier, or op amp, is a high-gain analog building block used to amplify, buffer, filter, and compare small voltage signals. The LT1882 belongs to the precision operational amplifier category, which sits within analog ICs and broader semiconductor signal-conditioning systems. Its rail-to-rail output stage allows the output to approach the supply limits, while the picoamp input bias current reduces measurement errors when driving high-impedance sensors, photodiodes, and high-impedance feedback networks.
Key features include four amplifiers in one package, a 1 MHz gain-bandwidth product, a 0.4 V/µs slew rate, input offset voltage trimmed to less than 50 µV, rail-to-rail output operation, and picoamp input bias current. These characteristics make the LT1882 particularly useful when a design requires precision DC behavior but does not need the higher speed of the LT1884 or LT1885. The manufacturer identifies thermocouple amplifiers, bridge-transducer conditioners, instrumentation amplifiers, battery-powered systems, and photodiode current amplifiers as representative applications.
The LT1882 combines precision input characteristics with conservative speed and drive capability. Its lower bandwidth than the LT1884/LT1885 is intentional: reduced speed improves input-noise behavior, bias-current performance, and capacitive-load drive in exchange for slower slew and less bandwidth. Because all four channels share one package, designers can implement several gain stages, buffers, or active filters while controlling board area. Independent amplifiers can also be used for instrumentation front ends, although system-level offset and drift still require calibration when very high absolute accuracy is needed.
Typical uses include thermocouple and low-level sensor conditioning, strain-gauge bridge signal amplification, precision current-to-voltage conversion for photodiodes, low-power instrumentation, and buffered sensor interfaces. In battery-powered equipment, the low input bias current can reduce demand on high-value precision resistors and sensitive transducers. The rail-to-rail output also improves usable signal swing in low-voltage systems, although headroom, output-current limits, and capacitive loading must be checked in the final operating condition.
For PCB implementation, place each input and feedback component close to its associated amplifier pins, keep sensitive input traces short, and provide solid ground-plane continuity. Bypass the supply pins locally with the manufacturer-recommended ceramic capacitance. Avoid placing long parallel routes beneath sensitive amplifier inputs, because capacitive pickup can increase output noise or disturb bias-current measurements. Confirm output stability with the external load capacitance and feedback network used in the final circuit.
This product page combines the manufacturer application positioning, package and performance characteristics, orderable-package details, and a focused replacement analysis. It also adds practical guidance for precision sensor interfaces, bridge conditioners, photodiode amplifiers, battery-powered systems, and instrumentation while clearly separating the LT1882 from higher-speed family members.
Drop-in alternatifler için LT1882IS — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller LT1882IS (aynı form faktörü ve ayağa oturma) — farklı olan Amplifier Type, Input Bias Current Class, Input Offset Voltage, Mounting Type, Package.
LT1885IS
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LT1884IS
✅ Yerleştirme ⚠️ Onaylanmamış Özellikler📋 Katalogda Olmayan Referans Alternatifi
LT1882CS
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
LT1882IS Maksimum Değerlendirmeler & Elektriksel Özellikler
| Number of Amplifiers | 4 circuits |
| Amplifier Type | General-purpose precision operational amplifier |
| Output Topology | Rail-to-rail output |
| Gain-Bandwidth Product | 1 MHz |
| Slew Rate | 0.4 V/µs |
| Input Offset Voltage | Less than 50 µV |
| Input Bias Current Class | Picoamp input |
| Supply Voltage Range | 2.7 V to 36 V |
| Dual-Supply Operating Range | ±18 V |
| Paket | 14-pin SOIC, 3.90 mm wide |
| Montaj Türü | Surface mount |
| Packaging | Tube |
LT1882IS Pin Yapısı
| Pin 1 | OUTA — Amplifier A output |
| Pin 2 | -INA — Amplifier A inverting input |
| Pin 3 | +INA — Amplifier A non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | +INB — Amplifier B non-inverting input |
| Pin 6 | -INB — Amplifier B inverting input |
| Pin 7 | OUTB — Amplifier B output |
| Pin 8 | OUTC — Amplifier C output |
| Pin 9 | -INC — Amplifier C inverting input |
| Pin 10 | +INC — Amplifier C non-inverting input |
| Pin 11 | V+ — Positive supply |
| Pin 12 | +IND — Amplifier D non-inverting input |
| Pin 13 | -IND — Amplifier D inverting input |
| Pin 14 | OUTD — Amplifier D output |
Tipik Uygulamalar
LT1882IS için uygundur 6 uygulamas: Thermouple Signal Conditioning, Bridge Transducer Conditioning, Photodiode Current Measurement, Precision Instrumentation Amplifier, Battery-Powered Sensor Interface, Low-Level Analog Signal Buffering.
Thermouple Signal Conditioning
The LT1882IS is well suited to low-level thermocouple amplification because its picoamp-class input bias current limits the error generated by high-value source and feedback resistances. Its input offset voltage is trimmed below 50 µV according to the Analog Devices LT1881/LT1882 datasheet, helping preserve small sensor signals at the amplifier input. The device is commonly positioned in an instrumentation chain ahead of filtering and conversion electronics. Designers should use an appropriate cold-junction compensation network, place the input path away from switching nodes, and verify that the chosen gain keeps the complete signal within the amplifier's common-mode and output-swing limits.
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Bridge Transducer Conditioning
For strain-gauge bridges, RTDs, and other high-impedance transducers, the LT1882IS can provide differential signal amplification while keeping input bias-current errors small. The 14-pin package provides four amplifiers, allowing a design to combine differential gain stages, active filters, and output buffering in one component family. Analog Devices identifies bridge-transducer conditioners as a principal LT1882 application. A practical implementation should use matched resistors with suitable tracking, include the required bridge excitation, and keep the amplifier input and feedback nodes physically short to reduce thermal EMF and leakage effects.
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Photodiode Current Measurement
The LT1882IS can convert weak photodiode currents into measurable voltages when a high-value feedback resistor establishes the transimpedance gain. Picoamp input bias current is especially useful in this topology because bias current through a large feedback resistance creates an input-referred error proportional to the resistor value. The datasheet identifies photodiode and photo-current amplification as typical uses. Designers should include the photodiode capacitance and feedback capacitance in stability checks, keep the summing node compact, and select resistor ratings and board cleanliness appropriate to the intended optical sensitivity.
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Precision Instrumentation Amplifier
The LT1882IS can form the gain and buffering elements of a three-op-amp instrumentation architecture while offering low input bias current and trimmed offset. Using two devices provides a quad-channel implementation in two 14-pin packages, which is useful for multichannel sensor acquisition. The rail-to-rail output improves signal swing in compact, low-voltage instruments, while the 1 MHz gain-bandwidth product supports moderate-bandwidth instrumentation. Matched feedback resistors are important for common-mode rejection, and the final design should be checked for input common-mode range, output clipping, noise correlation, and channel-to-channel gain error.
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Battery-Powered Sensor Interface
In battery-powered measurement equipment, the LT1882IS offers a practical combination of low input bias current, low offset, and rail-to-rail output for sensor interfaces operating from limited supply voltage. The picoamp input characteristics reduce the loading imposed on high-impedance sensors and conserve precision-resistor requirements. Its four independent channels can amplify, filter, and buffer several low-frequency signals without requiring multiple single-amplifier packages. For portable products, verify the complete operating range of the selected LT1882 grade, account for supply current in the battery budget, and provide stable bypass capacitance close to both supply pins.
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Low-Level Analog Signal Buffering
The LT1882IS can buffer weak analog signals into higher-impedance downstream circuits while retaining useful voltage headroom through its rail-to-rail output stage. Four channels in one 14-pin SOIC allow multiple buffers or repeated conditioning stages to be placed close to a sensor or connector. The 0.4 V/µs slew rate and 1 MHz gain-bandwidth product are adequate for many low-frequency measurement and control signals. Engineers should use unity-gain stability techniques appropriate to the device, avoid excessive capacitive loading at the output, and keep sensitive routes short to minimize pickup and ground-current interaction.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: LT1882IS — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | LT1885IS | LT1884IS | LT1882CS |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 14-pin SOIC | 14-pin SOIC - same | 14-pin SOIC - same | 14-pin SOIC - same |
| Number of Amplifiers | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
| Output Topology | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output | Rail-to-rail output |
| Speed Class | Precision, 1 MHz gain-bandwidth product | Higher speed | Higher speed | Precision, 1 MHz gain-bandwidth product |
Ana Farklılayıcılar
- Precision bias-current behavior favors high-impedance sensing (karşılaştırma:LT1885IS)
- Four precision channels in one 14-pin package (karşılaştırma:LT1882CS)
- Lower-speed precision profile supports sensitive signal conditioning (karşılaştırma:LT1884IS)
Tasarım Notları
Place each amplifier's input and feedback components directly beside the associated LT1882IS pins. Keep the high-impedance input node as short as practical, avoid routing it beneath switching nodes, and maintain continuous ground-plane return beneath the SOIC. For photodiode, thermocouple, and bridge inputs, use guarding or shielding where appropriate and clean the board to reduce surface leakage into picoamp-level bias-current measurements.
Connect bypass capacitance directly between V+ and V- pins or to the nearest appropriate supply and ground planes, following the capacitance values and layout guidance in the manufacturer datasheet. Keep the two supply planes free of abrupt current changes caused by unrelated digital circuitry. Because the LT1882 supports operation down to 2.7 V, verify output swing and input common-mode range at the minimum system voltage rather than assuming rail-to-rail operation covers every input and output state.
Do not select the LT1885IS or LT1884IS solely because they use a 14-pin SOIC. The higher-speed alternatives can change noise, bias-current, slew-rate, and stability behavior in precision circuits. Compare the actual operating frequency, sensor capacitance, feedback network, output load, supply range, and temperature grade in the manufacturer data. Likewise, the LT1882CS is mechanically compatible but its temperature grade differs, so it is appropriate only when that grade matches the deployment environment.
Uyumluluk Bilgisi
The LT1882 is a conventional commercial or industrial precision analog IC. No specific RoHS, REACH, halogen-free, or conflict-minerals declaration is stated for this exact ordering code, so these fields remain unknown.
