LT1465CS - Quad Micropower JFET Op Amp | Analog Devices
MPN: LT1465CS ✓ פעילLT1465CS סקירה
An operational amplifier is an analog signal-processing IC that amplifies the voltage difference between its non-inverting and inverting inputs. The JFET-input LT1465CS belongs to the precision amplifier hierarchy, combining low-power operation with high input impedance, low bias current, and rail-to-rail output swing characteristics. Its four independent amplifier sections make it especially useful in compact instrumentation where board area and standby consumption are important design constraints.
Key features include a typical input bias current of 500 fA, maximum supply current of 200 µA per amplifier, and unity-gain stability with capacitive loads up to 10 nF. The output can drive a 10 kΩ load to within 1.5 V of either supply rail. These characteristics support low-leakage sensor interfaces, precision current-feedback circuits, battery-powered measurement systems, and signal chains where amplifier input loading must remain small.
The JFET input stage provides the core low-bias-current behavior, while the quad configuration integrates four amplifiers into one package. Because the device remains stable at unity gain with substantial capacitive loading, it can be used directly with long sensor wires, switched-capacitor networks, and external sampling or protection structures without requiring an isolation resistor in every case. Rail-limited output swing must still be considered when designing low-voltage signals.
Typical applications include precision current measurement, photodiode and other high-impedance sensor interfaces, low-power battery monitoring, industrial instrumentation, data acquisition, and portable test equipment. In each case, the combination of picoampere-class input bias current and low per-amplifier supply current supports accurate sensing while limiting standby demand.
For layout, keep the four amplifier sections and their feedback networks close to the corresponding pins, maintain a common ground reference, and place input components away from switching nodes. Review the manufacturer data sheet for the complete pin assignment, supply limits, input and output ranges, and recommended operating conditions before releasing the PCB.
This page organizes the manufacturer specifications, sourcing options, drop-in replacement assessment, and application-oriented design guidance for engineers evaluating the LT1465CS. It also distinguishes electrically identical order codes from true cross-brand drop-in equivalents and highlights the package and pin-compatibility checks that matter during redesigns.
חלופות תחליף ישיר עבור LT1465CS — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
אין חלופות תואמות Drop-in עבור מוצר זה.
בקשת חלופותLT1465CS דירוגים מרביים ומאפיינים חשמליים
| Amplifier Count | 4 amplifiers |
| Input Stage | JFET |
| Maximum Supply Current per Amplifier | 200 µA |
| Typical Input Bias Current | 500 fA |
| Capacitive Load Stability | 10 nF at unity gain |
| Output Load Capability | 10 kΩ |
| Output Swing to Supply Rail | Within 1.5 V of either supply |
| Unity-Gain Stability | Stable |
| Circuit Type | 4-circuit operational amplifier |
| מארז | 14-lead SOIC |
| סוג הרכבה | Surface mount |
מדריך תצורת פינים של LT1465CS 14-lead soic
תצורת פינים עבור LT1465CS (מארזת 14-lead soic). רכיב אנלוגי זה כולל פיני כניסה, יציאה ואספקת מתח. יש לעיין בגיליון הנתונים של היצרן לתצורות פיני איפוס היסט, פיצוי והפעלה. אידיאלי למעגלי עיצוב אותות ומגברים.
אין נתוני פריסת פינים מפורטים עבור LT1465CS.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
LT1465CS מתאים עבור 6 יישוםs: Precision Current Measurement, High-Impedance Sensor Interfacing, Battery-Powered Instrumentation, Photodiode Signal Conditioning, Industrial Data Acquisition, Low-Power Active Filters.
Precision Current Measurement
The LT1465CS fits four-channel precision current-measurement front ends because each amplifier contributes no more than 200 µA of supply current while maintaining a typical 500 fA input bias current. The low bias current reduces measurement error caused by sensor or shunt-node impedance and is especially useful when the source resistance is high. Use one amplifier for each differential measurement channel and configure the remaining stages for gain, filtering, or buffer functions. Because the device is unity-gain stable with capacitive loads up to 10 nF, it can also tolerate appreciable cable or protection capacitance, although transient response must still be verified in the final board.
מומלץ
High-Impedance Sensor Interfacing
The LT1465CS is appropriate for high-impedance sensors where amplifier input bias current can dominate the measurement error. Its JFET input stage provides a typical bias current of 500 fA, while the quad architecture allows four independent channels to share one 14-lead SOIC package. The manufacturer specifies unity-gain stability for capacitive loads up to 10 nF, which is useful with long shielded sensor leads, switched-capacitor networks, and guarded PCB structures. Keep sensitive input traces short, away from switching nodes, and over a continuous ground plane. Verify input common-mode and output swing limits against the sensor voltage range before finalizing the amplifier gain.
מומלץ
Battery-Powered Instrumentation
The LT1465CS supports low-power battery-operated instruments where every milliampere can shorten operating time. The maximum supply current of 200 µA per amplifier allows four analog channels to operate from one compact package, while the 500 fA typical input bias current reduces errors in high-source-impedance probes. Its unity-gain stability with loads up to 10 nF provides flexibility when connecting long cables or guarded cables to remote sensors. Power-system design should still account for the complete sensor, reference, and signal-conditioning circuit. The output can swing a 10 kΩ load to within 1.5 V of either supply, so downstream headroom must be checked at the lowest battery voltage.
מומלץ
Photodiode Signal Conditioning
The LT1465CS can provide low-input-current signal conditioning for photodiode, phototransistor, and other leakage-sensitive sensors. The typical 500 fA input bias current limits the standing error current that would otherwise flow through a high-value feedback network. Its unity-gain stability with capacitive loads up to 10 nF also helps accommodate cable capacitance and input-node parasitics commonly encountered in optical and laboratory equipment. The quad package provides separate transimpedance, post-amplifier, filter, and output-buffer sections. Keep the transimpedance feedback network close to the relevant amplifier, use a guard structure around the input node, and confirm output headroom because the output remains approximately 1.5 V inside either supply rail under a 10 kΩ load.
מומלץ
Industrial Data Acquisition
The LT1465CS is useful in compact industrial data-acquisition modules that require multiple low-input-bias amplifier channels without consuming excessive power. Four channels can be implemented in one 14-lead SOIC, reducing board area compared with four single-amplifier packages. The 200 µA maximum supply current per amplifier is valuable in distributed or remotely powered measurement systems, while 500 fA typical input bias current protects accuracy when transducer resistance is substantial. Provide filtering close to each input, route analog signals away from digital and switching traces, and use solid grounding that avoids long return paths. The manufacturer-specified 10 nF capacitive-load stability limit should be checked against connector, cable, and protection-device capacitance.
מומלץ
Low-Power Active Filters
The LT1465CS can implement active filters and signal conditioners where low quiescent current, low input bias current, and capacitive-load stability are useful together. The four amplifier sections can form two voltage-feedback stages, a buffered ladder or state-variable filter, or a combination of gain, filtering, and output buffering. Its unity-gain stability supports capacitors at the input and output of individual stages up to the manufacturer's stated 10 nF limit, making implementation less dependent on isolation resistors. Component tolerances and the amplifier's actual gain-bandwidth response will determine filter accuracy, so those details must be taken from the manufacturer data sheet. Keep each passive network close to its amplifier and avoid sharing sensitive high-impedance nodes with external switching circuits.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור LT1465CS — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה |
|---|---|
| Package | 14-lead SOIC |
| Brand | Analog Devices |
| Amplifier Count | 4 amplifiers |
| Input Stage | JFET |
| Maximum Supply Current per Amplifier | 200 µA |
| Typical Input Bias Current | 500 fA |
| Unity-Gain Capacitive Load Stability | 10 nF |
| Output Load | 10 kΩ |
| Output Swing to Supply Rail | Within 1.5 V of either supply |
מבדילים עיקריים
- Four low-bias-current amplifiers in one package (לעומתLT1464)
- Capacitive-load stability supports practical sensor connections (לעומתOPA132UA)
- Low per-amplifier supply demand (לעומתLT1464)
הערות תכנון
Place each amplifier's feedback resistors, compensation capacitors, and input components close to their associated pins. High-impedance nodes should be surrounded by grounded guard traces where appropriate, and sensitive inputs should remain separated from switching-regulator and digital timing nodes. This layout is especially important because the LT1465CS is intended to exploit its 500 fA typical input bias current and 10 nF capacitive-load stability.
Do not treat the 10 nF capacitive-load figure as permission to place unlimited capacitance at every amplifier input or output. Include connector, cable, protection-diode, and PCB parasitic capacitance in the total load, then verify transient behavior at the intended operating frequency. Also account for the output remaining within approximately 1.5 V of either supply when driving a 10 kΩ load.
Use a low-impedance ground plane and connect bypassing capacitors directly between the appropriate supply pins and ground. Keep the analog return path compact and avoid routing input signals alongside clock, switching, or high-current return paths. Because four amplifiers share one package, preserve independent, short feedback loops for each channel to prevent interaction between adjacent measurement or filtering stages.
מידע על תאימות
No explicit compliance statement is included in the manufacturer page excerpts or distributor snippets. LT1465CS#PBF is a lead-free order-code designation, but it does not by itself establish the complete compliance profile of the assembled product.
