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Analog Devices Inc. LT1885CS#PBF
- Part No.:
- LT1885CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1885CS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
LT1885CS#PBF from Analog Devices (formerly Linear Technology) is a quad precision rail-to-rail output operational amplifier with picoampere input bias current, 50 µV max input offset voltage (LT1884A-grade spec), and 1 V/µs slew rate. It operates from ±1.35V to ±15V or 2.7V–36V single supply, delivering 40 mV low-side and 220 mV high-side output swing near rails-ideal for battery-powered instrumentation and thermocouple signal conditioning.
For engineers reviewing the LT1885CS#PBF datasheet, LT1885CS#PBF pinout, LT1885CS#PBF application, or LT1885CS#PBF equivalent, key selection criteria include verified input offset drift ≤0.8 µV/°C, guaranteed 14-pin SOIC package compatibility, rail-to-rail output performance under 1 mA per amplifier supply current, and confirmed quad-channel matching specs for multi-channel precision systems.
Technical Context
The LT1885CS#PBF implements a bipolar input stage with on-chip bias current cancellation, enabling 400 pA max input bias current while maintaining low input offset voltage drift. Its open-loop gain exceeds 350 V/mV at 2 kΩ load and full temperature range, supporting stable closed-loop operation in high-precision integrators and current sources.
It features matched amplifier pairs (A/D and B/C) with ≤125 µV offset voltage match and ≤1.2 µV/°C match drift over –40°C to 85°C, enabling accurate differential signal processing without external trimming. Input common-mode range extends from VEE + 1.2 V to VCC – 1.2 V, and output swing remains within 40 mV of VEE and 220 mV of VCC at 1 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 50 µV max (LT1884A grade); ensures ≤0.05 mV DC error in 1 V full-scale precision sensor interfaces |
| Input Bias Current | 400 pA max; enables use with >100 MΩ source impedances without significant voltage error |
| Offset Drift | 0.8 µV/°C max; limits thermal-induced error to <6.4 µV over 80°C ambient shift |
| Slew Rate | 1 V/µs; supports 10 µs settling to 0.01% for 2 V step, critical for fast-settling data acquisition |
| Supply Current | 1.4 mA max per amplifier at 5 V; allows four channels to operate below 6 mA total in portable systems |
| Rail-to-Rail Output | Swings to 40 mV above VEE and 220 mV below VCC at 1 mA; maximizes dynamic range in low-voltage single-supply designs |
| Gain-Bandwidth | 2 MHz typical; supports stable unity-gain operation with ≥300 pF capacitive load drive capability |
Pinout & Package
LT1885CS#PBF is housed in a 14-lead plastic SOIC (S package) with standard quad op amp pinout and JEDEC MS-012AC footprint. Thermal resistance θJA = 110°C/W enables operation up to 150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load; rail-to-rail swing referenced to V+ and V− |
| 2 (–IN A) | Inverting input A | High-impedance node; requires guard ring layout for pA-level bias current integrity |
| 3 (+IN A) | Noninverting input A | High-impedance node; matched to Pin 2 for CMRR optimization |
| 4 (V+) | Positive supply | Accepts 2.7–36 V single or +15 V in split-supply configurations |
| 5 (+IN B) | Noninverting input B | Independent high-Z input; shares V+ and V− rails with other amplifiers |
| 6 (–IN B) | Inverting input B | Matched to Pin 5; supports dual-channel differential pair implementation |
| 7 (OUT B) | Amplifier B output | Electrically isolated output stage; no crosstalk beyond specified channel separation |
| 8 (OUT D) | Amplifier D output | Final channel output; pin-compatible with industry-standard quad op amp layouts |
| 9 (–IN D) | Inverting input D | Fourth independent input; validated matching to A/B/C per datasheet Note 7 |
| 10 (V−) | Negative supply | Accepts 0 V (single supply) or –15 V; defines output swing lower bound |
| 11 (+IN C) | Noninverting input C | Third channel noninverting input; part of A/D and B/C matched pairs |
| 12 (–IN C) | Inverting input C | Third channel inverting input; supports precision 3-channel signal conditioning |
| 13 (OUT C) | Amplifier C output | Third output; fully characterized for settling time and load regulation |
| 14 (NC) | No connect | Not internally bonded; must remain unconnected per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| Picoampere input bias current | Enables direct interfacing with high-impedance sensors (e.g., pH electrodes, photodiodes) without guard-driven PCB traces |
| Rail-to-rail output swing | Delivers full 4.96 Vpp output range from 5 V single supply, maximizing ADC utilization in portable data loggers |
| Matched quad architecture | Guarantees ≤125 µV offset match between A/D and B/C pairs for accurate multi-channel differential measurements |
| Low 0.8 µV/°C offset drift | Maintains calibration stability across industrial temperature range without active compensation circuitry |
| 1 mA per amplifier supply current | Supports four-channel precision amplification in sub-10 mA total system power budget for battery-operated medical devices |
Applications
| Thermocouple Amplifiers | Bridge Transducer Conditioners |
|---|---|
Use Scenario: Amplifying µV-level thermocouple outputs (e.g., Type K) in industrial furnace controllers with cold-junction compensation. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with ultra-low input bias current to prevent thermocouple wire impedance errors. Use Value: 50 µV max offset and 0.8 µV/°C drift ensure <±1°C measurement accuracy over –40°C to 85°C ambient without recalibration. | Use Scenario: Conditioning Wheatstone bridge outputs from strain gauges in structural health monitoring systems. IC Role / Device Role / Timing Role: Instrumentation-grade front-end amplifier with matched quad topology for ratiometric bridge excitation and differential readout. Use Value: ≤125 µV offset match between channels enables simultaneous excitation and sensing with <0.01% gain error across all four bridge arms. |
| Precision Integrators | Battery-Powered Systems |
Use Scenario: Building analog integrators for charge accumulation in radiation dosimeters or electrochemical sensors. IC Role / Device Role / Timing Role: Low-drift integrator core with rail-to-rail output to maximize integration range before saturation. Use Value: 400 pA max input bias current limits integration error to <1.5 nC/hour, enabling >100-hour continuous measurement intervals. | Use Scenario: Signal conditioning in handheld multimeters or portable gas analyzers powered by two AA cells (3 V). IC Role / Device Role / Timing Role: Quad-channel analog front end handling AC/DC voltage, current, resistance, and temperature inputs. Use Value: 1.4 mA max per amplifier at 3 V supply allows full 4-channel operation within 6 mA total, extending battery life to >200 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2050CS8#PBF | Zero-drift architecture; 3 µV max offset vs. 50 µV; higher 1.5 MHz GBW but 1.2 mA supply current | Better DC accuracy for µV-level signals; less suitable for wideband AC-coupled applications due to chopper noise | Select LTC2050CS8#PBF when offset voltage dominates error budget; retain LT1885CS#PBF for balanced AC/DC performance with lower quiescent power |
| OPA2188AIDR | Single-supply rail-to-rail output; 25 µV max offset; 1.2 µV/°C drift; 1.2 mA supply current; only dual-channel | Superior drift spec but lacks quad configuration; requires two ICs to replace LT1885CS#PBF's four channels | Choose OPA2188AIDR for highest DC precision in dual-channel designs; prefer LT1885CS#PBF when board space and channel count constrain component count |
Compared with LTC2050CS8#PBF and OPA2188AIDR, LT1885CS#PBF uniquely delivers quad-channel precision, picoampere input bias, and 1 V/µs slew rate within 1.4 mA per amplifier-making it optimal for space-constrained, multi-sensor systems requiring both low-frequency accuracy and moderate bandwidth.
Availability
LT1885CS#PBF is available at Aetrix Electronics and suitable for thermocouple amplifiers, bridge transducer conditioners, precision integrators, battery-powered systems, and photo current amplifiers requiring stable component supply across industrial and medical OEM programs.
Supply support for LT1885CS#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio with rigorous qualification standards for industrial and automotive applications.
The LT1885CS#PBF belongs to Linear's rail-to-rail output precision op amp family, designed specifically for low-voltage, low-power instrumentation where picoampere input bias and sub-100 µV offset must coexist with robust output drive capability.
FAQ
What is the maximum operating supply voltage for LT1885CS#PBF?
The LT1885CS#PBF supports a total supply voltage range of 2.7 V to 36 V for single supply operation, or ±1.35 V to ±15 V for split supplies. Absolute maximum rating is 40 V between V+ and V− pins. Exceeding this risks permanent damage, and operation above 36 V violates the fully specified performance envelope defined in the datasheet.
Does LT1885CS#PBF have rail-to-rail input capability?
No, LT1885CS#PBF does not feature rail-to-rail input. Its input common-mode voltage range is specified as VEE + 1.2 V to VCC – 1.2 V under full temperature conditions. Applying signals outside this range causes gain collapse without reversal-verified in Electrical Characteristics Table on page 3 of the datasheet.
What is the guaranteed offset voltage match between amplifier pairs in LT1885CS#PBF?
Per datasheet Note 7 and Electrical Characteristics table on page 4, LT1885CS#PBF guarantees ≤125 µV offset voltage match between amplifiers A and D, and between B and C, over –40°C to 85°C. This matching is critical for differential applications like instrumentation amplifiers and ratiometric bridge readouts.
Can LT1885CS#PBF drive a 1000 pF capacitive load?
No-LT1885CS#PBF is characterized to drive up to 300 pF at unity gain. Driving 1000 pF causes instability and ringing, as shown in Gain vs Frequency vs CLOAD plots (Figures G18–G19). For larger loads, add a 10–50 Ω isolation resistor in series with the output, or reduce closed-loop gain to improve phase margin.
Is LT1885CS#PBF pin-compatible with other 14-lead SOIC quad op amps?
Yes, LT1885CS#PBF uses the industry-standard 14-lead SOIC pinout for quad op amps (e.g., LM324, TL084), with OUT A on Pin 1 and V− on Pin 10. However, its input bias current (400 pA) and offset voltage (50 µV) are significantly superior-requiring updated layout practices like guard rings and low-leakage PCB materials to realize full performance.
LT1885CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 2.2 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 150 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 850µA (x4 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1885CS#PBF FAQ
1.How can I place an order for LT1885CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1885CS#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1885CS#PBF reliable?
The price and inventory of LT1885CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1885CS#PBF is usually 5 days.
3.What payment methods are accepted for LT1885CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1885CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1885CS#PBF?
LT1885CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1885CS#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1885CS#PBF?
For technical support, including LT1885CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1885CS#PBF requirements.
6.How does Aetrix verify that LT1885CS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1885CS#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1885CS#PBF meets industry standards.
7.What is the process for return or replacement of LT1885CS#PBF?
All LT1885CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1885CS#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1885CS#PBF part is unused and in its original packaging.
Return procedure for LT1885CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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