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Analog Devices Inc. LT1885IS#PBF
- Part No.:
- LT1885IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1885IS#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:823
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Product details
Overview
LT1885IS#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 to 36V total supply, delivering 40 mV low-side and 220 mV high-side output swing into light loads - ideal for thermocouple amplification and battery-powered instrumentation.
For engineers reviewing the LT1885IS#PBF datasheet, LT1885IS#PBF pinout, LT1885IS#PBF application, or LT1885IS#PBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, matched amplifier performance across all four channels, ultra-low input bias current stability over temperature, and compatibility with single-supply sensor signal conditioning circuits requiring <100 µV total error budget.
Technical Context
The LT1885IS#PBF implements a bipolar input stage with on-chip bias current cancellation, yielding uncorrelated IB+ and IB– and enabling high-impedance source interfacing without input resistor balancing. Its rail-to-rail output stage uses complementary common-emitter drivers to achieve 220 mV headroom at VCC and 40 mV at VEE under no load.
Gain-bandwidth product is 2 MHz (typical) with 0.01% settling in 10 µs (AV = –1, RL = 2 kΩ), and open-loop voltage gain exceeds 350 V/mV at full temperature range - supporting stable closed-loop operation in precision integrators and current sources where DC accuracy and AC fidelity are both critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 50 µV max (LT1884A grade, 0°C to 70°C); ensures ≤100 µV system-level DC error in 20-bit DAC buffer applications |
| Input Bias Current | 400 pA max (LT1884A grade); enables use with >100 MΩ feedback networks without significant drift-induced gain error |
| Supply Voltage Range | ±1.35V to ±15V or 2.7V to 36V; supports direct interface with 3.3V/5V microcontrollers and legacy ±15V industrial rails |
| Output Swing (No Load) | VOL = 40 mV above VEE, VOH = 220 mV below VCC; delivers >98% of full-scale range in single-supply 5V systems |
| Slew Rate | 1 V/µs (typical); settles 2 V step within 10 µs at 0.01%, sufficient for 100 kHz sinusoidal output with <0.1% THD |
| Offset Voltage Drift | 0.8 µV/°C max; contributes <64 µV error over –40°C to +85°C ambient, critical for uncalibrated field instruments |
| Common-Mode Rejection | 106 dB min (full temp range); rejects ≥200 µV of CM noise per volt of common-mode shift in bridge transducer interfaces |
Pinout & Package
LT1885IS#PBF is housed in a 14-lead plastic SO (narrow 0.150") package (S package), JEDEC MS-012AC compliant, with θJA = 110°C/W. Pin 1 is marked with dot or bevel; device is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load; rail-to-rail swing referenced to V+ and V–; requires local 0.1 µF decoupling |
| 2 (–IN A) | Inverting input A | High-impedance node; guard ring routing recommended to minimize leakage-induced offset |
| 3 (+IN A) | Noninverting input A | High-impedance node; matches –IN A in offset and bias current; avoid asymmetric PCB traces |
| 4 (V+) | Positive supply | Accepts up to +36V or +15V; connect to low-ESR ceramic capacitor near pin |
| 5 (+IN B) | Noninverting input B | Electrically identical to +IN A; channel matching specified as ∆VOS ≤ 125 µV (–40°C to +85°C) |
| 6 (–IN B) | Inverting input B | Electrically identical to –IN A; used for dual-channel instrumentation front-end configurations |
| 7 (OUT B) | Amplifier B output | Independent output; shares V+ and V– with other channels; no crosstalk >100 dB at 1 kHz |
| 8 (OUT D) | Amplifier D output | Fourth output; pin 8 is OUT D (not ground); layout symmetry critical for quad-channel matching |
| 9 (–IN D) | Inverting input D | Matches –IN A/B/C; ∆IB+ match ≤ 700 pA (LT1884A grade) ensures consistent high-Z feedback behavior |
| 10 (+IN D) | Noninverting input D | Final input pair; used in 4-channel transducer conditioners where all channels must track identically |
| 11 (V–) | Negative supply | Accepts down to –36V or –15V; return path for all four amplifiers; star-ground connection required |
| 12 (+IN C) | Noninverting input C | Third channel noninverting input; pin order follows standard quad SO convention (A,B,D,C) |
| 13 (–IN C) | Inverting input C | Third channel inverting input; matches A/B/D for multi-channel synchronous sampling |
| 14 (OUT C) | Amplifier C output | Third output; completes quad set; pin 14 is OUT C - verify orientation via package marking dot |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers usable dynamic range within 40 mV of V– and 220 mV of V+ - eliminates need for level-shifting in 3.3V/5V data acquisition |
| Picoampere input bias current | 400 pA max (LT1884A) enables direct connection to high-Z pH electrodes, photodiodes, and piezoelectric sensors without guard-driven buffers |
| Guaranteed –40°C to +85°C performance | Full electrical specs validated across industrial temperature range - suitable for unheated outdoor instrumentation without derating |
| Matched quad architecture | Offset voltage match ≤125 µV and PSRR match ≤126 dB ensure uniform channel behavior in 4-channel analog front-ends |
| Low 0.8 µV/°C offset drift | Minimizes calibration frequency in portable test equipment; maintains <1 LSB error in 16-bit systems over full temperature span |
Applications
| Thermocouple Amplifiers | Bridge Transducer Conditioners |
|---|---|
Use Scenario: Cold-junction compensation and linearization of K-type thermocouples in HVAC controllers. IC Role / Device Role / Timing Role: Primary gain stage with 100× fixed gain, rejecting common-mode noise from long sensor leads. Use Value: 50 µV max VOS and 0.8 µV/°C drift limit measurement uncertainty to ±0.3°C over –20°C to +70°C ambient. | Use Scenario: Signal conditioning for 350 Ω strain-gauge bridges in structural health monitoring nodes. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with matched LT1885IS#PBF channels implementing differential-to-single-ended conversion. Use Value: 106 dB CMRR and 125 µV max channel-to-channel VOS match enable 0.05% full-scale accuracy without trimming. |
| Precision Integrators | Battery-Powered Systems |
Use Scenario: Low-drift integrator in analog PID controllers for motor position regulation. IC Role / Device Role / Timing Role: Integrator core using 10 nF capacitor and 10 MΩ feedback resistor; LT1885IS#PBF provides low IB and VOS to minimize drift. Use Value: 400 pA max IB limits integrator drift to <1 µV/s, enabling >10-second integration windows without reset. | Use Scenario: Front-end amplifier for wearable ECG monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Single-supply 3.3V signal amplifier with rail-to-rail output driving 12-bit SAR ADC reference buffer. Use Value: 0.65 mA typical supply current per amplifier extends battery life to >72 hours; 40 mV VOL preserves 3.26 V effective input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2050CS6#TRMPBF | Zero-drift architecture; 3 µV max VOS, but 1.5 MHz GBW and 0.5 V/µs slew rate; higher supply current (1.5 mA) | Better DC accuracy for <1 ppm systems; lower bandwidth limits AC-coupled sensor use | Select LTC2050CS6#TRMPBF when VOS drift dominates error budget and signal bandwidth <100 kHz |
| OPA2189IDR | Zero-drift, 25 µV max VOS, 12 V/µs slew, 10 MHz GBW; 1.3 mA supply current; no guaranteed –40°C to +85°C match specs | Superior speed and noise performance; lacks quad-channel matching data across temperature | Select OPA2189IDR for high-speed precision applications requiring >1 MHz bandwidth and single/dual configuration only |
Compared with LTC2050CS6#TRMPBF and OPA2189IDR, LT1885IS#PBF uniquely balances picoampere input bias, guaranteed quad-channel matching, rail-to-rail output, and industrial temperature validation - making it optimal for multi-channel, low-power, high-impedance sensor systems where channel uniformity and supply flexibility are mandatory.
Availability
LT1885IS#PBF is available at Aetrix Electronics and suitable for thermocouple amplification, bridge transducer conditioning, and precision integrator designs requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1885IS#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement and control.
The LT1885IS#PBF belongs to Linear's precision rail-to-rail op amp family, engineered specifically for low-voltage, high-accuracy sensor signal chains in industrial, medical, and test equipment where input bias current, offset voltage, and channel matching directly impact measurement integrity.
FAQ
What is the operating temperature range guaranteed for LT1885IS#PBF?
The LT1885IS#PBF is specified and tested over the full industrial temperature range of –40°C to +85°C. Unlike commercial-grade variants (e.g., LT1885CS), the "I" suffix confirms guaranteed performance across this range, including input offset voltage, bias current, and channel matching parameters - critical for uncontrolled-environment deployments.
Does LT1885IS#PBF support true rail-to-rail input operation?
No, LT1885IS#PBF does not feature rail-to-rail input. Its input common-mode range is limited to VEE + 1.2 V to VCC – 1.2 V (guaranteed). While the output swings rail-to-rail, the input stage requires at least 1.2 V headroom from each supply - a key constraint when interfacing with 0 V–referenced sensors in single-supply configurations.
Can LT1885IS#PBF drive capacitive loads without instability?
Yes, LT1885IS#PBF can drive up to 300 pF in unity-gain configuration without external compensation. For loads exceeding 300 pF or in higher-gain configurations, a small series resistor (e.g., 10–50 Ω) between output and capacitance restores phase margin. Stability is verified per Figure 19 in the datasheet across CLOAD = 0–500 pF.
How does LT1885IS#PBF handle input overvoltage conditions?
LT1885IS#PBF includes internal back-to-back diodes on inputs, rated for ±10 V differential voltage. Sustained differential voltages beyond ±10 V require external current-limiting resistors (e.g., 1 kΩ per input) to prevent damage. Absolute maximum ratings specify ±10 V differential input and ±10 mA input current - exceeding either risks permanent degradation.
Is LT1885IS#PBF pin-compatible with other quad op amps in SO-14 packages?
LT1885IS#PBF uses a standard SO-14 pinout for quad op amps (per JEDEC MS-012AC), matching pin functions of industry-standard devices like LM324 and TL084. However, its bipolar input architecture, rail-to-rail output, and picoampere bias current differ significantly - direct replacement requires verification of supply range, input common-mode limits, and load drive capability.
LT1885IS#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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LT1885IS#PBF FAQ
1.How can I place an order for LT1885IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1885IS#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 LT1885IS#PBF reliable?
The price and inventory of LT1885IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1885IS#PBF is usually 5 days.
3.What payment methods are accepted for LT1885IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1885IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1885IS#PBF?
LT1885IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1885IS#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 LT1885IS#PBF?
For technical support, including LT1885IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1885IS#PBF requirements.
6.How does Aetrix verify that LT1885IS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1885IS#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 LT1885IS#PBF meets industry standards.
7.What is the process for return or replacement of LT1885IS#PBF?
All LT1885IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1885IS#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 LT1885IS#PBF part is unused and in its original packaging.
Return procedure for LT1885IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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