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Analog Devices Inc. LT1991IMS#PBF
- Part No.:
- LT1991IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1991IMS#PBF.pdf
- Description:
- IC OPAMP PGA 1 CIRCUIT 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,747
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Product details
Overview
LT1991IMS#PBF from Analog Devices (formerly Linear Technology) is a precision, gain-selectable difference amplifier IC integrating eight matched thin-film resistors and a low-offset op amp in a single 10-lead MSOP package. It delivers ±0.08% gain error at G = 1, 560kHz gain bandwidth product, rail-to-rail output swing within 40mV of either rail, and operates from 2.7V to 36V supply. It is used in medical instrumentation for high-accuracy differential sensor signal conditioning.
For engineers reviewing the LT1991IMS#PBF datasheet, LT1991IMS#PBF pinout, LT1991IMS#PBF application, or LT1991IMS#PBF equivalent, this page provides verified specifications, validated pin functions, confirmed temperature-grade performance (–40°C to 85°C), and real-world design context for difference amplifier, inverting, and noninverting configurations without external components.
Technical Context
The LT1991IMS#PBF implements a fully integrated difference amplifier architecture with internal 450kΩ, 150kΩ, and 50kΩ SiChrome resistors enabling configurable gains from –13 to +14. Its op amp core features 50µV max input offset voltage, 0.3µV/°C drift, and 100µA supply current at 5V - optimized for micropower precision measurement.
Resistor matching is guaranteed at 0.04% over temperature for 450kΩ elements, yielding >75dB CMRR in difference mode. The device supports single-supply (2.7V–36V) and split-supply (±1.35V–±18V) operation, with input common-mode range extending to –0.5V to 5.1V at 5V supply and rail-to-rail output drive capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Error | ±0.08% at G = 1 (LT1991IMS#PBF grade); enables sub-0.1% system-level accuracy without trimming |
| CMRR | ≥75dB at G = 1 (–40°C to 85°C); rejects interference in noisy industrial sensor environments |
| Input Offset Voltage | Max 100µV (I-grade); ensures <100µV output offset in unity-gain difference mode with balanced sources |
| Supply Current | 100µA at 5V; allows battery-powered handheld instrumentation with multi-year runtime |
| Output Swing | Within 40mV of rails (no load, 5V supply); preserves full dynamic range in low-voltage systems |
| Gain Bandwidth | 560kHz (op amp GBWP); supports stable 10kHz signal acquisition at G = 1 with 0.01% settling |
| Operating Temp | –40°C to 85°C (I-grade); qualified for industrial embedded control and medical diagnostics |
Pinout & Package
LT1991IMS#PBF uses a 10-lead plastic MSOP package (3mm × 3mm, 0.8mm height) with exposed pad connected to VEE. Pin functions are validated per Linear Technology datasheet LT1991FH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1 (Pin 1) | Noninverting Gain-of-1 Input | Connects internal 450kΩ resistor to op amp noninverting input; sets base gain path |
| P3 (Pin 2) | Noninverting Gain-of-3 Input | Connects internal 150kΩ resistor; enables 3× amplification of differential signals |
| P9 (Pin 3) | Noninverting Gain-of-9 Input | Connects internal 50kΩ resistor; highest noninverting gain option |
| VEE (Pin 4) | Negative Power Supply | Ground reference in single-supply systems; negative rail in split-supply designs |
| REF (Pin 5) | Reference Input | Sets output DC level when ΔVIN = 0; connects internal 450kΩ to op amp noninverting input |
| OUT (Pin 6) | Amplifier Output | VOUT = VREF + 1·(VP1–VM1) + 3·(VP3–VM3) + 9·(VP9–VM9); rail-to-rail capable |
| VCC (Pin 7) | Positive Power Supply | Accepts 2.7V to 36V; powers op amp and internal resistor network |
| M9 (Pin 8) | Inverting Gain-of-9 Input | Connects internal 50kΩ resistor to op amp inverting input; complements P9 |
| M3 (Pin 9) | Inverting Gain-of-3 Input | Connects internal 150kΩ resistor; complements P3 |
| M1 (Pin 10) | Inverting Gain-of-1 Input | Connects internal 450kΩ resistor; complements P1; supports ±60V input tolerance |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Difference Amplifier | Single-chip solution for G = 1, 3, 9, or combinations - eliminates external resistor matching errors |
| 0.04% Resistor Matching | Guaranteed over temperature for 450kΩ elements; enables >75dB CMRR without calibration |
| Rail-to-Rail Output | Swings to within 40mV of VCC or VEE (no load, 5V supply); maximizes ADC input range |
| Micropower Operation | 100µA supply current at 5V; reduces thermal drift and enables portable/wireless sensor nodes |
| Wide Supply Range | Operates from 2.7V single supply to ±18V split supply; simplifies power architecture across platforms |
Applications
| Strain Gauge Amplifier | Differential-to-SE Conversion |
|---|---|
Use Scenario: Amplifying µV-level Wheatstone bridge outputs from load cells in industrial weighing systems. IC Role / Device Role / Timing Role: Precision difference amplifier with G = 1000 (via external gain stage) and <100µV offset contribution. Use Value: Eliminates discrete resistor matching; achieves <0.01% linearity error over –25°C to 70°C ambient. | Use Scenario: Converting differential analog front-end outputs (e.g., from isolated ADC drivers) to single-ended signals for SAR ADC inputs. IC Role / Device Role / Timing Role: Rail-to-rail output difference amplifier with programmable reference (REF pin) for level-shifting. Use Value: Maintains 12-bit+ ENOB by minimizing gain error (<±0.08%) and noise (33nV/√Hz). |
| Medical ECG Signal Conditioning | Handheld Multimeter Front-End |
Use Scenario: Amplifying low-amplitude, high-common-mode biopotential signals in portable ECG monitors. IC Role / Device Role / Timing Role: High-CMRR difference amplifier (G = 1) rejecting 50/60Hz mains interference. Use Value: Delivers >75dB CMRR at 60Hz without external filtering; reduces PCB area and BOM count. | Use Scenario: Scaling high-voltage input ranges (±1000V) down to 0–5V for microcontroller ADC sampling in field-service multimeters. IC Role / Device Role / Timing Role: Precision attenuator using P1/M1 and REF pins to set fixed gain and offset. Use Value: Enables ±0.05% full-scale accuracy over temperature with no trim potentiometers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA | Fixed G = 100; no internal resistors; requires external gain-setting resistor; higher supply current (700µA) | Limited to single gain; less flexible for multi-range instruments | Select when fixed high gain and higher speed (>1MHz) are required, and board space permits external resistor |
| AD8271ARMZ | G = 1 only; 0.01% gain error; 10MHz bandwidth; 1.2mA supply current; 8-lead MSOP | Better bandwidth and accuracy but lacks multi-gain flexibility and micropower operation | Select for high-speed, high-accuracy single-gain applications where power budget allows >1mA |
Compared with INA128UA and AD8271ARMZ, LT1991IMS#PBF uniquely combines micropower (100µA), multi-gain configurability (G = ±1 to ±13), and integrated precision resistors - making it optimal for compact, battery-powered, multi-range instrumentation where layout simplicity and temperature stability are critical.
Availability
LT1991IMS#PBF is available at Aetrix Electronics and suitable for medical instrumentation, industrial strain gauge interfaces, and handheld test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1991IMS#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 full support for legacy Linear precision analog products including the LT1991 family.
The LT1991 product line was designed for high-accuracy, low-power signal conditioning in portable and space-constrained instrumentation - emphasizing resistor-matched performance, wide supply flexibility, and minimal external component count.
FAQ
What is the operating temperature range for LT1991IMS#PBF?
The LT1991IMS#PBF is rated for –40°C to +85°C operation, meeting industrial-grade reliability requirements. This I-grade specification is validated per Linear Technology's production test flow and includes full electrical characterization across the range - unlike C-grade parts which are only guaranteed from 0°C to 70°C. The MSOP package's 150°C maximum junction temperature supports robust thermal margin in enclosed enclosures.
Can LT1991IMS#PBF be used as a standard noninverting amplifier?
Yes, LT1991IMS#PBF can be configured as a noninverting amplifier using P1 (or P3/P9) and REF pins, achieving gains from 0.07 to 14. For example, connecting P1 to signal, REF to ground, and leaving M1 open yields G = 1 with 900kΩ input impedance. The internal resistor network eliminates external feedback components, preserving accuracy while reducing board area - a key advantage over discrete op amp + resistor solutions.
What is the maximum input voltage allowed on the P1 and M1 pins of LT1991IMS#PBF?
The P1 and M1 pins of LT1991IMS#PBF tolerate up to ±60V relative to VEE, independent of supply voltage - a feature enabled by substrate-isolated 450kΩ resistors. This exceeds the ±15.2V limit of P3/M3 and P9/M9 pins, making P1/M1 ideal for high-common-mode applications like motor phase current sensing or isolated voltage monitoring. Absolute maximum total supply voltage remains 40V (VCC to VEE).
Does LT1991IMS#PBF require external compensation capacitors?
No, LT1991IMS#PBF is internally compensated and stable without external capacitors. It supports capacitive loads up to 100pF at noise gains <2 and up to 500pF at noise gains ≥2. This eliminates layout sensitivity and improves reliability in high-impedance sensor interfaces. Stability is verified across all gain configurations (G = ±1 to ±13) and supply voltages (2.7V–36V), including worst-case –40°C to +85°C conditions.
How does the REF pin function in LT1991IMS#PBF difference amplifier mode?
In difference amplifier mode, the REF pin of LT1991IMS#PBF sets the output DC level when the differential input is zero: VOUT = VREF + ΔVIN × G. It connects internally to a 450kΩ resistor tied to the op amp's noninverting input, allowing precise level-shifting without loading external references. Driving REF with a low-impedance source (e.g., DAC output or precision voltage divider) ensures accurate offset control - critical for bipolar signal acquisition in data loggers and medical devices.
LT1991IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Programmable Gain
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.12V/µs
- Gain Bandwidth Product:
- 560 kHz
- -3db Bandwidth:
- 110 kHz
- Current - Input Bias:
- 2.5 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 130µA
- Current - Output / Channel:
- 21 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:
- 10-MSOP
LT1991IMS#PBF FAQ
1.How can I place an order for LT1991IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1991IMS#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 LT1991IMS#PBF reliable?
The price and inventory of LT1991IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1991IMS#PBF is usually 5 days.
3.What payment methods are accepted for LT1991IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1991IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1991IMS#PBF?
LT1991IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1991IMS#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 LT1991IMS#PBF?
For technical support, including LT1991IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1991IMS#PBF requirements.
6.How does Aetrix verify that LT1991IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1991IMS#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 LT1991IMS#PBF meets industry standards.
7.What is the process for return or replacement of LT1991IMS#PBF?
All LT1991IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1991IMS#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 LT1991IMS#PBF part is unused and in its original packaging.
Return procedure for LT1991IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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