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Analog Devices Inc. LT1991IMS#TRPBF
- Part No.:
- LT1991IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1991IMS#TRPBF.pdf
- Description:
- IC OPAMP PGA 1 CIRCUIT 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,208
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Product details
Overview
LT1991IMS#TRPBF 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 rails, and operates from 2.7V to 36V supply. It is used in strain gauge signal conditioning and medical instrumentation where high CMRR (>75dB) and micropower (100µA) are critical.
For engineers reviewing the LT1991IMS#TRPBF datasheet, LT1991IMS#TRPBF pinout, LT1991IMS#TRPBF application, or LT1991IMS#TRPBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, resistor matching <0.08%, input offset voltage ≤100µV, and configurable gains from –13 to +14 without external components.
Technical Context
The LT1991IMS#TRPBF implements a fully integrated difference amplifier architecture with internal 50kΩ, 150kΩ, and dual 450kΩ SiChrome resistors enabling precise gain configurations (G = ±1, ±3, ±9, ±13, etc.) via pin-strapping. Its op amp core features 50µV max input offset voltage and 0.3µV/°C drift, referenced to the internal amplifier node.
Resistor matching is guaranteed at 0.08% over temperature for standard grade, with <3ppm/°C matching TC and <10ppm gain nonlinearity. 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 VREF = 2.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Error | ±0.08% at G = 1 (LT1991IMS grade), enabling accurate differential measurement without calibration. |
| CMRR | ≥75dB at G = 1 (referred to inputs), rejecting common-mode noise in noisy industrial environments. |
| Supply Current | 100µA at 5V supply, supporting battery-powered handheld instrumentation. |
| Output Swing | Within 40mV of either rail (no load, 5V supply), maximizing dynamic range in low-voltage systems. |
| Input Offset Voltage | ≤100µV (max, I-grade), reducing DC error in precision sensor front-ends. |
| Gain Bandwidth | 560kHz (op amp GBWP), supporting stable amplification up to ~110kHz at G = 1. |
| Operating Temp | –40°C to +85°C, qualified for industrial embedded and medical applications. |
| Package | 10-lead MSOP (3mm × 3mm, 0.8mm height), compatible with automated SMT assembly. |
Pinout & Package
LT1991IMS#TRPBF uses a 10-lead plastic MSOP package (LTQD marking) with exposed pad soldered to PCB ground. Pin functions are fixed per internal resistor network and op amp topology.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1 (Pin 1) | Noninverting Gain-of-1 Input | Connects 450kΩ resistor to op amp noninverting input; sets unity-gain path for differential pair. |
| P3 (Pin 2) | Noninverting Gain-of-3 Input | Connects 150kΩ resistor to op amp noninverting input; enables 3× differential gain contribution. |
| P9 (Pin 3) | Noninverting Gain-of-9 Input | Connects 50kΩ resistor to op amp noninverting input; provides 9× differential gain scaling. |
| VEE (Pin 4) | Negative Power Supply | Ground or negative rail; defines lower supply boundary for op amp and resistor network. |
| REF (Pin 5) | Reference Input | Sets output zero-differential level (VOUT = VREF when ∆VIN = 0); connects 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 | 2.7V to 36V above VEE; powers op amp and internal resistors. |
| M9 (Pin 8) | Inverting Gain-of-9 Input | Connects 50kΩ resistor to op amp inverting input; complements P9 for 9× differential gain. |
| M3 (Pin 9) | Inverting Gain-of-3 Input | Connects 150kΩ resistor to op amp inverting input; complements P3 for 3× differential gain. |
| M1 (Pin 10) | Inverting Gain-of-1 Input | Connects 450kΩ resistor to op amp inverting input; complements P1 for unity-gain differential path. |
Key Features
| Feature | Design Value |
|---|---|
| Precision resistor matching | 0.08% max matching (450kΩ resistors), enabling >75dB CMRR without trimming. |
| Rail-to-rail output | Swings to within 40mV of VCC or VEE (no load, 5V supply), preserving full-scale ADC input range. |
| Configurable gain architecture | Gains from –13 to +14 achieved by strapping P/M pins-no external resistors required. |
| Micropower operation | 100µA supply current at 5V enables multi-channel, low-power sensor arrays. |
| Wide supply range | Operates from 2.7V single supply to ±18V split supply, simplifying system power design. |
| Industrial temperature grade | Specified from –40°C to +85°C, suitable for uncontrolled environmental deployments. |
Applications
| Strain Gauge Amplifier | Differential-to-SE Conversion |
|---|---|
Use Scenario: Amplifying µV-level Wheatstone bridge outputs from load cells or pressure sensors in portable test equipment. IC Role / Device Role / Timing Role: Precision difference amplifier with programmable gain and low offset, directly interfacing bridge to 16-bit SAR ADC. Use Value: 0.08% gain error and 100µV offset ensure <0.1% full-scale measurement accuracy without factory calibration. | Use Scenario: Converting differential analog sensor outputs (e.g., isolated current sense, LVDS receiver) to single-ended signals for MCU ADC input. IC Role / Device Role / Timing Role: Rail-to-rail output difference amplifier with reference pin biasing, eliminating level-shifting circuitry. Use Value: 40mV rail-to-rail swing and 560kHz GBWP support fast, accurate digitization of 100kHz sensor waveforms. |
| Medical Instrumentation Front-End | Handheld Battery-Powered Instrumentation |
Use Scenario: Biopotential signal acquisition (ECG, EEG) requiring high CMRR and low noise in compact clinical devices. IC Role / Device Role / Timing Role: Low-noise, low-drift difference amplifier with matched resistors minimizing thermal EMF errors. Use Value: 75dB+ CMRR rejects 50/60Hz mains interference; 100µA quiescent current extends battery life in portable monitors. | Use Scenario: Multi-function handheld meters measuring voltage, current, and resistance with auto-ranging front-end. IC Role / Device Role / Timing Role: Reconfigurable gain amplifier supporting multiple measurement ranges using same PCB footprint. Use Value: Pin-strappable gains (±1, ±3, ±9) eliminate need for multiple op amp variants, reducing BOM count and inventory cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA128UA | Fixed G = 5, 10, 100; no pin-configurable gain; higher supply current (700µA); 125µV max VOS. | Requires external gain-setting resistor; less flexible for multi-range designs. | Choose for ultra-low noise (1nV/√Hz) in fixed-gain, high-precision lab equipment. |
| AD8276ARZ | G = 0.2 to 10.25; 0.05% gain error; 125µV max VOS; 1.2mA supply current; SOIC-8 package. | Lacks rail-to-rail output (clips 150mV from rails); not specified below –40°C. | Choose for higher bandwidth (1.5MHz) and better PSRR (100dB) in industrial PLC analog modules. |
Compared with INA128UA and AD8276ARZ, LT1991IMS#TRPBF offers unique pin-strappable gain flexibility, micropower operation, and rail-to-rail output in a space-saving MSOP-ideal for battery-powered, multi-range, and thermally constrained applications where layout area and power budget are critical.
Availability
LT1991IMS#TRPBF is available at Aetrix Electronics and suitable for strain gauge amplifiers, medical instrumentation front-ends, and handheld battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1991IMS#TRPBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017.
The LT1991IMS#TRPBF belongs to ADI's precision amplifier product line, designed specifically for applications demanding high accuracy, low power, and configurability in sensor signal conditioning-especially where board space, calibration overhead, and thermal stability are limiting factors.
FAQ
What is the maximum input common-mode voltage for LT1991IMS#TRPBF at 5V supply?
At 5V single supply with VREF = 2.5V, the LT1991IMS#TRPBF supports an input common-mode range of –0.5V to 5.1V on P1/M1 pins. This is validated per the datasheet's electrical characteristics table under "Input Voltage Range" for VS = 5V, 0V conditions. Exceeding these limits risks clipping or invalid operation.
Does LT1991IMS#TRPBF require external resistors to set gain?
No. LT1991IMS#TRPBF integrates eight precision-matched resistors (50kΩ, 150kΩ, 450kΩ) internally. Gain is set solely by connecting specific input pins (e.g., P1/M1 for G = 1, P3/M3 for G = 3). No external resistors are needed-enabling compact, calibration-free designs.
What is the guaranteed gain error specification for LT1991IMS#TRPBF?
The LT1991IMS#TRPBF has a guaranteed maximum gain error of ±0.08% at G = 1, as specified in the Electrical Characteristics table for I-grade parts under VS = ±15V, VOUT = ±10V, RL = 10kΩ conditions. This applies across its full –40°C to +85°C operating temperature range.
Can LT1991IMS#TRPBF operate from a 3V single supply?
Yes. LT1991IMS#TRPBF supports minimum supply voltage of 2.7V. At 3V supply with VREF = 1.25V, its input common-mode range is 0.75V to 2.35V (P1/M1), and output swings to within 65mV of rails (no load), making it suitable for low-voltage IoT sensor nodes.
Is the LT1991IMS#TRPBF pin-compatible with other grades like LT1991HMS#TRPBF?
Yes. All LT1991 MSOP variants-including LT1991IMS#TRPBF, LT1991HMS#TRPBF, and LT1991CMS#TRPBF-share identical 10-lead MSOP pinout, footprint, and pin functions. Only temperature grade and certain electrical parameters (e.g., max VOS, gain error) differ between grades.
LT1991IMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1991IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1991IMS#TRPBF 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#TRPBF reliable?
The price and inventory of LT1991IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1991IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1991IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1991IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1991IMS#TRPBF?
LT1991IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1991IMS#TRPBF 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#TRPBF?
For technical support, including LT1991IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1991IMS#TRPBF requirements.
6.How does Aetrix verify that LT1991IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1991IMS#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1991IMS#TRPBF?
All LT1991IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1991IMS#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1991IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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