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Analog Devices Inc. LT1991CMS#PBF
- Part No.:
- LT1991CMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1991CMS#PBF.pdf
- Description:
- IC OPAMP PGA 1 CIRCUIT 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:441
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Product details
Overview
LT1991CMS#PBF from Analog Devices (formerly Linear Technology) is a precision gain-selectable amplifier IC integrating eight matched thin-film resistors and a low-offset op amp in a single 10-lead MSOP package. It delivers gain accuracy of ±0.08% 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 as a configurable difference amplifier in medical instrumentation and strain gauge signal conditioning.
For engineers reviewing the LT1991CMS#PBF datasheet, LT1991CMS#PBF pinout, LT1991CMS#PBF application, or LT1991CMS#PBF equivalent, key selection considerations include its guaranteed 0.04% resistor matching over temperature, CMRR >75dB at G=1, input offset voltage ≤100µV (max), and support for difference, inverting, and noninverting configurations without external components.
Technical Context
The LT1991CMS#PBF implements a monolithic difference amplifier architecture with internal 450kΩ, 150kΩ, and 50kΩ SiChrome resistors-matched to 0.04% (LT1991A grade) or 0.08% (standard LT1991). Its op amp core features 50µV max input offset voltage, 100µA supply current at 5V, and stable operation into ≥100pF capacitive loads at noise gains <2.
Pin-configurable gain ranges span –13 to 14 (inverting), 0.07 to 14 (noninverting), and 1 to 13 (difference), with gain drift limited to 3ppm/°C and input voltage range extending to –0.5V to 5.1V on 5V supply. The device is specified across 0°C to 70°C for the CMS package variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.08% at G=1 (VS = ±15V, VOUT = ±10V); enables high-precision differential measurement without calibration. |
| CMRR | ≥75dB at G=1 (VS = ±15V, VCM = ±15.2V); rejects common-mode interference in noisy industrial environments. |
| Input Offset Voltage | ≤100µV max (LT1991MS, TA = 25°C); ensures sub-mV DC error in sensor front-ends. |
| Supply Current | 100µA typical at 5V supply; supports battery-powered handheld instrumentation. |
| Output Swing | Within 40mV of either rail (no load, VS = 5V); maximizes dynamic range in single-supply systems. |
| GBW Product | 560kHz; supports accurate amplification of low-frequency sensor signals up to ~100kHz at G=1. |
| Operating Temp | 0°C to 70°C (C-grade); qualified for commercial and light industrial ambient conditions. |
| Package | 10-Lead Plastic MSOP (LTQD); 3mm × 3mm footprint with exposed pad for thermal management. |
Pinout & Package
LT1991CMS#PBF uses a 10-lead plastic MSOP package (LTQD) with exposed pad connected to VEE. Pin functions are fixed and internally routed to precision resistors and op amp terminals.
| 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 in difference configuration. |
| P3 (Pin 2) | Noninverting Gain-of-3 Input | Connects 150kΩ resistor to op amp noninverting input; enables G=3 differential or noninverting mode. |
| P9 (Pin 3) | Noninverting Gain-of-9 Input | Connects 50kΩ resistor to op amp noninverting input; supports high-gain differential sensing. |
| VEE (Pin 4) | Negative Power Supply | Accepts ground or negative rail; defines lower supply boundary for rail-to-rail output swing. |
| 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 | Delivers 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 above VEE; powers op amp and internal resistor network. |
| M9 (Pin 8) | Inverting Gain-of-9 Input | Connects 50kΩ resistor to op amp inverting input; pairs with P9 for G=9 differential gain. |
| M3 (Pin 9) | Inverting Gain-of-3 Input | Connects 150kΩ resistor to op amp inverting input; pairs with P3 for G=3 differential gain. |
| M1 (Pin 10) | Inverting Gain-of-1 Input | Connects 450kΩ resistor to op amp inverting input; pairs with P1 for G=1 difference amplifier. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings to within 40mV of VCC or VEE under no load, preserving full-scale ADC input range in single-supply systems. |
| Configurable gain topology | Supports difference (G=1–13), inverting (G=–0.08 to –13), and noninverting (G=0.07–14) modes using only pin wiring-no external resistors required. |
| Matched resistor network | Internal 450kΩ, 150kΩ, and 50kΩ SiChrome resistors matched to 0.04% (LT1991A) or 0.08% (LT1991), enabling CMRR >75dB without trimming. |
| Low-power precision | 100µA supply current at 5V with 50µV typical input offset voltage-ideal for portable, low-noise analog front-ends. |
| Wide supply range | Operates from 2.7V single supply to ±18V split supply, simplifying design across battery, industrial, and lab equipment platforms. |
| High-voltage input tolerance | P1/M1 inputs withstand ±60V (with P9/M9 grounded and VS = ±15V), supporting isolated sensor interfaces without external protection. |
Applications
| Medical Instrumentation | Strain Gauge Amplifiers |
|---|---|
Use Scenario: Amplifying low-level biopotential signals (e.g., ECG, EMG) in portable patient monitors with strict power and size constraints. IC Role / Device Role / Timing Role: Precision difference amplifier configured at G=1000 to extract µV-level differential signals from electrode pairs while rejecting 50/60Hz common-mode noise. Use Value: 75dB+ CMRR and 100µV max VOS ensure diagnostic-grade signal fidelity without post-acquisition correction. | Use Scenario: Conditioning Wheatstone bridge outputs from load cells and pressure sensors in industrial weighing systems. IC Role / Device Role / Timing Role: Difference amplifier with REF pin tied to mid-supply, converting bridge imbalance into single-ended output referenced to system ground. Use Value: 0.08% gain error and 3ppm/°C drift maintain calibration stability across 0–70°C operating range. |
| Handheld Instrumentation | Differential to Single-Ended Conversion |
Use Scenario: Signal chain front-end in battery-powered multimeters and data loggers requiring low quiescent current and high DC accuracy. IC Role / Device Role / Timing Role: Noninverting amplifier (G=5.5) using P3/P9/REF pins to boost sensor output while preserving high input impedance (>600kΩ). Use Value: 100µA supply current extends battery life; rail-to-rail output drives 12-bit SAR ADCs directly. | Use Scenario: Interfacing differential-output sensors (e.g., MEMS accelerometers, LVDS sources) to single-ended ADCs or microcontrollers. IC Role / Device Role / Timing Role: Difference amplifier with REF = VCC/2, translating differential input to centered single-ended output compatible with unipolar ADC reference. Use Value: Matched internal resistors eliminate external matching errors, ensuring <0.1% gain mismatch between channels. |
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=5, 125µV max VOS, 1200kHz GBW, SO-8 package; no pin-selectable gain. | Requires external gain-setting resistor; less flexible for multi-gain systems. | Choose for higher bandwidth needs where fixed gain suffices and board space allows SO-8. |
| AD8271ARMZ | G=0.2 to 10, 350µV max VOS, 10MHz GBW, 8-lead MSOP; no internal REF pin. | Requires external reference; higher noise (11nV/√Hz vs 180nV/√Hz at G=1). | Choose for wideband applications needing >1MHz bandwidth and moderate DC precision. |
Compared with INA128UA and AD8271ARMZ, LT1991CMS#PBF offers unique pin-configurable gain without external components, superior resistor matching (0.08% vs ±0.1% typical), and integrated REF functionality-making it optimal for compact, multi-range sensor signal chains where layout simplicity and DC accuracy are critical.
Availability
LT1991CMS#PBF is available at Aetrix Electronics and suitable for medical instrumentation, handheld test equipment, and industrial sensor interface designs requiring stable component supply, long-term manufacturability, and C-grade temperature performance.
Supply support for LT1991CMS#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1991 belongs to ADI's precision amplifier product line, designed specifically for applications demanding high DC accuracy, low power, and configurability in compact form factors-targeting sensor signal conditioning, portable instrumentation, and industrial measurement systems.
FAQ
What is the maximum input voltage range for LT1991CMS#PBF on a 5V supply?
On a 5V single supply (VCC = 5V, VEE = 0V) with VREF = 2.5V, the P1/M1 inputs support –0.5V to 5.1V. When P9/M9 are connected to REF, the extended range is –14V to 16.8V. These limits are defined by internal op amp headroom and resistor network constraints-not absolute maximum ratings-and assume proper feedback configuration.
Does LT1991CMS#PBF require external resistors to set gain?
No, LT1991CMS#PBF does not require external resistors to set gain. Its internal precision-matched 450kΩ, 150kΩ, and 50kΩ resistors enable pin-configurable gains from –13 to 14 in difference, inverting, and noninverting topologies. External components are optional only for fine-tuning or custom gain ratios outside standard configurations.
What is the guaranteed common-mode rejection ratio (CMRR) for LT1991CMS#PBF?
The LT1991CMS#PBF guarantees CMRR ≥75dB at G = 1 (VS = ±15V, VCM = ±15.2V), and ≥70dB at G = 3 or G = 9. This performance stems from 0.08% internal resistor matching and is fully specified across the 0°C to 70°C operating temperature range for the CMS package variant.
Can LT1991CMS#PBF operate from a single 3V supply?
Yes, LT1991CMS#PBF operates from a minimum supply voltage of 2.7V. On a 3V supply (VCC = 3V, VEE = 0V), its output swings to within 65mV of each rail under no load, and input common-mode range is 0.75V to 2.35V (P1/M1) or –1.5V to 7.3V (P1/M1 with P9/M9 tied to REF), enabling use in ultra-low-voltage portable systems.
How is the reference voltage (REF pin) used in LT1991CMS#PBF difference amplifier mode?
In difference amplifier mode, the REF pin sets the output DC level when the differential input is zero: VOUT = VREF + ∆VIN × G. It connects internally to a 450kΩ resistor and can be driven by a stable voltage source (e.g., bandgap reference or DAC output) to establish precise output offset-critical for interfacing with unipolar ADCs or level-shifting requirements.
LT1991CMS#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT1991CMS#PBF FAQ
1.How can I place an order for LT1991CMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1991CMS#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 LT1991CMS#PBF reliable?
The price and inventory of LT1991CMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1991CMS#PBF is usually 5 days.
3.What payment methods are accepted for LT1991CMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1991CMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1991CMS#PBF?
LT1991CMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1991CMS#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 LT1991CMS#PBF?
For technical support, including LT1991CMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1991CMS#PBF requirements.
6.How does Aetrix verify that LT1991CMS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1991CMS#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 LT1991CMS#PBF meets industry standards.
7.What is the process for return or replacement of LT1991CMS#PBF?
All LT1991CMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1991CMS#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 LT1991CMS#PBF part is unused and in its original packaging.
Return procedure for LT1991CMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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