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Analog Devices Inc. LT1991HDD#PBF
- Part No.:
- LT1991HDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT1991HDD#PBF.pdf
- Description:
- IC OPAMP PGA 1 CIRCUIT 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:187
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Product details
Overview
LT1991HDD#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 DFN package. It delivers ±0.08% max gain error at G=1, 75dB min CMRR, rail-to-rail output swing within 40mV of rails, 560kHz gain bandwidth product, and operates from 2.7V to 36V supply with only 100µA quiescent current. It is used in high-accuracy strain gauge signal conditioning and medical instrumentation front-ends.
For engineers reviewing the LT1991HDD#PBF datasheet, LT1991HDD#PBF pinout, LT1991HDD#PBF application, or LT1991HDD#PBF equivalent, key selection criteria include guaranteed –40°C to +125°C operation, 0.04% resistor matching over temperature, 50µV max input offset voltage, and configurable gain ranges from –13 to +14 without external components.
Technical Context
The LT1991HDD#PBF implements a fully integrated difference amplifier architecture where internal 450kΩ, 150kΩ, and 50kΩ SiChrome resistors enable precise gain configurations (G = ±1, ±3, ±9, ±13) via pin-strapping. Its op amp features rail-to-rail output, 560kHz GBWP, and input stage designed for high common-mode rejection despite non-rail-to-rail inputs.
Gain accuracy is maintained by <3ppm/°C resistor matching drift and <1µV/°C offset drift, while the 40mV output swing specification applies under no-load conditions at 5V supply. The device supports both single-supply (e.g., 5V/0V) and split-supply (±15V) operation across its full –40°C to +125°C rated temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 36V - supports wide industrial and automotive input rails without external regulation |
| Max Gain Error (G=1) | ±0.08% - enables 12-bit+ system accuracy without calibration |
| CMRR (G=1) | ≥70dB - rejects common-mode noise in noisy sensor environments |
| Input Offset Voltage | 150µV max - ensures sub-mV DC accuracy in precision measurement paths |
| Output Swing (5V, no load) | Within 40mV of VCC/VEE - maximizes dynamic range in low-voltage systems |
| Quiescent Current | 110µA typical at 5V - suitable for battery-powered handheld instrumentation |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
Pinout & Package
LT1991HDD#PBF uses a 10-lead, 3mm × 3mm plastic DFN package (exposed pad connected to VEE). Pin 1 is P1 (noninverting gain-of-1 input); Pin 10 is M1 (inverting gain-of-1 input); Pin 5 is REF (reference input); Pin 6 is OUT (rail-to-rail output); Pin 4 is VEE (negative supply); Pin 7 is VCC (positive supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1 (Pin 1) | Noninverting gain-of-1 input | Connects internally to 450kΩ resistor; sets baseline differential gain path |
| P3 (Pin 2) | Noninverting gain-of-3 input | Connects to 150kΩ resistor; enables higher-gain differential sensing |
| P9 (Pin 3) | Noninverting gain-of-9 input | Connects to 50kΩ resistor; supports high-sensitivity small-signal amplification |
| VEE (Pin 4) | Negative power supply | Accepts ground or negative rail; exposed pad must be soldered to PCB for thermal performance |
| REF (Pin 5) | Reference input | Sets output zero point; connects to 450kΩ resistor; determines common-mode output level |
| OUT (Pin 6) | Amplifier output | Rail-to-rail capable; swings to within 40mV of VCC/VEE with no load |
| VCC (Pin 7) | Positive power supply | Supports up to 36V; enables direct interface with unregulated industrial supplies |
| M9 (Pin 8) | Inverting gain-of-9 input | Complements P9; forms high-gain differential pair with matched 50kΩ resistors |
| M3 (Pin 9) | Inverting gain-of-3 input | Complements P3; provides mid-range differential gain with 150kΩ matching |
| M1 (Pin 10) | Inverting gain-of-1 input | Complements P1; primary differential input path with 450kΩ precision matching |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configurable gain | Supports difference (G=1–13), inverting (G=–0.08 to –13), and noninverting (G=0.07–14) modes without external resistors |
| Matched resistor network | 0.04% matching on 450kΩ resistors over temperature ensures stable CMRR >75dB |
| Rail-to-rail output | Delivers full-scale signal swing in 3.3V and 5V systems, preserving ADC resolution |
| Ultra-low power | 100µA supply current at 5V enables multi-channel sensor arrays with minimal thermal impact |
| High-voltage input tolerance | P1/M1 pins withstand ±60V common-mode voltage-ideal for isolated current sensing |
Applications
| Strain Gauge Amplification | Medical Instrumentation Front-End |
|---|---|
Use Scenario: Amplifying microvolt-level Wheatstone bridge outputs from load cells and pressure sensors in industrial weighing systems. IC Role / Device Role / Timing Role: Precision difference amplifier configured at G=1000 (via external scaling) to resolve sub-10µV signals with <0.1% linearity error. Use Value: Eliminates need for discrete resistor networks and trimming, reducing board area by >40% and improving long-term drift stability. | Use Scenario: Conditioning biopotential signals (ECG, EEG) in portable diagnostic devices requiring low noise and DC accuracy. IC Role / Device Role / Timing Role: High-CMRR difference amplifier (G=10) rejecting 50/60Hz mains interference while preserving sub-µV neural signal fidelity. Use Value: Achieves >100dB effective CMRR through matched internal resistors, enabling clean acquisition without guard traces or shielding. |
| Differential-to-Single-Ended Conversion | Handheld Test Equipment Input Stage |
Use Scenario: Converting differential sensor outputs (e.g., RTD, thermocouple) to single-ended signals compatible with SAR ADCs in data loggers. IC Role / Device Role / Timing Role: Configured as G=1 difference amplifier with REF tied to mid-supply to center output in ADC input range. Use Value: Maintains 16-bit ENOB by limiting gain error to ±0.08% and input-referred noise to 180nV/√Hz at 1kHz. | Use Scenario: Input amplification stage in battery-powered multimeters and oscilloscope probes requiring wide dynamic range and low power. IC Role / Device Role / Timing Role: Programmable-gain amplifier (G=1, 3, 9) supporting auto-ranging across mV/V measurement scales. Use Value: Enables 100-hour battery life via 100µA quiescent current while delivering 110kHz bandwidth at G=1 for fast transient capture. |
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, 125µV max VOS, 120dB CMRR, 1.3mA IQ, SO-8 package | Higher power, fixed gain, superior CMRR but lacks programmability and micropower operation | Choose for ultra-high CMRR in low-noise lab equipment where power is not constrained |
| AD8276ARZ | G=0.2–10 programmable, 100µV max VOS, 80dB CMRR, 220µA IQ, SO-8 package | Wider gain range than LT1991HDD#PBF but lower CMRR and no high-voltage input capability | Choose when flexible gain tuning is required and ±60V input tolerance is unnecessary |
Compared with INA128UA and AD8276ARZ, the LT1991HDD#PBF uniquely combines micropower operation (100µA), extended temperature rating (–40°C to +125°C), ±60V input tolerance on P1/M1, and pin-selectable gains - making it optimal for space-constrained, battery-powered, or harsh-environment instrumentation.
Availability
LT1991HDD#PBF is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor interfaces, and automotive subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1991HDD#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, serving industrial, automotive, communications, and healthcare markets.
The LT1991 product line was developed by Linear Technology (acquired by ADI in 2017) to deliver integrated, precision amplifier solutions that eliminate external resistor networks while maintaining metrology-grade accuracy and temperature stability.
FAQ
What is the maximum operating temperature specification for LT1991HDD#PBF?
The LT1991HDD#PBF is fully specified and guaranteed over an operating temperature range of –40°C to +125°C, making it suitable for under-hood automotive applications, industrial motor drives, and high-temperature environmental monitoring systems where standard commercial-grade amplifiers would fail.
Does LT1991HDD#PBF support rail-to-rail input operation?
No, the LT1991HDD#PBF does not feature rail-to-rail input operation-the internal op amp inputs operate within 1.2V of VCC and 1V of VEE. However, due to internal resistor attenuation, many configurations (e.g., difference amplifier with REF at mid-supply) effectively achieve rail-to-rail common-mode input range up to ±15.2V at ±15V supply.
Can LT1991HDD#PBF be used with single-supply operation?
Yes, the LT1991HDD#PBF supports true single-supply operation from 2.7V to 36V. When powered from 5V/0V, it delivers rail-to-rail output swing within 40mV of both rails and maintains full functionality in difference, inverting, and noninverting configurations with appropriate REF biasing.
What is the gain error specification for LT1991HDD#PBF at G=1?
The LT1991HDD#PBF has a maximum gain error of ±0.08% at G=1 under ±15V supply conditions with VOUT = ±10V into a 10kΩ load. This value is guaranteed across the full –40°C to +125°C temperature range and reflects the precision of its internal 450kΩ matched resistor network.
How is the reference pin (REF) used in LT1991HDD#PBF difference amplifier configurations?
In LT1991HDD#PBF difference amplifier configurations, the REF pin sets the output's zero-differential-voltage level. When tied to mid-supply (e.g., 2.5V on 5V/0V), it centers the output in the ADC input range. Internally, REF connects to a 450kΩ resistor and directly influences the common-mode output voltage per the equation VOUT = VREF + ∆VIN.
LT1991HDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- 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-DFN (3x3)
LT1991HDD#PBF FAQ
1.How can I place an order for LT1991HDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1991HDD#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 LT1991HDD#PBF reliable?
The price and inventory of LT1991HDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1991HDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1991HDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1991HDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1991HDD#PBF?
LT1991HDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1991HDD#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 LT1991HDD#PBF?
For technical support, including LT1991HDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1991HDD#PBF requirements.
6.How does Aetrix verify that LT1991HDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1991HDD#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 LT1991HDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1991HDD#PBF?
All LT1991HDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1991HDD#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 LT1991HDD#PBF part is unused and in its original packaging.
Return procedure for LT1991HDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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