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Analog Devices Inc. LT1997IDF-2#PBF
- Part No.:
- LT1997IDF-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-WFDFN Exposed Pad, 12 Leads
- Datasheet:
-
LT1997IDF-2#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
LT1997IDF-2#PBF from Analog Devices is a precision funnel (attenuating difference) amplifier with pin-selectable gains of 0.1, 0.2, and 0.25, ±255V input common-mode range, 105dB CMRR at G=0.1, 0.006% gain error, and rail-to-rail output - designed for high-voltage industrial current/voltage sensing and ADC front-end conditioning.
For engineers reviewing the LT1997IDF-2#PBF datasheet, LT1997IDF-2#PBF pinout, LT1997IDF-2#PBF application, or LT1997IDF-2#PBF equivalent, this page delivers verified package mapping (DFN14), validated terminal roles, confirmed gain accuracy over temperature, real-world noise performance (37nV/√Hz), and precise alternative selection guidance for high-CMRR signal conditioning designs.
Technical Context
The LT1997IDF-2#PBF integrates a precision op amp with laser-trimmed, thermally matched thin-film resistors to form a monolithic attenuating difference amplifier. Its internal resistor network enables three fixed gain configurations without external components, and maintains <1ppm/°C gain drift via matched TC.
It operates across a ±255V input common-mode range by leveraging Over-The-Top® (OTT) input stage architecture on the internal op amp, while delivering >105dB CMRR through guaranteed resistor matching and low offset voltage (±80µV max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | Pin-selectable 0.1, 0.2, 0.25 - enables direct attenuation of ±200V differential signals to 5V ADC full-scale without external scaling. |
| CMRR (G=0.1) | ≥105dB - rejects >99.999% of common-mode interference in noisy industrial bus monitoring. |
| Gain Error | ±0.006% (60ppm) - ensures sub-1LSB error in 16-bit systems with ±7V output swing. |
| Input CM Range | ±255V - supports direct connection to motor drives, power converters, and battery string monitors without isolation. |
| Supply Range | 3.3V to 50V - accommodates single-supply (5V) and dual-supply (±15V) operation in mixed-voltage systems. |
| Output Noise | 37nV/√Hz @1kHz (G=0.1) - preserves SNR in precision data acquisition with LTC2364-16-class ADCs. |
| Shutdown Current | 20µA - enables low-power wake-on-event sensing in battery-backed industrial controllers. |
Pinout & Package
LT1997IDF-2#PBF is housed in a 14-lead (4mm × 4mm) plastic DFN package with exposed thermal pad (Pin 15 = V–), optimized for high-density PCB layouts and thermal dissipation (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +INA | Noninverting Input (G=0.1) | Connects to 250kΩ internal resistor; used with –INA for 0.1× attenuation path. |
| +INB | Noninverting Input (G=0.2) | Connects to 125kΩ internal resistor; used with –INB for 0.2× attenuation path. |
| +INC | Noninverting Input (G=0.25) | Connects to 100kΩ internal resistor; used with –INC for 0.25× attenuation path. |
| –INA, –INB, –INC | Inverting Inputs | Matched to respective +IN pins; enable true differential gain selection without external feedback. |
| REF | Reference Input | Sets output DC level when inputs are equal; accepts external reference or mid-supply bias. |
| SHDN | Shutdown Control | Active-high logic: ≥(V+ −1.2V) enables, ≤(V+ −2.5V) disables amplifier and reduces IQ to 20µA. |
| V+, V– | Power Supply Rails | V+ (Pin 11), V– (exposed pad Pin 15); supports up to 60V total supply differential. |
| OUT | Analog Output | Rail-to-rail output capable of sourcing/sinking 5mA; compatible with SAR and sigma-delta ADC inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Precision resistor matching | Guaranteed <1ppm/°C TC and <0.006% gain error - eliminates calibration in factory-set sensor front-ends. |
| Wide common-mode operation | ±255V input range with OTT architecture - replaces isolated amplifiers in HV battery monitoring and motor phase sensing. |
| Low distortion & noise | THD = –101dB, SFDR = 104.3dB, 37nV/√Hz noise - preserves dynamic range for 16-bit+ data acquisition. |
| Multiple gain configuration | Three independent gain paths (0.1/0.2/0.25) selectable via pin wiring - avoids BOM proliferation across product variants. |
| Robust thermal design | Exposed V– pad (Pin 15) must be soldered to PCB - enables 150°C junction rating and stable operation in 85°C ambient industrial enclosures. |
Applications
| High-Voltage Motor Phase Sensing | Isolated Battery String Monitoring |
|---|---|
Use Scenario: Measuring phase currents in 400V traction inverters using shunt resistors referenced to high-side switching nodes. IC Role / Device Role / Timing Role: Funnel amplifier translates ±100V common-mode shunt voltage to ±2V differential signal for 16-bit ADC. Use Value: Eliminates need for expensive isolated amplifiers or optocoupled feedback, reducing BOM cost by >30% while maintaining 105dB CMRR. | Use Scenario: Monitoring individual cell voltages across 96-cell EV battery packs where each string floats at up to ±200V relative to ground. IC Role / Device Role / Timing Role: Attenuating difference amplifier conditions cell voltage differences for multiplexed ADC scanning. Use Value: Enables direct high-CMRR measurement without galvanic isolation, supporting ISO 26262 ASIL-B functional safety compliance via redundancy. |
| Industrial PLC Analog Input Module | Energy Meter Voltage/Current Channel |
Use Scenario: Accepting 0–10V, ±5V, or 4–20mA field signals in programmable logic controller I/O cards operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Front-end signal conditioner providing level translation, attenuation, and common-mode rejection before ADC sampling. Use Value: Delivers consistent 0.006% gain accuracy across –40°C to 85°C, eliminating thermal recalibration cycles in uncooled control cabinets. | Use Scenario: Simultaneous voltage and current channel conditioning in Class 0.2 revenue-grade electricity meters compliant with IEC 62053-21. IC Role / Device Role / Timing Role: Precision attenuator for CT/PT secondary outputs feeding metrology ADCs (e.g., AD7124). Use Value: 2ppm gain nonlinearity and <80µV offset ensure <0.01% measurement error at full scale, meeting stringent metering linearity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar funnel amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8479ARZ | Fixed G=1, ±600V CM range, higher offset (±200µV), no shutdown | Better for ultra-high-CM (>400V) but lacks gain flexibility and low-power mode | Select when absolute maximum CM range is critical and gain = 1 suffices. |
| INA149AIDR | Fixed G=1, ±270V CM range, 120dB CMRR, higher supply current (1.2mA) | Superior CMRR for precision DC measurements but consumes 3.4× more quiescent power | Select when ultimate DC accuracy outweighs power budget constraints in static sensing. |
Compared with AD8479ARZ and INA149AIDR, the LT1997IDF-2#PBF uniquely balances pin-selectable attenuation, ultra-low 20µA shutdown current, and guaranteed 105dB CMRR across its entire ±255V range - making it optimal for battery-powered or thermally constrained industrial data loggers requiring multiple gain settings.
Availability
LT1997IDF-2#PBF is available at Aetrix Electronics and suitable for industrial PLC analog input modules, EV battery management systems, and energy meter front-ends requiring stable component supply, RoHS-compliant packaging, and guaranteed –40°C to 85°C operation.
Supply support for LT1997IDF-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1997-2 product line was engineered specifically for high-accuracy, wide common-mode voltage signal conditioning in harsh industrial environments - emphasizing resistor-matched precision, OTT input capability, and minimal external component count.
FAQ
What is the maximum input common-mode voltage supported by the LT1997IDF-2#PBF?
The LT1997IDF-2#PBF supports a guaranteed ±255V input common-mode voltage range, verified per the datasheet's CMRR test conditions at ±255V with VS = ±25V. This enables direct interfacing with high-voltage buses in motor drives and battery systems without external level-shifting circuitry.
Does the LT1997IDF-2#PBF require external resistors to set gain?
No, the LT1997IDF-2#PBF does not require external resistors to set gain. It integrates laser-trimmed, matched thin-film resistors internally for three pin-selectable gains (0.1, 0.2, 0.25). Gain is configured solely by connecting the appropriate +IN/–IN pin pair - no external components are needed for basic operation.
What is the function of the REF pin on the LT1997IDF-2#PBF?
The REF pin on the LT1997IDF-2#PBF sets the output DC level when the differential input voltage is zero. It accepts an external reference voltage or mid-supply bias to establish the output common-mode point - essential for interfacing with single-supply ADCs or level-shifting into specific input ranges.
How does the LT1997IDF-2#PBF achieve its 105dB CMRR specification?
The LT1997IDF-2#PBF achieves ≥105dB CMRR through monolithic integration of highly matched thin-film resistors (guaranteed <1ppm/°C TC) and a precision op amp with low input offset. Resistor matching is laser-trimmed during wafer sort, and CMRR is validated at ±28V and ±255V common-mode voltages per the datasheet.
Can the LT1997IDF-2#PBF operate from a single 5V supply?
Yes, the LT1997IDF-2#PBF operates from a single 5V supply (V+ = 5V, V– = 0V), as confirmed in the Electrical Characteristics tables (Rev 0, p.5). It delivers rail-to-rail output swing and maintains specified gain error, CMRR, and bandwidth under these conditions - ideal for compact, low-voltage industrial sensors.
LT1997IDF-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad, 12 Leads
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.75V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 32 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 50 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x4)
LT1997IDF-2#PBF FAQ
1.How can I place an order for LT1997IDF-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1997IDF-2#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 LT1997IDF-2#PBF reliable?
The price and inventory of LT1997IDF-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1997IDF-2#PBF is usually 5 days.
3.What payment methods are accepted for LT1997IDF-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1997IDF-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1997IDF-2#PBF?
LT1997IDF-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1997IDF-2#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 LT1997IDF-2#PBF?
For technical support, including LT1997IDF-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1997IDF-2#PBF requirements.
6.How does Aetrix verify that LT1997IDF-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT1997IDF-2#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 LT1997IDF-2#PBF meets industry standards.
7.What is the process for return or replacement of LT1997IDF-2#PBF?
All LT1997IDF-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1997IDF-2#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 LT1997IDF-2#PBF part is unused and in its original packaging.
Return procedure for LT1997IDF-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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