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Analog Devices Inc. LT1997HDF-3#PBF
- Part No.:
- LT1997HDF-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-WFDFN Exposed Pad, 12 Leads
- Datasheet:
-
LT1997HDF-3#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
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Product details
Overview
LT1997HDF-3#PBF from Analog Devices is a precision, wide-voltage-range gain-selectable difference amplifier IC with integrated matched resistor network. It delivers ±0.006% (60 ppm) gain accuracy at G = 1, 91 dB minimum DC CMRR, and operates from 3.3 V to 50 V supplies across –40°C to +125°C. Used in high-side current sensing and industrial data-acquisition front-ends where rail-to-rail output swing and ±160 V common-mode input range are critical.
For engineers reviewing the LT1997HDF-3#PBF datasheet, LT1997HDF-3#PBF pinout, LT1997HDF-3#PBF application, or LT1997HDF-3#PBF equivalent, key selection criteria include guaranteed high-temperature performance (–40°C to 125°C), DFN14 package thermal resistance (θJA = 45°C/W), gain error drift ≤1 ppm/°C, and verified 91 dB CMRR at G = 1 over full temperature range.
Technical Context
The LT1997HDF-3#PBF integrates a precision op amp with laser-trimmed, thermally matched thin-film resistors enabling three fixed-gain configurations (G = 1, 3, 9) without external components. Its internal topology supports difference, inverting, and noninverting modes via pin-strapping of +INA/–INA, +INB/–INB, and +INC/–INC inputs.
It features Over-The-Top® operation for extended common-mode range beyond supply rails, with VCMOP support up to V+ – 1.75 V in normal mode and up to V– + 76 V in OTT mode. Shutdown control (SHDN) reduces supply current to 20 µA while maintaining fast 16 µs turn-on time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy (G = 1) | ±0.006% max - enables sub-100 ppm system-level measurement error without calibration |
| DC CMRR (G = 1) | ≥91 dB - rejects >99.99% of common-mode voltage in high-noise industrial environments |
| Supply Range | 3.3 V to 50 V - supports single-supply (3.3 V, 5 V, 24 V) and dual-supply (±15 V, ±25 V) systems |
| Input Common-Mode Range | ±160 V on +INA/–INA - allows direct connection to high-side shunt resistors in motor drives and power supplies |
| Output Swing | Within 100 mV of rails - maximizes dynamic range for low-voltage ADC interfacing |
| Temp Range | –40°C to +125°C - qualified for under-hood automotive, industrial, and energy metering applications |
| Gain Drift | ≤1 ppm/°C - ensures stable gain over temperature without software compensation |
Pinout & Package
LT1997HDF-3#PBF uses a 14-lead (4 mm × 4 mm) plastic DFN package with exposed thermal pad (Pin 15 = V–). The package provides low thermal resistance (θJA = 45°C/W) and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +INA (Pin 1) | Noninverting Gain-1 Input | Connects internally to 22.5 kΩ resistor; configures difference amplifier with G = 1 when paired with –INA |
| +INB (Pin 3) | Noninverting Gain-3 Input | Connects internally to 7.5 kΩ resistor; selects G = 3 configuration with –INB |
| +INC (Pin 5) | Noninverting Gain-9 Input | Connects internally to 2.5 kΩ resistor; enables high-gain sensing with minimal offset contribution |
| –INA (Pin 14) | Inverting Gain-1 Input | Paired with +INA for unity-gain difference amplification; matched resistor ensures CMRR ≥91 dB |
| –INB (Pin 12) | Inverting Gain-3 Input | Used with +INB for G = 3; maintains <1 ppm/°C matching over temperature |
| –INC (Pin 10) | Inverting Gain-9 Input | Enables high-sensitivity current sensing; 2.5 kΩ path minimizes noise contribution |
| REF (Pin 7) | Reference Input | Sets output zero point; accepts external reference or connects to mid-supply for bipolar operation |
| SHDN (Pin 6) | Shutdown Control | Active-high logic: tie to V+ for operation; pull >2.5 V below V+ to enter 20 µA shutdown state |
| V+ (Pin 11) | Positive Supply | Accepts up to 60 V differential from V–; supports wide-input-voltage industrial supplies |
| V– (Pin 15, Exposed Pad) | Negative Supply / Thermal Path | Must be soldered to PCB ground plane for thermal management and electrical reference |
| OUT (Pin 8) | Analog Output | Rail-to-rail capable; drives 10 kΩ load with <100 mV headroom at ±15 V supplies |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configurable gain (1, 3, 9) | Eliminates external gain-setting resistors and layout sensitivity, reducing BOM count and board area |
| ±160 V input common-mode range | Enables direct high-side current sensing in 48 V, 100 V, and 400 V bus monitoring without level-shifting circuitry |
| 91 dB min DC CMRR (G = 1) | Ensures accurate differential measurements in noisy factory-floor or motor-control environments |
| 0.006% max gain error | Meets Class 0.1 accuracy requirements for revenue-grade energy meters and precision test equipment |
| Rail-to-rail output swing | Maximizes signal-to-noise ratio when interfacing with 12-bit to 16-bit SAR ADCs operating at 3.3 V or 5 V |
| 20 µA shutdown current | Supports low-power wake-on-event architectures in battery-backed industrial IoT nodes |
Applications
| High-Side Current Sensing | Bidirectional Wide Common-Mode Current Sensing |
|---|---|
Use Scenario: Monitoring phase current in a 48 V BLDC motor drive with shunt placed between high-side FET and bus voltage. IC Role / Device Role / Timing Role: Difference amplifier configured as G = 1, rejecting 48 V common-mode while amplifying ±100 mV shunt voltage. Use Value: ±0.006% gain error and 91 dB CMRR ensure <0.1% full-scale current measurement accuracy across –40°C to 125°C. | Use Scenario: Bidirectional current monitoring in an isolated DC-DC converter with ±100 V input common-mode range. IC Role / Device Role / Timing Role: G = 1 difference amplifier with REF tied to mid-supply, delivering bipolar output proportional to current direction and magnitude. Use Value: ±160 V input range and 1 ppm/°C gain drift enable reliable operation without recalibration in wide-temperature industrial converters. |
| Industrial Data-Acquisition Front-End | High Voltage to Low Voltage Level Translation |
Use Scenario: Signal conditioning stage in a modular PLC analog input module accepting ±10 V field signals. IC Role / Device Role / Timing Role: Noninverting amplifier (G = 3) scaling ±10 V to ±3 V for 3.3 V ADC input, with REF set to 1.65 V. Use Value: Integrated 7.5 kΩ resistor network eliminates gain error from external component mismatch and tempco. | Use Scenario: Translating ±25 V sensor outputs (e.g., strain gauge bridges) to 0–5 V range for microcontroller ADCs. IC Role / Device Role / Timing Role: Difference amplifier with G = 9 and REF = 2.5 V, converting ±2.78 V differential to 0–5 V output. Use Value: 2 ppm max gain nonlinearity preserves linearity of precision transducers without post-processing correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8479ARZ | Fixed G = 1, ±200 V CM range, 120 dB CMRR, but no shutdown and higher 1.2 mA quiescent current | Superior CMRR for ultra-low-offset applications; unsuitable for low-power or multi-gain designs | Select AD8479ARZ only when >110 dB CMRR is required and power budget allows >1 mA active current |
| INA149AIDR | Fixed G = 1, ±200 V CM range, 100 dB CMRR, 1.5 mA IQ, no gain flexibility or shutdown | Higher voltage rating than LT1997HDF-3#PBF but lacks pin-selectable gain and thermal performance at 125°C | Choose INA149AIDR for legacy designs requiring TI-compatible footprint and ±200 V rating, but verify 125°C spec compliance |
Compared with AD8479ARZ and INA149AIDR, the LT1997HDF-3#PBF uniquely combines pin-selectable gain (1/3/9), 20 µA shutdown, and guaranteed 125°C operation in a thermally optimized DFN package-making it optimal for space-constrained, multi-range, high-temp industrial sensors.
Availability
LT1997HDF-3#PBF is available at Aetrix Electronics and suitable for high-side current sensing, bidirectional current monitoring, industrial data-acquisition front-ends, and high-voltage level translation requiring stable component supply across extended temperature ranges.
Supply support for LT1997HDF-3#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 LT1997-3 product line was designed to simplify precision signal conditioning in harsh environments-delivering integrated, temperature-stable resistor networks with rail-to-rail output and wide supply range for robust industrial measurement systems.
FAQ
What is the maximum common-mode input voltage supported by the LT1997HDF-3#PBF?
The LT1997HDF-3#PBF supports ±160 V common-mode voltage on the +INA and –INA pins relative to V–, verified across its full –40°C to +125°C operating range. This enables direct high-side shunt monitoring in 48 V, 100 V, and 400 V systems without external attenuators or isolation. Pins +INB/–INB/+INC/–INC are rated for (V– – 0.3 V) to (V– + 80 V).
How does the LT1997HDF-3#PBF achieve 91 dB minimum DC CMRR at G = 1?
The LT1997HDF-3#PBF achieves ≥91 dB DC CMRR at G = 1 through laser-trimmed, monolithic thin-film resistors with <1 ppm/°C matching drift and matched layout symmetry. This matching is guaranteed over temperature and process variation, and confirmed in production testing per the DFN14 package specification sheet for the H-grade variant.
Can the LT1997HDF-3#PBF operate from a single 3.3 V supply?
Yes, the LT1997HDF-3#PBF is fully specified down to 3.3 V total supply (V+ to V–), including gain error, CMRR, and output swing. At 3.3 V, it delivers rail-to-rail output swing within 15 mV of each rail (no load) and maintains 90 dB CMRR at G = 1, making it suitable for low-voltage portable and battery-powered instrumentation.
What is the purpose of the SHDN pin on the LT1997HDF-3#PBF, and how is it controlled?
The SHDN pin on the LT1997HDF-3#PBF enables low-power mode: the device operates normally when SHDN ≥ (V+ – 1.2 V), and enters 20 µA shutdown when SHDN ≤ (V+ – 2.5 V). No external pull-up is required-the internal bias allows floating SHDN to default to active mode. Turn-on time is 16 µs, supporting burst-mode sensing in energy-harvesting systems.
Is the LT1997HDF-3#PBF pin-compatible with other variants in the LT1997-3 family?
Yes, the LT1997HDF-3#PBF shares identical pinout and footprint with LT1997IDF-3#PBF (–40°C to 85°C) and all MSOP variants (LT1997HMS-3#PBF, LT1997IMS-3#PBF). All DFN14 versions use the same 14-pin layout and exposed V– pad, enabling drop-in replacement across temperature grades without PCB redesign.
LT1997HDF-3#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:
- 1.1 MHz
- Current - Input Bias:
- 5 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- 350µA
- Current - Output / Channel:
- 28 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 50 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x4)
LT1997HDF-3#PBF FAQ
1.How can I place an order for LT1997HDF-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1997HDF-3#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 LT1997HDF-3#PBF reliable?
The price and inventory of LT1997HDF-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1997HDF-3#PBF is usually 5 days.
3.What payment methods are accepted for LT1997HDF-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1997HDF-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1997HDF-3#PBF?
LT1997HDF-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1997HDF-3#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 LT1997HDF-3#PBF?
For technical support, including LT1997HDF-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1997HDF-3#PBF requirements.
6.How does Aetrix verify that LT1997HDF-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT1997HDF-3#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 LT1997HDF-3#PBF meets industry standards.
7.What is the process for return or replacement of LT1997HDF-3#PBF?
All LT1997HDF-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1997HDF-3#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 LT1997HDF-3#PBF part is unused and in its original packaging.
Return procedure for LT1997HDF-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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