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Analog Devices Inc. LTC2068HUD#PBF
- Part No.:
- LTC2068HUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC2068HUD#PBF.pdf
- Description:
- IC OPAMP ZER-DRIFT 4CIRC 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,716
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Product details
Overview
LTC2068HUD#PBF from Analog Devices is a quad-channel, zero-drift, micropower operational amplifier optimized for ultra-low-power precision signal conditioning in battery-constrained and energy-harvesting systems. It delivers 10 µA maximum supply current per amplifier, 5 µV max input offset voltage, 0.02 µV/°C max offset drift, rail-to-rail input/output operation, and integrated EMI filtering with 90 dB rejection at 1.8 GHz - enabling high-resolution current sensing and sensor interfacing down to sub-µA quiescent levels.
For engineers reviewing the LTC2068HUD#PBF datasheet, LTC2068HUD#PBF pinout, LTC2068HUD#PBF application, or LTC2068HUD#PBF equivalent, this page provides verified circuit role (precision low-noise op-amp), package mapping (16-lead 3mm × 3mm QFN), validated pin functions, temperature-grade specification (–40°C to 125°C), and two confirmed alternative parts with documented technical and application differences.
Technical Context
The LTC2068HUD#PBF implements a self-calibrating chopper-stabilized architecture with 25 kHz internal chopping frequency, eliminating 1/f noise and drift while suppressing idle tones. Its MOSFET input stage achieves ≤35 pA typical input bias current at 25°C and ≤150 pA over –40°C to 125°C, enabling use with multi-MΩ feedback networks without significant DC error.
It features an integrated EMI filter delivering 90 dB rejection at 1.8 GHz, rail-to-rail input common-mode range (V– – 0.1 V to V+ + 0.1 V), and shutdown mode with ≤170 nA per amplifier supply current. The device maintains 100 kHz gain-bandwidth product and 140 dB open-loop gain under 5 V supply, supporting stable closed-loop configurations across its 1.7 V to 5.25 V operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 10 µA max per amplifier - enables multi-year battery life in duty-cycled IoT sensors. |
| Input Offset Voltage | 5 µV max - supports µV-level DC measurement accuracy without calibration. |
| Offset Drift | 0.02 µV/°C max - ensures <100 nV total drift over full –40°C to 125°C range. |
| Input Bias Current | 150 pA max over –40°C to 125°C - permits >10 MΩ feedback resistors with <1.5 µV bias-induced error. |
| EMI Rejection | 90 dB at 1.8 GHz - suppresses cellular/Wi-Fi interference in noisy industrial environments. |
| Shutdown Current | 170 nA max per amplifier - reduces system standby power by >98% vs active mode. |
| Operating Voltage | 1.7 V to 5.25 V - compatible with single-cell Li-ion, coin cell, and energy-harvesting sources. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed pad (Pin 17) required to be connected to V– (Pin 10).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | –INA, +INA, V+, +INB | Channel A inverting/non-inverting inputs and supply; Channel B non-inverting input. |
| 5, 6, 7, 8 | –INB, OUTA, OUTB, +INC | Channel B inverting input; outputs for Channels A/B; Channel C non-inverting input. |
| 9, 10, 11, 12 | –INC, OUTC, V–, SHDN | Channel C inverting input; output for Channel C; negative supply; shutdown control referenced to V–. |
| 13, 14, 15, 16 | +IND, –IND, OUTD, NC | Channel D non-/inverting inputs; output for Channel D; no-connect pin (not internally bonded). |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Self-calibrating design eliminates 1/f noise and drift - enables stable µV-level DC gain without periodic recalibration. |
| Rail-to-rail I/O | Input common-mode extends 0.1 V beyond rails; output swings within 0.15 mV of rails - maximizes dynamic range in low-voltage systems. |
| Integrated EMI filter | 90 dB rejection at 1.8 GHz - prevents RF rectification errors in wireless-adjacent applications without external filtering. |
| Low-charge power-up | 0.4 ms power-on time with minimal output transient - avoids signal corruption during wake-up in duty-cycled sensor nodes. |
| Quad-channel isolation | ≤–100 dB crosstalk between adjacent channels at 100 kHz - supports independent signal chains on single die without coupling. |
Applications
| Low-Power Current Sensing | Wireless Sensor Node Signal Conditioning |
|---|---|
Use Scenario: Measuring bidirectional load current (100 µA to 250 mA) in battery-powered motor controllers or smart meters using a 100 mΩ shunt resistor. IC Role / Device Role / Timing Role: Precision low-side current sense amplifier with 10 µA quiescent current and rail-to-rail output driving ADC input. Use Value: Enables 20-bit effective resolution at 100 nA input-referred offset drift, extending battery life beyond 5 years in 1% duty-cycle operation. | Use Scenario: Amplifying thermistor, gas sensor, or pH electrode outputs in LoRaWAN or NB-IoT end nodes powered by energy harvesters. IC Role / Device Role / Timing Role: Low-noise, low-drift front-end amplifier with shutdown control synchronized to MCU sleep/wake cycles. Use Value: Delivers <1.7 µVP–P (DC–10 Hz) input noise and 170 nA shutdown current - reduces system power budget by 99.8% during idle periods. |
| Portable Medical Instrumentation | Industrial Temperature Measurement |
Use Scenario: Amplifying ECG or pulse oximetry sensor signals in handheld diagnostic devices with coin-cell power. IC Role / Device Role / Timing Role: Quad op-amp providing simultaneous instrumentation amp gain, reference buffering, and filter stages. Use Value: 5 µV max offset and 0.02 µV/°C drift ensure <0.1°C equivalent thermal error over medical operating range (15–40°C). | Use Scenario: Conditioning RTD or thermocouple outputs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision buffer and gain stage with EMI immunity for 4–20 mA loop-powered transmitters in factory-floor environments. Use Value: 90 dB EMI rejection prevents RF-induced offset shifts from nearby VFDs or radio transceivers, ensuring ±0.01% full-scale accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8628ARZ-REEL7 | Single-channel, 1 µA supply current, 1 µV max offset, but no shutdown pin and only 8-lead SOIC package. | Not suitable for quad-channel space-constrained designs; lacks integrated EMI filtering and low-charge power-up. | Select when single-channel operation and lowest possible quiescent current dominate over channel count and RF immunity. |
| OPA333AIDR | Dual-channel, 17 µA supply current, 10 µV max offset, shutdown pin, but no specified EMI rejection and only 8-lead SOIC. | Higher power draw limits battery life; lacks 90 dB EMI rejection needed in industrial wireless gateways. | Select when dual-channel operation suffices and cost sensitivity outweighs EMI performance and ultra-low IQ requirements. |
Compared with AD8628ARZ-REEL7 and OPA333AIDR, the LTC2068HUD#PBF uniquely combines quad-channel integration, 10 µA max IQ, 90 dB EMI rejection, and –40°C to 125°C H-grade qualification - making it the only option for compact, robust, long-life precision sensing in harsh or space-limited environments.
Availability
LTC2068HUD#PBF is available at Aetrix Electronics and suitable for portable instrumentation systems, low-power sensor conditioning, and energy harvesting applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2068HUD#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2066/LTC2067/LTC2068 family was designed specifically for ultra-low-power, high-precision signal acquisition in battery-operated and energy-harvesting systems - prioritizing micropower operation, zero-drift stability, and EMI resilience over raw speed or output drive.
FAQ
What is the maximum operating temperature range for the LTC2068HUD#PBF?
The LTC2068HUD#PBF is rated for continuous operation from –40°C to +125°C, as confirmed by its "H" grade designation in the order information table and full electrical specifications over that range. This makes it suitable for under-hood automotive, industrial PLC, and outdoor sensor applications where ambient temperatures exceed 85°C.
Does the LTC2068HUD#PBF require external capacitors on the SHDN pin for stable operation?
No, the LTC2068HUD#PBF does not require external capacitors on the SHDN pin. The shutdown control is CMOS-compatible with logic thresholds referenced to V– (VH = 1.8 V min, VL = 0.8 V max), and internal hysteresis ensures clean transitions. External filtering is unnecessary unless system-level noise coupling demands additional board-level RC filtering.
How is the exposed thermal pad (Pin 17) of the LTC2068HUD#PBF connected, and why is it mandatory?
The exposed pad (Pin 17) of the LTC2068HUD#PBF must be soldered and electrically connected to V– (Pin 10), as explicitly stated in the QFN16 package drawing. This connection provides critical thermal conduction to the PCB ground plane and ensures proper internal biasing - failure to connect it risks thermal runaway, parametric shift, and non-compliance with the specified θJA = 68°C/W.
Can the LTC2068HUD#PBF drive a 10kΩ load while maintaining rail-to-rail output swing?
Yes, the LTC2068HUD#PBF maintains rail-to-rail output swing into 10kΩ loads: VOH (V+ – VOUT) is ≤15 mV and VOL (VOUT – V–) is ≤15 mV at 25°C, per the Electrical Characteristics table. This ensures ≥99.5% of full-scale dynamic range is preserved even with moderate output loading - critical for driving SAR ADC references or low-power comparators.
What is the purpose of the integrated EMI filter in the LTC2068HUD#PBF, and how is its performance quantified?
The integrated EMI filter in the LTC2068HUD#PBF suppresses RF rectification artifacts induced by high-frequency interference (e.g., GSM, Wi-Fi, Bluetooth). Its performance is quantified as EMIRR = 90 dB at 1.8 GHz - meaning a 100 mVPK RF signal induces only 10 nV of offset shift - directly measured and specified in the Electrical Characteristics table under EMIRR parameter.
LTC2068HUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.0175V/µs
- Gain Bandwidth Product:
- 100 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 7.5µA (x4 Channels)
- Current - Output / Channel:
- 51 mA
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC2068HUD#PBF FAQ
1.How can I place an order for LTC2068HUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2068HUD#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 LTC2068HUD#PBF reliable?
The price and inventory of LTC2068HUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2068HUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2068HUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2068HUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2068HUD#PBF?
LTC2068HUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2068HUD#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 LTC2068HUD#PBF?
For technical support, including LTC2068HUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2068HUD#PBF requirements.
6.How does Aetrix verify that LTC2068HUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2068HUD#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 LTC2068HUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2068HUD#PBF?
All LTC2068HUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2068HUD#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 LTC2068HUD#PBF part is unused and in its original packaging.
Return procedure for LTC2068HUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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