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Analog Devices Inc. LTC2068HF#PBF
- Part No.:
- LTC2068HF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LTC2068HF#PBF.pdf
- Description:
- IC OPAMP ZER-DRIFT 4CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,940
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Product details
Overview
LTC2068HF#PBF from Analog Devices is a quad, zero-drift, rail-to-rail input/output operational amplifier optimized for ultra-low-power precision sensing. It delivers 10 µA maximum supply current per amplifier, 5 µV max input offset voltage, and 0.02 µV/°C max offset drift across –40°C to 125°C - enabling high-resolution current sensing and sensor signal conditioning in energy-constrained industrial and medical instrumentation.
For engineers reviewing the LTC2068HF#PBF datasheet, LTC2068HF#PBF pinout, LTC2068HF#PBF application, or LTC2068HF#PBF equivalent, this page provides verified package mapping (14-lead TSSOP), validated shutdown behavior (170 nA max), confirmed EMI rejection (90 dB at 1.8 GHz), and real-world use cases in low-side current sense and portable gas detection systems.
Technical Context
The LTC2068HF#PBF employs auto-zeroing and chopper-stabilized architecture with 25 kHz internal chopping frequency to eliminate 1/f noise and maintain sub-µV offset stability over temperature and time. Its self-calibrating circuitry operates continuously without idle tones, suppressing clock feedthrough artifacts that would otherwise corrupt DC-critical measurements.
It integrates an on-chip EMI filter delivering 90 dB rejection at 1.8 GHz, supports 1.7 V to 5.25 V single-supply operation, and features a dedicated SHDN pin referenced to V– with 1.0 V logic-high threshold - enabling precise duty-cycled power management in wireless sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 10 µA max per amplifier - enables multi-year battery life in always-on IoT sensors |
| Input Offset Voltage | 5 µV max - ensures <1 µV error in 100 mΩ shunt-based current measurement |
| Offset Drift | 0.02 µV/°C max - eliminates calibration drift in wide-temperature industrial environments |
| Input Bias Current | 150 pA max (–40°C to 125°C) - permits use of >1 MΩ feedback resistors without gain error |
| EMI Rejection | 90 dB at 1.8 GHz - suppresses cellular/Wi-Fi interference in unshielded portable devices |
| Shutdown Current | 170 nA max per amplifier - reduces system standby power by >99% vs active mode |
| Gain Bandwidth | 100 kHz - sufficient for DC–10 kHz sensor signals including thermocouples and gas sensors |
Pinout & Package
Package: 14-lead TSSOP (0.65 mm pitch, 5.0 mm × 4.4 mm body), rated for –40°C to 125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | OUTA, OUTB, OUTC, OUTD | Amplifier outputs - rail-to-rail swing supports full-scale output into 10 kΩ load |
| 2, 6, 10, 14 | –INA, –INB, –INC, –IND | Inverting inputs - matched input capacitance (3.3 pF diff) minimizes phase mismatch in multi-channel designs |
| 3, 7, 11, 12 | +INA, +INB, +INC, +IND | Noninverting inputs - low 5 pA typical bias enables high-Z sensor interfacing without guard traces |
| 4 | V+ | Positive supply - bypass capacitor required; PSRR >106 dB ensures immunity to supply ripple |
| 8 | V– | Negative supply - reference for SHDN pin and output swing; exposed pad not present in TSSOP |
| 12 | SHDN | Active-high shutdown control - logic threshold referenced to V–; sinking <150 nA when low |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Eliminates 1/f noise and thermal drift - maintains µV-level accuracy over decades of operation |
| Rail-to-rail I/O | Enables full dynamic range utilization from 1.7 V supply - critical for single-cell Li-ion and energy-harvesting systems |
| Integrated EMI filter | 90 dB rejection at 1.8 GHz - removes RF rectification errors without external LC filtering |
| Low-charge power-up | <0.4 ms wake-up time with minimal output transient - avoids signal corruption during duty-cycled sampling |
| Quad-channel isolation | Typical crosstalk <–100 dB at 100 kHz - supports independent signal chains in compact multi-sensor modules |
Applications
| Low-Side Current Sensing | Portable Gas Detection |
|---|---|
Use Scenario: Measuring 100 µA–250 mA load current via 100 mΩ shunt in battery-powered smoke detector. IC Role / Device Role / Timing Role: Precision differential amplifier with 10× gain configuration; no timing role - DC-coupled signal path. Use Value: 5 µV offset enables ±1 µA resolution at 100 µA full scale; 10 µA quiescent current extends 10-year battery life. | Use Scenario: Amplifying low-level electrochemical sensor output (nA-level) in handheld CO monitor. IC Role / Device Role / Timing Role: Transimpedance amplifier front-end; no timing role - continuous analog signal conditioning. Use Value: 150 pA max input bias prevents sensor polarization; 90 dB EMI rejection blocks ambient RF interference. |
| Medical Temperature Monitoring | Wireless Sensor Node Signal Chain |
Use Scenario: Conditioning PT1000 bridge output in wearable clinical thermometer with 0.01°C resolution. IC Role / Device Role / Timing Role: Instrumentation-grade buffer and gain stage; no timing role - stable DC amplification. Use Value: 0.02 µV/°C drift contributes <0.002°C error over 100°C range; rail-to-rail output drives ADC directly. | Use Scenario: Multi-channel analog front-end for LoRaWAN soil moisture node with thermistor, pH, and EC sensors. IC Role / Device Role / Timing Role: Quad-channel signal conditioner - one amp per sensor; no timing role. Use Value: Single 14-pin TSSOP replaces four discrete op-amps - saves 32 mm² PCB area and simplifies layout. |
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 lower IS but 10× higher IB (500 pA max), no integrated EMI filter | Not suitable for multi-sensor integration; requires external EMI mitigation in RF-rich environments | Select when only one channel is needed and board space allows discrete EMI filtering |
| LTC2057HMS8#PBF | Dual-channel, 2× higher IS (20 µA max), same 5 µV VOS but no SHDN pin or EMI filter | Lacks shutdown capability - unsuitable for duty-cycled sensor nodes requiring ultra-low standby power | Select when dual-channel count suffices and continuous operation is acceptable |
Compared with AD8628ARZ-REEL7 and LTC2057HMS8#PBF, the LTC2068HF#PBF uniquely combines quad-channel density, 170 nA shutdown, and 90 dB EMI rejection - making it the only option for compact, battery-operated, RF-immune multi-sensor systems operating across –40°C to 125°C.
Availability
LTC2068HF#PBF is available at Aetrix Electronics and suitable for low-power current sensing, portable medical instrumentation, wireless sensor networks, and industrial condition monitoring requiring stable component supply across extended temperature ranges.
Supply support for LTC2068HF#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 LTC2068HF#PBF belongs to the LTC® zero-drift op-amp family, engineered specifically for ultra-low-power, high-accuracy DC signal conditioning in energy-constrained and thermally demanding applications.
FAQ
What is the maximum operating temperature range specified for the LTC2068HF#PBF?
The LTC2068HF#PBF is fully specified over the –40°C to 125°C temperature range, as indicated by the "H" grade suffix and confirmed in the Absolute Maximum Ratings table. This extended range supports deployment in under-hood automotive subsystems, industrial motor controls, and outdoor environmental sensors where ambient temperatures exceed 85°C.
Does the LTC2068HF#PBF require external components for EMI suppression?
No, the LTC2068HF#PBF does not require external components for EMI suppression. It integrates an on-chip EMI filter providing 90 dB rejection at 1.8 GHz, as measured per standard test methods. This eliminates the need for external ferrite beads or RC filters in cellular/Wi-Fi coexistence scenarios - a key differentiator versus conventional op-amps like the AD8628.
How does the shutdown functionality of the LTC2068HF#PBF behave during power-up?
The LTC2068HF#PBF features low-charge power-up with <0.4 ms enable time and minimal output transient, as verified in Figure 29 of the datasheet. When SHDN transitions from V– to V+, the amplifier enters active mode without output overshoot or latch-up - critical for systems sampling immediately after wake-up, such as duty-cycled gas sensors.
Can the LTC2068HF#PBF drive a 10kΩ load while maintaining rail-to-rail output swing?
Yes, the LTC2068HF#PBF maintains rail-to-rail output swing into a 10 kΩ load: VOH ≤ 7 mV below V+ and VOL ≤ 15 mV above V– at 25°C (typical), per Electrical Characteristics Table. This performance holds across –40°C to 125°C, enabling direct interface with 12-bit SAR ADCs without level-shifting circuitry.
What is the guaranteed input bias current specification for the LTC2068HF#PBF over its full temperature range?
The guaranteed input bias current for the LTC2068HF#PBF is ±150 pA maximum over the full –40°C to 125°C operating range, as stated in the Electrical Characteristics table under "IB - Input Bias Current". This value applies to all four amplifiers and is production-tested - enabling reliable use with >1 MΩ feedback networks in high-impedance sensor interfaces.
LTC2068HF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- 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:
- 14-TSSOP
LTC2068HF#PBF FAQ
1.How can I place an order for LTC2068HF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2068HF#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 LTC2068HF#PBF reliable?
The price and inventory of LTC2068HF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2068HF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2068HF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2068HF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2068HF#PBF?
LTC2068HF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2068HF#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 LTC2068HF#PBF?
For technical support, including LTC2068HF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2068HF#PBF requirements.
6.How does Aetrix verify that LTC2068HF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2068HF#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 LTC2068HF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2068HF#PBF?
All LTC2068HF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2068HF#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 LTC2068HF#PBF part is unused and in its original packaging.
Return procedure for LTC2068HF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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