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Analog Devices Inc. LTC2068IF#PBF
- Part No.:
- LTC2068IF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LTC2068IF#PBF.pdf
- Description:
- IC OPAMP ZER-DRIFT 4CIRC 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:165
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Product details
Overview
LTC2068IF#PBF from Analog Devices is a quad-channel, zero-drift, rail-to-rail input/output operational amplifier optimized for ultra-low-power precision sensing. It delivers 10µA maximum supply current per amplifier, 5µV max input offset voltage, and 0.02µV/°C max offset drift across –40°C to 85°C - enabling high-resolution current sensing and sensor signal conditioning in energy-constrained wireless sensor nodes.
For engineers reviewing the LTC2068IF#PBF datasheet, LTC2068IF#PBF pinout, LTC2068IF#PBF application, or LTC2068IF#PBF equivalent, key selection criteria include its 100kHz gain-bandwidth product, 35pA max input bias current at 85°C, integrated EMI filter (90dB rejection at 1.8GHz), shutdown mode with 170nA max current, and compatibility with 1.7V–5.25V single-supply operation.
Technical Context
The LTC2068IF#PBF employs auto-zeroing and chopper-stabilized architecture to eliminate 1/f noise and achieve sub-microvolt offset stability over temperature and time. Its internal 25kHz chopping frequency is suppressed to minimize clock feedthrough, and the integrated EMI filter ensures robust operation in noisy RF environments such as industrial IoT gateways and portable medical monitors.
Each of the four amplifiers features independent shutdown control via the SHDN pin (logic-high threshold = 1.8V referenced to V–), rail-to-rail input common-mode range extending 100mV beyond rails, and output swing within 0.15mV of V+ and 0.1mV of V– at light loads - supporting accurate low-voltage signal acquisition in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 10µA max per amplifier - enables multi-year operation on coin-cell batteries in duty-cycled sensor nodes. |
| Input Offset Voltage | ±5µV max - supports µV-level DC measurements without calibration in precision current sense and thermocouple interfaces. |
| Offset Drift | ±0.02µV/°C max - ensures stable baseline over wide ambient temperature swings in outdoor instrumentation. |
| Input Bias Current | ±50pA max (–40°C to 85°C) - permits use of MΩ-range feedback resistors without significant error in high-impedance pH or gas sensor circuits. |
| Gain Bandwidth | 100kHz - sufficient for DC–10kHz sensor signals including strain gauges, RTDs, and electrochemical sensors. |
| EMI Rejection | 90dB at 1.8GHz - mitigates interference from cellular/Wi-Fi transceivers in compact wearable and edge-node PCBs. |
| Shutdown Current | 170nA max per amplifier - reduces system standby power by >98% versus active mode in wake-on-event architectures. |
Pinout & Package
The LTC2068IF#PBF is housed in a 14-lead TSSOP package (JEDEC MO-153, 5.0mm × 4.4mm × 1.2mm) with exposed pad not connected internally; thermal performance specified at θJA = 100°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives low-impedance loads up to 10mA sourcing/sinking; rail-to-rail swing minimizes headroom loss. |
| 2 | –INA | Inverting input of Amp A - high-impedance node; sensitive to layout-induced thermocouple voltages and leakage. |
| 3 | +INA | Noninverting input of Amp A - matched to Pin 2 for common-mode rejection; requires symmetrical PCB routing. |
| 4 | V+ | Positive supply rail - bypass with ≥100nF ceramic capacitor close to pin to suppress supply noise and ensure stability. |
| 5 | +INB | Noninverting input of Amp B - electrically isolated from other inputs; supports independent differential channel configuration. |
| 6 | –INB | Inverting input of Amp B - shares no internal coupling with Amp A inputs; crosstalk < –100dB at 1MHz. |
| 7 | OUTB | Amplifier B output - independently buffered; no shared output stage with other channels. |
| 8 | OUTD | Amplifier D output - pin 8 is dedicated to Amp D, enabling simultaneous 4-channel analog front-end design. |
| 9 | –IND | Inverting input of Amp D - positioned adjacent to V– (Pin 10) to minimize thermal gradients in precision layouts. |
| 10 | V– | Negative supply rail - reference for all inputs/outputs and SHDN threshold; must be solidly decoupled. |
| 11 | +INC | Noninverting input of Amp C - routed away from digital traces to preserve 140dB open-loop gain integrity. |
| 12 | –INC | Inverting input of Amp C - paired with Pin 11; differential pair layout critical for CMRR >108dB. |
| 13 | OUTC | Amplifier C output - supports independent gain-setting; compatible with 10kΩ load for full rail-to-rail swing. |
| 14 | SHDN | Global shutdown control - logic-high (>1.8V vs V–) enables all four amplifiers; floating prohibited. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Eliminates 1/f noise and drift errors - enables stable µV-level DC measurements over years without recalibration. |
| Rail-to-rail I/O | Full dynamic range utilization from 1.7V supply - preserves signal fidelity in low-voltage microcontroller-based systems. |
| Integrated EMI filter | 90dB rejection at 1.8GHz - prevents RF rectification artifacts in cellular/Wi-Fi coexistence designs without external LC filters. |
| Low-charge power-up | 0.4ms enable time with minimal output transient - avoids disruptive glitches during wake-from-sleep transitions. |
| Quad independent amplifiers | No shared internal resources - allows concurrent signal conditioning of four independent sensors with guaranteed channel isolation. |
Applications
| Current Sensing in Portable Medical Devices | Precision Gas Sensor Signal Conditioning |
|---|---|
Use Scenario: Monitoring microamp-level leakage currents in implantable cardioverter-defibrillator (ICD) battery management circuits. IC Role / Device Role / Timing Role: LTC2068IF#PBF serves as the front-end current-to-voltage converter in a low-side shunt measurement path. Use Value: 35pA max input bias current prevents error amplification across 1MΩ sense resistors, enabling ±1µA current resolution at 1.8V supply. | Use Scenario: Amplifying weak nA-level output currents from electrochemical CO sensors in handheld air quality monitors. IC Role / Device Role / Timing Role: LTC2068IF#PBF configures as a transimpedance amplifier with 10GΩ feedback resistor. Use Value: 5µV max offset and 0.02µV/°C drift ensure <1ppm CO concentration error over 0–50°C operating range. |
| Wireless Temperature Node with RTD Bridge | Energy Harvesting System Voltage Monitoring |
Use Scenario: Exciting and measuring 3-wire Pt100 RTD bridges in battery-free LoRaWAN temperature transmitters powered by solar harvesters. IC Role / Device Role / Timing Role: LTC2068IF#PBF implements precision instrumentation amplifier topology using two op-amps per channel. Use Value: 100kHz GBW supports fast bridge settling; 10µA quiescent current extends harvester runtime by >3× versus standard op-amps. | Use Scenario: Monitoring supercapacitor voltage during charge/discharge cycles in vibration-energy-harvested structural health monitoring nodes. IC Role / Device Role / Timing Role: LTC2068IF#PBF operates as a low-power comparator with hysteresis, using one amp for threshold detection and another for reference buffering. Use Value: Shutdown current of 170nA allows continuous monitoring with <1µA average system draw - critical for sub-10µW harvesting budgets. |
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 |
|---|---|---|---|
| LTC2066IS5#TRPBF | Single-channel, 5-lead TSOT-23, same specs but no shutdown pin; 7.5µA typical supply current. | Used where space is constrained and only one amplifier is needed; lacks independent shutdown control. | Select when board area is premium and quad functionality is unnecessary - saves ~3mm² per channel. |
| AD8538ARZ-REEL7 | Single zero-drift op-amp; 65µA supply current, 1.5µV offset, no integrated EMI filter, no shutdown mode. | Suitable for cost-sensitive industrial controls where RF immunity is less critical and higher power is acceptable. | Choose for legacy designs requiring pin-compatible replacement with relaxed power/EMI requirements. |
Compared with LTC2066IS5#TRPBF and AD8538ARZ-REEL7, the LTC2068IF#PBF uniquely combines quad integration, sub-100nA shutdown, and 90dB EMI rejection - making it the only option for space- and power-constrained multi-sensor nodes requiring RF-hardened precision.
Availability
LTC2068IF#PBF is available at Aetrix Electronics and suitable for portable instrumentation systems, wireless mesh networks, and low-power sensor conditioning requiring stable component supply across extended temperature ranges.
Supply support for LTC2068IF#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 energy-constrained sensing applications - emphasizing micropower operation without sacrificing DC accuracy or noise performance.
FAQ
What is the maximum operating temperature range for the LTC2068IF#PBF?
The LTC2068IF#PBF is specified for operation from –40°C to +85°C (I-grade). This is confirmed in the ORDER INFORMATION table, where "LTC2068IF#PBF" is explicitly listed with "–40°C to 85°C" under Temperature Range. The H-grade variant (LTC2068HF#PBF) extends to 125°C, but the IF suffix denotes the industrial grade.
Does the LTC2068IF#PBF require external capacitors on the SHDN pin for stable operation?
No, the LTC2068IF#PBF does not require external capacitors on the SHDN pin. The datasheet specifies SHDN as a CMOS logic input with defined thresholds (1.8V high, 0.8V low, referenced to V–) and leakage current <150nA. Adding capacitance would slow enable/disable timing and is unnecessary for noise immunity - proper PCB layout and direct connection to clean logic levels suffice.
Can the LTC2068IF#PBF drive a 10kΩ load while maintaining rail-to-rail output swing?
Yes, the LTC2068IF#PBF maintains rail-to-rail output swing into 10kΩ loads. Per Electrical Characteristics tables, VOH (V+ – VOUT) is 7mV max and VOL (VOUT – V–) is 5.5mV max at RL = 10kΩ - confirming <10mV saturation voltage at both rails. This enables full-scale utilization of 1.7V–5.25V supplies in low-power data acquisition systems.
How does the EMI rejection of the LTC2068IF#PBF compare to standard precision op-amps?
The LTC2068IF#PBF provides 90dB EMI rejection at 1.8GHz due to an integrated on-chip filter - a feature absent in most standard precision op-amps like OP07 or ADA4522. This specification is measured as EMIRR = 20·log(VRF/ΔVOS) and directly prevents RF-induced offset shifts in cellular/Wi-Fi environments, eliminating need for external ferrite beads or RC filters.
Is the LTC2068IF#PBF pin-compatible with other devices in the LTC2066/LTC2067/LTC2068 family?
No, the LTC2068IF#PBF is not pin-compatible with LTC2066 or LTC2067 variants due to differing channel counts and package footprints. The LTC2068IF#PBF uses a 14-lead TSSOP, while LTC2066 is SC70/TSOT-23 (5 or 6 pins) and LTC2067 is MSOP/DFN (8 or 10 pins). Pin functions are consistent per channel, but physical layout and pin count differ fundamentally.
LTC2068IF#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 ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LTC2068IF#PBF FAQ
1.How can I place an order for LTC2068IF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2068IF#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 LTC2068IF#PBF reliable?
The price and inventory of LTC2068IF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2068IF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2068IF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2068IF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2068IF#PBF?
LTC2068IF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2068IF#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 LTC2068IF#PBF?
For technical support, including LTC2068IF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2068IF#PBF requirements.
6.How does Aetrix verify that LTC2068IF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2068IF#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 LTC2068IF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2068IF#PBF?
All LTC2068IF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2068IF#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 LTC2068IF#PBF part is unused and in its original packaging.
Return procedure for LTC2068IF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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