Analog Devices Inc. LTC2068IUD#PBF

Overview

LTC2068IUD#PBF from Analog Devices is a quad-channel, zero-drift, rail-to-rail input/output operational amplifier optimized for ultra-low-power, high-precision signal conditioning. 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 85°C - enabling accurate DC-coupled measurements in energy-constrained sensor nodes and portable instrumentation.

For engineers reviewing the LTC2068IUD#PBF datasheet, LTC2068IUD#PBF pinout, LTC2068IUD#PBF application, or LTC2068IUD#PBF equivalent, this page provides verified package mapping (16-lead 3mm × 3mm QFN), confirmed shutdown functionality (170 nA max), EMI rejection at 1.8 GHz (90 dB), and precise parameter boundaries for low-voltage (1.7 V) operation and high-impedance feedback design.

Technical Context

The LTC2068IUD#PBF employs auto-zeroing and chopper-stabilized architecture with 25 kHz internal chopping frequency to eliminate 1/f noise and minimize DC errors. Its self-calibrating circuitry operates continuously without idle tones, supporting stable closed-loop gain up to 100 kHz (GBW) while maintaining rail-to-rail input common-mode range (V– – 0.1 V to V+ + 0.1 V) and output swing within 0.15 mV of rails (at RL = 499 kΩ).

Each of its four amplifiers features independent shutdown control referenced to V–, with logic-high threshold ≥1.8 V and logic-low ≤0.8 V. The exposed thermal pad (Pin 17) must be connected to V– to ensure θJA = 68°C/W and reliable operation under continuous load.

Key Specifications

Pinout & Package

Package: 16-lead (3 mm × 3 mm) plastic QFN with exposed thermal pad (Pin 17). Pin 17 must be soldered to V– for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op-amp applications.

Compared with AD8628ARZ-REEL7 and MCP6V84-E/SL, the LTC2068IUD#PBF uniquely combines quad integration, nanowatt shutdown, sub-0.05 µV/°C drift, and certified 1.8 GHz EMI rejection - making it the only option for compact, battery-free, high-accuracy sensor nodes operating in RF-rich environments.

Availability

LTC2068IUD#PBF is available at Aetrix Electronics and suitable for portable instrumentation systems, wireless mesh networks, and energy harvesting applications requiring stable component supply across extended product lifecycles.

Supply support for LTC2068IUD#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 precision measurement, industrial automation, and communications markets.

The LTC2068IUD#PBF belongs to the LTC® zero-drift op-amp family, engineered specifically for ultra-low-power, high-accuracy signal chains in battery-operated and energy-harvesting systems.

FAQ

What is the absolute maximum supply voltage for the LTC2068IUD#PBF?

The LTC2068IUD#PBF has an absolute maximum total supply voltage (V+ to V–) of 5.5 V. Exceeding this rating may cause permanent damage. Operation is specified from 1.7 V to 5.25 V, with PSRR guaranteed across that full range. For robust design, maintain ≥0.3 V headroom between input pins and supply rails.

Does the LTC2068IUD#PBF require external capacitors on the SHDN pin?

No, the LTC2068IUD#PBF does not require external capacitors on the SHDN pin. Its shutdown control is CMOS-compatible with low input leakage (<20 nA), and the internal threshold is referenced to V–. However, a 100 kΩ pull-down to V– is recommended if the pin is not actively driven to prevent floating states that could induce erratic behavior.

Can the LTC2068IUD#PBF drive a 10 kΩ load while maintaining rail-to-rail output swing?

Yes, the LTC2068IUD#PBF maintains rail-to-rail output swing into 10 kΩ loads: VOH is ≤15 mV below V+ and VOL is ≤15 mV above V– at TA = 25°C. At –40°C to 85°C, worst-case swing degrades to ≤20 mV from rails - sufficient for 12-bit ADC interfacing with 1.8 V supply and 0.9 V full-scale range.

How is the exposed thermal pad (Pin 17) of the LTC2068IUD#PBF connected?

The exposed thermal pad (Pin 17) of the LTC2068IUD#PBF must be soldered directly to the V– net on the PCB. This connection is mandatory for thermal performance (θJA = 68°C/W) and electrical stability. Do not leave it floating or connect it to ground unless V– is at ground potential - incorrect pad connection risks thermal runaway and output saturation.

Is the LTC2068IUD#PBF suitable for driving ADC reference buffers in low-power systems?

Yes, the LTC2068IUD#PBF is well-suited for ADC reference buffering due to its 140 dB open-loop gain, <1.7 µV_P–P input noise (DC–10 Hz), and ability to source/sink ≥16 mA. Its 10 µA supply current and shutdown mode allow it to buffer precision references only during conversion windows - reducing average power in systems like SAR ADCs with intermittent sampling.