Analog Devices Inc. LTC6084HDD#PBF

Overview

LTC6084HDD#PBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail input/output CMOS operational amplifier optimized for precision, low-power signal conditioning in harsh-temperature environments. It delivers 1.5MHz gain bandwidth, 0.5V/μs slew rate, 750μV max offset voltage, 110μA per amplifier supply current, and operates from 2.5V to 5.5V across –40°C to 125°C - enabling use in automotive sensor front-ends, portable medical instrumentation, and industrial data acquisition systems.

For engineers reviewing the LTC6084HDD#PBF datasheet, LTC6084HDD#PBF pinout, LTC6084HDD#PBF application, or LTC6084HDD#PBF equivalent, key selection criteria include its 1pA typical input bias current at 25°C, shutdown capability (1.1μA per amp), rail-to-rail swing within 5mV of rails, 70dB min CMRR, and DFN-10 package with exposed V– pad for thermal and noise performance.

Technical Context

The LTC6084HDD#PBF integrates complementary PMOS/NMOS input stages to achieve true rail-to-rail common-mode input range (V– to V+), with seamless transition between transistor pairs near 0.9V–1.3V below V+. Its class AB output stage enables 7.7mA short-circuit current while maintaining 5mV rail saturation under no-load conditions.

Shutdown control is implemented via two dedicated active-low pins (SHDNA, SHDNB) - unique to the DFN-10 package - pulling high internally when floating. In shutdown, outputs enter high-impedance state and quiescent current drops to ≤1.1μA per amplifier, supporting muxed-output architectures and battery-powered duty-cycling.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 3mm) plastic DFN with exposed V– pad (pin 11), requiring soldering to PCB ground plane for optimal thermal dissipation (θ_JA = 43°C/W) and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC6084HMS8#PBF, the LTC6084HDD#PBF adds independent shutdown control and superior thermal performance, while LTC6081HDD#PBF improves DC accuracy without sacrificing power or package compatibility - making it a drop-in upgrade for higher-precision variants.

Availability

LTC6084HDD#PBF is available at Aetrix Electronics and suitable for automotive cabin sensing, portable medical instrumentation, and industrial data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC6084HDD#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog ICs for precision, power, and signal integrity applications.

The LTC6084 series belongs to Linear's rail-to-rail precision op-amp product line, designed specifically for low-power, wide-temperature industrial and automotive signal conditioning where input bias current, offset stability, and supply flexibility are critical.

FAQ

What is the maximum input common-mode voltage range for LTC6084HDD#PBF?

The LTC6084HDD#PBF supports a rail-to-rail input common-mode range from V– to V+, verified across its full –40°C to 125°C operating temperature range. This is achieved via a composite PMOS/NMOS input stage that transitions seamlessly near 0.9V–1.3V below V+, enabling direct interfacing with sensors operating at either supply rail without level shifting.

Does LTC6084HDD#PBF require external pull-up resistors on SHDNA and SHDNB pins?

No - the LTC6084HDD#PBF includes internal current sources that pull SHDNA and SHDNB to V+ when left unconnected, enabling normal operation without external components. External pull-downs (to V– or logic low) are only needed to actively assert shutdown; floating pins default to enabled state.

Can LTC6084HDD#PBF drive capacitive loads, and what is the limit?

Yes - the LTC6084HDD#PBF can drive up to 300pF in unity-gain configuration without instability, as confirmed by capacitive load overshoot testing. Performance improves with higher closed-loop gain, and adding a small series resistor (e.g., 10Ω–50Ω) between output and load further increases usable capacitance, supporting direct connection to ADC input capacitors or long PCB traces.

How does the exposed pad on LTC6084HDD#PBF function electrically and thermally?

The exposed pad (pin 11) of the LTC6084HDD#PBF is internally connected to V– and must be soldered to a PCB copper pour tied to the system V–/ground plane. This provides both low-thermal-resistance path (θ_JA = 43°C/W) and low-inductance return path for input bias currents, directly improving PSRR, noise immunity, and high-temperature reliability.

Is LTC6084HDD#PBF suitable for pH probe amplification, and what layout precautions apply?

Yes - the 1pA typical input bias current and rail-to-rail input make LTC6084HDD#PBF well-suited for pH probe interfaces. To preserve this performance, implement a guard ring around +INA/–INA traces, driven at the same potential as the inputs (e.g., via op-amp output in unity-gain buffer), and avoid routing high-voltage or high-impedance traces near inputs to prevent board leakage (>100GΩ surface resistance required).