Analog Devices Inc. LTC6244IDD#PBF

Overview

LTC6244IDD#PBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail output, low-noise CMOS operational amplifier optimized for high-speed photodiode and transducer signal conditioning. It delivers 50MHz gain bandwidth, 40V/μs slew rate, 1.5μV_P-P 0.1Hz–10Hz noise, 1pA input bias current, and operates from 2.8V to 6V single supply or ±5.25V dual supply - enabling precision low-voltage, high-impedance front-end amplification in medical instrumentation and optical sensing.

For engineers reviewing the LTC6244IDD#PBF datasheet, LTC6244IDD#PBF pinout, LTC6244IDD#PBF application, or LTC6244IDD#PBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, DFN-8 (3mm × 3mm) package with exposed pad, rail-to-rail output swing within 35mV of rails, and validated performance in charge-sensitive, low-noise, unity-gain stable configurations.

Technical Context

The LTC6244IDD#PBF employs a folded-cascode input stage with laser-trimmed MOSFETs to achieve ultra-low input bias current and low offset voltage drift (2.5μV/°C max). Its architecture supports full rail-to-rail output swing while maintaining stability at unity gain across capacitive loads up to 100pF when properly compensated.

It features matched dual amplifiers with channel-to-channel V_OS match ≤800μV over –40°C to +85°C, CMRR ≥74dB (0V–3.5V common-mode range), and PSRR ≥75dB - making it suitable for differential signal paths and precision DC-coupled amplification where common-mode rejection and thermal tracking are critical.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad connected to V–. RoHS-compliant, lead-free finish (PBF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-noise op amp applications.

Compared with ADA4898-2ARMZ and OPA2189IDR, the LTC6244IDD#PBF uniquely balances ultra-low 1/f noise, femtoampere input bias, rail-to-rail output, and guaranteed –40°C to +85°C operation in a compact DFN - making it the preferred choice for battery-powered optical and biomedical front-ends requiring both speed and DC fidelity.

Availability

LTC6244IDD#PBF is available at Aetrix Electronics and suitable for photodiode amplifiers, medical instrumentation signal chains, and active filter designs requiring stable component supply with full industrial temperature range support.

Supply support for LTC6244IDD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017.

The LTC6244 product line was designed by Linear Technology specifically for high-speed, low-noise, rail-to-rail op amp applications in precision optical, medical, and industrial sensing - emphasizing unity-gain stability, femtoampere input bias, and robust operation across wide supply and temperature ranges.

FAQ

What is the maximum capacitive load the LTC6244IDD#PBF can drive while maintaining stability?

The LTC6244IDD#PBF is unity-gain stable with capacitive loads up to 100pF when used in standard inverting or non-inverting configurations with proper PCB layout and supply decoupling. For loads >100pF, a series resistor (RS = 10Ω–50Ω) between the output and capacitive node is recommended to suppress peaking, as verified in Figure G30–G32 of the datasheet. This behavior is consistent across the –40°C to +85°C operating range of the LTC6244IDD#PBF.

Does the LTC6244IDD#PBF support true rail-to-rail input common-mode range?

No, the LTC6244IDD#PBF does not support rail-to-rail input. Its input common-mode voltage range extends from V– to (V+ – 1.5V) - for example, 0V to 3.5V on a 5V supply. Exceeding this range (e.g., applying a signal within 1V of V+) may cause instability in unity-gain follower configurations. The LTC6244IDD#PBF maintains rail-to-rail *output* swing, but input range is intentionally limited to optimize noise and offset performance.

How is the exposed thermal pad on the LTC6244IDD#PBF DFN package intended to be connected?

The exposed pad (Pin 9, labeled "EXPOSED PAD (PIN 9) CONNECTED TO V–" in the datasheet) must be soldered to a PCB copper pour tied to the V– net (ground for single-supply operation). This connection is mandatory for thermal dissipation (θ_JA = 43°C/W) and noise performance. Leaving the pad unconnected or floating degrades PSRR, increases junction temperature, and risks parametric shift under sustained load - all confirmed in the LTC6244IDD#PBF thermal and electrical characterization data.

What is the guaranteed input offset voltage specification for the LTC6244IDD#PBF over its full temperature range?

The LTC6244IDD#PBF guarantees a maximum input offset voltage of 650μV over the full –40°C to +85°C operating temperature range (per Electrical Characteristics table on page 3, DD Package, –40°C to 85°C row). At 25°C, the typical value is 100μV, and the maximum is 100μV for the C-grade version - but the I-grade LTC6244IDD#PBF is specified to 650μV max across its qualified temperature range, a key differentiator from commercial-grade variants.

Can the LTC6244IDD#PBF be used with dual ±5V supplies?

Yes, the LTC6244IDD#PBF supports dual ±5V operation (total supply ≤10V), but only the HV variants (e.g., LTC6244HVCDD#PBF) are fully characterized and guaranteed for ±5V. The standard LTC6244IDD#PBF is rated for total supply up to 7V (e.g., +5V/–2V or +6V/0V), and while it may function at ±5V, Analog Devices specifies absolute maximum total supply voltage as 7V for non-HV versions. For guaranteed ±5V operation, LTC6244HVIDD#PBF is the appropriate HV/I-grade variant.