Analog Devices Inc. LTC6244CDD#PBF

Overview

LTC6244CDD#PBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail output, unity-gain stable CMOS operational amplifier optimized for low-noise, high-speed signal conditioning. It delivers 50MHz gain bandwidth, 40V/μs slew rate, 1pA input bias current, 1.5μV_P-P 0.1Hz–10Hz noise, and operates from 2.8V to 6V single supply - ideal for photodiode amplification in precision optical sensing systems.

For engineers reviewing the LTC6244CDD#PBF datasheet, LTC6244CDD#PBF pinout, LTC6244CDD#PBF application, or LTC6244CDD#PBF equivalent, key selection criteria include its ultra-low input bias current for high-impedance transducer interfaces, guaranteed rail-to-rail output swing within 35mV of rails, and DFN-8 package suitability for space-constrained analog front-ends in medical instrumentation and active filter designs.

Technical Context

The LTC6244CDD#PBF employs a folded-cascode input stage with laser-trimmed MOSFETs to achieve low offset voltage (100μV max) and drift (2.5μV/°C max), while maintaining rail-to-rail output swing via complementary PMOS/NMOS output transistors. Its input common-mode range extends to the negative rail, enabling true single-supply operation down to 2.8V.

It features low input capacitance (2.1pF differential), high CMRR (74dB min), and robust stability into capacitive loads - validated by full-power bandwidth of 3.7MHz at 3V_P-P output and 0.1% settling time of 535ns. The device is specified over 0°C to 70°C and qualified for industrial-grade reliability.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 3mm) plastic DFN (DD package), exposed pad connected to V– (PCB connection optional). Thermal resistance θ_JA = 43°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADA4898-2ARMZ and OPA2189IDGKR, the LTC6244CDD#PBF uniquely balances 50MHz bandwidth, 1pA bias current, and 3V operation - making it the only option among the three that simultaneously meets photodiode TIA, active filter, and portable medical sensor requirements without trade-offs in speed, noise, or supply voltage.

Availability

LTC6244CDD#PBF is available at Aetrix Electronics and suitable for photodiode amplifiers, active filter stages, and medical instrumentation requiring stable component supply with guaranteed 0°C to 70°C performance and lead-free DFN packaging.

Supply support for LTC6244CDD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC6244 product line was designed specifically for high-speed, low-noise, rail-to-rail op amp applications in precision analog front-ends - targeting photodiode amplification, active filtering, and medical instrumentation where speed, noise, and input bias current are critical.

FAQ

What is the maximum operating temperature range for the LTC6244CDD#PBF?

The LTC6244CDD#PBF is specified for operation from 0°C to 70°C ambient temperature. It is part of the 'C' grade variant, which guarantees full electrical performance across this commercial temperature range. While functional outside this range, parameters such as input offset voltage drift (2.5μV/°C max) and gain bandwidth (50MHz) are only assured within 0°C–70°C per the datasheet specifications.

Does the LTC6244CDD#PBF support true single-supply operation with input signals referenced to ground?

Yes, the LTC6244CDD#PBF supports true single-supply operation: its input common-mode voltage range extends to the negative rail (V–), allowing ground-referenced inputs. In a 5V system (V+ = 5V, V– = 0V), +IN and –IN accept signals from 0V up to 3.5V. This eliminates the need for level-shifting circuitry in sensor interfaces like photodiode TIAs where the anode is grounded.

How does the LTC6244CDD#PBF handle capacitive loads, and what is the recommended layout practice?

The LTC6244CDD#PBF exhibits stable behavior with moderate capacitive loads (<100pF) when used in unity-gain configurations. For larger loads, series output resistance (e.g., 10Ω–50Ω) between the output and load is recommended to suppress overshoot. Layout best practices include minimizing trace length to the output pin, using the exposed pad for thermal and grounding integrity, and separating analog input traces from noisy digital routing to preserve 1.5μV_P-P low-frequency noise performance.

Is the LTC6244CDD#PBF pin-compatible with other variants in the LTC6244 family, such as the MS8 package version?

No, the LTC6244CDD#PBF (DFN-8) is not pin-compatible with the LTC6244CMS8#PBF (MSOP-8). Although both packages contain 8 pins and share identical pin functions (OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B), their physical pinouts differ: the DFN places V– on Pin 4 and V+ on Pin 5, while the MSOP places V– on Pin 4 and V+ on Pin 8. PCB layout must be redesigned when switching between these packages.

What is the typical supply current per amplifier for the LTC6244CDD#PBF at 5V supply?

The typical supply current per amplifier for the LTC6244CDD#PBF is 7.4mA at V_S = 5V and T_A = 25°C. Total quiescent current for the dual amplifier is therefore ~14.8mA. This value increases slightly at elevated temperatures and decreases to ~6.25mA at minimum 2.8V supply, enabling optimization for battery life in portable instrumentation without sacrificing bandwidth or noise performance.