Analog Devices Inc. LTC1992-2CMS8#PBF

Overview

LTC1992-2CMS8#PBF from Analog Devices (formerly Linear Technology) is a fixed-gain, fully differential amplifier with precise 2× differential gain, rail-to-rail input/output operation, and independent VOCM-controlled output common-mode voltage. It operates from single 2.7V to dual ±5V supplies, delivers ±10mA output current, and maintains ±0.3% max gain error over –40°C to 85°C - ideal for precision single-ended-to-differential conversion in data acquisition front-ends.

For engineers reviewing the LTC1992-2CMS8#PBF datasheet, LTC1992-2CMS8#PBF pinout, LTC1992-2CMS8#PBF application, or LTC1992-2CMS8#PBF equivalent, key selection criteria include guaranteed 2× gain accuracy, C_LOAD-stable operation up to 10,000pF, low 1mA supply current, adjustable VOCM interface, and MSOP-8 packaging for space-constrained signal conditioning designs.

Technical Context

The LTC1992-2CMS8#PBF implements a fully differential architecture with separate internal common-mode feedback for phase-balanced outputs and reduced second-harmonic distortion. Its fixed 2× gain is set by laser-trimmed on-chip resistors, enabling ultrastable performance without external components.

It supports rail-to-rail input common-mode range (–V_S to +V_S – 1.3V) and provides independent control of output common-mode level via the VOCM pin - decoupling output level shifting from input conditions and simplifying interfacing with ADCs or other differential receivers.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic MSOP (3mm × 3mm), RoHS-compliant lead-free finish (PBF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential amplifier applications.

Compared with AD8138ARMZ and LTC6409IUD#PBF, the LTC1992-2CMS8#PBF uniquely combines precision fixed 2× gain, integrated VOCM control, rail-to-rail DC-coupled operation, and ultra-low 1mA supply current - making it optimal for cost-sensitive, space-constrained, and battery-powered precision instrumentation.

Availability

LTC1992-2CMS8#PBF is available at Aetrix Electronics and suitable for instrumentation signal conditioning, high-speed data acquisition front-ends, and industrial process control I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC1992-2CMS8#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 precision analog portfolio, including high-performance amplifiers, data converters, and power management ICs.

The LTC1992 family was designed specifically for precision differential signal conditioning in DC-coupled, low-power, and space-constrained applications - emphasizing gain accuracy, common-mode flexibility, and load drive capability without external components.

FAQ

What is the guaranteed gain accuracy of the LTC1992-2CMS8#PBF over temperature?

The LTC1992-2CMS8#PBF guarantees ±0.3% maximum differential gain error across the full operating temperature range of –40°C to 85°C. This specification applies to the I-grade version (LTC1992-2IMS8#PBF), which matches the temperature rating of the LTC1992-2CMS8#PBF per Linear Technology's ordering matrix. The gain stability is achieved using laser-trimmed on-chip resistors, eliminating drift-related calibration in production systems.

Can the LTC1992-2CMS8#PBF operate from a single 3.3V supply?

Yes, the LTC1992-2CMS8#PBF supports single-supply operation from 2.7V to 11V. At 3.3V, it maintains rail-to-rail input common-mode range (–0.1V to 2.0V) and delivers rail-to-rail output swing with ±10mA drive capability. The VMID pin provides a stable ~2.5V reference only at +VS = 5V; at 3.3V, VOCM must be externally driven to set the desired output common-mode level for the LTC1992-2CMS8#PBF.

Does the LTC1992-2CMS8#PBF require external compensation for capacitive loads?

No, the LTC1992-2CMS8#PBF is internally compensated and remains stable with capacitive loads up to 10,000pF. This eliminates the need for series isolation resistors or external compensation networks when driving ADC inputs, long PCB traces, or cables - a key advantage over many general-purpose op amps that oscillate under similar conditions.

What is the function of the VMID pin on the LTC1992-2CMS8#PBF?

On the LTC1992-2CMS8#PBF, the VMID pin provides an internal buffered mid-supply voltage reference. When +VS = 5V and –VS = 0V, VMID outputs 2.50V ±60mV and can source/sink up to 10μA. It is not intended as a precision reference but serves as a convenient bias point for input coupling networks or as a diagnostic monitor - distinct from the actively controlled VOCM pin used for output common-mode setting.

How does the VOCM pin affect output common-mode voltage in the LTC1992-2CMS8#PBF?

The VOCM pin on the LTC1992-2CMS8#PBF directly sets the output common-mode voltage (V_OUTCM) as (+V_OUT + –V_OUT)/2, independent of input common-mode voltage. For example, applying 1.5V to VOCM forces V_OUTCM = 1.5V regardless of whether the input is centered at 0V or 2.5V - enabling seamless level shifting between different supply domains without altering gain or signal integrity in the LTC1992-2CMS8#PBF.