Analog Devices Inc. DC1805A-A

Overview

LTC6362 from Analog Devices (formerly Linear Technology) is a precision, low-power, fully differential op amp optimized as a SAR ADC driver. It delivers 200 µV max input-referred offset voltage, 3.9 nV/√Hz input noise, 180 MHz gain-bandwidth product, and rail-to-rail input/output swing on a single 2.8 V to 5.25 V supply - enabling high-accuracy signal conditioning in battery-powered instrumentation and industrial data acquisition systems.

For engineers reviewing the LTC6362 datasheet, LTC6362 pinout, LTC6362 application, or LTC6362 equivalent, key selection criteria include its 1 mA active supply current, 70 µA shutdown mode, 550 ns settling to 18-bit (4 ppm), –116 dBc HD2 at 1 kHz, and dual-package availability in 8-lead MSOP and 3 mm × 3 mm DFN for space-constrained PCB layouts.

Technical Context

The LTC6362 implements a fully differential architecture with independent common-mode feedback via the VOCM pin, enabling precise output common-mode control regardless of input common-mode voltage or gain configuration. Its internal resistor divider sets VOCM = 2.5 V when unconnected under 5 V supply, and it supports external overdrive for ADC reference alignment.

It operates in single-ended-to-differential, inverting, or noninverting modes with stable performance up to 34 MHz (–3 dB bandwidth) and 180 MHz GBWP. Input bias current remains below ±260 nA over –40°C to 125°C, and rail-to-rail inputs accept VICM from V– to V+, supporting ground-referenced sensor interfaces without level-shifting circuitry.

Key Specifications

Pinout & Package

The LTC6362 is available in two RoHS-compliant packages: 8-lead MSOP (3 mm × 3 mm, 0.85 mm height) and 3 mm × 3 mm 8-lead DFN with exposed V– pad (Pin 9). Both support –40°C to 125°C operation (H-grade).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8138ARZ and THS4561IRGET, the LTC6362 uniquely balances ultra-low power (1 mA), precision (200 µV offset), and programmable VOCM control - making it the optimal choice for portable, high-resolution SAR-based data acquisition where supply efficiency and ADC interface flexibility are co-primary constraints.

Availability

LTC6362 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and medical patient monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC6362 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, serving industrial, automotive, communications, and healthcare markets.

The LTC6362 belongs to ADI's precision signal conditioning portfolio, designed specifically for low-power, high-accuracy SAR ADC driver applications where DC precision, noise, and power efficiency are simultaneously critical.

FAQ

What is the maximum operating temperature range certified for the LTC6362?

The LTC6362H variant is fully specified and guaranteed over –40°C to +125°C ambient temperature, with junction temperature limited to 150°C. This rating applies to both MSOP and DFN packages and is validated per JEDEC JESD22-A108. The LTC6362 is qualified for use in uncooled industrial enclosures and automotive under-hood environments where thermal margins are constrained.

Can the LTC6362 drive the LTC2379-18 ADC directly without external components?

Yes - the LTC6362 is explicitly characterized and recommended for driving the LTC2379-18 18-bit SAR ADC. Its 550 ns settling time to 18-bit (4 ppm), low distortion (–116 dBc HD2), and rail-to-rail outputs match the ADC's 1.6 Msps sampling rate and 8 V_P-P differential input range. A typical interface uses 35.7 Ω series resistors per output and 0.1 µF VOCM bypass, as shown in the LTC6362 datasheet Figure TA01a.

How does the VOCM pin function when left unconnected?

When the VOCM pin is left floating, an internal resistor divider establishes a default output common-mode voltage of 2.475 V to 2.525 V (typical 2.5 V) with a 5 V supply, and 1.475 V to 1.525 V with a 3 V supply. This self-biasing eliminates the need for external biasing circuitry in mid-supply-referenced ADC applications, reducing BOM count and layout complexity while maintaining ±6 mV V_OSCM over temperature.

What is the minimum load resistance the LTC6362 can drive while maintaining 18-bit settling?

The LTC6362 maintains 550 ns 18-bit settling into 1 kΩ differential load (500 Ω per output), as verified in the datasheet's TA01b FFT and settling plots. Driving lower impedances (e.g., 300 Ω) increases output current demand and may degrade settling due to increased slew-rate limiting and output stage thermal effects - consult the "Output Short-Circuit Current" (25 mA min) and "Slew Rate" (45 V/µs) specs to ensure margin.

Does the LTC6362 require external compensation capacitors for stability?

No - the LTC6362 is unity-gain stable and does not require external compensation capacitors. Its internal compensation ensures phase margin >60° across all gains (G = 1 to G = 100) and loads ≤10 pF per output. For capacitive loads >10 pF to ground (or >5 pF differentially), add 10–100 Ω series resistance at each output to isolate the capacitance and prevent peaking or oscillation, as detailed in the Applications Information section.