Analog Devices Inc. LTC6655LNCHMS8-2.5#TRPBF

Overview

LTC6655LNCHMS8-2.5#TRPBF from Analog Devices is a precision low-noise bandgap voltage reference delivering 2.5V output with ±0.025% initial accuracy, 2ppm/°C max temperature drift, and 0.12ppm_P-P (0.1Hz–10Hz) noise when using the NR pin with 100µF capacitor - optimized for 24-bit+ SAR and delta-sigma ADCs in high-resolution data acquisition systems.

For engineers reviewing the LTC6655LNCHMS8-2.5#TRPBF datasheet, LTC6655LNCHMS8-2.5#TRPBF pinout, LTC6655LNCHMS8-2.5#TRPBF application, or LTC6655LNCHMS8-2.5#TRPBF equivalent, key selection criteria include low-frequency noise performance, load regulation under ±5mA sourcing/sinking, MSOP-8 package thermal hysteresis (30ppm over –40°C to 85°C), and compatibility with precision regulator feedback loops requiring <10ppm/mA load regulation.

Technical Context

The LTC6655LNCHMS8-2.5#TRPBF implements curvature-compensated bandgap architecture with dual-output topology: VOUT_F provides force/sense capability while NR pin enables external capacitor-based wideband noise filtering. It operates across –40°C to 125°C with full specification including line regulation (≤40ppm/V), shutdown current (<20µA), and 500mV dropout.

Its internal 2mA sense current on VOUT_S (not present in LN variant) is replaced by dedicated NR pin functionality; the MSOP-8 package uses star-grounding at Pin 4 and supports both sourcing (±5mA) and sinking (±5mA) with <10ppm/mA load regulation - critical for ratiometric sensor interfaces and closed-loop calibration circuits.

Key Specifications

Pinout & Package

Package: 8-lead plastic MSOP (3mm × 3mm), moisture sensitivity level 1, RoHS-compliant, rated for –40°C to 125°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with ADR4525BRTZ-REEL7 and REF5025IDR, the LTC6655LNCHMS8-2.5#TRPBF delivers superior low-frequency noise performance via its NR pin, tighter initial accuracy than REF5025IDR, and MSOP-8 footprint enabling higher-density PCB layouts - making it optimal for new 24-bit data acquisition and portable medical instrument designs.

Availability

LTC6655LNCHMS8-2.5#TRPBF is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, portable instrumentation, precision battery monitoring, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC6655LNCHMS8-2.5#TRPBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC6655 family was designed specifically for metrology-grade applications demanding ultra-low noise, low drift, and guaranteed specifications across –40°C to 125°C - targeting next-generation precision ADCs, sensor signal chains, and calibration-critical instrumentation.

FAQ

What is the function of the NR pin on the LTC6655LNCHMS8-2.5#TRPBF?

The NR (Noise Reduction) pin on the LTC6655LNCHMS8-2.5#TRPBF accepts an external capacitor (0.1µF to 100µF) to ground, forming a low-pass filter that reduces wideband output voltage noise. With a 100µF capacitor, the LTC6655LNCHMS8-2.5#TRPBF achieves 0.12ppm_P-P (0.1Hz–10Hz), significantly lower than the standard LTC6655-2.5's 0.25ppm_P-P. This feature makes the LTC6655LNCHMS8-2.5#TRPBF ideal for 24-bit+ data converters where noise dominates system resolution.

Does the LTC6655LNCHMS8-2.5#TRPBF require external capacitors, and what values are recommended?

Yes - the LTC6655LNCHMS8-2.5#TRPBF requires a minimum 0.1µF ceramic capacitor between VIN and GND, and an output capacitor between 2.7µF and 100µF on VOUT_F. For optimal noise performance, a 100µF capacitor is recommended on the NR pin. All capacitors must have ESR ≤0.1Ω at 100kHz; X7R ceramics are acceptable for general use, but film capacitors (e.g., PPS or polyester) are preferred in ultra-low-noise applications to avoid piezoelectric artifacts. The LTC6655LNCHMS8-2.5#TRPBF datasheet specifies these values for stability and settling time compliance.

How does the LTC6655LNCHMS8-2.5#TRPBF compare to the standard LTC6655CHMS8-2.5#TRPBF in terms of noise and pinout?

The LTC6655LNCHMS8-2.5#TRPBF replaces the VOUT_S (sense) pin of the standard LTC6655CHMS8-2.5#TRPBF with an NR (noise reduction) pin at Pin 6, while retaining identical VOUT_F (Pin 7), SHDN (Pin 1), VIN (Pin 2), and GND (Pins 3/4/5/8) functions. Its key advantage is 0.12ppm_P-P low-frequency noise (vs 0.25ppm_P-P for the standard version) when using the NR pin with 100µF. Both share ±0.025% initial accuracy and 2ppm/°C drift, but only the LTC6655LNCHMS8-2.5#TRPBF supports active noise filtering.

Can the LTC6655LNCHMS8-2.5#TRPBF operate from a 3.0V supply?

Yes - the LTC6655LNCHMS8-2.5#TRPBF has a 500mV dropout voltage, allowing reliable operation from a 3.0V supply (VIN = VOUT + 0.5V). The datasheet confirms full specification over 3.0V to 13.2V input range, including load regulation, line regulation, and noise performance. At 3.0V input, supply current remains within 5–7mA typical, and shutdown current stays below 20µA - making the LTC6655LNCHMS8-2.5#TRPBF suitable for low-voltage industrial and battery-powered systems.

What is the thermal hysteresis specification for the LTC6655LNCHMS8-2.5#TRPBF in the MSOP-8 package?

The LTC6655LNCHMS8-2.5#TRPBF in the MSOP-8 package exhibits 60ppm thermal hysteresis over the –40°C to 125°C cycle, as specified in the Electrical Characteristics table for "Hysteresis (∆T = –40°C to 125°C)" under LTC6655MS8 conditions. This value reflects mechanical stress-induced voltage shift after extreme temperature cycling and is distinct from the 30ppm hysteresis achieved in the hermetic LS8 package. For applications requiring minimal hysteresis, the LS8 variant (e.g., LTC6655LNCHLS8-2.5#PBF) should be considered - but the LTC6655LNCHMS8-2.5#TRPBF remains appropriate for most industrial DAQ systems where hysteresis contributes <0.006% error.