Analog Devices Inc. LTC2379CMS-18#PBF

Overview

LTC2379CMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1.6 Msps successive approximation register (SAR) analog-to-digital converter with ±2 LSB INL max, 101.2 dB SNR at 2 kHz, and digital gain compression (DGC) for single-supply amplifier interfacing. It operates from a 2.5 V analog supply, supports ±V_REF fully differential input (V_REF = 2.5 V to 5.1 V), and consumes only 18 mW at full throughput - enabling high-precision data acquisition in medical imaging and portable instrumentation.

For engineers reviewing the LTC2379CMS-18#PBF datasheet, LTC2379CMS-18#PBF pinout, LTC2379CMS-18#PBF application, or LTC2379CMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation, internal conversion clock eliminating external timing constraints, daisy-chain SPI interface compatibility across 1.8 V–5 V logic levels, and DGC-enabled 0.5 V–4.5 V input range with 5 V reference.

Technical Context

The LTC2379CMS-18#PBF implements a charge-redistribution SAR architecture with a 18-bit CDAC and differential comparator, achieving no pipeline delay and zero cycle latency. Its internal oscillator fixes conversion time at 360–412 ns, decoupling system timing from external clock jitter.

Digital Gain Compression (DGC) is implemented via pin-controlled scaling: when REF/DGC is grounded, the ADC maps 0 V to 0.1·V_REF and V_REF to 0.9·V_REF, preserving full 18-bit resolution while relaxing analog driver supply requirements - e.g., enabling LT6350 operation from a single 5.5 V rail instead of dual supplies.

Key Specifications

Pinout & Package

Package: 16-lead MSOP (4.0 mm × 3.0 mm × 1.1 mm), RoHS-compliant, lead-free finish (#PBF). Exposed pad not present in MSOP variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, high-resolution SAR ADC applications.

Compared with AD7606C-18 and ADS8860, the LTC2379CMS-18#PBF uniquely combines 1.6 Msps throughput, 101.2 dB SNR, ±2 LSB INL, and DGC in a single-channel MSOP package - making it optimal for latency-sensitive, single-input precision acquisition where full 18-bit integrity must be preserved under thermal and supply variation.

Availability

LTC2379CMS-18#PBF is available at Aetrix Electronics and suitable for medical imaging systems, portable instrumentation, and industrial process control requiring stable component supply, extended temperature support (0°C to 70°C), and long-term production continuity.

Supply support for LTC2379CMS-18#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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2379-18 belongs to ADI's precision SAR ADC product line, engineered for applications demanding uncompromised DC accuracy, AC performance, and low-power operation - especially where zero-latency conversion and flexible reference scaling are critical.

FAQ

What is the maximum sampling rate supported by the LTC2379CMS-18#PBF?

The LTC2379CMS-18#PBF supports a maximum sampling rate of 1.6 Msps, with a guaranteed minimum conversion time of 360 ns and no pipeline delay. This rate is achievable across its full operating temperature range (0°C to 70°C) and maintains 101.2 dB SNR and ±2 LSB INL specifications when used with appropriate layout and decoupling per the datasheet guidelines.

How does Digital Gain Compression (DGC) function in the LTC2379CMS-18#PBF?

Digital Gain Compression in the LTC2379CMS-18#PBF is enabled by grounding the REF/DGC pin. When active, the ADC digitally remaps the zero-scale code from 0 V to 0.1·V_REF and full-scale code from V_REF to 0.9·V_REF, resulting in an effective input range of 0.5 V to 4.5 V with a 5 V reference. This preserves all 18 bits of resolution while allowing front-end amplifiers like the LT6350 to operate from a single 5.5 V supply.

What package type and pin count does the LTC2379CMS-18#PBF use?

The LTC2379CMS-18#PBF uses a 16-lead plastic MSOP package (4.0 mm × 3.0 mm × 1.1 mm) with standard gull-wing leads. It does not include an exposed thermal pad - unlike the DFN variant (e.g., LTC2379CDE-18#PBF). The pinout is fully documented in the Linear Technology (now Analog Devices) datasheet revision 237918fb, with pins assigned for VDD, OVDD, differential analog inputs, reference, SPI interface, and control signals including CHAIN and REF/DGC.

Does the LTC2379CMS-18#PBF require an external clock source?

No, the LTC2379CMS-18#PBF features an internal oscillator that sets the conversion timing, eliminating the need for an external clock source. The internal clock ensures consistent 360–412 ns conversion time and removes sensitivity to external clock jitter - simplifying system design and improving aperture uncertainty performance. External timing is only required for the SPI interface (SCK), which operates independently.

What is the guaranteed operating temperature range for the LTC2379CMS-18#PBF?

The LTC2379CMS-18#PBF is specified for operation from 0°C to 70°C (Commercial grade), as indicated by the "C" suffix in the part number and confirmed in the ordering information table of the datasheet. It achieves full performance - including ±2 LSB INL max, 101.2 dB SNR, and 1.6 Msps throughput - across this entire range, with thermal drift parameters (e.g., FSE drift ±0.05 ppm/°C) validated per specification.