Analog Devices Inc. LTC2376CDE-20#PBF

Overview

LTC2376CDE-20#PBF from Analog Devices (formerly Linear Technology) is a 20-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with ±0.5ppm typical integral nonlinearity, 104dB SNR at 2kHz, and digital gain compression (DGC) for single-supply amplifier interfacing. It operates from a 2.5V analog supply and supports ±V_REF fully differential input ranges with V_REF from 2.5V to 5.1V, targeting high-precision data acquisition in medical imaging and portable instrumentation.

For engineers reviewing the LTC2376CDE-20#PBF datasheet, LTC2376CDE-20#PBF pinout, LTC2376CDE-20#PBF application, or LTC2376CDE-20#PBF equivalent, key selection criteria include guaranteed 20-bit no-missing-codes performance, daisy-chain SPI interface compatibility across 1.8V–5V logic, internal conversion clock, and DGC-enabled 0.5V–4.5V input range with 5V reference.

Technical Context

The LTC2376CDE-20#PBF implements a charge-redistribution SAR architecture with a 20-bit CDAC and differential comparator, achieving no pipeline delay and zero cycle latency. Its conversion timing is governed by an internal oscillator, eliminating external clock dependency while maintaining precise 4µs conversion cycle time at 250ksps.

Digital gain compression (DGC) is implemented via on-chip digital scaling that remaps zero-scale from 0V to 0.1·V_REF and full-scale from V_REF to 0.9·V_REF, enabling rail-to-rail input swing compatibility with single 5.5V-powered op-amps without negative supply rails.

Key Specifications

Pinout & Package

Package: 16-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 17 = GND), rated for 0°C to 70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1287IRHBT and AD7960BCPZ-RL7, the LTC2376CDE-20#PBF uniquely balances 20-bit resolution, 250 ksps throughput, and DGC-enabled single-supply operation-making it optimal for portable, battery-constrained, high-fidelity acquisition where both speed and precision are non-negotiable.

Availability

LTC2376CDE-20#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, portable high-resolution data acquisition, and industrial process monitoring requiring stable component supply and guaranteed 20-bit no-missing-codes performance.

Supply support for LTC2376CDE-20#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2376-20 product line was designed for high-precision, low-power, high-speed data acquisition systems demanding 20-bit accuracy without pipeline latency-targeting applications where resolution, speed, and power efficiency intersect.

FAQ

What is the maximum sampling rate of the LTC2376CDE-20#PBF?

The LTC2376CDE-20#PBF achieves a maximum sampling rate of 250 ksps with no cycle latency. This is enabled by its internal conversion clock and optimized SAR architecture, allowing deterministic timing without external clock synchronization. At this rate, the device consumes 5.3 mW and maintains 104 dB SNR and ±2 ppm INL maximum. The LTC2376CDE-20#PBF supports lower rates down to 250 sps, where power drops to 5.3 µW via automatic power-down.

Does the LTC2376CDE-20#PBF require an external reference voltage?

Yes, the LTC2376CDE-20#PBF requires an external reference voltage applied to the REF pin, which must be in the range of 2.5 V to 5.1 V. The reference directly defines the full-scale differential input range (±V_REF). The device does not include an internal reference; however, it features digital gain compression (DGC) that modifies how the reference maps to input range when REF/DGC is grounded. The LTC2376CDE-20#PBF draws up to 0.3 mA reference current, which scales with sampling rate.

How does digital gain compression (DGC) work on the LTC2376CDE-20#PBF?

Digital gain compression (DGC) on the LTC2376CDE-20#PBF is activated by tying the REF/DGC pin to GND. This causes the ADC to digitally remap zero-scale from 0 V to 0.1·V_REF and full-scale from V_REF to 0.9·V_REF, resulting in an effective input range of 0.1·V_REF to 0.9·V_REF. With a 5 V reference, this yields a 0.5 V–4.5 V span, enabling use of single-supply op-amps (e.g., powered from 5.5 V) without negative rails. The LTC2376CDE-20#PBF preserves full 20-bit resolution and linearity under DGC mode.

What package type and temperature grade does the LTC2376CDE-20#PBF use?

The LTC2376CDE-20#PBF uses a 16-lead (4 mm × 3 mm) plastic DFN package with an exposed thermal pad (Pin 17 = GND), requiring soldering to the PCB ground plane for thermal and electrical performance. It is specified for commercial temperature operation from 0°C to 70°C. This contrasts with the MSOP variants (e.g., LTC2376CMS-20#PBF) and industrial-grade DFN versions (e.g., LTC2376IDE-20#PBF), which operate from –40°C to 85°C.

Is the LTC2376CDE-20#PBF compatible with standard SPI interfaces?

Yes, the LTC2376CDE-20#PBF features a SPI-compatible serial interface supporting 1.8 V, 2.5 V, 3.3 V, and 5 V logic levels via the OVDD supply. It operates in standard SPI mode (with RDL/SDI as bus-enable) or daisy-chain mode (with RDL/SDI as serial data input when CHAIN = high). Data is output MSB-first on SDO, synchronized to SCK rising edges. The LTC2376CDE-20#PBF does not require CS/SS signaling - BUSY and CNV provide timing control instead.