Analog Devices Inc. LTC2377CDE-20#PBF

Overview

LTC2377CDE-20#PBF from Analog Devices (formerly Linear Technology) is a 20-bit, 500ksps 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 ±VREF fully differential input ranges with VREF from 2.5V to 5.1V, targeting high-precision data acquisition in portable instrumentation and medical imaging systems.

For engineers reviewing the LTC2377CDE-20#PBF datasheet, LTC2377CDE-20#PBF pinout, LTC2377CDE-20#PBF application, or LTC2377CDE-20#PBF equivalent, key selection criteria include guaranteed 20-bit no-missing-codes performance, daisy-chain SPI interface compatibility across 1.8V–5V logic levels, internal conversion clock, and DGC-enabled 0.5V–4.5V input range with 5V reference.

Technical Context

The LTC2377CDE-20#PBF implements a charge-redistribution SAR architecture with a 20-bit CDAC and differential comparator, achieving zero cycle latency and no pipeline delay. Its conversion timing is governed by an internal oscillator, eliminating external clock dependency while supporting precise sampling control via the CNV input.

Digital gain compression (DGC) is implemented as a post-conversion digital scaling function that remaps zero-scale from 0V to 0.1·VREF and full-scale from VREF to 0.9·VREF-enabling rail-to-rail input swing without requiring negative supply for driving amplifiers. The device features a 16-pin 4mm × 3mm DFN package with exposed pad (Pin 17 = GND), rated for 0°C to 70°C operation.

Key Specifications

Pinout & Package

Package: 16-lead (4mm × 3mm) plastic DFN with exposed thermal 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 ADS127L01IRSBT and AD7626BCPZ, the LTC2377CDE-20#PBF uniquely balances 20-bit no-missing-codes integrity, 500ksps speed, and DGC-enabled single-supply analog interface-making it optimal for portable, high-fidelity signal acquisition where resolution, speed, and power efficiency are simultaneously critical.

Availability

LTC2377CDE-20#PBF is available at Aetrix Electronics and suitable for medical imaging front-ends, portable precision instrumentation, and industrial process control systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LTC2377CDE-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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2377CDE-20#PBF belongs to ADI's legacy Linear Technology precision SAR ADC product line, designed specifically for applications demanding 20-bit accuracy, low power, and robust noise immunity in space- and power-constrained environments.

FAQ

What is the operating temperature range for the LTC2377CDE-20#PBF?

The LTC2377CDE-20#PBF is specified for commercial temperature operation from 0°C to 70°C. This grade is validated per the datasheet's LTC2377C ordering option and reflects guaranteed performance-including ±2ppm INL max, 104dB SNR, and 500ksps throughput-across the full 0°C to 70°C ambient range with appropriate PCB thermal design and decoupling.

Does the LTC2377CDE-20#PBF require an external clock for conversion timing?

No, the LTC2377CDE-20#PBF uses an internal oscillator to set conversion time, eliminating the need for an external clock source. This simplifies system timing design and reduces jitter sensitivity. The CNV input controls conversion initiation, and BUSY indicates completion-allowing fully autonomous operation without external timing constraints beyond the CNV trigger edge.

How does Digital Gain Compression (DGC) work in the LTC2377CDE-20#PBF?

Digital Gain Compression (DGC) in the LTC2377CDE-20#PBF is activated by grounding the REF/DGC pin. It digitally remaps the zero-scale code from 0V to 0.1·V_REF and full-scale from V_REF to 0.9·V_REF, resulting in an effective input range of 0.5V–4.5V with a 5V reference. This preserves full 20-bit resolution while allowing the driving amplifier to operate from a single 5.5V supply instead of requiring dual rails.

What package type and thermal considerations apply to the LTC2377CDE-20#PBF?

The LTC2377CDE-20#PBF uses a 16-lead 4mm × 3mm plastic DFN package with an exposed thermal pad (Pin 17). That pad must be soldered directly to the PCB ground plane for thermal and electrical performance. With θ_JA = 40°C/W, proper copper area and via count under the pad are essential to maintain junction temperature within the 150°C absolute maximum during continuous 500ksps operation.

Can the LTC2377CDE-20#PBF interface directly with a 1.8V microcontroller SPI port?

Yes, the LTC2377CDE-20#PBF supports 1.8V logic levels via its OVDD pin. When OVDD = 1.8V, the SCK, RDL/SDI, and BUSY inputs recognize VIH ≥ 1.44V and VIL ≤ 0.36V, while SDO outputs VOH ≥ 1.6V and VOL ≤ 0.2V-ensuring reliable communication with 1.8V SPI masters without level shifters. The daisy-chain mode further enables multi-ADC synchronization on the same bus.