Analog Devices Inc. LTC2391HLX-16#PBF

Overview

LTC2391HLX-16#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with ±4.096V fully differential input range, ±2LSB INL (max), 94dB SNR (typ), and integrated 4.096V reference. It operates from a single 5V supply with 1.8V–5V I/O compatibility and supports industrial high-temperature operation up to 125°C - ideal for precision data acquisition in medical imaging and ATE systems.

For engineers reviewing the LTC2391HLX-16#PBF datasheet, LTC2391HLX-16#PBF pinout, LTC2391HLX-16#PBF application, or LTC2391HLX-16#PBF equivalent, key selection considerations include guaranteed 16-bit no-missing-codes performance, internal reference tempco (±20ppm/°C max), parallel/serial interface flexibility, nap/sleep power-down modes, and LQFP-48 package suitability for thermally demanding embedded signal chains.

Technical Context

The LTC2391HLX-16#PBF implements a charge-redistribution SAR architecture with internal oscillator-based timing, eliminating external clock dependencies. Its fully differential input stage accepts ±V_REF signals with 70dB CMRR and 50MHz –3dB bandwidth, while the precision internal reference delivers 4.096V ±0.5% initial accuracy and ±20ppm/°C max drift over –40°C to +125°C.

It supports zero-cycle-latency conversion in both parallel and serial modes, with BUSY-driven data-ready signaling and configurable output formats (offset binary or two's complement via OB/2C). Acquisition time is 1485ns and conversion time is 2500ns at 250ksps, enabling deterministic real-time sampling without pipeline delay.

Key Specifications

Pinout & Package

Package: 48-lead 7mm × 7mm plastic LQFP (LX), exposed pad (Pin 49) tied to GND. Rated for –40°C to +125°C operation with θ_JA = 55°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 16-bit SAR ADC applications.

Compared with ADS8860IRGET and AD7606C-16BSTZ, the LTC2391HLX-16#PBF uniquely combines single-channel 250ksps performance, 94dB SNR, ±2LSB INL, internal ±20ppm/°C reference, parallel/serial flexibility, and guaranteed 125°C operation - making it optimal for thermally rugged, high-fidelity single-signal digitization where interface adaptability and deterministic timing are critical.

Availability

LTC2391HLX-16#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, high-speed industrial ATE systems, and DSP-based vibration monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2391HLX-16#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 LTC2391HLX-16#PBF belongs to ADI's legacy Linear Technology precision SAR ADC product line, engineered specifically for high-dynamic-range, low-latency data acquisition in thermally demanding embedded systems where accuracy, reliability, and interface flexibility are non-negotiable.

FAQ

What is the operating temperature range of the LTC2391HLX-16#PBF?

The LTC2391HLX-16#PBF is rated for continuous operation from –40°C to +125°C ambient temperature, with junction temperature limited to 150°C. This H-grade qualification makes it suitable for under-hood automotive, downhole oil/gas, and industrial control applications where thermal robustness is mandatory. The device maintains full 16-bit no-missing-codes performance and specified SNR/INL across this entire range.

Does the LTC2391HLX-16#PBF require an external reference?

No, the LTC2391HLX-16#PBF includes a precision internal 4.096V reference with ±0.5% initial accuracy and ±20ppm/°C max temperature coefficient - sufficient for most high-accuracy applications. To use it, simply tie REFOUT and REFIN together and leave REFSENSE floating. An external reference may be used via REFIN if tighter initial accuracy (<0.05%) or lower tempco (<10ppm/°C) is required.

How does the LTC2391HLX-16#PBF handle interface selection between parallel and serial modes?

The LTC2391HLX-16#PBF uses the SER/PAR pin (Pin 4) to select interface mode: logic low enables 16-bit parallel output on D0–D15, while logic high enables serial communication via SDIN/SDOUT/SCLK. In serial mode, non-active parallel outputs enter high-impedance state. Both modes support zero-cycle-latency readout triggered by BUSY↓, ensuring deterministic timing regardless of interface choice.

What power-saving features does the LTC2391HLX-16#PBF offer?

The LTC2391HLX-16#PBF provides two low-power states: Nap mode (IDD ≈ 25μA) and Sleep mode (IDD ≈ 19μA), activated via the PD pin (Pin 33). Both modes retain register settings and reference bias, allowing fast wake-up (<1μs) without recalibration. At full 250ksps operation, it consumes only 95mW - significantly lower than competing 16-bit SAR ADCs with similar performance.

Can the LTC2391HLX-16#PBF accept single-ended input signals?

The LTC2391HLX-16#PBF has fully differential inputs (IN+, IN–) and does not support true single-ended operation. However, single-ended signals can be converted to differential format using recommended drivers like the LT6350 (shown in Figure 4a of the datasheet) or dual-op-amp circuits (e.g., LT1806). These interfaces maintain common-mode rejection and preserve the ADC's 94dB SNR and ±2LSB INL specifications when properly designed and laid out.