Analog Devices Inc. LTC2385IUH-18#PBF

Overview

LTC2385IUH-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 5 Msps successive approximation register (SAR) analog-to-digital converter with serial LVDS interface, ±4.096 V differential input range, 95.7 dB SNR at 1 MHz, and –40°C to +85°C industrial temperature rating-designed for high-speed imaging, instrumentation, and control loop acquisition systems.

For engineers reviewing the LTC2385IUH-18#PBF datasheet, LTC2385IUH-18#PBF pinout, LTC2385IUH-18#PBF application, or LTC2385IUH-18#PBF equivalent, key selection criteria include no pipeline latency, guaranteed 18-bit no-missing-codes operation, internal 2.048 V reference with ±20 ppm/°C max drift, 32-pin 5 mm × 5 mm QFN package, and dual-mode LVDS output (one- or two-lane).

Technical Context

The LTC2385IUH-18#PBF implements a true SAR architecture with zero-cycle latency and no pipeline delay, enabling deterministic timing for closed-loop control. Its fully differential input stage supports 200 MHz –3 dB bandwidth and 75 dB CMRR at 1 MHz, while internal 2× reference buffer delivers 4.096 V output with ±0.6 LSB INL contribution.

Conversion is initiated by LVDS or CMOS-compatible CNV+ edge; sampling occurs on rising edge with tAP = 0 ns jitter specification. The serial LVDS interface operates at up to 1 Gbps per lane in two-lane mode, reducing data bus width versus parallel interfaces while maintaining full 5 Msps throughput.

Key Specifications

Pinout & Package

Package: 32-lead (5 mm × 5 mm) plastic QFN (UH), exposed pad (Pin 33) required to be soldered to PCB ground plane. Thermal resistance θ_JA = 34°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7960BCPZ-RL7 and ADS8860IRGET, the LTC2385IUH-18#PBF uniquely combines 18-bit resolution, 5 Msps throughput, integrated reference, and LVDS interface in a single 5 mm × 5 mm QFN-making it optimal for noise-sensitive, high-density, real-time acquisition systems where deterministic latency and EMI resilience are critical.

Availability

LTC2385IUH-18#PBF is available at Aetrix Electronics and suitable for high-speed imaging, industrial instrumentation, communications receiver design, and automated test equipment requiring stable component supply across extended temperature ranges.

Supply support for LTC2385IUH-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 LTC2385IUH-18#PBF belongs to ADI's high-speed precision SAR ADC product line, engineered for applications demanding both wide dynamic range and deterministic timing-especially where pipeline ADC latency is unacceptable.

FAQ

What is the operating temperature range for the LTC2385IUH-18#PBF?

The LTC2385IUH-18#PBF is rated for industrial operation from –40°C to +85°C, as confirmed by its "I" grade marking and absolute maximum ratings table. This range is validated across all electrical specifications including SNR, INL, and reference stability-making LTC2385IUH-18#PBF suitable for factory-floor instrumentation and outdoor deployed systems without derating.

Does the LTC2385IUH-18#PBF require an external reference?

No, the LTC2385IUH-18#PBF includes a precision internal 2.048 V bandgap reference with ±20 ppm/°C max temperature coefficient and 0.25% initial accuracy. REFBUF provides a buffered 4.096 V output. An external reference may be applied to REFIN only if higher accuracy or different voltage is needed-otherwise, LTC2385IUH-18#PBF operates fully self-contained.

How does the LVDS interface of the LTC2385IUH-18#PBF reduce system noise?

The LTC2385IUH-18#PBF uses differential LVDS signaling (DA+/DA–, DB+/DB–, CLK+/CLK–) with 350 mV typical differential swing and 1.25 V common-mode voltage, providing >60 dB common-mode noise rejection. This allows reliable high-speed data transfer over longer traces or noisy environments-unlike single-ended interfaces-without degrading the 95.7 dB SNR performance of LTC2385IUH-18#PBF.

Can the LTC2385IUH-18#PBF operate with a single-ended CNV signal?

Yes-the LTC2385IUH-18#PBF supports single-ended conversion start: tie CNV– to GND and drive CNV+ with a 2.5 V CMOS signal. The datasheet specifies VIH = 1.7 V and VIL = 0.6 V for this mode. This simplifies timing interface in FPGA- or microcontroller-based systems lacking differential drivers, while preserving full 5 Msps performance and timing specs of LTC2385IUH-18#PBF.

What is the power consumption of the LTC2385IUH-18#PBF in power-down mode?

In power-down mode (PD = low), the LTC2385IUH-18#PBF draws only 10 µW total-comprising 1 µA from VDD and 2 µA from combined VDDL + OVDD supplies. This ultra-low standby power enables rapid wake-up (<1 µs) for burst-mode acquisition, extending battery life in portable instrumentation and reducing idle thermal load in always-on systems using LTC2385IUH-18#PBF.