Analog Devices Inc. LTC2325CUKG-14#PBF

Overview

LTC2325CUKG-14#PBF from Analog Devices (formerly Linear Technology) is a quad, 14-bit + sign successive approximation register (SAR) analog-to-digital converter with simultaneous sampling, differential inputs, and integrated 4.096V reference. It delivers 5Msps per channel, ±1LSB typical INL, 81dB SNR at 2.2MHz input, and operates from single 3.3V or 5V supply - ideal for high-speed data acquisition in multiphase motor control and optical networking.

For engineers reviewing the LTC2325CUKG-14#PBF datasheet, LTC2325CUKG-14#PBF pinout, LTC2325CUKG-14#PBF application, or LTC2325CUKG-14#PBF equivalent, key selection considerations include guaranteed 14-bit no-missing-codes performance, 52-lead QFN package with LVDS/CMOS dual-mode serial interface, simultaneous four-channel sampling with <500ps aperture matching, and operation across 0°C to 70°C industrial temperature range.

Technical Context

The LTC2325CUKG-14#PBF implements four independent SAR ADC cores sharing a common reference architecture with individually buffered REFOUT1–4 outputs. Its simultaneous sampling is achieved via four matched track-and-hold circuits triggered by a single CNV signal, ensuring sub-nanosecond inter-channel timing skew.

It supports flexible digital interfacing: CMOS mode (OVDD = 1.8V/2.5V), LVDS mode (OVDD = 2.5V), or low-power LVDS; and SDR/DDR serial data transfer via dedicated SDOx pins (or differential SDOA–D pairs) synchronized to CLKOUT, enabling FPGA or ASIC integration with deterministic latency (one-cycle conversion delay).

Key Specifications

Pinout & Package

Package: 52-lead (7mm × 8mm) plastic QFN with exposed thermal pad (Pin 53 = GND). RoHS-compliant, lead-free finish (#PBF).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad SAR ADC applications.

Compared with AD7606C-16 and ADS8684, the LTC2325CUKG-14#PBF uniquely delivers 5Msps simultaneous 14-bit sampling with LVDS output and per-channel reference buffering - making it optimal for FPGA-based real-time control where timing coherence and interface flexibility outweigh raw resolution.

Availability

LTC2325CUKG-14#PBF is available at Aetrix Electronics and suitable for multiphase motor control, optical network monitoring, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed 0°C to 70°C industrial temperature operation.

Supply support for LTC2325CUKG-14#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and DSP technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2325 series belongs to Analog Devices' high-speed precision SAR ADC product line, designed specifically for applications demanding simultaneous multi-channel sampling, low-latency deterministic timing, and integrated reference stability in space-constrained industrial systems.

FAQ

What is the operating temperature range for the LTC2325CUKG-14#PBF?

The LTC2325CUKG-14#PBF is specified for 0°C to 70°C ambient operation (C-grade). This is confirmed in the Order Information table, where "CUKG" denotes the commercial temperature grade. It is not rated for extended industrial (–40°C to 85°C) or high-reliability (–40°C to 125°C) ranges - those require LTC2325IUKG-14#PBF or LTC2325HUKG-14#PBF variants respectively.

Does the LTC2325CUKG-14#PBF support both CMOS and LVDS digital interfaces?

Yes, the LTC2325CUKG-14#PBF supports both interfaces via the CMOS/LVDS pin (Pin 25): grounding enables CMOS mode (1.8V/2.5V OVDD), tying to OVDD enables LVDS mode, and floating selects low-power LVDS. The device provides dedicated pins for both configurations - SDO1–4 for CMOS and SDOA–D± pairs for LVDS - with identical timing and functionality.

How many reference outputs does the LTC2325CUKG-14#PBF provide, and what are their functions?

The LTC2325CUKG-14#PBF provides four independent reference buffer outputs: REFOUT1 (Pin 22), REFOUT2 (Pin 9), REFOUT3 (Pin 6), and REFOUT4 (Pin 45). Each supplies a nominally 4.096V (or 2.048V) buffered reference to its corresponding ADC channel (AIN1–AIN4), allowing isolated decoupling and minimizing crosstalk between channels during simultaneous sampling.

What is the significance of the "+ sign" in the LTC2325CUKG-14#PBF's 14-bit + sign resolution?

The "+ sign" indicates the LTC2325CUKG-14#PBF outputs a 15-bit word comprising a 14-bit magnitude plus a sign bit - enabling true bipolar input ranges (e.g., ±4.096V differential). This format directly supports signed integer arithmetic in FPGAs or processors without post-processing, preserving dynamic range for AC-coupled or zero-centered sensor signals.

Can the LTC2325CUKG-14#PBF operate with an external reference, and how is it configured?

Yes, the LTC2325CUKG-14#PBF supports external references. To disable internal buffers, tie REFBUFEN (Pin 43) to GND. Then drive any or all REFOUT1–4 pins with an external source (1.25V–5V). The REF pin (Pin 8) may also be overdriven to establish a common reference for all four ADC cores, simplifying system-level reference distribution.