Analog Devices Inc. LTC2174IUKG-12#PBF

Overview

LTC2174IUKG-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 105 Msps quad-channel simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range RF/IF digitization. It delivers 70.6 dB SNR, 88 dB SFDR, and ultralow 0.15 ps_RMS aperture jitter at full speed, enabling undersampling of 70–140 MHz IF signals in cellular base stations and software-defined radios.

For engineers reviewing the LTC2174IUKG-12#PBF datasheet, LTC2174IUKG-12#PBF pinout, LTC2174IUKG-12#PBF application, or LTC2174IUKG-12#PBF equivalent, key selection criteria include guaranteed ±0.3 LSB INL over –40°C to +85°C, serial LVDS 1-/2-lane output flexibility, 1.8 V single-supply operation, and 800 MHz full-power bandwidth with differential input support.

Technical Context

The LTC2174IUKG-12#PBF implements four independent 12-bit ADC cores with shared clocking and synchronization logic, enabling true simultaneous sampling across all channels. Its internal duty cycle stabilizer maintains performance across wide input clock duty cycles (2%–98%), and its sample-and-hold supports full-power bandwidth up to 800 MHz.

Digital interface uses serial LVDS outputs with programmable 1-bit-per-channel (1-lane) or 2-bit-per-channel (2-lane) serialization, selectable via CS/SCK pins. Internal reference provides 1.25 V ±25 ppm/°C drift, while external reference mode accepts 0.625–1.300 V on SENSE pin with ±0.2% gain matching between channels.

Key Specifications

Pinout & Package

52-pin (7 mm × 8 mm) plastic QFN package with exposed thermal pad (Pin 53 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel, 12-bit ADC applications.

Compared with LTC2174IUKG-12#PBF, AD9257BSTZ-105 trades simplicity and integrated reference for higher resolution and serial interface scalability, while LTC2173IUKG-12#PBF offers identical form factor and reliability at reduced speed and power-enabling drop-in rate scaling without layout change.

Availability

LTC2174IUKG-12#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, defense communications, portable medical imaging, and industrial multichannel data acquisition requiring stable component supply across extended temperature ranges.

Supply support for LTC2174IUKG-12#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 acquired Linear Technology in 2017 and continues its legacy of high-performance signal chain components for demanding analog-intensive applications.

The LTC2174IUKG-12#PBF belongs to the LTC217x family of quad, simultaneous-sampling ADCs designed specifically for wideband communications and instrumentation where channel coherence, low jitter, and low power are non-negotiable.

FAQ

What is the maximum sampling rate supported by the LTC2174IUKG-12#PBF?

The LTC2174IUKG-12#PBF supports a maximum sampling rate of 105 Msps. This is its designated speed grade within the LTC217x family-distinct from the 125 Msps LTC2175-12 and 80 Msps LTC2173-12. Operation above 105 Msps is not characterized or guaranteed, and timing violations may occur in LVDS serialization or pipeline latency.

Does the LTC2174IUKG-12#PBF require an external reference voltage?

No, the LTC2174IUKG-12#PBF includes a precision internal reference (1.250 V ±25 ppm/°C) that can be used directly. However, it also supports external reference mode via the SENSE pin (0.625–1.300 V), which improves gain matching to ±0.2%FS across all four channels-critical for multichannel amplitude calibration.

How does the serial LVDS interface of the LTC2174IUKG-12#PBF operate in 1-lane vs 2-lane mode?

In 2-lane mode, each channel outputs two bits per sample (e.g., D1/D0) on dedicated LVDS pairs (OUTxA+/–, OUTxB+/–), doubling data throughput. In 1-lane mode, only OUTxA+/– is active per channel, carrying one bit per sample-halving interface pin count and power (IOVDD drops ~20 mA) at the cost of doubled serialization clock frequency.

What is the operating temperature range of the LTC2174IUKG-12#PBF?

The LTC2174IUKG-12#PBF is rated for industrial operation from –40°C to +85°C. This is confirmed by its "I" grade suffix and the Absolute Maximum Ratings table, which specifies the same range for all LTC2174I variants. Performance parameters like INL (±0.3 LSB), SNR (70.6 dB), and SFDR (88 dB) are guaranteed across this full range.

Can the LTC2174IUKG-12#PBF be used with single-ended clock inputs?

Yes-the ENC– pin can be tied to GND to enable single-ended encode mode. In this configuration, ENC+ accepts TTL, CMOS, or LVDS logic levels (0.6–3.6 V), with VIH ≥1.2 V and VIL ≤0.6 V at VDD = 1.8 V. The internal duty cycle stabilizer remains active, preserving timing performance even with asymmetric input waveforms.