Analog Devices Inc. LTC2174IUKG-14#PBF

Overview

LTC2174IUKG-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 105 Msps quad-channel simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range signal digitization in communications infrastructure. It delivers 72.6 dB SNR at 70 MHz input, 88 dB SFDR, and ultralow 0.15 ps_RMS aperture jitter, enabling undersampling of IF signals in cellular base stations and software-defined radios.

For engineers reviewing the LTC2174IUKG-14#PBF datasheet, LTC2174IUKG-14#PBF pinout, LTC2174IUKG-14#PBF application, or LTC2174IUKG-14#PBF equivalent, key selection criteria include its –40°C to +85°C industrial temperature grade, serial LVDS 2-lane/1-lane output flexibility, 1.8 V single-supply operation, and 52-pin 7 mm × 8 mm QFN package with exposed thermal pad.

Technical Context

The LTC2174IUKG-14#PBF implements four independent 14-bit ADC cores with shared sample-and-hold and internal clock duty cycle stabilizer, supporting differential or single-ended encode inputs (PECL/LVDS/TTL/CMOS). Its architecture enables true simultaneous sampling across all channels with 6-cycle pipeline latency and 800 MHz full-power bandwidth.

Digital interface uses programmable serial LVDS outputs-configurable for 1-bit or 2-bit per channel serialization-with optional on-chip 100 Ω termination and adjustable output current (1.75 mA or 3.5 mA). Configuration is managed via SPI port or parallel logic pins (PAR/SER mode), supporting shutdown and nap modes for power management.

Key Specifications

Pinout & Package

Package: 52-lead plastic QFN (7 mm × 8 mm), exposed pad (Pin 53) soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel, 14-bit ADC applications.

Compared with AD9257BRUZ-105, LTC2174IUKG-14#PBF offers simpler LVDS interfacing and integrated reference but lacks JESD204B scalability; compared with LTC2173IUKG-14#PBF, it delivers 25 Msps higher throughput at +74 mW power penalty - optimal for mid-tier 5G small cells and portable spectrum analyzers.

Availability

LTC2174IUKG-14#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging requiring stable component supply across extended temperature ranges.

Supply support for LTC2174IUKG-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving communications, industrial, automotive, and healthcare markets.

The LTC2174IUKG-14#PBF belongs to ADI's high-speed data acquisition product line, engineered for demanding RF/IF digitization where simultaneous sampling, low jitter, and low power are critical in space- and thermal-constrained systems.

FAQ

What is the maximum sampling frequency supported by the LTC2174IUKG-14#PBF?

The LTC2174IUKG-14#PBF is rated for a maximum sampling frequency of 105 Msps. This speed is guaranteed across the full industrial temperature range (–40°C to +85°C) and applies to all four channels operating simultaneously with specified AC performance including 72.6 dB SNR and 88 dB SFDR at 70 MHz input. Exceeding 105 Msps may degrade linearity and noise performance.

Does the LTC2174IUKG-14#PBF require an external reference voltage?

No, the LTC2174IUKG-14#PBF includes an internal reference and supports three input range configurations via the SENSE pin: ±0.5 V (SENSE = GND), ±1 V (SENSE = VDD), or ±0.8×V_SENSE (external 0.625–1.3 V applied to SENSE). External references are optional and used only when higher precision or custom range is required.

How does the LVDS serialization mode affect the pin count and interface design for the LTC2174IUKG-14#PBF?

The LTC2174IUKG-14#PBF supports two LVDS serialization modes: 2-lane (2 bits per channel, 8 differential pairs) and 1-lane (1 bit per channel, 4 differential pairs). The 1-lane mode halves the number of LVDS traces required, easing PCB routing and reducing FPGA I/O usage, while maintaining full 14-bit resolution through time-multiplexing - critical for compact designs like portable SDRs.

What is the purpose of the VCM12 and VCM34 pins on the LTC2174IUKG-14#PBF?

VCM12 and VCM34 are dedicated common-mode bias outputs that provide a nominally VDD/2 (~0.9 V) voltage to bias the differential analog inputs of channels 1–2 and 3–4, respectively. Each must be bypassed to ground with a 0.1 µF ceramic capacitor to ensure stable common-mode voltage and minimize noise coupling into the sensitive analog front-end of the LTC2174IUKG-14#PBF.

Can the LTC2174IUKG-14#PBF operate with a single-ended encode clock input?

Yes, the LTC2174IUKG-14#PBF supports single-ended encode clock operation: tie ENC– to GND and drive ENC+ with TTL, CMOS, or 1.8 V square wave. In this mode, the minimum ENC+ high/low time is 2 ns (duty cycle stabilizer enabled), and the part maintains full 105 Msps performance and specified jitter. Differential mode remains preferred for best noise immunity.