Analog Devices Inc. LTC2173CUKG-14#TRPBF

Overview

LTC2173CUKG-14#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 80Msps quad-channel simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and instrumentation systems. It delivers 72.9dB SNR at 70MHz input, 88dB SFDR, ultralow 0.15psRMS jitter, ±1LSB INL (typ), and operates from a single 1.8V supply with serial LVDS outputs in 1- or 2-lane mode.

For engineers reviewing the LTC2173CUKG-14#TRPBF datasheet, LTC2173CUKG-14#TRPBF pinout, LTC2173CUKG-14#TRPBF application, or LTC2173CUKG-14#TRPBF equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for multichannel IF/RF sampling designs requiring low power and high AC performance.

Technical Context

The LTC2173CUKG-14#TRPBF implements four independent 14-bit ADC cores with shared sample-and-hold (800MHz full-power bandwidth) and integrated clock duty cycle stabilizer. Its serial LVDS interface supports configurable 1-bit or 2-bit per channel output serialization, selectable internal/external reference, and programmable input range (1–2VP-P).

It features dedicated differential analog inputs per channel (AIN1± to AIN4±), dual common-mode bias outputs (VCM12, VCM34), and flexible encode input support (differential or single-ended ENC+/ENC–). Power management includes Nap (85mW) and Shutdown (1mW) modes, with total dissipation of 376mW at 80Msps in 2-lane, 1.75mA LVDS mode.

Key Specifications

Pinout & Package

52-pin (7mm × 8mm) plastic QFN package with exposed 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, 14-bit ADC applications.

Compared with LTC2173CUKG-14#TRPBF, the LTC2174CUKG-14#TRPBF offers +25Msps headroom with identical footprint and interface, while the AD9257BCPZ-80 trades LVDS simplicity for JESD204B scalability at higher power and integration complexity.

Availability

LTC2173CUKG-14#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, software-defined radio, and multichannel test equipment requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production lots.

Supply support for LTC2173CUKG-14#TRPBF 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 aerospace, communications, industrial, and healthcare markets.

The LTC2173CUKG-14#TRPBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding communications and instrumentation applications requiring simultaneous multichannel sampling, low jitter, and low power in compact QFN packages.

FAQ

What is the maximum sampling rate supported by the LTC2173CUKG-14#TRPBF?

The LTC2173CUKG-14#TRPBF supports a maximum sampling rate of 80Msps, as specified in its speed grade designation. This rate is guaranteed across the full operating temperature range (0°C to 70°C) and applies to all four channels operating simultaneously with no performance degradation. At this rate, the device achieves 72.9dB SNR and 88dB SFDR at 70MHz input frequency, making it suitable for wideband IF sampling in communications systems.

Does the LTC2173CUKG-14#TRPBF support both internal and external voltage references?

Yes, the LTC2173CUKG-14#TRPBF supports both internal and external reference configurations via the SENSE pin. Connecting SENSE to VDD selects the internal reference with ±1V input range; grounding SENSE selects ±0.5V range; applying 0.625V–1.3V to SENSE sets an input range of ±0.8×VSENSE. The internal reference provides 1.25V ±25mV with ±25ppm/°C drift, and external reference mode maintains 1.2LSBRMS transition noise and ±1LSB INL.

How many differential LVDS data lanes does the LTC2173CUKG-14#TRPBF use in default configuration?

The LTC2173CUKG-14#TRPBF defaults to 2-lane LVDS mode, outputting two serialized bits per channel per clock edge - resulting in eight differential LVDS pairs (OUT1A±/OUT1B± through OUT4A±/OUT4B±). This mode supports 14-bit resolution with tSER = 1/(7•fS) at 80Msps. The 1-lane mode (one bit per channel) is enabled via PAR/SER = VDD and CS logic, reducing lane count to four differential pairs but doubling serialization latency.

What is the purpose of the VCM12 and VCM34 pins on the LTC2173CUKG-14#TRPBF?

VCM12 and VCM34 are dedicated common-mode bias outputs that each provide a nominally VDD/2 voltage (1.8V supply → ~0.9V) to set the common-mode level for two differential analog input pairs. VCM12 biases AIN1± and AIN2±; VCM34 biases AIN3± and AIN4±. Each must be bypassed to ground with a 0.1µF ceramic capacitor to maintain >80dB CMRR and prevent gain/offset errors caused by noise coupling into the analog input paths.

Can the LTC2173CUKG-14#TRPBF operate with a single-ended encode clock input?

Yes, the LTC2173CUKG-14#TRPBF supports single-ended encode clock operation by tying ENC– to GND and driving ENC+ with a 1.8V square wave or sine wave. In this mode, conversion triggers on the rising edge of ENC+, and the internal duty cycle stabilizer remains active to ensure optimal timing margin. Input specifications include VIH = 1.2V (min) and VIL = 0.6V (max) at VDD = 1.8V, with 3.5pF input capacitance and 30kΩ input resistance.