Analog Devices Inc. LTC2161IUK#TRPBF

Overview

LTC2161IUK#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 40Msps low-power analog-to-digital converter optimized for high-dynamic-range signal digitization in communications infrastructure. It delivers 77dB SNR, 90dB SFDR, and ultralow 0.07psRMS jitter, enabling high-fidelity undersampling of IF signals up to 140MHz. Its single 1.8V supply, 550MHz full-power bandwidth sample-and-hold, and support for CMOS/DDR-CMOS/DDR-LVDS outputs make it suitable for cellular base station receiver chains.

For engineers reviewing the LTC2161IUK#TRPBF datasheet, LTC2161IUK#TRPBF pinout, LTC2161IUK#TRPBF application, or LTC2161IUK#TRPBF equivalent, key selection considerations include its guaranteed ±2LSB INL over –40°C to +85°C, selectable 1VP-P to 2VP-P input range, optional clock duty cycle stabilizer, serial SPI configuration interface, and 48-lead 7mm × 7mm QFN package with exposed thermal pad.

Technical Context

The LTC2161IUK#TRPBF implements a pipeline ADC architecture with integrated sample-and-hold, reference buffer, and configurable digital output drivers. Its analog front-end supports differential or single-ended encode inputs (PECL/LVDS/TTL/CMOS), while the internal 1.25V reference can be overridden via the SENSE pin for external reference operation.

Digital interface flexibility includes full-rate CMOS, double-data-rate CMOS, or DDR-LVDS output modes, each with independent OVDD supply (1.1V–1.8V). Power management features include Nap mode (10mW) and Sleep mode (1mW), alongside a serial SPI port for real-time configuration of output format, randomizer, and clock stabilizer settings.

Key Specifications

Pinout & Package

48-lead (7mm × 7mm) plastic QFN package with exposed thermal pad (Pin 49 = GND), rated for –40°C to +85°C operation. 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 high-speed ADC applications.

Compared with AD9268BCPZ-105 and ADS52J90IRGCT, the LTC2161IUK#TRPBF offers the lowest power (63mW) and simplest parallel CMOS/DDR interface for cost-sensitive, thermally constrained 40Msps applications-without requiring JESD204B infrastructure or dual-supply sequencing.

Availability

LTC2161IUK#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, software-defined radio, and multichannel data acquisition requiring stable component supply across extended temperature ranges.

Supply support for LTC2161IUK#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 industrial, automotive, communications, and healthcare markets.

The LTC2161IUK#TRPBF belongs to ADI's high-speed precision ADC product line, engineered specifically for demanding communications and instrumentation applications where dynamic range, low jitter, and low power coexist in compact 7mm × 7mm QFN packages.

FAQ

What is the maximum analog input frequency supported by the LTC2161IUK#TRPBF?

The LTC2161IUK#TRPBF features a 550MHz full-power bandwidth sample-and-hold amplifier, enabling reliable digitization of analog inputs up to 550MHz. At 70MHz input frequency, it maintains 77dB SNR and 90dB SFDR; performance remains usable up to 140MHz for undersampling applications, as verified in the datasheet's FFT plots.

Does the LTC2161IUK#TRPBF require an external reference voltage?

No-the LTC2161IUK#TRPBF includes an internal 1.25V reference with ±25ppm/°C drift. However, it supports external reference operation via the SENSE pin (0.625V–1.3V range), allowing users to substitute high-precision references for metrology-grade applications. The internal reference remains active unless SENSE is driven externally.

Can the LTC2161IUK#TRPBF operate with a single 1.8V supply?

Yes-the LTC2161IUK#TRPBF operates from a single 1.8V analog supply (VDD = 1.7V to 1.9V) and supports independent digital output supply (OVDD = 1.1V to 1.8V). This dual-supply flexibility allows interfacing with 1.2V, 1.5V, or 1.8V logic families without level shifters, while minimizing total system power.

How does the clock duty cycle stabilizer function in the LTC2161IUK#TRPBF?

The clock duty cycle stabilizer in the LTC2161IUK#TRPBF corrects asymmetric encode clock waveforms internally, ensuring optimal aperture timing regardless of input duty cycle. Enabled via SPI register or parallel pin CS, it maintains full 40Msps performance even with 30%–70% duty cycle clocks-critical when using non-50% clocks from PLLs or dividers.

What are the power consumption modes available on the LTC2161IUK#TRPBF?

The LTC2161IUK#TRPBF offers three operational power states: active (63mW typical at 40Msps), Nap mode (10mW), and Sleep mode (1mW). Nap mode retains register settings and reference bias while disabling the ADC core; Sleep mode powers down all circuitry except wake-up logic. Both are controlled via SPI or parallel pins.