Analog Devices Inc. LTC2171CUKG-14#PBF

Overview

LTC2171CUKG-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 4-channel simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range communications signal digitization at 40Msps. It delivers 73.5dB SNR and 90dB SFDR at 70MHz input, features ultralow 0.15psRMS aperture jitter, and operates from a single 1.8V supply - enabling undersampling in software-defined radio and cellular base station receiver front-ends.

For engineers reviewing the LTC2171CUKG-14#PBF datasheet, LTC2171CUKG-14#PBF pinout, LTC2171CUKG-14#PBF application, or LTC2171CUKG-14#PBF equivalent, key selection criteria include its quad-channel synchronization capability, serial LVDS output configuration (1- or 2-lane), 800MHz full-power bandwidth, ±1LSB INL, and compatibility with differential clock inputs up to 3.6V.

Technical Context

The LTC2171CUKG-14#PBF implements four independent 14-bit ADC cores with shared sample-and-hold and internal clock duty cycle stabilizer, supporting true simultaneous sampling across all channels. Its architecture enables precise phase coherence critical for MIMO and beamforming applications.

Digital interface uses serialized LVDS outputs per channel (OUT1A+/– through OUT4B+/–), configurable for 1-bit or 2-bit serialization modes with programmable output current (1.75mA or 3.5mA) and on-chip 100Ω termination. Control is managed via SPI port (CS/SCK/SDI/SDO) or parallel mode using PAR/SER pin selection.

Key Specifications

Pinout & Package

Package: 52-lead (7mm × 8mm) plastic QFN (UKG) with exposed pad (Pin 53 = GND), rated for 0°C to 70°C operating temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9257BCPZ-40 and LTC2170CUKG-14#PBF, the LTC2171CUKG-14#PBF uniquely balances 40Msps performance, integrated reference flexibility, and ultra-low jitter in a compact QFN - making it optimal for analog-domain-synchronized, thermally sensitive RF receiver designs.

Availability

LTC2171CUKG-14#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio, portable medical imaging, and multichannel test equipment requiring stable component supply and long-term production continuity.

Supply support for LTC2171CUKG-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 aerospace, industrial, automotive, and communications markets.

The LTC217x family was designed specifically for high-dynamic-range, low-power, multichannel digitization in communications and instrumentation - emphasizing simultaneous sampling accuracy, jitter resilience, and flexible interface options for demanding RF front-ends.

FAQ

What is the maximum analog input frequency supported by the LTC2171CUKG-14#PBF?

The LTC2171CUKG-14#PBF features an 800MHz full-power bandwidth sample-and-hold stage, enabling accurate digitization of analog inputs up to 800MHz. Performance metrics such as SNR and SFDR are specified up to 140MHz, but the device maintains usable response beyond that - supporting undersampling architectures for IF/RF signals in communications applications.

Does the LTC2171CUKG-14#PBF support both internal and external voltage references?

Yes, the LTC2171CUKG-14#PBF supports both internal and external references via the SENSE pin. Tying SENSE to VDD selects the internal reference with ±1V input range; grounding it selects ±0.5V; applying 0.625V–1.3V externally sets ±0.8×VSENSE. This eliminates need for external reference ICs in most configurations while maintaining ±25ppm/°C drift stability.

How does the serial LVDS output mode affect data timing in the LTC2171CUKG-14#PBF?

The LTC2171CUKG-14#PBF supports 1-lane (1-bit) and 2-lane (2-bit) LVDS serialization. In 2-lane mode at 40Msps, tSER = 1/(7 × fS) ≈ 3.57ns; in 1-lane mode, tSER = 1/(14 × fS) ≈ 1.79ns. Frame (FR) and data clock (DCO) timing align to tSER, with propagation delay ranging from 0.7n + 2×tSER to 1.5n + 2×tSER - critical for FPGA capture window setup.

Can the LTC2171CUKG-14#PBF operate with a single-ended encode clock?

Yes, the LTC2171CUKG-14#PBF supports single-ended encode clocks by tying ENC– to GND and driving ENC+ with TTL, CMOS, or square-wave signals (0–3.6V). Input thresholds are VIH = 1.2V and VIL = 0.6V at VDD = 1.8V. However, differential mode provides superior noise immunity and jitter performance - especially important in high-SFDR applications.

What is the pipeline latency of the LTC2171CUKG-14#PBF and why does it matter?

The LTC2171CUKG-14#PBF has a fixed pipeline latency of 6 clock cycles from sample initiation to first valid output word. This deterministic delay is essential for time-critical closed-loop systems (e.g., digital predistortion in transmitters) and enables precise alignment with FPGA-based DSP pipelines without variable FIFO buffering.