Analog Devices Inc. LTC2170CUKG-14#PBF

Overview

LTC2170CUKG-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, quad-channel, simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range signal digitization at 25Msps. It delivers 73.5dB SNR and 90dB SFDR at 70MHz input, features ultralow 0.15psRMS jitter, operates from a single 1.8V supply, and uses serial LVDS outputs in 1- or 2-lane mode - ideal for portable medical imaging and multichannel data acquisition systems.

For engineers reviewing the LTC2170CUKG-14#PBF datasheet, LTC2170CUKG-14#PBF pinout, LTC2170CUKG-14#PBF application, or LTC2170CUKG-14#PBF equivalent, this page provides verified specifications, validated pin functions, confirmed package mapping to the 52-pin 7mm × 8mm QFN, real-world timing behavior under 25Msps operation, and two rigorously cross-referenced alternative parts with documented functional and application-level differences.

Technical Context

The LTC2170CUKG-14#PBF implements four independent 14-bit ADC cores with shared sample-and-hold and internal clock duty cycle stabilizer, enabling full-performance operation across wide input clock duty cycles. Its 800MHz full-power bandwidth supports undersampling of IF signals up to 140MHz while maintaining 73.5dB SNR at 25Msps sampling rate.

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

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2171CUKG-14#PBF and AD9257BCPZ-25, the LTC2170CUKG-14#PBF offers the lowest power at 25Msps with superior jitter performance and LVDS interface simplicity, making it optimal for cost-sensitive, thermally constrained portable instrumentation where 25Msps is sufficient.

Availability

LTC2170CUKG-14#PBF is available at Aetrix Electronics and suitable for portable medical imaging, multichannel data acquisition, and nondestructive testing requiring stable component supply, long-term lifecycle assurance, and guaranteed lead-free compliance.

Supply support for LTC2170CUKG-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.

The LTC2170CUKG-14#PBF belongs to the LTC217x family of low-power, high-SFDR quad ADCs designed specifically for demanding communications and instrumentation applications where simultaneous sampling, wide input bandwidth, and ultralow jitter are critical.

FAQ

What is the maximum sampling rate supported by the LTC2170CUKG-14#PBF?

The LTC2170CUKG-14#PBF is rated for a maximum sampling frequency of 25Msps, as specified in its speed grade designation and confirmed in the Timing Characteristics table (Page 6). This is distinct from the LTC2171-14 (40Msps) and LTC2172-14 (65Msps) variants in the same family. Operation above 25Msps is not guaranteed and may degrade SNR, SFDR, or cause timing violations.

Does the LTC2170CUKG-14#PBF require an external reference voltage?

No, the LTC2170CUKG-14#PBF includes an internal reference and does not require an external reference. The SENSE pin (Pin 50) configures the input range: tied to GND for ±0.5V, to VDD for ±1V, or biased with 0.625V–1.3V for ±0.8×VSENSE. VREF (Pin 48) outputs a nominally 1.25V reference usable for external circuitry, but the ADC core operates autonomously using its internal reference.

What LVDS serialization modes does the LTC2170CUKG-14#PBF support?

The LTC2170CUKG-14#PBF supports both 1-lane and 2-lane LVDS serialization per channel. In 2-lane mode, each channel outputs two bits per clock edge (e.g., D0/D1); in 1-lane mode, it outputs one bit per edge. Serialization depth is configurable for 12-, 14-, or 16-bit words, and output current is selectable between 1.75mA and 3.5mA via SCK (Pin 20) in parallel programming mode.

How is the LTC2170CUKG-14#PBF's analog input common-mode voltage generated?

The LTC2170CUKG-14#PBF generates analog input common-mode voltage internally via two dedicated outputs: VCM12 (Pin 3) for channels 1 and 2, and VCM34 (Pin 12) for channels 3 and 4. Each outputs nominally VDD/2 (0.9V at 1.8V supply) with ±25mV tolerance and ±25ppm/°C drift. These pins must be bypassed to ground with 0.1µF ceramic capacitors and used to bias the differential analog inputs (e.g., AIN1+, AIN1–).

What power-saving modes are available on the LTC2170CUKG-14#PBF?

The LTC2170CUKG-14#PBF offers three power states: active (162mW at 25Msps), sleep mode (75mW), and nap mode (1mW). Sleep mode retains register settings and reference bias; nap mode powers down most circuitry except wake-up logic. Entry into these modes is controlled via SPI register writes or parallel logic inputs (CS/SDI), with fast wake-up times (<1µs from sleep, <10µs from nap).