Analog Devices Inc. LTC2247IUH#PBF

Overview

LTC2247IUH#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 40Msps low-power analog-to-digital converter optimized for high-dynamic-range signal digitization in demanding communications and imaging systems. It operates from a single 3V supply (2.7V–3.4V), delivers 74.4dB SNR and 90dB SFDR at 5MHz input, supports flexible ±0.5V to ±1V differential input range, and features integrated clock duty cycle stabilizer and shutdown/nap modes.

For engineers reviewing the LTC2247IUH#PBF datasheet, LTC2247IUH#PBF pinout, LTC2247IUH#PBF application, or LTC2247IUH#PBF equivalent, this page provides verified specifications, package-validated pin functions, real-world use cases in ultrasound and spectral analysis, and two confirmed alternative parts with documented technical and application differences.

Technical Context

The LTC2247IUH#PBF implements a six-stage CMOS pipelined ADC architecture with digital correction logic, achieving 5-cycle pipeline latency and no missing codes across temperature. Its sample-and-hold front-end offers 575MHz full-power bandwidth and aperture jitter of 0.2psRMS, enabling accurate digitization of wideband RF and IF signals up to Nyquist.

It integrates a programmable internal reference (1.5V VCM output), flexible input common-mode biasing (1.0V–1.9V), and dual-supply operation: 3V analog core (VDD) and independent 0.5V–3.6V digital output driver supply (OVDD). MODE and SENSE pins configure output format (offset binary/2's complement) and input range scaling without external components.

Key Specifications

Pinout & Package

Package: 32-lead (5mm × 5mm) plastic QFN (UH package); exposed pad (Pin 33) must be soldered to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with ADS5272IPFP and AD9245BSTZ-40, the LTC2247IUH#PBF delivers superior SFDR (90dB vs ≤87dB), lower active power (120mW vs ≥105mW), and integrated features (VCM, DCS, nap mode) that reduce bill-of-materials count and PCB area in portable and multi-channel systems.

Availability

LTC2247IUH#PBF is available at Aetrix Electronics and suitable for ultrasound imaging, spectral analysis, and portable instrumentation requiring stable component supply, long-term lifecycle support, and industrial-grade temperature performance.

Supply support for LTC2247IUH#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 industrial, automotive, communications, and healthcare markets.

The LTC2247IUH#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for applications demanding wide input bandwidth, low power, and robust DC/AC performance in compact form factors.

FAQ

What is the maximum input frequency supported by the LTC2247IUH#PBF before SNR degrades significantly?

The LTC2247IUH#PBF maintains 74.4dB SNR at 5MHz input and sustains ≥72.9dB SNR up to 20MHz input (–1dBFS, 2V range). At 70MHz input, SNR drops to 73.9dB, confirming its 575MHz full-power bandwidth preserves fidelity well beyond Nyquist (20MHz), making it suitable for undersampled IF digitization in communications receivers.

Does the LTC2247IUH#PBF require an external reference voltage, or can it operate with internal biasing?

The LTC2247IUH#PBF operates fully with its internal reference: the VCM pin provides a stable 1.5V common-mode output, and SENSE pin selection (e.g., tied to VCM) configures ±0.5V input range. No external reference is required for standard operation-only needed if higher absolute accuracy or custom full-scale range is mandated.

How does the clock duty cycle stabilizer in the LTC2247IUH#PBF improve system design?

The clock duty cycle stabilizer in the LTC2247IUH#PBF allows high AC performance (74.4dB SNR, 90dB SFDR) even with clock duty cycles from 40% to 60%, eliminating the need for external duty cycle correction circuits. This simplifies clock tree design when using PLLs or crystal oscillators with inherent duty cycle variation, reducing component count and board area.

What are the power states available on the LTC2247IUH#PBF, and how much power does each consume?

The LTC2247IUH#PBF supports three power states: active (120mW at 40Msps), nap mode (SHDN=H, OE=L → 15mW), and shutdown (SHDN=H, OE=H → 2mW). All states retain configuration registers, enabling fast wake-up-critical for battery-powered portable instrumentation and intermittent-sampling applications.

Can the LTC2247IUH#PBF interface directly with a 1.8V FPGA I/O bank without level shifters?

Yes-the LTC2247IUH#PBF supports OVDD from 0.5V to 3.6V. Setting OVDD = 1.8V configures all D0–D13 outputs and OF pin for 1.8V CMOS logic levels, enabling direct connection to Xilinx Artix-7 or Intel Cyclone V FPGA banks without external level translation, reducing signal integrity risk and BOM cost.