Analog Devices Inc. LTC2238IUH#PBF

Overview

LTC2238IUH#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 65Msps low-noise pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications and imaging systems. It operates from a single 3V supply (2.7V–3.4V), delivers 61.8dB SNR and 85dB SFDR at Nyquist, supports ±0.5V to ±1V differential input range, and features integrated clock duty cycle stabilization and shutdown/nap modes.

For engineers reviewing the LTC2238IUH#PBF datasheet, LTC2238IUH#PBF pinout, LTC2238IUH#PBF application, or LTC2238IUH#PBF equivalent, this page provides verified technical context, package-validated pin functions, real-world use cases in ultrasound and spectral analysis, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The LTC2238IUH#PBF implements a six-stage CMOS pipelined ADC architecture with internal sample-and-hold, correction logic, and flexible reference programming via SENSE and MODE pins. Its 575MHz full-power bandwidth enables accurate digitization of wideband RF and IF signals up to 140MHz.

It supports both offset binary and 2's complement output formats, configurable clock duty cycle stabilization, and dual-supply operation (VDD = 3V, OVDD = 0.5V–3.6V) to interface directly with 1.8V/2.5V/3.3V logic. Pipeline latency is fixed at 5 cycles, and aperture jitter is specified at 0.2psRMS.

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 10-bit, medium-speed ADC applications.

Compared with AD9215BRUZ-65, LTC2238IUH#PBF offers 1.6dB better SNR and 5dB higher SFDR at same speed but consumes 90mW more power; compared with LTC2228IUH#PBF, it trades 2 bits of resolution for 120mW lower power and reduced FPGA resource usage due to narrower bus width.

Availability

LTC2238IUH#PBF is available at Aetrix Electronics and suitable for ultrasound imaging systems, wireless infrastructure receivers, and portable spectral analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2238IUH#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2238IUH#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding digitization tasks in communications infrastructure, medical imaging, and test equipment where SNR, SFDR, and low power at speed are critical.

FAQ

What is the operating temperature range for the LTC2238IUH#PBF?

The LTC2238IUH#PBF is rated for industrial operation from –40°C to +85°C, as indicated by the "I" grade suffix in the part number. This specification is validated per the Absolute Maximum Ratings table and applies to all DC and AC performance parameters unless otherwise noted in the datasheet's temperature column markers.

Does the LTC2238IUH#PBF support differential clock input?

No, the LTC2238IUH#PBF accepts only a single-ended clock on Pin 9 (CLK). However, its integrated clock duty cycle stabilizer compensates for non-50% duty cycles, allowing robust operation with FPGA-generated clocks or crystal oscillators without external duty cycle correction circuits.

How is the input full-scale range configured on the LTC2238IUH#PBF?

The LTC2238IUH#PBF uses the SENSE pin (Pin 30) to configure input range: connecting SENSE to VCM selects ±0.5V, to VDD selects ±1V, and to an external voltage between 0.5V and 1V selects ±VSENSE. This eliminates external resistive dividers or programmable gain amplifiers in most signal chain designs.

What is the purpose of the OF (Over/Under Flow) pin on the LTC2238IUH#PBF?

The OF pin (Pin 28) asserts high when the analog input exceeds the selected full-scale range in either positive or negative direction. This flag enables real-time clipping detection in software-defined radio receivers or automatic gain control (AGC) loops without requiring post-processing analysis of the digital output stream.

Can the LTC2238IUH#PBF interface directly with a 1.8V FPGA I/O bank?

Yes, the LTC2238IUH#PBF supports OVDD from 0.5V to 3.6V. Setting OVDD = 1.8V configures D0–D9 and OF outputs for 1.8V CMOS logic levels, enabling direct connection to Xilinx Artix-7 or Intel Cyclone V FPGA banks without level translators - verified in the Digital Inputs and Outputs section of the datasheet.