Analog Devices Inc. LTC2228IUH#PBF

Overview

LTC2228IUH#PBF from Analog Devices (acquired Linear Technology) is a 12-bit, 65Msps low-power 3V analog-to-digital converter optimized for high-dynamic-range signal digitization in demanding RF and imaging systems. It delivers 71.3dB SNR and 90dB SFDR at Nyquist, features ±0.3LSB INL (typ), 575MHz full-power bandwidth, and operates from a single 2.7V–3.4V supply with separate 0.5V–3.6V output driver supply.

For engineers reviewing the LTC2228IUH#PBF datasheet, LTC2228IUH#PBF pinout, LTC2228IUH#PBF application, or LTC2228IUH#PBF equivalent, key selection criteria include its 65Msps sampling rate, industrial temperature range (–40°C to +85°C), QFN-32 package, clock duty cycle stabilizer, and support for differential or single-ended analog inputs with programmable ±0.5V/±1V ranges.

Technical Context

The LTC2228IUH#PBF implements a six-stage CMOS pipelined ADC architecture with digital correction logic to achieve high linearity and low noise. Its sample-and-hold circuit has 0.25LSB_RMS transition noise and 0.2ps_RMS aperture jitter, enabling accurate digitization of wideband signals up to 140MHz input frequency.

It integrates flexible reference control via SENSE and MODE pins, supporting internal reference selection (±0.5V or ±1V input range), external reference operation, offset binary or 2's complement output format, and optional clock duty cycle stabilization - all configurable without external components.

Key Specifications

Pinout & Package

Package: 32-lead (5mm × 5mm) plastic QFN with exposed pad (Pin 33 = GND). Requires soldering of exposed pad to PCB ground plane 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 AD9226ASTZ and ADS5272IPFP, the LTC2228IUH#PBF offers lower power (205mW), integrated reference and input range control, industrial temperature rating, and pin-compatible scalability within the LTC222x family - making it optimal for cost-sensitive, thermally constrained, and field-deployable instrumentation.

Availability

LTC2228IUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical imaging, portable test equipment, and industrial data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2228IUH#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 LTC2228IUH#PBF belongs to ADI's high-speed precision ADC product line, engineered for applications demanding wide bandwidth, low noise, and robust operation in harsh environments - including base station radios, ultrasound systems, and portable spectrum analyzers.

FAQ

What is the operating temperature range specified for the LTC2228IUH#PBF?

The LTC2228IUH#PBF is rated for industrial operation from –40°C to +85°C, as confirmed by its "I" grade designation in the order information table and absolute maximum ratings section. This range is validated across all AC and DC specifications including SNR, SFDR, INL, and power consumption - making it suitable for outdoor telecom equipment and factory-floor instrumentation where ambient temperatures exceed commercial limits.

Does the LTC2228IUH#PBF require an external reference voltage?

No, the LTC2228IUH#PBF includes an internal 1.5V reference buffer (VCM pin) and supports fully self-contained operation using its internal reference. When SENSE is tied to VCM, it configures a ±0.5V differential input range; tying SENSE to VDD selects ±1V. An external reference between 0.5V and 1V applied to SENSE also works, but external reference is optional - not required - for standard operation.

How does the MODE pin affect output formatting and clock functionality in the LTC2228IUH#PBF?

The MODE pin on the LTC2228IUH#PBF simultaneously selects both output data format and clock duty cycle stabilizer (DCS) state: grounding MODE enables offset binary output and disables DCS; applying 1/3 VDD enables offset binary with DCS active; 2/3 VDD selects 2's complement with DCS active; and tying to VDD selects 2's complement with DCS disabled. This dual-function pin eliminates need for separate control lines in space-constrained layouts.

What is the significance of the OF (Over/Under Flow) pin on the LTC2228IUH#PBF?

The OF pin on the LTC2228IUH#PBF is an active-high, asynchronous flag that pulses high whenever the analog input exceeds the selected full-scale range - indicating either overrange (positive saturation) or underrange (negative saturation). It is used in real-time AGC loops to dynamically adjust front-end gain, preventing clipping-induced distortion in receiver signal chains without requiring post-processing analysis.

Can the LTC2228IUH#PBF interface directly with 1.8V FPGA I/O banks?

Yes, the LTC2228IUH#PBF supports direct interfacing with 1.8V FPGA I/O banks via its independently powered OVDD supply pin (Pin 21). When OVDD = 1.8V, the D0–D11 outputs meet 1.8V LVCMOS logic thresholds (VOH ≥ 1.79V, VOL ≤ 0.09V at 1.6mA sink), eliminating level-shifter components and simplifying high-speed parallel bus routing to Xilinx or Intel FPGAs.