Analog Devices Inc. LTC2226HLU#PBF

Overview

LTC2226HLU#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 25Msps low-power pipelined analog-to-digital converter optimized for high-frequency signal digitization in demanding imaging and communications systems. It operates from a single 3V supply (2.8V–3.5V), delivers 71.4dB SNR and 90dB SFDR at 5MHz input, supports –40°C to 125°C operation, and features flexible 1VP-P to 2VP-P differential input range with 575MHz full-power bandwidth.

For engineers reviewing the LTC2226HLU#PBF datasheet, LTC2226HLU#PBF pinout, LTC2226HLU#PBF application, or LTC2226HLU#PBF equivalent, key selection criteria include its guaranteed no-missing-codes performance over temperature, low 0.25LSB_RMS transition noise, clock duty cycle stabilizer capability, shutdown/nap modes, and compatibility with automotive and industrial harsh-environment designs.

Technical Context

The LTC2226HLU#PBF implements a six-stage CMOS pipelined ADC architecture with 5-cycle pipeline latency, where each stage includes quantization, residue generation, and amplification. Its sample-and-hold uses differential NMOS-switched 4pF sampling capacitors, with aperture delay jitter specified at 0.2ps_RMS.

Reference configuration is programmable via the SENSE pin: tied to VDD for ±1V (2VP-P) input range, to VCM for ±0.5V (1VP-P), or to external voltage (0.5V–1V) for proportional scaling. Output format (offset binary or 2's complement) and clock duty cycle stabilizer enable/disable are controlled jointly by the MODE pin voltage level.

Key Specifications

Pinout & Package

48-pin (7mm × 7mm) LQFP package with exposed pad; thermal resistance θ_JA = 53°C/W; TJ_MAX = 150°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9226BSTZ-25 and LTC2246HLU#PBF, the LTC2226HLU#PBF offers superior SFDR for multi-tone communication signals, guaranteed automotive temperature operation without derating, and integrated clock duty cycle stabilization-enabling robust performance with low-jitter clock sources in compact industrial and medical platforms.

Availability

LTC2226HLU#PBF is available at Aetrix Electronics and suitable for medical ultrasound imaging, wireless base station receivers, and industrial motor drive current sensing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2226HLU#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 LTC2226H belongs to ADI's high-speed precision ADC product line, designed specifically for applications demanding wide dynamic range, low power, and guaranteed performance across extreme temperatures-such as aerospace telemetry, downhole oilfield sensors, and military radar subsystems.

FAQ

What is the maximum input frequency supported by the LTC2226HLU#PBF while maintaining full-scale accuracy?

The LTC2226HLU#PBF has a 575MHz full-power bandwidth, meaning it maintains ≤3dB amplitude response up to that frequency for a full-scale input. However, AC performance metrics like SNR and SFDR degrade with increasing input frequency; at 70MHz input, SNR drops to 71.2dB and SFDR to 85dB. For optimal accuracy in precision applications, inputs below 30MHz are recommended, where SFDR remains ≥90dB and SNR stays ≥71.4dB.

Does the LTC2226HLU#PBF require external reference components, or is the reference fully integrated?

The LTC2226HLU#PBF integrates a 1.5V bandgap reference and internal difference amplifier, eliminating need for external reference ICs. However, external passive components are mandatory: REFH/REFL pins require 0.1µF + 2.2µF ceramic bypass capacitors to GND, and VCM pins require ≥2.2µF bypassing. The SENSE pin configures reference range but must be tied directly to VDD, VCM, or an external voltage-no active driver is permitted.

Can the LTC2226HLU#PBF operate with a single-ended analog input, and what is the impact on performance?

Yes, the LTC2226HLU#PBF supports single-ended input: drive AIN+ with the signal and tie AIN– to VCM (1.5V). This degrades INL and harmonic distortion (SFDR drops ~3–5dB), but preserves SNR and DNL. For applications where SNR is critical but SFDR margin exists-such as basic data logging or low-order modulation schemes-single-ended drive reduces BOM cost and layout complexity without compromising core resolution.

How does the clock duty cycle stabilizer in the LTC2226HLU#PBF improve system design flexibility?

The clock duty cycle stabilizer in the LTC2226HLU#PBF allows use of non-50% duty cycle clocks (e.g., from microcontrollers or low-cost oscillators) while maintaining full 25Msps performance. It locks an internal PLL to the CLK rising edge, generating a precise 50% internal clock. This eliminates need for external clock conditioners, reduces jitter-induced SNR degradation, and simplifies timing budget allocation-especially valuable in cost-sensitive or space-constrained industrial controllers.

What are the power states supported by the LTC2226HLU#PBF, and how do they affect system-level energy efficiency?

The LTC2226HLU#PBF supports four power states via SHDN and OE pins: normal (75mW), high-Z outputs (75mW), nap mode (15mW), and shutdown (2mW). Nap mode retains internal bias and reference while disabling conversion, enabling sub-20µs wake-up; shutdown cuts all analog and digital supplies. These states allow dynamic power scaling in battery-powered test equipment or intermittent-sampling IoT gateways, extending operational life without sacrificing startup latency.