Analog Devices Inc. LTC2226HLX#PBF

Overview

LTC2226HLX#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 ±0.5V to ±1V differential input range with internal 1.5V VCM bias.

For engineers reviewing the LTC2226HLX#PBF datasheet, LTC2226HLX#PBF pinout, LTC2226HLX#PBF application, or LTC2226HLX#PBF equivalent, key selection considerations include its guaranteed no-missing-codes performance over temperature, 0.25LSB_RMS transition noise, clock duty cycle stabilizer option, shutdown/nap modes, and compatibility with transformer- or amplifier-based differential drive topologies.

Technical Context

The LTC2226HLX#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 4pF sampling capacitors switched by NMOS transistors controlled by the single-ended CLK input, with aperture delay jitter specified at 0.2ps_RMS.

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

Key Specifications

Pinout & Package

Package: 48-lead (7mm × 7mm) plastic LQFP, RoHS-compliant lead-free finish (LX package), θ_JA = 53°C/W, T_JMAX = 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, the LTC2226HLX#PBF provides guaranteed operation to 125°C and integrated features reducing BOM count, while LTC2246HLX#PBF offers two additional bits of resolution at higher power-enabling trade-offs between precision, thermal robustness, and system integration density.

Availability

LTC2226HLX#PBF is available at Aetrix Electronics and suitable for medical ultrasound imaging, wireless base station receivers, and industrial machine vision systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2226HLX#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 LTC2226HLX#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for applications demanding wide dynamic range, low power, and guaranteed performance across harsh environmental conditions including automotive under-hood and industrial control environments.

FAQ

What is the maximum input frequency supported by the LTC2226HLX#PBF before aliasing occurs?

The LTC2226HLX#PBF has a 575MHz full-power bandwidth, meaning it can accurately digitize analog inputs up to that frequency without significant amplitude roll-off. However, to avoid aliasing, the Nyquist criterion requires input frequencies below half the sampling rate-so for its 25Msps operation, signals above 12.5MHz will alias unless band-limited by an external anti-alias filter. The device's wide bandwidth supports reconstruction of harmonics well beyond the first Nyquist zone when used with undersampling techniques.

Does the LTC2226HLX#PBF require external reference components to operate?

No-the LTC2226HLX#PBF includes an internal 1.5V bandgap reference and configurable reference circuitry. When using the internal reference, only external bypass capacitors (0.1µF + 2.2µF ceramics on REFH/REFL and VCM) are required. An external reference may be applied via the SENSE pin if higher accuracy or custom voltage ranges are needed, but it is not mandatory for basic operation.

How does the clock duty cycle stabilizer in the LTC2226HLX#PBF improve system design flexibility?

The clock duty cycle stabilizer in the LTC2226HLX#PBF allows use of input clocks with duty cycles outside the strict 45–55% range required for optimal performance. By regenerating a precise 50% internal clock using a PLL locked to the input clock's rising edge, it eliminates setup/hold timing violations caused by asymmetric clocks-enabling simpler clock generation (e.g., from microcontrollers or low-cost oscillators) without sacrificing AC performance like SNR or SFDR.

Can the LTC2226HLX#PBF interface directly with a 1.8V FPGA I/O bank?

Yes-the LTC2226HLX#PBF supports independent digital output supply (OVDD) from 0.5V to 3.6V. Setting OVDD = 1.8V configures all 12 digital outputs (D0–D11) and OF flag to swing between 0V and 1.8V, matching standard 1.8V LVCMOS levels. No external level shifters are needed, simplifying PCB routing and reducing component count in FPGA-based data acquisition systems.

What thermal management considerations apply to the LTC2226HLX#PBF in continuous 125°C operation?

At 125°C ambient, the LTC2226HLX#PBF's 75mW typical power dissipation results in a junction temperature rise of ~40°C (θ_JA = 53°C/W), reaching ~165°C-exceeding its 150°C T_JMAX. To maintain reliability, ensure adequate copper pour (≥2 sq-in thermal pad), multiple vias to inner ground planes, and airflow or heatsinking. Derating to 60mW or lowering ambient temperature is recommended for sustained 125°C operation.