Analog Devices Inc. DC1350A-B

Overview

LTC2226H from Analog Devices (acquired Linear Technology) is a 12-bit, 25Msps low-power pipelined ADC optimized for high-dynamic-range signal digitization in demanding imaging and broadband 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 analog input range (±0.5V to ±1V differential) with internal 1.5V VCM bias.

For engineers reviewing the LTC2226H datasheet, LTC2226H pinout, LTC2226H application, or LTC2226H equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for automotive-grade high-speed data acquisition designs requiring stable AC performance across extended temperature ranges.

Technical Context

The LTC2226H 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 NMOS-switched 4pF sampling capacitors, with aperture delay fixed at 0ns and jitter specified at 0.2psRMS - enabling precise timing-critical sampling of wideband signals up to 575MHz full-power bandwidth.

It integrates a programmable reference system: SENSE pin selection configures ±0.5V or ±1V differential input range via internal 1.5V bandgap; MODE pin selects offset binary/2's complement output format and enables/disables the clock duty cycle stabilizer - a PLL-based circuit that enforces 50% internal duty cycle regardless of external CLK duty cycle (5–95%).

Key Specifications

Pinout & Package

48-lead (7mm × 7mm) plastic LQFP package with exposed pad (LX package); thermal resistance θ_JA = 53°C/W; max junction temperature 150°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9226BCPZ-25 and LTC2246H, the LTC2226H uniquely balances 12-bit resolution, 90dB SFDR, and automotive-grade temperature support in a pin-compatible family - making it optimal for space-constrained, thermally aggressive applications where spectral purity and reliability are co-prioritized.

Availability

LTC2226H is available at Aetrix Electronics and suitable for medical ultrasound front-ends, automotive radar receivers, wireless infrastructure IF digitizers, and industrial motor control feedback systems requiring stable component supply across extended temperature ranges.

Supply support for LTC2226H 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 LTC2226H belongs to ADI's high-speed precision ADC product line, designed specifically for applications demanding wide dynamic range, low power, and robust operation in harsh thermal environments - including automotive radar, medical imaging, and broadband communications.

FAQ

What is the maximum input frequency supported by the LTC2226H?

The LTC2226H has a 575MHz full-power bandwidth, meaning it can accurately digitize analog inputs up to that frequency before amplitude roll-off exceeds 3dB. This enables direct sampling of L-band RF signals (e.g., GPS L1 at 1.575GHz) when used with appropriate anti-alias filtering and undersampling techniques. The device maintains 71.4dB SNR at 5MHz and 71.2dB at 70MHz input, confirming usable performance well into VHF.

Does the LTC2226H require external reference components?

Yes, the LTC2226H requires external bypassing of REFH and REFL pins: a 0.1µF ceramic capacitor placed as close as possible to each pin, plus an additional 2.2µF ceramic capacitor shared between them, and a 1µF ceramic capacitor from REFL to GND. These are mandatory for stable reference operation and achieving specified SNR/SFDR. The internal 1.5V VCM reference also requires a 2.2µF bypass capacitor on Pins 44 and 45.

Can the LTC2226H operate with a non-50% duty cycle clock?

Yes - the LTC2226H includes an optional clock duty cycle stabilizer enabled via the MODE pin (set to 1/3VDD or 2/3VDD). When active, this internal PLL locks to the rising edge of the external CLK and generates a precise 50% duty cycle internal clock, allowing reliable operation with external clocks ranging from 5% to 95% duty cycle. A >1µs pulse on SHDN is required at power-up to initialize the stabilizer.

What are the power-down modes available on the LTC2226H?

The LTC2226H offers two low-power states: Nap Mode (SHDN = VDD, OE = GND) draws 15mW and retains register settings; Shutdown Mode (SHDN = VDD, OE = VDD) draws just 2mW and places all outputs in high-impedance. Both modes retain analog core bias but disable conversion. Recovery time is minimal - full performance resumes within one clock cycle after exiting either mode.

Is the LTC2226H pin-compatible with other devices in its family?

Yes, the LTC2226H is explicitly documented as pin-compatible with the LTC2246H (14-bit, 25Msps) and shares the same 48-pin LQFP package, pinout, and footprint. This allows hardware reuse across resolution tiers - for example, using LTC2226H for cost-sensitive deployments and LTC2246H for higher-precision variants - without PCB redesign or layout changes.