Analog Devices Inc. LTC2225IUH#PBF

Overview

LTC2225IUH#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 10 Msps low-power pipelined analog-to-digital converter operating from a single 3V supply (2.7V–3.4V), delivering 71.3 dB SNR and 90 dB SFDR at 5 MHz input with no missing codes. It features a 575 MHz full-power bandwidth sample-and-hold, clock duty cycle stabilizer, and flexible 1 V_P-P to 2 V_P-P input range - deployed in high-fidelity spectral analysis and portable instrumentation requiring precise wideband digitization.

For engineers reviewing the LTC2225IUH#PBF datasheet, LTC2225IUH#PBF pinout, LTC2225IUH#PBF application, or LTC2225IUH#PBF equivalent, key selection considerations include its 32-pin QFN package, differential/single-ended analog input support, 1.5 V common-mode output (VCM), OVDD-driven 0.5–3.6 V logic compatibility, and trade-offs between 1 V vs. 2 V input range on SNR/SFDR performance.

Technical Context

The LTC2225IUH#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 operates on the rising edge of CLK, with aperture jitter specified at 0.2 ps_RMS, enabling high-fidelity sampling beyond Nyquist.

Reference configuration is programmable via the SENSE pin: tied to VDD for ±1 V (2 V_P-P) input range, to VCM for ±0.5 V (1 V_P-P), or to an external voltage (0.5–1 V) for intermediate ranges. Output format (offset binary or 2's complement) and clock duty cycle stabilizer enablement are controlled by MODE pin voltage thresholds.

Key Specifications

Pinout & Package

Package: 32-lead (5 mm × 5 mm) plastic QFN with exposed pad (GND, Pin 33), RoHS-compliant and lead-free per #PBF suffix.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS5271IPFP, LTC2225IUH#PBF offers integrated reference, lower power, and clock stabilization - reducing BOM count and layout complexity. Versus LTC2245IUH#PBF, it trades 2 bits of resolution for 2.5 dB better SFDR and 15 mW lower power, favoring spurious-sensitive applications like spectral monitoring.

Availability

LTC2225IUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, portable test equipment, medical ultrasound, and RF spectrum analysis requiring stable component supply across industrial temperature grades (–40°C to +85°C).

Supply support for LTC2225IUH#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 LTC2225IUH#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding digitization tasks in communications receivers, instrumentation, and imaging systems where low power, high SFDR, and flexible input configuration are essential.

FAQ

What is the operating temperature range for the LTC2225IUH#PBF?

The LTC2225IUH#PBF is rated for industrial operation from –40°C to +85°C (I-grade), as indicated by the "I" in the part number. This is validated per the Absolute Maximum Ratings table and applies to all DC and AC specifications unless otherwise noted. The device uses internal thermal protection and is characterized across this full range for INL, DNL, SNR, and SFDR performance.

Does the LTC2225IUH#PBF require an external reference voltage?

No, the LTC2225IUH#PBF includes an internal 1.5 V bandgap reference and programmable reference buffer. It supports fully self-contained operation with ±0.5 V or ±1 V input ranges using only the SENSE pin connection. An external reference may be applied via SENSE for custom ranges (0.5–1 V), but is not required for standard operation.

How does the MODE pin affect output format and clock functionality in the LTC2225IUH#PBF?

The MODE pin voltage selects both output coding and clock duty cycle stabilizer status: GND → offset binary, stabilizer off; 1/3 VDD → offset binary, stabilizer on; 2/3 VDD → 2's complement, stabilizer on; VDD → 2's complement, stabilizer off. These thresholds are defined in the Electrical Characteristics table and verified over temperature.

Can the LTC2225IUH#PBF drive 1.8 V logic directly?

Yes, the LTC2225IUH#PBF supports 1.8 V logic interfacing via its independent OVDD supply pin (Pin 21). When OVDD = 1.8 V, VOH is guaranteed ≥1.79 V and VOL ≤0.09 V under load, meeting standard LVCMOS 1.8 V thresholds. OGND (Pin 20) must be connected to the same ground as the receiving logic.

What is the purpose of the OF (over/underflow) pin on the LTC2225IUH#PBF?

OF is an active-high, open-drain output that pulses high whenever the analog input exceeds the selected full-scale range (e.g., >±1 V for 2 V_P-P mode). It provides real-time saturation detection for automatic gain control (AGC) loops or fault logging without requiring software parsing of output codes - confirmed in the Functional Block Diagram and Timing Diagram sections.