Analog Devices Inc. LTC2250IUH#PBF

Overview

LTC2250IUH#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 105Msps low-noise pipelined analog-to-digital converter optimized for high-frequency signal digitization in demanding communications and imaging systems. It operates from a single 3V supply (2.85V–3.4V), delivers 61.6dB SNR and 85dB SFDR at 70MHz input, supports flexible ±0.5V to ±1V differential input range, and features integrated clock duty cycle stabilizer and shutdown/nap modes.

For engineers reviewing the LTC2250IUH#PBF datasheet, LTC2250IUH#PBF pinout, LTC2250IUH#PBF application, or LTC2250IUH#PBF equivalent, key selection considerations include its 105Msps sampling rate, 640MHz full-power bandwidth, 32-pin 5mm × 5mm QFN package with exposed ground pad, and compatibility with differential analog drive topologies using VCM bias and external reference configuration via SENSE pin.

Technical Context

The LTC2250IUH#PBF implements a six-stage CMOS pipelined ADC architecture with 5-cycle pipeline latency, enabling deterministic timing for real-time signal processing. Its sample-and-hold circuit provides 640MHz full-power bandwidth and 0.2psRMS aperture jitter, supporting accurate digitization of wideband RF and IF signals up to Nyquist frequency.

It integrates a programmable internal 1.5V bandgap reference (VCM), flexible input range selection via SENSE pin (±0.5V to ±1V), and dual-mode output formatting (offset binary or 2's complement) controlled by MODE pin. Clock duty cycle stabilization allows high AC performance across non-50% duty cycle inputs without external correction circuitry.

Key Specifications

Pinout & Package

Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33), RoHS-compliant, lead-free (PBF). Exposed pad must be soldered to PCB ground 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 AD9215BRUZ-105 and ADS5272IPFP, the LTC2250IUH#PBF offers superior single-supply simplicity, integrated clock conditioning, and smaller QFN footprint-making it optimal for space- and power-constrained RF front-ends where parallel LVCMOS interfacing is preferred.

Availability

LTC2250IUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical imaging, spectral analysis, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to +85°C).

Supply support for LTC2250IUH#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 LTC2250IUH#PBF belongs to the Linear Technology LTC22xx family of ultra-low-noise, high-speed ADCs designed specifically for demanding RF/IF digitization in communications infrastructure, medical ultrasound, and test equipment where SNR, SFDR, and power efficiency are critical.

FAQ

What is the operating temperature range for the LTC2250IUH#PBF?

The LTC2250IUH#PBF is rated for industrial temperature operation from –40°C to +85°C, as indicated by the "I" grade in the part number. This rating applies to all specified DC and AC performance parameters unless otherwise noted in the datasheet, making it suitable for deployment in base stations, portable medical devices, and field-deployable test instruments.

Does the LTC2250IUH#PBF require an external reference voltage?

No, the LTC2250IUH#PBF includes an internal 1.5V bandgap reference and supports fully self-contained operation. The SENSE pin allows configuration of ±0.5V or ±1V differential input range using the internal reference. An external reference between 0.5V and 1V may be applied to SENSE for custom input scaling, but it is not required for standard operation.

How does the MODE pin affect the LTC2250IUH#PBF functionality?

The MODE pin on the LTC2250IUH#PBF serves two functions: it selects output data format (offset binary or 2's complement) and enables or disables the clock duty cycle stabilizer. Voltage thresholds on MODE determine behavior - e.g., grounding MODE selects offset binary and disables stabilizer, while applying 1/3 VDD enables stabilizer with offset binary format.

Can the LTC2250IUH#PBF interface directly with 1.8V logic systems?

Yes, the LTC2250IUH#PBF supports variable-output-voltage logic interfaces via the OVDD pin, which accepts 0.5V to 3.6V. When OVDD is set to 1.8V, the D0–D9 outputs and OF pin operate with 1.8V LVCMOS levels, enabling direct connection to FPGAs or processors with 1.8V I/O banks without level-shifting circuitry.

What is the purpose of the exposed pad (Pin 33) on the LTC2250IUH#PBF QFN package?

The exposed pad (Pin 33) on the LTC2250IUH#PBF is electrically connected to analog ground (GND) and serves dual thermal and electrical functions. It must be soldered to a solid PCB ground plane to ensure proper heat dissipation (θJA = 34°C/W) and minimize ground bounce and noise coupling into the sensitive analog front-end.