Analog Devices Inc. LTC2248IUH#PBF

Overview

LTC2248IUH#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 65Msps low-power pipelined analog-to-digital converter operating from a single 3V supply. It delivers 74.3dB SNR and 90dB SFDR at Nyquist, features 575MHz full-power bandwidth, clock duty cycle stabilization, and shutdown/nap modes. It is designed for high-fidelity digitization in ultrasound imaging and broadband communications systems.

For engineers reviewing the LTC2248IUH#PBF datasheet, LTC2248IUH#PBF pinout, LTC2248IUH#PBF application, or LTC2248IUH#PBF equivalent, key selection criteria include its 14-bit resolution at 65Msps, ±1LSB INL, flexible 1VP-P to 2VP-P input range, and QFN-32 package with exposed thermal pad.

Technical Context

The LTC2248IUH#PBF implements a six-stage CMOS pipelined ADC architecture with digital correction logic, achieving 5-cycle pipeline latency. Its sample-and-hold circuit supports differential or single-ended inputs with programmable common-mode bias via the VCM pin and configurable reference range via the SENSE pin.

It integrates a clock duty cycle stabilizer to maintain AC performance across wide input clock duty cycles, and supports offset binary or 2's complement output formats selected by the MODE pin. Output drivers are powered separately via OVDD (0.5V–3.6V), enabling direct interfacing with diverse logic families.

Key Specifications

Pinout & Package

The LTC2248IUH#PBF is housed in a 32-pin (5mm × 5mm) plastic QFN package with exposed thermal pad (Pin 33) that 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 AD9246BCPZ-65 and LTC2249CUH#PBF, the LTC2248IUH#PBF offers the lowest power (205mW) and widest industrial temperature range (–40°C to 85°C) while maintaining identical pinout and feature set within the LTC224x family - making it optimal for thermally constrained, field-deployed instrumentation.

Availability

LTC2248IUH#PBF is available at Aetrix Electronics and suitable for ultrasound imaging systems, wireless baseband receivers, and portable spectral analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2248IUH#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2248IUH#PBF belongs to the LTC224x family of low-power, high-speed ADCs engineered specifically for demanding medical imaging, test equipment, and communications infrastructure where SNR, SFDR, and thermal efficiency are critical.

FAQ

What is the operating temperature range for the LTC2248IUH#PBF?

The LTC2248IUH#PBF is rated for industrial operation from –40°C to +85°C, as indicated by the "I" grade suffix. This exceeds the commercial-grade LTC2248CUH#PBF (0°C to 70°C) and ensures reliability in harsh environments such as field-deployed medical or industrial equipment where ambient temperatures fluctuate widely.

Does the LTC2248IUH#PBF require an external reference voltage?

No, the LTC2248IUH#PBF includes an internal 1.5V reference and VCM output pin. When SENSE is tied to VCM, it configures a ±0.5V input range using the internal reference. An external reference can be applied to SENSE only if a custom range between ±0.5V and ±1V is needed - otherwise, no external reference is required for standard operation.

How does the MODE pin affect the LTC2248IUH#PBF's output format and clock handling?

The MODE pin on the LTC2248IUH#PBF selects both output coding and clock duty cycle stabilization. Ground = offset binary, DCS off; 1/3 VDD = offset binary, DCS on; 2/3 VDD = 2's complement, DCS on; VDD = 2's complement, DCS off. This dual function allows trade-offs between timing robustness and data representation without changing hardware layout.

Can the LTC2248IUH#PBF drive standard CMOS logic directly?

Yes, the LTC2248IUH#PBF's D0–D13 outputs are CMOS-compatible and can drive standard logic families. The output voltage levels are determined by OVDD (0.5V–3.6V), and specifications guarantee VOH ≥ 2.7V and VOL ≤ 0.4V at OVDD = 3V and 1.6mA load - meeting 3.3V and 2.5V CMOS thresholds. For 1.8V logic, OVDD must be set to 1.8V with corresponding VOH/VOL limits.

What is the purpose of the OF (Over/Under Flow) pin on the LTC2248IUH#PBF?

The OF pin on the LTC2248IUH#PBF is an active-high flag that asserts when the analog input exceeds the selected full-scale range - indicating either overrange (positive saturation) or underrange (negative saturation). This real-time clipping indicator enables closed-loop AGC systems to dynamically adjust front-end gain and prevent data corruption due to ADC saturation during transient signal events.