Analog Devices Inc. LTC2253CUH#PBF

Overview

LTC2253CUH#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 125Msps low-power pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications and imaging systems. It operates from a single 3V supply (2.85V–3.4V), delivers 70.2dB SNR and 88dB SFDR at 5MHz input, features 640MHz full-power bandwidth, clock duty cycle stabilizer, and supports flexible ±0.5V to ±1V differential input ranges.

For engineers reviewing the LTC2253CUH#PBF datasheet, LTC2253CUH#PBF pinout, LTC2253CUH#PBF application, or LTC2253CUH#PBF equivalent, key selection criteria include sampling rate stability at 125Msps, SNR/SFDR trade-offs across RF input frequencies up to 140MHz, power consumption in shutdown/nap modes (2mW/15mW), and compatibility with 5mm × 5mm QFN-32 layouts requiring exposed-pad grounding.

Technical Context

The LTC2253CUH#PBF implements a six-stage CMOS pipelined ADC architecture with 5-cycle pipeline latency and integrated sample-and-hold. Its clock duty cycle stabilizer enables consistent AC performance across wide input clock duty cycles (30%–70%), while internal 1.5V VCM bias and programmable SENSE pin support ±0.5V or ±1V differential input ranges without external reference components.

It uses differential analog inputs (AIN+, AIN−) referenced to internal or external REFH/REFL, with digital outputs driven by separate OVDD (0.5V–3.6V) for logic-level flexibility. The device includes dedicated OF (over/underflow), SHDN, OE, and MODE pins for real-time format control (offset binary/2's complement) and power-state management.

Key Specifications

Pinout & Package

The LTC2253CUH#PBF is housed in a 32-lead (5mm × 5mm) plastic QFN package with exposed thermal pad (Pin 33) that must be soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9226BCPZ-105 and LTC2263IUP#PBF, the LTC2253CUH#PBF uniquely balances 125Msps speed, sub-400mW power, and clock robustness-making it optimal for space-constrained, battery-aware, or wide-dynamic-range RF digitizers where 12-bit resolution suffices.

Availability

LTC2253CUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical imaging, spectral analysis, and portable instrumentation requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LTC2253CUH#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 LTC2253CUH#PBF belongs to ADI's high-speed data converter product line, designed specifically for demanding RF and IF digitization tasks where speed, linearity, and power efficiency must coexist in compact form factors.

FAQ

What is the maximum input frequency supported by the LTC2253CUH#PBF before SNR degradation exceeds 3dB?

The LTC2253CUH#PBF maintains ≥68dB SNR up to 70MHz input frequency under –1dBFS conditions, per Figure G09. Beyond 70MHz, SNR falls to 66.5dB at 140MHz due to aperture jitter and bandwidth limitations. For applications requiring <3dB SNR loss, design input spectra to stay below 70MHz or implement external anti-alias filtering.

How does the SENSE pin configuration affect the full-scale input range of the LTC2253CUH#PBF?

The SENSE pin directly programs the LTC2253CUH#PBF's differential input range: tying SENSE to VDD selects ±1V (2V_PP), to VCM selects ±0.5V (1V_PP), and to an external voltage between 0.5V–1V scales range linearly to ±V_SENSE. This eliminates external resistor networks and enables dynamic range adaptation in software-defined radio front-ends.

Can the LTC2253CUH#PBF operate with a 2.5V OVDD supply while maintaining full-speed 125Msps performance?

Yes-the LTC2253CUH#PBF supports OVDD from 0.5V to 3.6V. At OVDD = 2.5V, VOH remains ≥2.49V and VOL ≤0.09V under 1.6mA load (per page 4), ensuring clean logic transitions into 2.5V FPGA I/O banks. No speed derating occurs; timing parameters (t_D, t_ACCESS) remain valid per Table on page 5.

What thermal management is required for continuous operation of the LTC2253CUH#PBF at 125Msps?

The LTC2253CUH#PBF has θ_JA = 34°C/W and T_JMAX = 125°C. At 395mW dissipation and 25°C ambient, junction temperature reaches ~38°C-well within limit. Mandatory soldering of the exposed pad (Pin 33) to a ≥1cm² copper pour is required to maintain thermal resistance; insufficient pad connection risks exceeding T_JMAX above 85°C ambient.

Does the LTC2253CUH#PBF support daisy-chained JESD204B serial output, or is it parallel-only?

The LTC2253CUH#PBF provides only parallel CMOS digital outputs (D0–D11, OF) and does not integrate JESD204B serialization. It requires external FPGA or ASIC logic to capture 12-bit words at 125MHz and serialize if needed. For native JESD204B, consider AD9628 or LTC2274 families instead.