Analog Devices Inc. LTC2258CUJ-14#PBF

Overview

LTC2258CUJ-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 65 Msps ultralow-power pipelined analog-to-digital converter with 74 dB SNR and 88 dB SFDR, designed for high-frequency undersampling in communications signal chains. It operates from a single 1.8 V supply, supports CMOS/DDR CMOS/DDR LVDS outputs, and features 800 MHz full-power bandwidth, 0.17 psRMS jitter, and SPI-configurable modes including shutdown and nap.

For engineers reviewing the LTC2258CUJ-14#PBF datasheet, LTC2258CUJ-14#PBF pinout, LTC2258CUJ-14#PBF application, or LTC2258CUJ-14#PBF equivalent, this device is critical for RF sampling in cellular base stations, software-defined radios, and portable medical imaging where dynamic range, power efficiency, and IF undersampling capability are essential selection criteria.

Technical Context

The LTC2258CUJ-14#PBF implements a 14-bit pipelined ADC architecture with integrated sample-and-hold, correction logic, and configurable digital output drivers. Its 0.17 psRMS aperture jitter enables clean undersampling of IF signals up to 140 MHz while maintaining 74 dB SNR at 65 Msps.

Dual reference options (internal 1.25 V or external 0.625–1.3 V via SENSE pin) support selectable 1–2 VP-P input ranges. Clock interface accepts differential (ENC+/ENC–) or single-ended inputs, with optional duty cycle stabilizer enabling robust operation across wide clock duty cycles.

Key Specifications

Pinout & Package

40-pin (6 mm × 6 mm) plastic QFN package (UJ) with exposed thermal pad (Pin 41 = GND). Requires soldering exposed pad to PCB ground plane 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 AD9246BCPZ-65, the LTC2258CUJ-14#PBF offers integrated reference, SPI programmability, and multiple output formats at slightly lower SFDR - ideal for adaptive, space-constrained, or low-power systems. Versus LTC2268IUJ-14#PBF, it trades speed for reduced power (81 mW vs 125 mW) and commercial temperature range, making it optimal for cost- and thermal-sensitive base-station or portable applications.

Availability

LTC2258CUJ-14#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2258CUJ-14#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 acquired Linear Technology in 2017 and maintains its high-performance analog product lines, including precision data converters, power management ICs, and RF solutions for demanding industrial and communications markets.

The LTC2258CUJ-14#PBF belongs to Linear's ultralow-jitter, low-power pipeline ADC family engineered for RF sampling in wireless infrastructure, defense electronics, and high-fidelity test equipment where dynamic range and power efficiency are co-optimized.

FAQ

What is the operating temperature range for the LTC2258CUJ-14#PBF?

The LTC2258CUJ-14#PBF is specified for 0°C to 70°C ambient operation (C-grade), as indicated by the "C" in the part number. This distinguishes it from the I-grade version (LTC2258IUJ-14#PBF), which supports –40°C to 85°C. The C-grade variant is optimized for commercial and indoor infrastructure applications where thermal margins are well controlled.

Does the LTC2258CUJ-14#PBF support both internal and external voltage references?

Yes, the LTC2258CUJ-14#PBF supports both internal and external references. An internal 1.25 V reference is enabled by tying the SENSE pin to VDD (±1 V input range) or GND (±0.5 V). Applying 0.625–1.3 V to SENSE selects an external reference and scales the input range to ±0.8× that voltage - providing precise gain control for sensor interfaces or calibrated measurement systems.

How does the PAR/SER pin affect the functionality of the LTC2258CUJ-14#PBF?

The PAR/SER pin determines the programming interface mode of the LTC2258CUJ-14#PBF. When grounded, it enables full serial SPI control (CS/SCK/SDI/SDO) for configuring randomizer, nap mode, output format, and reference settings. When tied to VDD, it activates parallel mode where CS, SCK, and SDI become dedicated logic inputs for simplified hardware-based control - reducing MCU overhead in fixed-function systems.

What output interface options does the LTC2258CUJ-14#PBF provide, and how are they selected?

The LTC2258CUJ-14#PBF supports three output modes: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Mode selection is controlled via the SCK pin in parallel programming mode (PAR/SER = VDD): SCK low enables full-rate CMOS; SCK high enables DDR LVDS (3.5 mA mode). DDR CMOS is selected via SPI register configuration when PAR/SER = GND.

Is the LTC2258CUJ-14#PBF pin-compatible with other members of the LTC225x-14 family?

Yes, the LTC2258CUJ-14#PBF is fully pin-compatible with the LTC2257-14 and LTC2256-14 in the same 40-pin QFN (UJ) package. This allows direct substitution across 65/40/25 Msps variants without PCB changes - enabling scalable system design, performance binning, and seamless migration during prototyping or production ramp.