Analog Devices Inc. LTC2258IUJ-14#PBF

Overview

LTC2258IUJ-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 65 Msps ultralow-power pipelined ADC optimized for undersampling wideband IF signals in communications infrastructure. It delivers 74 dB SNR and 88 dB SFDR at 70 MHz input, operates from a single 1.8 V supply, supports CMOS/DDR-CMOS/DDR-LVDS outputs, and features 0.17 ps_RMS aperture jitter - enabling high-fidelity digitization in cellular base stations and software-defined radios.

For engineers reviewing the LTC2258IUJ-14#PBF datasheet, LTC2258IUJ-14#PBF pinout, LTC2258IUJ-14#PBF application, or LTC2258IUJ-14#PBF equivalent, key selection criteria include its 65 Msps sampling rate with 800 MHz full-power bandwidth, selectable 1–2 V_P-P input range, integrated clock duty cycle stabilizer, and SPI-configurable operation across industrial temperature (–40°C to +85°C).

Technical Context

The LTC2258IUJ-14#PBF employs a 14-bit pipelined architecture with on-chip sample-and-hold and correction logic, supporting differential analog inputs up to 800 MHz bandwidth. Its ENC+/ENC– interface accepts sine wave, PECL, LVDS, TTL, or CMOS clocks, and optional duty cycle stabilization ensures consistent performance across non-50% clock duty cycles.

Digital output flexibility includes full-rate CMOS, double-data-rate CMOS, or DDR-LVDS modes, with separate OVDD supply (1.2–1.9 V) enabling voltage-level control of CMOS swings. Internal reference yields ±1 LSB INL and ±0.3 LSB DNL, while transition noise is specified at 1.13 LSB_RMS.

Key Specifications

Pinout & Package

40-pin (6 mm × 6 mm) plastic QFN package (UJ), exposed pad soldered to PCB ground. Pin functions are mode-dependent (CMOS/LVDS); full-rate CMOS uses individual D0–D13 outputs, DDR-CMOS pairs outputs (e.g., D0_1), and DDR-LVDS provides differential pairs (e.g., D0_1+, D0_1–). Exposed pad (Pin 41) is GND and must be soldered.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9246BCPZ-65, LTC2258IUJ-14#PBF integrates reference, clock stabilization, and SPI control - reducing BOM count and layout complexity. Versus LTC2268IUJ-14#PBF, it trades speed for lower power and cost in fixed-bandwidth applications.

Availability

LTC2258IUJ-14#PBF is available at Aetrix Electronics and suitable for cellular base stations, portable medical imaging, and nondestructive testing requiring stable component supply across extended industrial temperature ranges.

Supply support for LTC2258IUJ-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 signal chain portfolio, emphasizing precision, speed, and power efficiency in data converters and analog ICs.

The LTC2258IUJ-14#PBF belongs to Linear's ultralow-jitter, low-power ADC family designed specifically for demanding communications and instrumentation applications requiring high dynamic range at RF/IF frequencies.

FAQ

What is the maximum analog input frequency supported by the LTC2258IUJ-14#PBF?

The LTC2258IUJ-14#PBF features an 800 MHz full-power bandwidth, meaning it can accurately digitize analog signals up to 800 MHz without significant amplitude roll-off. This enables direct undersampling of IF signals well into the UHF band, provided the sampling rate (65 Msps) satisfies Nyquist criteria for the desired alias zone.

Does the LTC2258IUJ-14#PBF support both internal and external voltage references?

Yes, the LTC2258IUJ-14#PBF supports both. Connecting the SENSE pin to VDD selects the internal 1.25 V reference with ±1 V input range; grounding SENSE selects ±0.5 V range; applying 0.625–1.3 V to SENSE configures a proportional ±0.8× input range. Internal reference achieves ±1 LSB INL and ±0.3 LSB DNL over temperature.

How does the clock duty cycle stabilizer function in the LTC2258IUJ-14#PBF?

The LTC2258IUJ-14#PBF's clock duty cycle stabilizer corrects non-50% duty cycle clocks applied to ENC+/ENC–, ensuring consistent sampling aperture timing. Enabled via CS pin high in parallel mode, it maintains 74 dB SNR and 88 dB SFDR even with 20–80% duty cycle inputs - eliminating need for external clock conditioners in space-constrained designs.

What digital output interfaces does the LTC2258IUJ-14#PBF support, and how are they selected?

The LTC2258IUJ-14#PBF supports full-rate CMOS, double-data-rate CMOS, and double-data-rate LVDS outputs. Selection is determined by PAR/SER pin state (serial vs. parallel mode) and SCK level in parallel mode: SCK low enables full-rate CMOS; SCK high enables DDR-LVDS. DDR-CMOS is default in serial mode with appropriate register settings.

What power-saving modes are available on the LTC2258IUJ-14#PBF, and what are their typical power levels?

The LTC2258IUJ-14#PBF offers Nap mode (9 mW) and Sleep mode (0.5 mW), both accessible via SDI pin in parallel programming mode or SPI register in serial mode. These modes retain register state and enable sub-millisecond wake-up, making them ideal for TDD systems, battery-powered instruments, or burst-mode acquisition where continuous sampling is unnecessary.