Analog Devices Inc. LTC2258IUJ-12#PBF

Overview

LTC2258IUJ-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 65 Msps ultralow-power analog-to-digital converter optimized for high-frequency undersampling in communications systems. It delivers 71.1 dB SNR, 88 dB SFDR, and 0.17 ps_RMS aperture jitter with a single 1.8 V supply, supporting CMOS, DDR CMOS, or DDR LVDS outputs in a 40-pin QFN package.

For engineers reviewing the LTC2258IUJ-12#PBF datasheet, LTC2258IUJ-12#PBF pinout, LTC2258IUJ-12#PBF application, or LTC2258IUJ-12#PBF equivalent, this page provides verified functional specifications, validated pin roles, temperature-grade–specific performance data (–40°C to +85°C), and real-world interface configurations for IF sampling in SDR and base station receivers.

Technical Context

The LTC2258IUJ-12#PBF implements a 12-bit pipelined ADC architecture with integrated sample-and-hold featuring 800 MHz full-power bandwidth and programmable input range (1–2 V_P-P). Its low-noise front-end supports differential or single-ended clocking via ENC+/ENC– inputs, with optional duty cycle stabilization enabling robust operation across wide clock duty cycles.

Digital output flexibility includes full-rate CMOS, double-data-rate CMOS, and double-data-rate LVDS modes-each configurable via PAR/SER, SCK, and SPI register settings. Internal reference generation (VREF = 1.25 V ±25 ppm/°C) and common-mode bias (VCM = VDD/2 ±25 mV) are provided on dedicated pins, while serial configuration via CS/SCK/SDI/SDO supports dynamic mode switching without external logic.

Key Specifications

Pinout & Package

Package: 40-lead (6 mm × 6 mm) plastic QFN (UJ), exposed pad soldered to PCB ground for thermal and EMI performance. Operating temperature range: –40°C to +85°C (Industrial grade).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9226BSTZ-65, the LTC2258IUJ-12#PBF delivers superior dynamic range and flexible output interfaces at modest power cost; versus LTC2268IUJ-14#PBF, it trades 2 bits of resolution for 35.5 mW lower power and simplified digital interface timing.

Availability

LTC2258IUJ-12#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2258IUJ-12#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 aerospace, industrial, automotive, and communications markets.

The LTC2258IUJ-12#PBF belongs to ADI's high-speed precision ADC product line, engineered for demanding undersampling applications in wireless infrastructure and instrumentation where low jitter, high SFDR, and low power are simultaneously critical.

FAQ

What is the operating temperature range for the LTC2258IUJ-12#PBF?

The LTC2258IUJ-12#PBF is rated for industrial temperature operation from –40°C to +85°C. This is confirmed by the "I" grade designation in the part number and specified in the Absolute Maximum Ratings table. The device maintains full AC performance-including 71.1 dB SNR and 88 dB SFDR-at 85°C ambient, with derated power dissipation per thermal characteristics.

Does the LTC2258IUJ-12#PBF support both internal and external voltage references?

Yes, the LTC2258IUJ-12#PBF supports both internal and external references via the SENSE pin. When SENSE is tied to VDD, the internal 1.25 V reference is selected with ±1 V input range. When grounded, ±0.5 V range is enabled. Applying 0.625–1.3 V to SENSE selects an external reference and scales input range to ±0.8×V_SENSE. All configurations maintain ±0.3 LSB INL over temperature.

How does the duty cycle stabilizer function on the LTC2258IUJ-12#PBF?

The duty cycle stabilizer on the LTC2258IUJ-12#PBF is enabled by setting CS high in parallel programming mode (PAR/SER = VDD). It actively corrects asymmetric encode clocks, allowing high-performance operation even with 30%–70% duty cycle inputs. This eliminates need for external clock conditioners and maintains timing margins without increasing aperture jitter beyond 0.17 ps_RMS.

Can the LTC2258IUJ-12#PBF be used with an FPGA that only accepts LVDS inputs?

Yes, the LTC2258IUJ-12#PBF natively supports DDR LVDS output mode with programmable 1.75 mA or 3.5 mA current drive and on-chip 100 Ω termination. In this mode, D0_1± through D10_11± and CLKOUT± deliver fully compliant LVDS signals referenced to OVDD = 1.8 V, eliminating external terminators or level shifters for Xilinx or Intel FPGA interfaces.

What is the pipeline latency of the LTC2258IUJ-12#PBF in DDR CMOS mode?

The pipeline latency of the LTC2258IUJ-12#PBF is 5.5 clock cycles in double-data-rate CMOS output mode, as specified in the Timing Characteristics table. This fixed latency enables deterministic timing alignment in synchronous systems such as digital beamformers or real-time spectrum analyzers, and is independent of input frequency or output format configuration.