Analog Devices Inc. DC1532A-F

Overview

LTC2265-14 from Analog Devices (formerly Linear Technology) is a 14-bit, dual-channel, simultaneous-sampling analog-to-digital converter optimized for high-frequency communications signal digitization. It delivers 73.7dB SNR, 90dB SFDR, 0.15psRMS jitter, and operates at up to 65Msps on a single 1.8V supply - enabling undersampling of IF signals in cellular base stations and software-defined radios.

For engineers reviewing the LTC2265-14 datasheet, LTC2265-14 pinout, LTC2265-14 application, or LTC2265-14 equivalent, key selection criteria include its 2-channel simultaneous sampling architecture, serial LVDS output interface (1- or 2-lane), 800MHz full-power bandwidth, ±1LSB INL, and support for internal/external reference configurations with programmable input range (1–2VP-P).

Technical Context

The LTC2265-14 integrates two independent 14-bit ADC cores with shared PLL-based clocking and a digital serializer driving LVDS outputs. Its sample-and-hold stage features 800MHz full-power bandwidth and ultralow 0.15psRMS aperture jitter, enabling high-fidelity undersampling of RF/IF signals up to 140MHz.

Digital interface flexibility includes SPI configuration port and parallel mode control via CS/SCK/SDI pins; LVDS drivers support selectable 1.75mA or 3.5mA output current and optional internal 100Ω termination. Input common-mode bias (VCM1/VCM2) and reference programming (SENSE pin) allow precise analog front-end matching.

Key Specifications

Pinout & Package

40-lead (6mm × 6mm) plastic QFN package with exposed pad (Pin 41 = GND). Requires soldering exposed pad to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 14-bit ADC applications.

Compared with AD9250BCPZ-65 and LTC2264-14, the LTC2265-14 uniquely balances 65Msps performance, ultralow jitter, and LVDS simplicity - making it optimal for FPGA-based SDRs and compact comms hardware where JESD204B complexity or lower sampling rates are undesirable.

Availability

LTC2265-14 is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging requiring stable component supply and long-term production continuity.

Supply support for LTC2265-14 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 LTC2265-14 belongs to ADI's high-speed precision ADC product line, designed specifically for communications infrastructure and instrumentation applications demanding wide bandwidth, low jitter, and dual-channel coherence.

FAQ

What is the maximum sampling frequency supported by the LTC2265-14?

The LTC2265-14 supports a maximum sampling frequency of 65Msps under recommended operating conditions (VDD = OVDD = 1.8V, 2-lane LVDS mode). This rating is validated across the full industrial temperature range (–40°C to +85°C) and assumes proper layout, decoupling, and clock signal integrity. Exceeding 65Msps may degrade SNR and SFDR performance or violate timing margins.

Does the LTC2265-14 require an external reference voltage?

No - the LTC2265-14 includes an internal 1.25V reference (VREF pin) and supports both internal and external reference configurations. When SENSE is tied to VDD, the internal reference is selected with ±1V input range; applying 0.625–1.3V to SENSE configures an external reference mode with ±0.8×VSENSE input range. External reference use requires careful noise isolation but enables tighter system-level gain accuracy.

How does the LVDS output interface of the LTC2265-14 operate in 1-lane versus 2-lane mode?

In 1-lane mode, each channel outputs one bit per clock edge on a single LVDS pair (e.g., OUT1A+/–), resulting in a 14-bit serialization period of 1/(14 × fS). In 2-lane mode, bits are multiplexed across two LVDS pairs (e.g., OUT1A+/– and OUT1B+/–), halving the data rate per lane and easing timing closure on FPGA inputs. Mode selection is controlled via the CS pin in parallel programming mode.

Can the LTC2265-14 be used with single-ended encode clock inputs?

Yes - the ENC+ and ENC– inputs support both differential and single-ended operation. In single-ended mode, ENC– is tied to GND and ENC+ accepts TTL, CMOS, or LVDS logic levels (0–3.6V). The internal duty cycle stabilizer remains active, preserving AC performance across wide duty cycle variations (20–80%), which is especially valuable when using non-50% duty cycle clocks from PLLs or dividers.

What thermal management considerations apply to the LTC2265-14 in continuous 65Msps operation?

The LTC2265-14 has θJA = 32°C/W and TJMAX = 150°C. At 171mW total power dissipation and 25°C ambient, junction temperature rises ~5.5°C above ambient - well within safe limits. However, the exposed pad (Pin 41) must be soldered to a solid PCB ground plane with ≥4 thermal vias to ensure reliable heat transfer. Insufficient thermal relief increases θJA and risks parametric drift or long-term reliability issues.