Analog Devices Inc. LTC2240IUP-12#PBF

Overview

LTC2240IUP-12#PBF from Analog Devices (acquired Linear Technology) is a 12-bit, 170Msps pipelined analog-to-digital converter optimized for high-frequency communications signal digitization. It delivers 65.6dB SNR, 80dB SFDR at 10MHz input, and ultralow 95fs_RMS aperture jitter, enabling high-fidelity IF undersampling in wireless infrastructure and cable head-end systems.

For engineers reviewing the LTC2240IUP-12#PBF datasheet, LTC2240IUP-12#PBF pinout, LTC2240IUP-12#PBF application, or LTC2240IUP-12#PBF equivalent, key selection criteria include its 1.2GHz full-power bandwidth, ±0.5V/±1V selectable input range, LVDS/CMOS/demux-CMOS output flexibility, –40°C to +85°C industrial temperature rating, and 64-pin 9mm × 9mm QFN package with exposed thermal pad.

Technical Context

The LTC2240IUP-12#PBF implements a five-stage CMOS pipelined ADC architecture with integrated sample-and-hold, correction logic, and flexible reference buffering. Its differential analog input path supports 1.2GHz full-power bandwidth and accepts ±0.5V or ±1V ranges via SENSE pin configuration.

Digital interface options include LVDS (247–454mV differential swing), full-rate CMOS (0.5–2.625V OVDD), or demultiplexed CMOS with interleaved/simultaneous update modes. Clocking supports differential ENC+/ENC– inputs with optional duty cycle stabilizer, and pipeline latency is fixed at 5 cycles in all output modes.

Key Specifications

Pinout & Package

64-pin 9mm × 9mm plastic QFN package with exposed thermal pad (Pin 65 = GND). Requires soldering of 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 high-speed ADC applications.

Compared with AD9230-12 and ADS5463, the LTC2240IUP-12#PBF provides optimal balance of 170Msps speed, 65.6dB SNR, 2.5V single-supply operation, and compact 9mm QFN-making it ideal for space-constrained, thermally sensitive telecom front-ends where 1.2GHz bandwidth and 95fs jitter are critical.

Availability

LTC2240IUP-12#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, cable head-end systems, and RF test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2240IUP-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 precision instrumentation, communications, and industrial markets.

The LTC2240 family was designed by Linear Technology (now ADI) specifically for demanding communications applications requiring high dynamic range, low jitter, and flexible digital interfacing in compact packages-targeting base station receivers, broadband test gear, and linearization systems.

FAQ

What is the operating temperature range of the LTC2240IUP-12#PBF?

The LTC2240IUP-12#PBF is rated for operation from –40°C to +85°C, qualifying it for industrial and outdoor telecommunications equipment. This extended temperature grade distinguishes it from the commercial-grade LTC2240CUP-12#PBF (0°C to 70°C) and ensures reliable performance in uncontrolled environments such as cellular base station cabinets or cable head-end shelters where ambient temperatures fluctuate widely.

Does the LTC2240IUP-12#PBF support both LVDS and CMOS output interfaces?

Yes, the LTC2240IUP-12#PBF supports three digital output configurations via the LVDS pin (Pin 57): LVDS mode (LVDS = VDD), full-rate CMOS (LVDS = GND), and demultiplexed CMOS with either interleaved or simultaneous update (LVDS = 1/3VDD or 2/3VDD). In LVDS mode, it delivers 247–454mV differential swing into 100Ω loads; in CMOS mode, OVDD is configurable from 0.5V to 2.625V for FPGA I/O voltage matching.

How does the SENSE pin configure input range on the LTC2240IUP-12#PBF?

The SENSE pin (Pin 59) configures the LTC2240IUP-12#PBF's differential input range: connecting SENSE to VCM selects ±0.5V, connecting to VDD selects ±1V, and applying an external voltage between 0.5V and 1V sets a precise ±V_SENSE range. This hardware-based selection eliminates software register writes or external gain components, enabling rapid reconfiguration for different RF front-end stages while maintaining DC-coupled signal integrity.

What is the pipeline latency of the LTC2240IUP-12#PBF, and how does it vary with output mode?

The LTC2240IUP-12#PBF has a fixed pipeline latency of 5 conversion cycles in all output modes-full-rate CMOS, demultiplexed CMOS (interleaved or simultaneous), and LVDS. This deterministic latency simplifies timing closure in FPGA-based digital downconverters and enables predictable phase alignment in closed-loop DPD systems, unlike variable-latency architectures that require complex buffer management.

Can the LTC2240IUP-12#PBF operate with a single-ended clock input?

Yes, the LTC2240IUP-12#PBF accepts single-ended clock inputs on ENC+ (Pin 17) while tying ENC– (Pin 18) to ground through a 0.1μF capacitor, as specified in the datasheet. However, differential clocking is strongly recommended to maximize noise immunity and achieve the specified 95fs_RMS aperture jitter; single-ended operation may degrade jitter performance by 20–30fs depending on PCB layout and source impedance.