Analog Devices Inc. LTC2215IUP#PBF

Overview

LTC2215IUP#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 65Msps low-noise analog-to-digital converter optimized for high-frequency signal digitization up to 400MHz full-power bandwidth. It features 81.5dBFS noise floor, 100dB spurious-free dynamic range (SFDR), and 85fsRMS aperture jitter, operating from a single 3.3V supply with 700mW power dissipation. It is used in cellular base station receivers and spectrum analyzers requiring wide dynamic range and undersampling capability.

For engineers reviewing the LTC2215IUP#PBF datasheet, LTC2215IUP#PBF pinout, LTC2215IUP#PBF application, or LTC2215IUP#PBF equivalent, key selection considerations include its 65Msps sampling rate, differential LVDS/CMOS output flexibility, –40°C to +85°C industrial temperature grade, internal dither option, and pin compatibility with LTC2208/LTC2217.

Technical Context

The LTC2215IUP#PBF employs a pipelined ADC architecture with integrated sample-and-hold, internal reference generator, and clock duty cycle stabilizer. Its analog input accepts differential signals with fixed 2.75V_P-P range and 1.575V common-mode bias (VCM), supporting undersampling of RF inputs up to 400MHz.

Digital outputs are configurable as either standard or low-power LVDS (100Ω load) or single-ended CMOS with programmable swing (0.5V–3.6V). Control pins-SHDN, DITH, MODE, LVDS, and RAND-enable power-down, dither activation, output format selection, and data randomization without external logic.

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 AD9268BCPZ-65 and LTC2217IUP#PBF, the LTC2215IUP#PBF offers superior parallel interface flexibility and integrated dither for spur-sensitive applications, while trading off serial interface capability and maximum sample rate-making it optimal for cost-sensitive, FPGA-connected RF receivers needing proven analog performance at 65Msps.

Availability

LTC2215IUP#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, test equipment, and medical imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2215IUP#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and DSP technologies, serving precision instrumentation, communications, and industrial markets.

The LTC2215IUP#PBF belongs to the Linear Technology LTC22xx family of ultra-low-noise, high-SFDR pipeline ADCs designed specifically for demanding communications and instrumentation applications where dynamic range and jitter sensitivity are critical.

FAQ

What is the maximum analog input frequency supported by the LTC2215IUP#PBF?

The LTC2215IUP#PBF supports a full-power bandwidth of 400MHz, meaning it can accurately digitize analog input signals up to 400MHz while maintaining specified SNR and SFDR performance. This enables direct undersampling of IF or RF signals in receiver architectures without requiring additional bandpass filtering prior to the ADC input.

Does the LTC2215IUP#PBF require an external reference voltage?

No-the LTC2215IUP#PBF includes an internal 2.5V bandgap reference. When SENSE (Pin 1) is tied to VDD, the device uses this internal reference to set the 2.75V_P-P full-scale input range. An external 2.5V or 1.25V reference may be applied to SENSE for alternative scaling, but it is not required for standard operation of the LTC2215IUP#PBF.

How does the clock duty cycle stabilizer in the LTC2215IUP#PBF improve system performance?

The clock duty cycle stabilizer in the LTC2215IUP#PBF corrects non-50% duty cycle encode clocks internally, enabling full 65Msps performance even with asymmetric clock sources (e.g., from PLLs or dividers). This eliminates the need for external duty-cycle correction circuits and ensures consistent aperture timing, preserving SNR and SFDR across varying clock conditions.

Can the LTC2215IUP#PBF operate with CMOS outputs at 1.8V logic levels?

Yes-the LTC2215IUP#PBF supports CMOS output swing from 0.5V to 3.6V via the OVDD supply. With OVDD = 1.8V, VOH is guaranteed ≥1.79V and VOL ≤0.1V under load, making it fully compatible with 1.8V FPGA I/O banks. Output drive strength and timing remain characterized across this range per the LTC2215IUP#PBF datasheet.

What is the purpose of the RAND pin on the LTC2215IUP#PBF?

The RAND pin on the LTC2215IUP#PBF enables a data output randomizer that XORs the digital output word with a pseudo-random sequence. This spreads deterministic spectral energy across the Nyquist band, reducing discrete EMI peaks and easing electromagnetic compatibility (EMC) certification-especially valuable in compact RF modules where radiated emissions are tightly constrained.