Analog Devices Inc. LTC2215CUP#PBF

Overview

LTC2215CUP#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. Designed for communications receivers and spectrum analysis, it operates from a single 3.3V supply with 700mW power dissipation.

For engineers reviewing the LTC2215CUP#PBF datasheet, LTC2215CUP#PBF pinout, LTC2215CUP#PBF application, or LTC2215CUP#PBF equivalent, key selection criteria include its 65Msps sampling rate, differential LVDS/CMOS output flexibility, internal dither capability, clock duty cycle stabilizer, and 64-pin QFN package with exposed thermal pad.

Technical Context

The LTC2215CUP#PBF employs a pipelined ADC architecture with integrated sample-and-hold, internal reference generator, and correction logic. Its 400MHz full-power bandwidth supports undersampling of IF signals in direct-conversion receivers, while ultra-low 85fsRMS jitter preserves SNR at high input frequencies.

Dual-output interface options are supported: differential LVDS (standard or low-power mode) or single-ended CMOS with configurable full-rate or demultiplexed data buses. Clock inputs accept differential (LVDS/PECL) or single-ended (TTL/CMOS) signals, and an optional duty cycle stabilizer ensures performance across wide clock duty cycles.

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 integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9268BCPZ-65 and LTC2217CUP#PBF, the LTC2215CUP#PBF offers lower power and unique analog features (dither, duty cycle stabilizer) at 65Msps, making it optimal for cost-sensitive, jitter-constrained, or mixed-signal test equipment where parallel CMOS/LVDS interfacing is preferred over serial.

Availability

LTC2215CUP#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, test instrumentation, medical imaging, and defense electronics requiring stable component supply across extended production lifecycles.

Supply support for LTC2215CUP#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 digital signal processing semiconductors.

The LTC2215CUP#PBF belongs to the LTC22xx family of ultra-low-noise, high-SFDR ADCs designed specifically for demanding communications, instrumentation, and radar signal chain applications where spectral purity and timing fidelity are critical.

FAQ

What is the operating temperature range for the LTC2215CUP#PBF?

The LTC2215CUP#PBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is confirmed in the Order Information table and Absolute Maximum Ratings section of the datasheet. The "C" suffix in the part number explicitly denotes the 0°C to 70°C range, distinguishing it from the "I" grade (–40°C to 85°C) variants like LTC2215IUP#PBF.

Does the LTC2215CUP#PBF support both LVDS and CMOS digital outputs simultaneously?

No, the LTC2215CUP#PBF does not support simultaneous LVDS and CMOS outputs. Output mode is selected via the LVDS pin: logic high configures all 16 data outputs as differential LVDS pairs, while logic low enables single-ended CMOS outputs. The MODE pin further selects between full-rate or demultiplexed CMOS formats, but LVDS and CMOS are mutually exclusive configurations.

Can the LTC2215CUP#PBF be used with an external reference, and what are the supported voltages?

Yes, the LTC2215CUP#PBF supports external references via the SENSE pin. When SENSE is tied to VDD, the internal 2.5V bandgap reference is selected. An external reference of either 2.5V or 1.25V may be applied to SENSE; both values configure the ADC for a 2.75VP-P full-scale input range, as stated in the Pin Functions section and Electrical Characteristics tables.

What is the data latency of the LTC2215CUP#PBF, and is it deterministic?

The LTC2215CUP#PBF has a fixed, deterministic data latency of 7 clock cycles from ENC+ edge to valid output data. This is explicitly specified in the Timing Characteristics table under "Data Latency" for both LVDS and CMOS output modes. The latency remains constant across temperature, supply, and process variations, enabling precise timing alignment in synchronous digital systems.

Is the LTC2215CUP#PBF pin-compatible with other devices in the LTC22xx family?

Yes, the LTC2215CUP#PBF is pin-compatible with the LTC2208 and LTC2217, as noted in the Features list. This includes identical 64-pin QFN footprint, matching pin functions (e.g., AIN+, ENC+, SHDN), and compatible power/ground arrangements. However, performance parameters (e.g., sampling rate, power) differ: LTC2208 is 16-bit/105Msps, LTC2217 is 16-bit/80Msps, while LTC2215CUP#PBF is 16-bit/65Msps.

How does the internal dither function improve SFDR in the LTC2215CUP#PBF?

When enabled via the DITH pin, the internal dither adds controlled noise to the ADC's analog front-end, breaking up correlation between quantization error and input signal. As shown in the Typical Performance Characteristics (Figures G53, G54, G66), this improves SFDR by up to 10dB at –25dBFS input levels-critical for resolving low-level spurs in spectrum analysis and communications testing applications using the LTC2215CUP#PBF.