Analog Devices Inc. DC854D-F

Overview

LTC2217 from Analog Devices (acquired Linear Technology) is a 16-bit, 105Msps analog-to-digital converter optimized for high-frequency undersampling applications up to 400MHz full-power bandwidth, with fixed 2.75V_P-P differential input range, 81.3dBFS noise floor, and 85fs_RMS aperture jitter. It serves as the front-end digitizer in wideband receivers, spectrum analyzers, and cellular base station transceivers.

For engineers reviewing the LTC2217 datasheet, LTC2217 pinout, LTC2217 application, or LTC2217 equivalent, key selection criteria include its 100dB spurious-free dynamic range at 5MHz, LVDS/CMOS output flexibility, internal clock duty cycle stabilizer, and compatibility with 3.3V single-supply operation and external dither control.

Technical Context

The LTC2217 employs a 16-bit pipelined ADC architecture with integrated sample-and-hold, correction logic, and programmable output formatting. Its 400MHz full-power bandwidth supports direct RF sampling of IF signals up to 70MHz while maintaining ≥79.3dBFS SNR and ≥83dBc SFDR.

Dual-output mode support includes standard or low-power LVDS (100Ω differential termination) and configurable CMOS (full-rate or demultiplexed), with separate OVDD supply enabling 0.5V–3.6V output swing. Clock interface accepts differential (LVDS/PECL/TTL/CMOS) or single-ended inputs, and optional duty cycle stabilization ensures timing integrity across 30%–70% duty cycles.

Key Specifications

Pinout & Package

64-pin (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND). Pin 1 is SENSE; pins 2, 4, 7, 10, 11, 14, 18, and exposed pad are GND; VDD supplied on pins 5, 6, 15, 16, 17; dual-bus digital outputs occupy pins 21–30, 33–38, 41–48, 51–59.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9268BCPZ-105 and ADS5463IPFP, the LTC2217 delivers superior SFDR consistency across frequency bands and unique configurability via pin-strapped dither, duty cycle stabilization, and output mode selection-making it optimal for cost-sensitive, high-dynamic-range IF sampling where deterministic latency and single-supply operation are critical.

Availability

LTC2217 is available at Aetrix Electronics and suitable for cellular infrastructure, test equipment, spectrum monitoring, and medical imaging systems requiring stable component supply and long-term obsolescence management.

Supply support for LTC2217 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 LTC2217 belongs to ADI's high-speed precision ADC product line, engineered specifically for demanding wideband receiver applications where SFDR, jitter, and flexible digital interfacing are primary design constraints.

FAQ

What is the maximum analog input frequency supported by the LTC2217?

The LTC2217 features a 400MHz full-power bandwidth sample-and-hold amplifier, enabling reliable digitization of analog input signals up to 400MHz. At 70MHz input frequency, the LTC2217 maintains 79.3dBFS SNR and 83dBc SFDR, making it suitable for undersampling IF stages in communications receivers and spectrum analyzers.

Does the LTC2217 support both LVDS and CMOS digital outputs?

Yes, the LTC2217 supports both LVDS and CMOS digital outputs via the LVDS pin (Pin 61). Connecting LVDS to VDD selects standard LVDS mode; to 2/3VDD selects low-power LVDS; to 0V selects full-rate CMOS; and to 1/3VDD selects demultiplexed CMOS. This eliminates need for external level-shifting or interface translation circuits.

How does the internal dither function improve performance in the LTC2217?

The LTC2217's internal dither (enabled via DITH pin) adds controlled noise to the analog path, breaking up harmonic correlation and improving SFDR by up to 10dB at low input levels (e.g., –25dBFS). With dither "ON", SFDR reaches 115dBFS at 5MHz, significantly enhancing weak-signal detectability in spectrum analysis applications.

What is the purpose of the MODE pin on the LTC2217?

The MODE pin (Pin 62) configures two independent functions: output data format (offset binary or 2's complement) and clock duty cycle stabilizer enable/disable. Voltage levels (0V, 1/3VDD, 2/3VDD, VDD) select combinations-e.g., 2/3VDD enables 2's complement format and activates the stabilizer, ensuring robust timing with asymmetric clocks.

Is the LTC2217 pin-compatible with other devices in its family?

Yes, the LTC2217 is pin-compatible with the LTC2208, sharing identical 64-pin QFN packaging and pin assignments for analog inputs, clock, power, and ground. This allows drop-in replacement in existing designs targeting higher sample rates (105Msps vs 80Msps) and improved SFDR (100dB vs 95dB), provided layout and decoupling meet LTC2217's tighter jitter requirements.