Analog Devices Inc. LTC2217CUP#PBF

Overview

LTC2217CUP#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 105Msps analog-to-digital converter optimized for high-frequency signal digitization up to 400MHz full-power bandwidth. It features a fixed 2.75V_P-P differential input range, 81.3dBFS noise floor, 100dB spurious-free dynamic range (SFDR) at 5MHz, and ultra-low 85fs_RMS aperture jitter-enabling undersampling in cellular base station receivers and spectrum analyzers.

For engineers reviewing the LTC2217CUP#PBF datasheet, LTC2217CUP#PBF pinout, LTC2217CUP#PBF application, or LTC2217CUP#PBF equivalent, key selection criteria include its dual LVDS/CMOS output flexibility, internal clock duty cycle stabilizer, optional dither and data randomization, and compatibility with 3.3V single-supply operation across 0°C to 70°C industrial temperature range.

Technical Context

The LTC2217CUP#PBF employs a 16-bit pipelined ADC architecture with integrated sample-and-hold, correction logic, and programmable output formatting. Its analog front-end supports differential inputs with 1.575V common-mode bias (VCM), while the digital interface offers selectable output modes: standard LVDS, low-power LVDS, full-rate CMOS, or demultiplexed CMOS buses.

Timing control is managed via differential ENC+/ENC– encode inputs supporting PECL, LVDS, TTL, or CMOS clocks; an optional internal duty cycle stabilizer ensures performance stability across wide input duty cycles. The device integrates an internal 2.5V bandgap reference (selectable via SENSE pin) and supports external 1.25V/2.5V references for precision scaling.

Key Specifications

Pinout & Package

64-pin (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND). Requires soldering 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-105 and LTC2208IUP#PBF, the LTC2217CUP#PBF delivers superior SFDR and lower jitter in a parallel-output, pin-compatible form factor-making it optimal for FPGA-based wideband receivers needing deterministic timing and maximum analog performance without serial protocol overhead.

Availability

LTC2217CUP#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, test instrumentation, and defense communications requiring stable component supply across industrial temperature ranges (0°C to 70°C) and long production lifecycles.

Supply support for LTC2217CUP#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 industrial, automotive, communications, and healthcare markets.

The LTC2217CUP#PBF belongs to ADI's high-speed precision ADC product line, engineered for demanding RF and communications applications where wide bandwidth, low noise, and deterministic timing are non-negotiable.

FAQ

What is the operating temperature range for the LTC2217CUP#PBF?

The LTC2217CUP#PBF is rated for 0°C to 70°C ambient operation (C-grade), making it suitable for commercial and industrial environments where extended temperature tolerance is not required. This differs from the I-grade variant (LTC2217IUP#PBF), which operates from –40°C to 85°C. All DC and AC specifications in the datasheet marked with ● apply across this full C-grade range.

Does the LTC2217CUP#PBF support both LVDS and CMOS digital outputs simultaneously?

No-the LTC2217CUP#PBF supports only one output mode at a time, selected by the voltage applied to the LVDS pin (Pin 61). Applying VDD selects standard LVDS; 2/3VDD selects low-power LVDS; 1/3VDD selects demultiplexed CMOS; and 0V selects full-rate CMOS. The device does not enable concurrent LVDS and CMOS bus activation-output drivers are mutually exclusive per configuration.

How does the internal dither function improve performance in the LTC2217CUP#PBF?

When enabled via the DITH pin (Pin 20), the LTC2217CUP#PBF injects controlled noise into the ADC pipeline to randomize quantization error. This raises the noise floor slightly but dramatically improves SFDR-e.g., from 105dBFS to 115dBFS at –25dBFS input-by breaking up harmonic correlation. It is especially effective for low-amplitude, periodic signals like CW tones in spectrum analysis.

Can the LTC2217CUP#PBF be used with a single-ended clock input?

Yes-the ENC+ and ENC– inputs accept single-ended clocks when ENC– is AC-coupled to ground via a 0.1μF capacitor and ENC+ is driven with a sine wave, TTL, or CMOS signal referenced to the internal 1.6V bias. The datasheet confirms this configuration maintains full 105Msps performance and 85fs_RMS jitter, though differential drive is preferred for best noise immunity and SFDR.

What is the purpose of the RAND pin on the LTC2217CUP#PBF?

The RAND pin (Pin 63) enables digital output randomization: when asserted high, bits D1–D15 are XORed with D0 (LSB), producing scrambled output patterns. This reduces spectral energy at clock harmonics and lowers radiated EMI-critical for passing CISPR 32 Class B emissions tests in compact test equipment. The original data can be recovered by reapplying the same XOR operation at the receiver.