Analog Devices Inc. LTC2208CUP#PBF

Overview

LTC2208CUP#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 130Msps analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization up to 700MHz full-power bandwidth. It features a programmable gain amplifier (PGA), 70fs RMS jitter, 78dBFS noise floor, and ±4LSB INL. Used in cellular base station receivers requiring undersampling of RF signals with low spurious content.

For engineers reviewing the LTC2208CUP#PBF datasheet, LTC2208CUP#PBF pinout, LTC2208CUP#PBF application, or LTC2208CUP#PBF equivalent, key selection criteria include SFDR >100dBc at 5MHz, LVDS/CMOS output flexibility, internal dither support, clock duty cycle stabilization, and 64-pin QFN thermal performance at 1.25W dissipation.

Technical Context

The LTC2208CUP#PBF employs a 16-bit pipelined ADC core with integrated sample-and-hold and PGA front end, enabling dual input ranges (1.5VP-P or 2.25VP-P). Its ultra-low 70fsRMS aperture jitter supports high-fidelity undersampling of IF/RF signals up to 250MHz while maintaining >83dB SFDR.

Digital outputs are configurable as differential LVDS (standard or low-power), single-ended CMOS (full-rate or demultiplexed), with separate OVDD supply (0.5V–3.6V) and mode-select pins (LVDS, MODE, RAND) for real-time interface adaptation. Clock inputs accept PECL, LVDS, TTL, or CMOS, with optional duty cycle stabilizer for robust timing at full speed.

Key Specifications

Pinout & Package

Package: 64-lead (9mm × 9mm) plastic QFN with exposed thermal pad (Pin 65 = GND), θ_JA = 20°C/W. Requires PCB soldering of exposed pad for thermal compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9268BCPZ-125 and LTC2207IUP#PBF, the LTC2208CUP#PBF uniquely balances 130Msps throughput, 100dB SFDR at RF frequencies, and flexible LVDS/CMOS output drive-making it optimal for wideband communications and real-time spectrum analysis where both speed and spur suppression are critical.

Availability

LTC2208CUP#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, test equipment, medical ultrasound, and defense radar systems requiring stable component supply across production lifecycles.

Supply support for LTC2208CUP#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 communications, industrial, automotive, and healthcare markets.

The LTC2208CUP#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding RF/IF digitization in wireless infrastructure and instrumentation where jitter, linearity, and thermal stability are non-negotiable.

FAQ

What is the operating temperature range for the LTC2208CUP#PBF?

The LTC2208CUP#PBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is confirmed by the "C" suffix in the part number and the Absolute Maximum Ratings table specifying LTC2208C temperature range. The device uses internal thermal protection and requires proper PCB thermal pad soldering to maintain performance within this range.

Does the LTC2208CUP#PBF support both LVDS and CMOS digital outputs?

Yes, the LTC2208CUP#PBF supports LVDS (standard and low-power modes) and CMOS (full-rate or demultiplexed) outputs. Output mode is selected via the LVDS pin voltage (0V, 1/3VDD, 2/3VDD, or VDD). CMOS output swing is adjustable from 0.5V to 3.6V using the OVDD supply, enabling direct interfacing with diverse FPGA I/O standards without level shifters.

How does the PGA pin affect input range and system performance in the LTC2208CUP#PBF?

The PGA pin on the LTC2208CUP#PBF selects between two differential input ranges: low (2.25VP-P, PGA = low) for higher signal headroom, or high gain (1.5VP-P, PGA = high) for improved SNR with smaller signals. This allows optimization of dynamic range versus quantization noise depending on the analog source, directly impacting effective number of bits (ENOB) in applications like spectrum analysis.

What is the purpose of the SENSE pin on the LTC2208CUP#PBF?

On the LTC2208CUP#PBF, the SENSE pin selects the reference configuration: tied to VDD enables the internal 2.5V bandgap reference, while external 2.5V or 1.25V references can be applied for improved stability or system-level reference synchronization. Both configurations yield a 2.25VP-P full-scale range when PGA = 0, ensuring consistent scaling across reference choices.

Can the LTC2208CUP#PBF be used with a single-ended clock input?

Yes, the LTC2208CUP#PBF accepts single-ended clock inputs on ENC+ or ENC–, with the complementary pin AC-coupled to 1.6V (via 0.1μF capacitor) as specified in the Pin Functions section. Internal 6.2kΩ bias resistors set the common-mode point, allowing compatibility with TTL, CMOS, or sine-wave sources without external bias networks.