Analog Devices Inc. DC854D-J

Overview

LTC2216 from Analog Devices (formerly Linear Technology) is a 16-bit, 80Msps analog-to-digital converter optimized for high-frequency signal digitization in communications and instrumentation systems. It features 81.5dBFS noise floor, 100dB spurious-free dynamic range (SFDR), 85fsRMS aperture jitter, and 400MHz full-power bandwidth - enabling undersampling of RF signals up to 140MHz in cellular base station receivers and spectrum analyzers.

For engineers reviewing the LTC2216 datasheet, LTC2216 pinout, LTC2216 application, or LTC2216 equivalent, key selection considerations include its dual LVDS/CMOS output interface, internal/external reference flexibility via SENSE pin, clock duty cycle stabilizer support, and compatibility with high-speed data acquisition architectures requiring low-noise, wide-bandwidth ADCs.

Technical Context

The LTC2216 employs a 16-bit pipelined ADC core with integrated sample-and-hold, internal 2.5V bandgap reference (selectable via SENSE pin), and programmable dither/randomizer functions. Its analog input stage supports differential 2.75VP-P range with 1.575V common-mode bias (VCM pin) and exhibits 80dB CMRR across 1.2V–1.8V common-mode voltage.

Digital outputs are configurable as standard or low-power LVDS (100Ω load) or single-ended CMOS (0.5V–3.6V OVDD), with optional demultiplexed dual-bus (DA/DB) mode reducing output data rate by half. Timing is synchronized to ENC+/ENC– differential clock inputs, supporting sine wave, PECL, LVDS, TTL, or CMOS drive with ±0.6ns DATA-to-CLKOUT skew tolerance.

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-80 and LTC2217IUP#PBF, the LTC2216 offers optimal balance of parallel interface simplicity, integrated dither for low-level SFDR, and proven thermal stability in industrial temperature grades - making it preferred for cost-sensitive, high-reliability parallel-data acquisition designs.

Availability

LTC2216 is available at Aetrix Electronics and suitable for cellular infrastructure, test equipment, spectrum monitoring, and medical imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2216 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 LTC2216 belongs to ADI's high-speed precision ADC product line, engineered for demanding RF/IF digitization where low jitter, high SFDR, and flexible interface options are essential in wireless infrastructure and automated test systems.

FAQ

What is the maximum input frequency supported by the LTC2216 without aliasing?

The LTC2216 has a 400MHz full-power bandwidth and 80Msps sampling rate, allowing it to directly sample input frequencies up to 140MHz in undersampling configurations while maintaining >95dB SFDR. For Nyquist-limited baseband applications, the maximum unaliased input is 40MHz. The device's wide analog bandwidth and low aperture jitter make it suitable for IF sampling in communications receivers where aliasing is intentionally managed via front-end filtering.

Does the LTC2216 require an external reference, or does it have an internal one?

The LTC2216 includes an internal 2.5V bandgap reference and supports external references of 2.5V or 1.25V - all yielding a fixed 2.75VP-P full-scale input range. The SENSE pin selects the reference source: tied to VDD enables the internal reference; driven with an external voltage activates external reference mode. No external reference is required for standard operation, simplifying system design and reducing BOM count.

Can the LTC2216 operate with a 2.5V digital supply (OVDD) while using a 3.3V analog supply (VDD)?

Yes, the LTC2216 supports independent analog (VDD = 3.135V–3.465V) and digital output (OVDD = 0.5V–3.6V) supplies. At OVDD = 2.5V, CMOS outputs deliver VOH ≈ 2.49V and VOL ≈ 0.1V under specified loads, enabling interoperability with 2.5V logic families. This rail separation allows optimization of noise isolation and power efficiency without compromising analog performance.

How does the internal dither function improve performance in the LTC2216?

The LTC2216's internal dither adds controlled noise to the analog input path before quantization, breaking up harmonic correlation and improving SFDR by ≥10dB at low input levels (e.g., –25dBFS). When enabled via the DITH pin, it raises SFDR from 105dB to 115dB at 5MHz - critical for detecting weak signals near strong interferers in spectrum analysis and radar applications. Dither is disabled by default and activated only when needed.

Is the LTC2216 pin-compatible with other members of the LTC22xx family?

Yes, the LTC2216 is pin-compatible with the LTC2208 (14-bit, 40Msps) and LTC2217 (16-bit, 105Msps) in the same 64-pin QFN package. This allows hardware reuse across performance tiers - for example, upgrading from LTC2208 to LTC2216 for higher resolution or to LTC2217 for higher speed - without PCB layout changes, reducing development time and qualification effort for scalable ADC platforms.