Analog Devices Inc. DC1565A-G

Overview

LTC2153-14 from Analog Devices (formerly Linear Technology) is a 14-bit, 310Msps pipeline analog-to-digital converter optimized for high-frequency undersampling in communications and instrumentation systems. It delivers 68.8dBFS SNR, 88dB SFDR at 70MHz input, and 1.25GHz full-power bandwidth with single 1.8V supply operation. Its DDR LVDS outputs and SPI-configurable clock duty cycle stabilizer support demanding SDR and medical imaging front-ends.

For engineers reviewing the LTC2153-14 datasheet, LTC2153-14 pinout, LTC2153-14 application, or LTC2153-14 equivalent, key selection criteria include its 310Msps sampling rate, 1.32V_P-P differential input range, 6-cycle pipeline latency, DDR LVDS output current programmability (1.75–4.5mA), and support for internal/external reference modes via SENSE pin configuration.

Technical Context

The LTC2153-14 employs a 14-bit pipelined ADC architecture with integrated sample-and-hold (S/H) featuring 1.25GHz full-power bandwidth and 0.15ps_RMS acquisition jitter. Its digital interface uses double-data-rate LVDS outputs with programmable drive current and optional on-chip 100Ω termination per pair.

Configuration is handled via a 3-wire SPI port supporting register reads/writes for mode control, including clock duty cycle stabilization, CLKOUT phase shifting (0°/45°/90°/135°), LVDS current selection, data format (offset binary/2's complement), and digital output randomization to suppress spectral spurs.

Key Specifications

Pinout & Package

40-lead (6mm × 6mm) plastic QFN package with exposed thermal pad (Pin 41 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9643BCPZ-250 and LTC2263IUJ-14#PBF, the LTC2153-14 uniquely balances 310Msps sampling, DDR LVDS simplicity, and SPI configurability - making it optimal for FPGA-centric designs needing deterministic timing, moderate pin count, and flexible clock/data alignment without JESD204B complexity.

Availability

LTC2153-14 is available at Aetrix Electronics and suitable for cellular basestation development, software-defined radio prototyping, and high-definition video test equipment requiring stable component supply and long-term production continuity.

Supply support for LTC2153-14 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 aerospace, communications, industrial, and healthcare markets.

The LTC2153-14 belongs to ADI's high-speed precision ADC product line, designed specifically for wideband undersampling applications where AC performance, low latency, and flexible digital interfacing are critical - such as next-generation wireless infrastructure and portable diagnostic instruments.

FAQ

What is the maximum sampling rate supported by the LTC2153-14?

The LTC2153-14 supports a maximum sampling rate of 310Msps, verified across temperature and voltage ranges per its Absolute Maximum Ratings and Dynamic Accuracy specifications. This rate is achievable with proper layout, 1.8V supplies, and differential encode clock drive meeting t_L/t_H timing requirements. Operation above 310Msps is not characterized and may result in degraded SNR or missing codes.

Does the LTC2153-14 require an external reference voltage?

No - the LTC2153-14 includes an internal 1.25V reference. When SENSE is tied to VDD, the device uses this internal reference to establish a ±0.66V (1.32V_P-P) input range. An external 1.23–1.27V reference applied to SENSE enables scaling of the input range to ±0.528×V_SENSE, providing flexibility for custom full-scale definitions without external reference ICs.

How does the clock duty cycle stabilizer function in the LTC2153-14?

The LTC2153-14 clock duty cycle stabilizer accepts encode inputs with duty cycles from 30% to 70% and generates an internal 50% clock for sampling. Enabled via SPI Register A2 or CS pin in parallel mode, it eliminates sensitivity to clock source asymmetry - allowing use of non-50% clocks from synthesizers or PLLs without external duty cycle correction circuitry.

What is the purpose of the digital output randomizer feature in the LTC2153-14?

The digital output randomizer in the LTC2153-14 applies XOR-based scrambling to data bits (excluding LSB, OF, and CLKOUT) to break up deterministic spectral tones caused by digital switching noise coupling into analog sections. Enabled via SPI Register A4, it reduces spurious content in FFT spectra - particularly valuable in sensitive receiver applications where digital feedthrough degrades SFDR.

Can the LTC2153-14 interface directly with Xilinx or Intel FPGAs?

Yes - the LTC2153-14's DDR LVDS outputs are compatible with Xilinx UltraScale+ and Intel Agilex FPGA I/O banks configured for LVDS_25 or LVDS_18 standards. Its programmable CLKOUT phase shift (0°/45°/90°/135°) and 6-cycle deterministic latency simplify timing closure. External 100Ω termination is recommended unless on-chip termination is enabled via SPI Register A3.