Analog Devices Inc. DC1564A-C

Overview

DC1564A-C from Analog Devices (formerly Linear Technology) is a dual-channel, 14-bit, 250Msps high-speed analog-to-digital converter designed for RF-sampling signal chains in communications infrastructure. It delivers 70dB SNR, 90dB SFDR, and 1.25GHz full-power bandwidth with DDR LVDS outputs, operating from a single 1.8V supply. It serves as the digitization front-end in cellular basestations and software-defined radios.

For engineers reviewing the DC1564A-C datasheet, DC1564A-C pinout, DC1564A-C application, or DC1564A-C equivalent, this page provides verified functional context, validated pin-level circuit roles, confirmed dynamic performance at 250Msps, and real-world deployment constraints including clock duty cycle stabilization, sleep mode power (<5mW), and 64-pin QFN thermal management.

Technical Context

The DC1564A-C implements two independent pipelined ADC cores with simultaneous sampling, each featuring a 1.25GHz sample-and-hold amplifier and correction logic to achieve ±0.85LSB INL and ±0.25LSB DNL. Its architecture supports undersampling of IF/RF signals up to 907MHz while maintaining spurious-free performance.

Digital interface uses DDR LVDS with programmable 1.75mA/3.5mA output current per pair, internal 100Ω termination, and a dedicated CLKOUT for deterministic data capture timing. Configuration is handled via a 3-wire SPI port supporting readback, with parallel programming mode available via PAR/SER pin selection.

Key Specifications

Pinout & Package

DC1564A-C is housed in a 64-lead (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND). The package requires soldering the exposed pad to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 14-bit, high-speed ADC applications.

Compared with AD9680BCPZ-500 and LTC2268IUP-14#PBF, DC1564A-C uniquely balances 250Msps dual-channel performance, LVDS simplicity, sub-5mW sleep mode, and deterministic 6-cycle latency - making it optimal for compact, low-latency, thermally constrained RF digitizers where JESD204B overhead is unnecessary.

Availability

DC1564A-C is available at Aetrix Electronics and suitable for cellular basestation receiver modules, software-defined radio platforms, medical ultrasound beamformers, and high-speed automated test equipment requiring stable component supply across extended production lifecycles.

Supply support for DC1564A-C 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 acquired Linear Technology in 2017 and maintains its high-performance signal chain portfolio, emphasizing precision, speed, and integration for demanding analog applications.

The DC1564A-C belongs to Linear's LTC215x family of dual-channel, high-speed ADCs engineered specifically for RF-sampling architectures in wireless infrastructure, defense EW systems, and high-fidelity instrumentation.

FAQ

What is the maximum input frequency supported by DC1564A-C while maintaining specified SNR?

The DC1564A-C maintains 70dB SNR up to 140MHz input frequency at 250Msps sampling rate, as verified in the datasheet's dynamic accuracy table. At higher frequencies (e.g., 907MHz), SNR degrades to ~55dB due to aperture jitter and bandwidth roll-off, but SFDR remains ≥80dB - confirming usability for undersampling applications where spurious content must be controlled.

Does DC1564A-C support both internal and external voltage references?

Yes, DC1564A-C supports both reference modes. Connecting SENSE to VDD enables the internal 1.25V reference and ±0.75V input range. Applying 1.20V–1.30V to SENSE selects external reference mode with ±0.6 × VSENSE input range. VREF pin outputs the selected reference voltage and must be bypassed with a 2.2µF capacitor for stability.

How is clock jitter performance specified for DC1564A-C, and what impact does it have on SNR?

DC1564A-C specifies 0.15psRMS aperture jitter. At 250Msps, this translates to theoretical SNR limit of ~72.5dB - closely matching the measured 70dB typical SNR, confirming jitter is a dominant noise contributor. System-level SNR will degrade further if external clock jitter exceeds 0.1psRMS, especially above 100MHz input frequency.

Can DC1564A-C operate with a non-50% duty cycle encode clock?

Yes, DC1564A-C includes an optional clock duty cycle stabilizer (enabled via SPI or CS pin in parallel mode) that corrects encode clock duty cycles from 40% to 60%, ensuring full 250Msps performance without external clock conditioning. When disabled, minimum tL/tH is 1.9ns, requiring tighter duty cycle control.

What thermal management guidance applies to DC1564A-C in continuous 250Msps operation?

DC1564A-C has θJA = 20°C/W. With 650mW dissipation, junction temperature rise is ~13°C above ambient. The exposed pad (Pin 65) must be soldered to a solid PCB ground plane with ≥6 thermal vias (0.3mm diameter) to maintain TJ < 105°C at 85°C ambient - critical for long-term reliability in sealed basestation enclosures.