Analog Devices Inc. DC1564A-B

Overview

DC1564A-B from Analog Devices (formerly Linear Technology) is a dual-channel, 14-bit, 250Msps high-speed analog-to-digital converter with DDR LVDS outputs, 1.25GHz full-power bandwidth, 70dB SNR, and 90dB SFDR - designed for undersampling wideband RF signals in cellular basestations and software-defined radios.

For engineers reviewing the DC1564A-B datasheet, DC1564A-B pinout, DC1564A-B application, or DC1564A-B equivalent, this evaluation board enables rapid characterization of the LTC2157-14 ADC under real-world clocking, analog input drive, and digital interface conditions - including SPI configuration, duty-cycle stabilization, and low-power nap/sleep mode validation.

Technical Context

The DC1564A-B is an evaluation platform for the LTC2157-14, a pipelined 14-bit dual ADC featuring simultaneous sampling, a 1.25GHz S/H front-end, and programmable 1.75mA/3.5mA DDR LVDS output drivers. It supports differential sine-wave, PECL, LVDS, TTL, or CMOS clock inputs and includes an optional clock duty cycle stabilizer.

It implements full SPI register access via CS/SCK/SDI/SDO for configuring sample rate modes, power states (sleep/nap), output current, and clock phase alignment. The board routes all 64 pins of the 9mm × 9mm QFN package to accessible test points and connectors, preserving signal integrity for high-frequency analog and LVDS paths.

Key Specifications

Availability

DC1564A-B is available at Aetrix Electronics and suitable for RF receiver design, high-speed data acquisition, and communications test equipment requiring stable component supply and validated reference hardware.

Supply support for DC1564A-B 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The DC1564A-B belongs to Analog Devices' precision high-speed ADC evaluation platform family, engineered to accelerate time-to-validation for RF-sampling and wideband digitization applications in defense, telecom, and instrumentation.

FAQ

What is the primary function of the DC1564A-B evaluation board?

The DC1564A-B evaluation board is a fully featured platform for evaluating the LTC2157-14 dual 14-bit 250Msps ADC. It provides complete signal chain support - including clock conditioning, differential analog input drive via baluns, DDR LVDS output termination, and SPI-based register configuration - enabling engineers to validate AC performance (SNR, SFDR), timing behavior, and low-power modes without custom PCB development. The DC1564A-B directly interfaces with Analog Devices' Linduino system for script-driven testing.

Does the DC1564A-B support both internal and external clock sources for the LTC2157-14?

Yes, the DC1564A-B supports both internal and external clocking of the LTC2157-14. It includes an on-board crystal oscillator for standalone evaluation and provisions for external clock injection via SMA connector. Clock signals are conditioned through a dedicated buffer stage to meet ENC+/ENC– input requirements (differential voltage, common-mode range, jitter tolerance), and the board's jumpers allow selection between clock sources and enable/disable of the optional duty cycle stabilizer - critical for maintaining performance across varying input clock duty cycles. This flexibility is integral to DC1564A-B's utility in RF undersampling scenarios.

Can the DC1564A-B be used to evaluate power consumption in sleep and nap modes?

Yes, the DC1564A-B enables accurate measurement and validation of the LTC2157-14's low-power states. It provides dedicated test points for analog (VDD) and digital (OVDD) supply currents, along with SPI-accessible control of sleep mode (clock disabled, <5mW) and nap mode (clocked at max rate, 213mW). The board's layout isolates power domains and includes sense resistors compatible with standard multimeters or current probes, allowing engineers to correlate register settings (via DC1564A-B's Linduino interface) with real-world power draw - essential for battery-powered or thermally constrained systems using the DC1564A-B.

How does the DC1564A-B handle analog input signal conditioning for the LTC2157-14?

The DC1564A-B uses high-performance miniature baluns to convert single-ended test signals (from SMA input) into the precise differential 1.5VP-P, 1.25GHz-bandwidth analog inputs required by the LTC2157-14. Input paths include DC-blocking capacitors, impedance-matched 50Ω traces, and adjustable common-mode bias via the VCM output. The board also supports direct differential drive via edge-mount connectors, preserving signal integrity for lab-grade measurements. All analog routing adheres to strict length matching and ground shielding - a core design feature of the DC1564A-B that ensures valid ENOB and SFDR validation per the LTC2157-14 datasheet.

Is the DC1564A-B compatible with other members of the LTC215X-14 family?

Yes, the DC1564A-B is mechanically and electrically compatible with the entire LTC215X-14 family (LTC2157-14, LTC2156-14, LTC2155-14), as all share the identical 64-pin 9mm × 9mm QFN package and pinout. While the board is optimized for the 250Msps LTC2157-14, it supports drop-in replacement of LTC2156-14 (210Msps) and LTC2155-14 (170Msps) without hardware modification. Firmware and configuration scripts must be adjusted for sample rate-specific timing and power parameters - a capability natively supported by the DC1564A-B's Linduino software stack.