Analog Devices Inc. DC1564A-F

Overview

DC1564A-F from Analog Devices (formerly Linear Technology) is a high-speed dual 12-bit analog-to-digital converter evaluation board designed to demonstrate the LTC2157-12, a 250Msps ADC with 68.5dB SNR, 90dB SFDR, 1.25GHz full-power bandwidth, DDR LVDS outputs, and single 1.8V supply operation - used in cellular basestations and software-defined radios.

For engineers reviewing the DC1564A-F datasheet, DC1564A-F pinout, DC1564A-F application, or DC1564A-F equivalent, this page provides verified functional context, layout-validated interface behavior, power delivery requirements, clocking architecture details, and real-world FFT performance data for undersampling RF signal chains.

Technical Context

The DC1564A-F implements a complete signal chain around the LTC2157-12, including transformer-coupled differential analog inputs, programmable clock conditioning (ENC+/ENC–), on-board 1.8V LDOs for VDD/OVDD, and impedance-matched DDR LVDS output routing to SMA connectors. It supports both serial SPI and parallel programming modes via PAR/SER selection.

Board-level features include adjustable input common-mode bias (VCM), external reference configuration (SENSE pin), optional clock duty cycle stabilizer control (CS), and low-power Nap/Sleep mode entry via SCK - all accessible through header pins and jumpers for system-level timing validation.

Key Specifications

Availability

DC1564A-F is available at Aetrix Electronics and suitable for cellular basestation development, software-defined radio prototyping, and high-definition video digitization requiring stable component supply and validated reference design support.

Supply support for DC1564A-F 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-F belongs to Analog Devices' precision high-speed ADC evaluation platform family, engineered to accelerate time-to-prototype for RF sampling, communications infrastructure, and test instrumentation applications.

FAQ

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

The DC1564A-F evaluation board is designed exclusively to evaluate the LTC2157-12 dual 12-bit 250Msps analog-to-digital converter. It provides fully routed signal paths, calibrated power delivery, and accessible control interfaces to validate dynamic performance (SNR, SFDR), timing behavior, and system integration - not as a standalone product but as a hardware reference for ADC characterization and firmware development. The DC1564A-F enables rapid validation of undersampled RF signals up to 900MHz.

Does the DC1564A-F support both serial and parallel configuration modes for the LTC2157-12?

Yes, the DC1564A-F supports both serial and parallel configuration modes for the LTC2157-12 via the PAR/SER jumper. In serial mode (PAR/SER = GND), CS, SCK, SDI, and SDO operate as a standard SPI interface for full register access. In parallel mode (PAR/SER = VDD), CS controls the clock duty cycle stabilizer, SCK enters Sleep mode, and SDI selects LVDS output current - enabling fast hardware-based setup without host processor intervention. This dual-mode flexibility is implemented and verified on the DC1564A-F board layout.

What analog input coupling method does the DC1564A-F use, and what is its usable frequency range?

The DC1564A-F uses transformer-coupled differential analog inputs with 1:1 baluns, supporting AC-coupled signals from 10MHz to 900MHz. The input network is impedance-matched to 50Ω and optimized for the LTC2157-12's 1.5VP-P differential range and 1.25GHz full-power bandwidth. Measured performance confirms <0.5dB gain flatness from 70MHz to 500MHz and validated undersampling capability at 907MHz - all demonstrated using the DC1564A-F hardware.

How is clock signal integrity maintained on the DC1564A-F for the LTC2157-12?

The DC1564A-F maintains clock signal integrity for the LTC2157-12 via a dedicated SMA input routed directly to ENC+/ENC– with controlled 50Ω differential impedance, minimal stub length, and adjacent ground vias. On-board 0.1µF ceramic decoupling is placed within 2mm of each ENC pin. The board also supports optional clock duty cycle stabilization (enabled via CS in parallel mode), which is electrically validated on the DC1564A-F to preserve aperture jitter below 0.15psRMS at 250Msps.

Can the DC1564A-F be used to evaluate power consumption in Nap and Sleep modes?

Yes, the DC1564A-F provides direct test points and jumper-controlled enable paths for both Nap and Sleep modes of the LTC2157-12. Nap mode (181mW at 250Msps) is activated by asserting SCK while clock is running; Sleep mode (<5mW) is entered by disabling the encode clock - both states are measurable using the onboard VDD/OVDD current sense resistors and documented in the DC1564A-F user guide. Power states are confirmed functional on the DC1564A-F board.