Analog Devices Inc. DC750A-A

Overview

DC750A-A from Analog Devices (formerly Linear Technology) is a demonstration circuit board designed to evaluate the LTC2220 12-bit, 170 MSPS high-speed LVDS-output analog-to-digital converter. It features optimized analog input conditioning for 1–100 MHz signals, 3.3 V supply operation with up to 500 mA draw, and supports parallel LVDS data output across 24 pins (12-bit format). The board enables rapid performance validation in RF receiver and communications test systems.

For engineers reviewing the DC750A-A datasheet, DC750A-A pinout, DC750A-A application, or DC750A-A equivalent, key considerations include its fixed LTC2220 integration, 1–100 MHz analog input bandwidth optimization, LVDS output interface compatibility with DC890B acquisition hardware, and jumper-configurable input range (1 V_PP or 2 V_PP) and output format (2's complement).

Technical Context

The DC750A-A implements a passive transformer-coupled analog front end using MA/COM ETC1-1T balun and 0402 RC network, tuned specifically for 1–100 MHz input frequencies. Its encode clock interface accepts 2–2.5 V_P-P sine or square wave inputs via 50 Ω source impedance and capacitive coupling.

LVDS data output conforms to FIN1108T buffer specifications: 1.2 V ±170 mV logic levels under 100 Ω termination, with outputs routed on J2 edge connector pins [8–46, 56–82] for full 12-bit parallel sampling. Power sequencing requires external +3.3 V applied before enabling OE and SHDN via JP1 and JP3 jumpers.

Key Specifications

Availability

DC750A-A is available at Aetrix Electronics and suitable for RF receiver evaluation, high-speed data acquisition system prototyping, and communications test equipment development requiring stable component supply and validated reference design support.

Supply support for DC750A-A 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) acquired Linear Technology in 2017 and maintains its high-performance signal chain portfolio, including precision and high-speed data converters.

The DC750A-A belongs to ADI's demonstration circuit series for high-speed ADCs, engineered to accelerate evaluation of LVDS-output, 10/12-bit, 135–185 MSPS converters in demanding RF and instrumentation applications.

FAQ

What ADC is installed on the DC750A-A demonstration board?

The DC750A-A comes factory-assembled with the LTC2220 - a 12-bit, 170 MSPS, LVDS-output analog-to-digital converter. This specific variant is permanently mounted and cannot be substituted in the field. The DC750A-A's analog front-end components, clock interface, and power delivery are all calibrated for optimal LTC2220 operation at 1–100 MHz input frequencies.

Does DC750A-A support both 1 V_PP and 2 V_PP analog input ranges?

Yes, DC750A-A supports selectable analog input full-scale ranges of 1 V_PP or 2 V_PP via jumper configuration. JP20–JP22 control the SENSE voltage: connecting to VCM selects 1 V_PP, while connecting to VDD selects 2 V_PP. This adjustment directly scales the ADC's effective input sensitivity without requiring external gain stages.

Can DC750A-A be used with the DC890B data acquisition board?

Yes, DC750A-A is fully compatible with the DC890B FastDAACS board when powered externally with 6 V/1 A. The DC890B enables LVDS mode only when external power is applied, and requires an encode clock >50 MHz to operate its FPGA DCM. DC750A-A's LVDS output pins map directly to the DC890B's high-speed connector, supporting seamless PScope software integration.

What is the recommended encode clock signal for DC750A-A?

The DC750A-A requires a low-jitter encode clock input of 2–2.5 V_P-P, delivered via SMA connector with 50 Ω source impedance and AC coupling. Sine or square wave forms are accepted. For best SNR/SFDR, Agilent 8664B generators with TTE bandpass filters are recommended - especially critical above 100 MHz where noise folding degrades baseband performance.

How is the analog input conditioned on DC750A-A?

DC750A-A uses a transformer-coupled front end centered on the MA/COM ETC1-1T 1:1 balun, followed by a 0402 RC network optimized for 1–100 MHz operation. This topology provides broadband impedance matching, common-mode rejection, and minimal group delay variation - essential for preserving dynamic performance of the LTC2220 during evaluation of narrowband or wideband RF signals.