Analog Devices Inc. DC1339A

Overview

DC1339A from Analog Devices (formerly Linear Technology) is a demonstration circuit board designed to evaluate the LTC2302 - a low-noise, 500 kSPS, 12-bit successive-approximation ADC with SPI-compatible serial interface, unipolar/bipolar mode selection, and on-board reference support. It enables direct DC linearity and AC performance validation including SNR, THD, SINAD, and SFDR.

For engineers reviewing the DC1339A datasheet, DC1339A pinout, DC1339A application, or DC1339A equivalent, this board supports rapid evaluation of the LTC2302 in both lab environments (via DC590B QuikEval or DC890B Fast DAACS) and customer-specific signal acquisition systems requiring precision analog-to-digital conversion up to 40 MHz clock input.

Technical Context

The DC1339A implements a complete signal chain around the LTC2302, including LT1790ACS6-4.096 voltage reference, LT1761ES5-2.5/5 low-dropout regulators, and NC7SVU04/NC7SZ66 level-shifting buffers for SPI signal integrity. It supports dual evaluation paths: DC590B for static performance (peak-to-peak noise, INL/DNL), and DC890B for dynamic metrics under precise sampling control.

Jumper-configurable settings (JP3, JP4, JP5) allow hardware-level selection of input polarity (IN− grounded or biased to VREF/2), reference source (onboard 4.096 V or external), and unipolar/bipolar mode - all synchronized with Pscope or QuikEval software configuration. The 50 Ω-terminated J3 clock input requires ≤20 ps jitter for full AC performance.

Key Specifications

Availability

DC1339A is available at Aetrix Electronics and suitable for precision data acquisition, sensor signal conditioning, and test instrumentation applications requiring stable component supply and validated ADC evaluation infrastructure.

Supply support for DC1339A 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 technologies for precision measurement and control systems.

The DC1339A belongs to Linear Technology's Demonstration Circuit (DC) series, engineered specifically to accelerate design-in and performance validation of their precision data converter portfolio, especially SAR ADCs targeting industrial, medical, and automated test equipment.

FAQ

What is the primary function of the DC1339A?

The DC1339A is a dedicated evaluation platform for the LTC2302 12-bit, 500 kSPS SAR ADC. It provides a fully assembled, tested circuit enabling immediate characterization of DC accuracy (INL/DNL, noise) and AC performance (SNR, THD, SFDR) using either DC590B or DC890B host interfaces. The DC1339A itself contains no active signal processing logic - its role is strictly ADC evaluation and signal chain validation.

Which host interface boards are compatible with DC1339A?

The DC1339A is explicitly designed for use with two Analog Devices evaluation controllers: DC590B (QuikEval USB serial controller) and DC890B (USB High-Speed Data Collection Board). J4 connects to DC590B via 14-conductor ribbon cable; J2 connects to DC890B via edge connector. These interfaces are not interchangeable - J2 and J4 must not be used simultaneously, as stated in the hardware setup guide.

How do I configure the DC1339A for bipolar input mode?

To enable bipolar operation on the DC1339A, set JP3 to VREF/2 (not GND) and JP5 to UNI/GND (per Figure 2), then configure Pscope software for 12-bit bipolar mode. In QuikEval, right-click the range indicator and select bipolar. The LTC2302's IN− input is then biased to VREF/2, allowing ±2.048 V differential input range referenced to the 4.096 V reference.

Does DC1339A require an external power supply?

DC1339A requires external 6–9 V DC power only when used with DC890B, applied to the "6V–9VDC" and GND terminal posts. When connected to DC590B, power is delivered over the 14-conductor ribbon cable - no external supply is needed. JP1 allows OVDD voltage selection (5 V or external) to match SDO logic levels with the host interface.

Can DC1339A be integrated directly into a customer system?

Yes - the DC1339A is designed for both bench evaluation and in-circuit integration. Its J4 header exposes SPI signals (SDI, SDO, SCK, CONVST), power rails, and analog inputs (IN+, IN−), enabling direct connection to custom host controllers. The schematic (referenced in the Quick Start Guide) confirms signal routing and pin assignments for system-level interfacing without modification.