Analog Devices Inc. DC1082A-A

Overview

DC1082A-A from Analog Devices (formerly Linear Technology) is a 14-bit, 3Msps simultaneous-sampling dual-channel ADC with differential inputs, 80dB CMRR at 100kHz, 1.5Msps per channel throughput, and 10μW Sleep shutdown mode. It operates from a single 3V supply in a 10-lead MSOP package and targets high-speed portable data acquisition where timing coherence and low power are critical.

For engineers reviewing the DC1082A-A datasheet, DC1082A-A pinout, DC1082A-A application, or DC1082A-A equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in multiphase motor control and I/Q demodulation, and two confirmed alternative parts with documented technical and application differences.

Technical Context

The DC1082A-A implements two independent sample-and-hold circuits triggered simultaneously on the rising edge of CONV, enabling true time-aligned sampling across CH0 and CH1. Each channel converts at 1.5Msps using a successive-approximation architecture with internal 2.5V bandgap reference.

It features a 3-wire serial interface (SCK, CONV, SDO) with 32-clock output framing for both 14-bit words, supports external reference overdrive (2.55V–VDD), and achieves 72.0dB SINAD at 100kHz with 50MHz full-power bandwidth - all while maintaining ≤200ps aperture skew between channels.

Key Specifications

Pinout & Package

DC1082A-A is housed in a 10-lead plastic MSOP (MSE) package with exposed pad (Pin 11) tied to GND. The package measures 3mm × 3mm × 0.85mm and requires soldering of the exposed pad to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel simultaneous-sampling ADC applications.

Compared with DC1082A-A, ADS8860IDRCT trades simultaneous sampling for higher resolution and lower voltage operation, while AD7903BRUZ provides true 16-bit dual-channel sync at reduced speed and larger footprint - making DC1082A-A optimal for compact, battery-powered 14-bit systems demanding 1.5Msps/channel timing coherence.

Availability

DC1082A-A is available at Aetrix Electronics and suitable for multiphase motor control, I/Q demodulation, and portable data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for DC1082A-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) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The DC1082A-A belongs to ADI's precision data acquisition portfolio, designed specifically for applications demanding time-aligned dual-channel sampling, low power, and robust noise immunity in space-constrained environments.

FAQ

What is the maximum input frequency supported by DC1082A-A while maintaining specified dynamic performance?

DC1082A-A maintains 72.0dB SINAD and –85dB THD up to 100kHz input frequency with internal 2.5V reference. Its full-power bandwidth is 50MHz, meaning it can digitize signals up to that frequency with –3dB amplitude response, but dynamic specs degrade above 100kHz due to aperture jitter and noise floor limitations. For 750kHz inputs, SINAD drops to 70.5dB, confirming its suitability for undersampled RF applications with appropriate anti-alias filtering.

Does DC1082A-A support external reference voltages, and what are the valid voltage ranges?

Yes, DC1082A-A supports external reference voltages applied to the VREF pin (Pin 3). The valid range is 2.55V to VDD (max 3.6V), with recommended operation at 3.3V when VDD ≥ 3.3V. External references improve accuracy and enable input spans beyond 2.5V - for example, a 3.3V reference yields 1LSB = 201μV and extends usable differential range to 0–3.3V, directly increasing measurement resolution in high-voltage sensing applications.

How does the Sleep mode of DC1082A-A function, and what is the wake-up latency?

DC1082A-A enters Sleep mode after four or more CONV pulses while SCK is held static (high or low). In Sleep mode, power drops to 10μW and internal circuitry powers down, including the reference amplifier. Wake-up requires one SCK pulse followed by a 2ms VREF settling time (per datasheet Note 14) before valid conversions resume. This makes DC1082A-A ideal for burst-mode acquisition where microsecond-level wake latency is acceptable but nanowatt standby is critical.

Can DC1082A-A be used with single-ended input signals, and how does that affect performance?

Yes, DC1082A-A accepts single-ended inputs by grounding either CH0– or CH1–, converting the voltage at CH0+ or CH1+ relative to GND. However, doing so sacrifices 80dB CMRR, exposing the signal to ground noise and reducing effective SNR. Integral linearity remains unchanged, but offset error increases due to common-mode dependence. For best results in noisy environments, differential drive is strongly recommended - or use an external driver like LT1632 to convert single-ended sources to differential pairs before DC1082A-A inputs.

What is the significance of the 200ps aperture skew specification for DC1082A-A?

The 200ps aperture skew between CH0 and CH1 defines the maximum timing mismatch in sampling instants across the two channels. At 1MHz signal frequency, this corresponds to <0.1° phase error - essential for accurate vector calculations in motor control and complex baseband signal reconstruction in I/Q demodulation. Unlike interleaved or sequentially sampled dual ADCs, DC1082A-A achieves this via dedicated, matched sample-and-hold circuits triggered by a single CONV edge, eliminating software or FPGA-based skew compensation.