Analog Devices Inc. AD9243ASZ

Overview

AD9243ASZ from Analog Devices is a monolithic 14-bit, 3.0 MSPS analog-to-digital converter (ADC) with integrated sample-and-hold amplifier and programmable voltage reference. It operates on a single +5 V supply, delivers 79.0 dB SNR+D at 500 kHz input, exhibits ±0.6 LSB differential nonlinearity, and features straight-binary output for direct interface to FPGA or DSP in high-fidelity data acquisition systems.

For engineers reviewing the AD9243ASZ datasheet, AD9243ASZ pinout, AD9243ASZ application, or AD9243ASZ equivalent, this page provides verified technical context, confirmed DC/AC specifications, validated 44-lead MQFP package mapping, functional pin definitions, and two rigorously cross-checked alternative ADCs for signal chain design continuity.

Technical Context

The AD9243ASZ employs a four-stage differential pipelined architecture with digital error correction logic to guarantee no missing codes across –40°C to +85°C. Its SHA supports both single-ended and differential inputs, with configurable 2 V or 5 V p-p spans referenced to internal 1 V or 2.5 V voltage sources.

It uses a single rising-edge-triggered clock for sampling, exhibits 3-clock-cycle pipeline latency, and provides separate analog (AVDD/AVSS), digital (DVDD/DVSS), and output driver (DRVDD/DRVSS) supplies to isolate noise domains. The OTR signal flags overflow conditions independently of MSB polarity.

Key Specifications

Pinout & Package

AD9243ASZ is housed in a 44-lead Metric Quad Flatpack (MQFP), RoHS-compliant, with 0.8 mm lead pitch and exposed thermal pad (not electrically connected). Package dimensions: 10 mm × 10 mm × 1.75 mm (max height).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit, 3 MSPS ADC applications.

Compared with AD9243ASZ, AD9240ARSZ trades lower power and simpler layout for significantly higher throughput but lacks OTR and requires reference reconfiguration, while ADS8325IPFBT offers superior DC accuracy and lower power at the cost of 30× slower speed and incompatible interface - making AD9243ASZ optimal for balanced AC performance, integration, and thermal efficiency in mid-speed instrumentation.

Availability

AD9243ASZ is available at Aetrix Electronics and suitable for medical ultrasound imaging, communications baseband digitization, industrial data acquisition, test & measurement equipment, and high-fidelity signal analysis requiring stable component supply and long-term lifecycle support.

Supply support for AD9243ASZ 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD9243ASZ belongs to Analog Devices' high-speed precision ADC product line, designed specifically for applications demanding 14-bit resolution at multi-MSPS rates with integrated analog front-end functionality and robust thermal performance.

FAQ

What is the maximum input frequency the AD9243ASZ can accurately digitize?

The AD9243ASZ has a full-power bandwidth of 40 MHz and a specified Nyquist frequency of 1.5 MHz at its 3.0 MSPS sampling rate. While it can accept input signals beyond 1.5 MHz, its AC performance (e.g., SINAD, SFDR) degrades above that point. For optimal fidelity, keep input frequencies ≤1.5 MHz; the 40 MHz bandwidth ensures minimal amplitude loss and phase distortion within that band. The AD9243ASZ datasheet confirms 77.0 dB SINAD at 1.5 MHz input.

Does the AD9243ASZ require an external voltage reference?

No, the AD9243ASZ includes a fully integrated, programmable voltage reference delivering either 1.0 V or 2.5 V with ±35 mV tolerance. External reference is optional and only needed when tighter initial accuracy or lower temperature drift than the internal reference provides is required. The SENSE pin selects the mode, and REFCOM sets the common-mode level - all functions are self-contained within the AD9243ASZ.

Can the AD9243ASZ operate with a 3.3 V digital supply?

The AD9243ASZ's core digital logic (DVDD) and analog supplies (AVDD) require +5 V ±5%, but its output drivers support 3.3 V operation via the independent DRVDD pin. When DRVDD = 3.3 V, VOH is ≥2.4 V and VOL is ≤0.7 V, meeting standard 3.3 V CMOS thresholds. This allows direct interfacing to 3.3 V FPGAs or processors without level shifters - a key feature confirmed in the AD9243ASZ digital specifications table.

How does the OTR (Out-of-Range) signal function in the AD9243ASZ?

The OTR signal on Pin 25 is an active-high, asynchronous flag indicating analog input has exceeded ±VREF. It asserts before the corresponding conversion result appears at the output bus and remains valid for the duration of the overflow condition. Used with BIT 1 (MSB), OTR distinguishes between high overflow (+VREF + ε) and low overflow (–VREF – ε). This real-time saturation detection is critical for automatic gain control loops and fault monitoring in the AD9243ASZ-based systems.

What is the thermal resistance of the AD9243ASZ in its MQFP package?

The AD9243ASZ in the 44-lead MQFP package has a junction-to-ambient thermal resistance (θJA) of 53.2°C/W and junction-to-case (θJC) of 19°C/W, per the manufacturer's thermal characteristics table. At its typical 110 mW power dissipation, this results in a ~5.8°C junction-to-ambient temperature rise above ambient - well within safe operating limits for most PCB layouts without forced air cooling. These values are measured under standard JEDEC conditions and apply directly to the AD9243ASZ.