Analog Devices Inc. AD9243ASZRL

Overview

AD9243ASZRL from Analog Devices is a monolithic 14-bit, 3.0 MSPS analog-to-digital converter (ADC) with on-chip sample-and-hold amplifier and programmable voltage reference. It operates from 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 with out-of-range (OTR) flag-used in high-fidelity data acquisition and communications IF sampling systems.

For engineers reviewing the AD9243ASZRL datasheet, AD9243ASZRL pinout, AD9243ASZRL application, or AD9243ASZRL equivalent, this page provides verified technical context, package-validated pin functions, real-world AC/DC performance boundaries, and two confirmed alternative ADCs for 14-bit, ~3 MSPS sampling applications requiring low power and integrated reference.

Technical Context

The AD9243ASZRL employs a 4-stage differential pipelined architecture with digital error correction logic to guarantee no missing codes across –40°C to +85°C. Its sample-and-hold supports both single-ended and differential inputs, configurable for 2 V or 5 V p-p spans using internal 1 V or 2.5 V references.

Internal MDAC stages (gains of 8, 8, and 16) enable high-speed conversion with 3-clock-cycle pipeline latency. Digital outputs are CMOS-compatible and configurable for +3 V or +5 V logic levels via DRVDD, while aperture jitter is specified at 4 ps rms-critical for undersampling and direct-IF receiver designs.

Key Specifications

Pinout & Package

AD9243ASZRL is housed in a 44-lead Metric Quad Flatpack (MQFP), RoHS-compliant, with 0.8 mm lead pitch and exposed thermal pad. Package thermal resistance θ_JA = 53.2°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit, ~3 MSPS analog-to-digital conversion applications.

Compared with AD9243ASZRL, AD9240ASTZRL trades power efficiency for speed while retaining pin compatibility, whereas ADS8325IPFBT sacrifices throughput for resolution and DC stability-making AD9243ASZRL the optimal balance for medium-speed, low-power, integrated-reference applications.

Availability

AD9243ASZRL is available at Aetrix Electronics and suitable for medical ultrasound imaging, communications direct-IF receivers, and industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD9243ASZRL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The AD9243ASZRL belongs to Analog Devices' precision high-speed ADC product line, designed specifically for applications demanding 14-bit resolution at multi-MSPS rates with minimal external components and robust thermal performance.

FAQ

What is the maximum recommended clock jitter for optimal performance of the AD9243ASZRL?

The AD9243ASZRL specifies 4 ps rms aperture jitter, which directly limits achievable SNR. To maintain ≥79.0 dB SINAD at 500 kHz input, the total clock jitter-including source, PCB routing, and termination effects-must remain ≤3 ps rms. Exceeding this degrades SFDR and introduces spurious tones; use low-phase-noise oscillators and controlled-impedance clock traces with proper termination to meet this requirement. The AD9243ASZRL's performance validation assumes this jitter budget is respected.

Can the AD9243ASZRL operate with an external reference, and what are the interface requirements?

Yes, the AD9243ASZRL supports external reference operation via the VREF and REFCOM pins. When using an external reference, SENSE must be tied to AVSS to disable the internal reference. The external reference must be low-noise (<10 µV rms), capable of sourcing/sinking ≥1 mA, and stable within ±0.01% over temperature. Input impedance at VREF is 5 kΩ typical; driving it directly from a precision DAC or REF5025 is acceptable, but buffer amplification is recommended for low-impedance drive and noise isolation. This configuration is used in the AD9243ASZRL when highest dc accuracy is required.

How does the AD9243ASZRL handle overvoltage conditions on its analog inputs?

The AD9243ASZRL tolerates analog input voltages from AVSS –0.3 V to AVDD +0.3 V per Absolute Maximum Ratings. For overvoltage recovery, it specifies 167 ns to regain 0.0025% accuracy after a 50% full-scale overvoltage event. During overrange, the OTR pin asserts high, and output data reflects saturated code (all 1s or all 0s depending on polarity). Recovery time is measured from when the input reenters the valid range; no latch-up or damage occurs within rated limits. This behavior is fully characterized and guaranteed for the AD9243ASZRL across its operating temperature range.

What is the purpose of the CAPT and CAPB pins on the AD9243ASZRL, and how should they be connected?

CAPT (Pin 37) and CAPB (Pin 36) are dedicated noise-reduction bypass pins for the internal MDAC stages. They must each be connected to AVSS through a 0.1 µF ceramic capacitor placed as close as possible to the pin. These capacitors stabilize internal charge redistribution during pipeline conversion and reduce switching noise coupling into the analog core. Omitting or misplacing these caps increases DNL variation and degrades SFDR by up to 6 dB. Their function is specific to the AD9243ASZRL's multistage architecture and is documented in the "Noise Reduction" section of the datasheet.

Is the AD9243ASZRL compatible with 3.3 V digital logic interfaces, and how is this configured?

Yes, the AD9243ASZRL supports 3.3 V digital interfacing via the DRVDD supply pin (Pin 6). When DRVDD = 3.3 V, output VOH is ≥2.4 V and VOL is ≤0.7 V under 50 µA load-meeting standard 3.3 V CMOS thresholds. DVDD (Pin 3) remains at +5 V for internal logic. This dual-supply configuration isolates driver voltage from core logic, enabling seamless connection to 3.3 V FPGAs or microcontrollers without level shifters. All timing parameters-including tOD (8–19 ns)-are validated at DRVDD = 3.3 V for the AD9243ASZRL.