Analog Devices Inc. AD9240ASRL

Overview

AD9240ASRL from Analog Devices is a monolithic 14-bit, 10 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 77.5 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 direct-IF downconversion receivers and high-fidelity data acquisition systems.

For engineers reviewing the AD9240ASRL datasheet, AD9240ASRL pinout, AD9240ASRL application, or AD9240ASRL equivalent, this page provides verified technical context, real-world AC/DC performance boundaries, package-specific layout guidance, and validated alternative options for communication, imaging, and medical signal chain design.

Technical Context

The AD9240ASRL employs a four-stage differential pipelined architecture with digital error correction logic, enabling guaranteed no-missing-codes operation across –40°C to +85°C. Its sample-and-hold amplifier supports both single-ended and differential inputs, with configurable input spans of 2 V_p-p or 5 V_p-p via internal 1 V or 2.5 V reference modes.

Conversion latency is fixed at three clock cycles; the device uses the rising edge of CLK for sampling and requires external RBIAS resistor (typically 2 kΩ) to set power/performance trade-off. Digital outputs are CMOS-compatible and configurable for +3.3 V or +5 V logic families via DRVDD supply.

Key Specifications

Pinout & Package

AD9240ASRL is housed in a 44-lead Metric Quad Flatpack (MQFP) with 0.8 mm lead pitch and exposed thermal pad. Pin 1 is marked by a corner cut; pins 8–10, 26–27, 30, 34, 38, 40, 43–44 are no-connect (NC). Ground separation (AVSS, DVSS, DRVSS) and supply isolation (AVDD, DVDD, DRVDD) support mixed-signal noise immunity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit, 10 MSPS ADC applications.

Compared with AD9240BSTZ, AD9240ASRL offers tighter board space utilization and lower assembly cost in MQFP, while ADS8325IPFBT trades raw speed and integrated functionality for ultra-low power and higher DC precision - making AD9240ASRL optimal for wideband, mixed-signal real-time processing where latency and analog integration are critical.

Availability

AD9240ASRL is available at Aetrix Electronics and suitable for direct-IF receivers, medical ultrasound systems, high-speed data acquisition instruments, and industrial motor control feedback loops requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD9240ASRL 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 AD9240ASRL belongs to Analog Devices' high-speed data converter product line, designed specifically for wideband communications, instrumentation, and medical imaging applications demanding high dynamic range, low latency, and integrated analog front-end functionality.

FAQ

What is the absolute maximum clock frequency supported by the AD9240ASRL?

The AD9240ASRL is specified for a maximum conversion rate of 10 MSPS, corresponding to a minimum clock period of 100 ns. While the clock period may be extended up to 1 ms without performance degradation at +25°C, exceeding 10 MHz violates the AC specifications - including SNR+D, SFDR, and aperture jitter - and is not guaranteed across temperature or voltage variations. Always operate AD9240ASRL within its 10 MSPS rated limit for production designs.

Does the AD9240ASRL require an external reference, or can it operate with its internal reference?

The AD9240ASRL can operate with either its internal reference or an external reference. The SENSE pin selects between modes: logic high enables the internal 2.5 V reference (±35 mV tolerance), while logic low disables it and allows external reference injection at the VREF pin. Internal reference use simplifies BOM and layout; external reference improves dc accuracy and temperature stability when higher precision is required - both configurations are fully supported in AD9240ASRL operation.

How does the BIAS pin affect power consumption and performance of the AD9240ASRL?

The BIAS pin on the AD9240ASRL connects to an external resistor (RBIAS) that sets bias current for internal circuitry. With RBIAS = 2 kΩ, AD9240ASRL achieves its rated 10 MSPS and 285 mW typical power. Increasing RBIAS reduces both sampling rate and power - e.g., 10 kΩ lowers speed to ~5 MSPS and power to ~180 mW. This programmability allows trade-offs between throughput, thermal budget, and battery life in portable AD9240ASRL implementations.

What is the meaning of the OTR (Out-of-Range) signal on the AD9240ASRL?

The OTR signal on the AD9240ASRL is a dedicated digital flag indicating overflow - i.e., when the analog input exceeds the valid range defined by ±VREF. It asserts synchronously with the data output and remains active for one clock cycle. Combined with the MSB, OTR distinguishes between high overflow (+FS + ε) and low overflow (–FS – ε), enabling real-time saturation detection and closed-loop AGC or gain adjustment in AD9240ASRL-based signal chains.

Can the AD9240ASRL accept single-ended analog inputs, or is differential operation mandatory?

The AD9240ASRL supports both single-ended and differential analog inputs. In single-ended mode, VINB is tied to a fixed common-mode voltage (e.g., 2.5 V), and VINA carries the signal - the internal differential input stage still functions, providing inherent noise rejection. However, differential operation delivers superior AC performance: 90 dB SFDR vs. ~80 dB in single-ended mode at 5 MHz, due to common-mode distortion cancellation. Both configurations are valid and documented for AD9240ASRL use.