Analog Devices Inc. AD7482BST

Overview

AD7482BST from Analog Devices is a 12-bit, 3 MSPS successive approximation register (SAR) analog-to-digital converter with parallel interface, 40 MHz input bandwidth, internal 2.5 V reference, and dual power-saving modes (nap: 2.5 mW; standby: 10 µW). It operates from a single 5 V supply and supports shifted input range (−200 mV to +2.7 V), enabling use with single-supply op amps in high-speed data acquisition systems.

For engineers reviewing the AD7482BST datasheet, AD7482BST pinout, AD7482BST application, or AD7482BST equivalent, key selection criteria include throughput rate (3 MSPS), dc accuracy (±0.5 LSB INL, B grade), overrange capability (13th bit), VDRIVE-configurable I/O voltage (2.7–5.25 V), and low-power operation across nap/standby modes - all critical for embedded instrumentation, real-time control, and portable test equipment.

Technical Context

The AD7482BST employs an algorithmic SAR architecture with no pipeline delay, using a capacitive DAC and internal track-and-hold amplifier optimized for >40 MHz full-power bandwidth. Conversion initiates on the falling edge of CONVST and completes in 300 ns, with 70 ns acquisition time for full-scale step inputs.

It features two parallel interface modes (Mode 1 and Mode 2), selectable via MODE1/MODE2 pins, differing in BUSY timing and output latching behavior. The device supports both internal and external 2.5 V references, with REFSEL and CBIAS pins enabling proper decoupling configuration per reference source.

Key Specifications

Pinout & Package

The AD7482BST is housed in a 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant and rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SAR ADC applications.

Compared with AD7484BSTZ, the AD7482BST trades resolution for speed and lower power; versus ADS8325IPFBT, it offers parallel interface and integrated reference at the cost of resolution and supply flexibility - making AD7482BST optimal for 12-bit, 3 MSPS, low-latency embedded systems needing minimal external components.

Availability

AD7482BST is available at Aetrix Electronics and suitable for high-speed data acquisition, industrial process monitoring, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD7482BST 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 Norwood, MA.

The AD7482BST belongs to Analog Devices' high-speed SAR ADC product line, designed specifically for applications demanding low latency, excellent dc accuracy, and flexible power management in instrumentation and control systems.

FAQ

What is the maximum input frequency the AD7482BST can accurately digitize?

The AD7482BST has a full-power bandwidth of 40 MHz at the −3 dB point and 3.5 MHz at the −0.1 dB point. This means it can accurately resolve sinusoidal inputs up to 3.5 MHz with minimal amplitude error (<0.1%), supporting applications like intermediate-frequency sampling and high-fidelity sensor readout. Its 40 MHz bandwidth also ensures faithful capture of fast transients and harmonics in industrial signal chains.

Does the AD7482BST require an external reference, or does it include one?

AD7482BST includes an internal 2.5 V reference with ±100 mV error over temperature, accessible via REFOUT. It also supports external 2.5 V ±1% references applied to REFIN. When using the internal reference, REFSEL must be decoupled to AGND with a 1 nF capacitor; for external reference, REFSEL connects directly to AGND. Both configurations are fully supported in the AD7482BST datasheet.

How does the AD7482BST handle input signals outside its nominal 0 V to 2.5 V range?

The AD7482BST supports a shifted input range from −200 mV to +2.7 V using its offset shift capability, allowing bipolar signal acquisition with single-supply op amps. Additionally, its 13th-bit overrange feature flags inputs exceeding ±8% of full scale (i.e., beyond −200 mV or +2.7 V), enabling firmware to detect clipping without losing valid data - a key advantage in dynamic signal environments.

What are the timing differences between Parallel Mode 1 and Parallel Mode 2 on the AD7482BST?

In Parallel Mode 1 (MODE1=LOW, MODE2=LOW), BUSY goes high when the conversion result is latched into the output register. In Parallel Mode 2 (MODE1=HIGH, MODE2=LOW), BUSY returns high immediately after conversion completion (300 ns), but the result is not latched until the next CONVST falling edge. Mode 2 enables tighter synchronization in pipelined systems, while Mode 1 simplifies read timing for simpler controllers.

Can the AD7482BST operate from a 3.3 V supply?

No - the AD7482BST requires AVDD and DVDD between 4.75 V and 5.25 V. However, its VDRIVE pin accepts 2.7 V to 5.25 V, allowing digital I/O lines (D0–D12, CS, RD, etc.) to interface directly with 3.3 V logic families. This separation lets the AD7482BST coexist in mixed-supply systems: 5 V analog/digital core, 3.3 V controller interface - without external level shifters.