Analog Devices Inc. AD7482BSTZ

Overview

AD7482BSTZ from Analog Devices is a 12-bit, 3 MSPS successive approximation register (SAR) analog-to-digital converter with parallel interface, internal 2.5 V reference, and ±200 mV input offset shift capability. It delivers 71 dB SINAD at 1 MHz input, supports 0 V to 2.5 V nominal analog input range, and operates from a single 5 V supply. It is used in high-speed data acquisition systems requiring low-latency, pipeline-free conversion.

For engineers reviewing the AD7482BSTZ datasheet, AD7482BSTZ pinout, AD7482BSTZ application, or AD7482BSTZ equivalent, key selection considerations include its 300 ns conversion time, dual power-saving modes (nap/standby), 40 MHz full-power bandwidth, 13-bit overrange flag (D12), and VDRIVE-configurable digital I/O voltage (2.7–5.25 V).

Technical Context

The AD7482BSTZ employs an algorithmic SAR architecture with capacitive DAC and integrated track-and-hold, eliminating pipeline latency. Its conversion is initiated on the falling edge of CONVST, completes in 300 ns, and supports two parallel interface modes (2.5 MSPS and 3 MSPS throughput).

It features user-accessible offset register for system-level DC offset correction and a 13th bit (D12) indicating ±8% full-scale overrange. The internal 2.5 V reference is buffered at REFOUT and can be disabled in favor of an external 2.5 V source applied to REFIN.

Key Specifications

Pinout & Package

The AD7482BSTZ is housed in a 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch), specified 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 AD7482BSTZ, AD7484BSTZ offers higher resolution in identical packaging but trades 1 MSPS throughput, while ADS8325IPFBT provides superior 16-bit DC linearity at the cost of missing integrated reference and overrange detection - making AD7482BSTZ optimal for balanced speed, integration, and diagnostic capability.

Availability

AD7482BSTZ is available at Aetrix Electronics and suitable for medical ultrasound beamforming, industrial motor control feedback, communications baseband receivers, and test & measurement digitizers requiring stable component supply and long-term production continuity.

Supply support for AD7482BSTZ 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 AD7482BSTZ belongs to Analog Devices' high-speed SAR ADC product line, designed specifically for applications demanding low-latency, pipeline-free digitization with integrated reference and flexible power management - targeting data acquisition, industrial control, and communications infrastructure.

FAQ

What is the maximum analog input frequency the AD7482BSTZ can accurately digitize?

The AD7482BSTZ has a full-power bandwidth of 40 MHz at −3 dB, meaning it maintains specified AC performance (e.g., 71 dB SINAD) for sinusoidal inputs up to 40 MHz. For Nyquist-limited sampling, its 3 MSPS throughput supports baseband signals up to 1.5 MHz without aliasing - but with appropriate anti-alias filtering, it can digitize IF signals near 40 MHz in undersampling architectures. The AD7482BSTZ's wide analog input bandwidth enables faithful capture of fast transients and high-frequency modulated waveforms.

Does the AD7482BSTZ require an external reference, or does it include one?

The AD7482BSTZ includes an internal 2.5 V reference buffered at the REFOUT pin, eliminating the need for an external reference in most applications. A 470 nF capacitor must be placed between REFOUT and AGND for stability. However, the device also supports an external 2.5 V reference applied to REFIN - useful when higher initial accuracy or lower temperature drift is required. When using the external reference, REFSEL must be tied to AGND, and the internal reference is disabled.

How does the D12 pin function on the AD7482BSTZ, and what design value does it provide?

The D12 pin on the AD7482BSTZ is a dedicated overrange indicator that asserts high when the analog input exceeds ±8% of full scale (i.e., outside −200 mV to +2.7 V). It is not part of the 12-bit data word but serves as a real-time diagnostic flag. This enables immediate detection of signal clipping without post-processing, allowing systems to dynamically adjust gain, trigger alarms, or initiate protective actions - enhancing reliability in safety-critical or adaptive signal chain applications.

What are the power management options available on the AD7482BSTZ, and how do they affect wake-up time?

The AD7482BSTZ offers three power states: normal (90 mW), nap mode (2.5 mW), and standby mode (10 µW). Nap mode retains reference circuitry and wakes in 300 ns - suitable for burst-mode acquisition. Standby mode powers down nearly all circuitry; wake-up time is 80 µs with external reference or 500 ms with internal reference. These modes let designers optimize average power per sample based on duty cycle - for example, using nap mode between consecutive 3 MSPS samples reduces total energy without sacrificing throughput.

Can the AD7482BSTZ interface directly with a 3.3 V microcontroller, and how is this achieved?

Yes, the AD7482BSTZ can interface directly with a 3.3 V microcontroller using its VDRIVE pin. By applying 3.3 V to VDRIVE, all digital I/O pins (D0–D12, CS, RD, WRITE, BUSY, MODE1/2, etc.) operate at 3.3 V logic levels - meeting VIH/VIL thresholds without level shifters. DVDD and AVDD remain at 5 V for analog/digital core operation. This dual-supply flexibility simplifies mixed-voltage system design and avoids signal integrity issues associated with external translation circuits.