Analog Devices Inc. AD5320BRM

Overview

AD5320BRM from Analog Devices is a single-channel, 12-bit buffered voltage-output DAC in a 6-lead SOT-23 package, operating from 2.7 V to 5.5 V with 140 μA typical supply current at 5 V, rail-to-rail output swing, and guaranteed monotonicity-used for precision digital gain/offset adjustment in portable instrumentation.

For engineers reviewing the AD5320BRM datasheet, AD5320BRM pinout, AD5320BRM application, or AD5320BRM equivalent, this page delivers verified electrical parameters, power-down behavior, serial interface timing, output settling performance, and real-world interfacing constraints for battery-powered and space-constrained designs.

Technical Context

The AD5320BRM implements a resistor-string DAC architecture with an integrated rail-to-rail output buffer amplifier, deriving its reference directly from VDD to maximize dynamic range. Its 3-wire SPI-/QSPI-/MICROWIRE-compatible interface operates up to 30 MHz (at VDD ≥ 3.6 V) with Schmitt-triggered inputs and SYNC interrupt capability.

Power management includes three software-selectable power-down modes (1 kΩ-to-GND, 100 kΩ-to-GND, or high-Z), reducing supply current to 200 nA at 5 V while preserving DAC register contents. A power-on reset ensures VOUT = 0 V until first valid write.

Key Specifications

Pinout & Package

AD5320BRM is packaged in a 6-lead SOT-23 (JEDEC MO-178AA), footprint-compatible with industry-standard passive and IC placements. Thermal resistance θ_JA = 240°C/W enables operation up to +105°C ambient without heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-output DAC applications.

Compared with AD5320BRM, AD5300BRM sacrifices 4 bits of resolution for lower cost and marginally lower power, while AD5310BRM offers a balanced middle ground with tighter INL and identical form factor-neither provides the full 12-bit monotonic assurance required for metrology-grade calibration.

Availability

AD5320BRM is available at Aetrix Electronics and suitable for portable instrumentation, digital offset calibration, and programmable voltage source applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD5320BRM 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, with R&D and manufacturing operations worldwide.

The AD5320BRM belongs to Analog Devices' precision nanoDAC® family-designed specifically for low-power, space-constrained applications demanding rail-to-rail output, monotonicity, and robust serial interfacing in portable and industrial systems.

FAQ

What is the maximum clock frequency supported by the AD5320BRM serial interface?

The AD5320BRM supports up to 30 MHz SCLK frequency when VDD is between 3.6 V and 5.5 V, and up to 20 MHz when VDD is between 2.7 V and 3.6 V. Timing margins (e.g., t5 data setup = 5 ns) are specified across temperature and voltage ranges, and the interface remains compatible with SPI, QSPI, and MICROWIRE protocols without external level shifters.

Does the AD5320BRM require an external reference voltage?

No, the AD5320BRM does not require an external reference voltage. Its reference is derived internally from the VDD supply rail, enabling rail-to-rail output (0 V to VDD) and eliminating the need for external reference ICs or resistor dividers-simplifying design and reducing component count in battery-powered systems.

How does the power-on reset function in the AD5320BRM?

The AD5320BRM incorporates an internal power-on reset circuit that forces the DAC register to zero and holds VOUT at 0 V until the first valid 16-bit write completes. This behavior is guaranteed across the full −40°C to +105°C operating range and prevents undefined output transients during system startup-critical for protecting downstream analog circuitry.

What are the output load capabilities of the AD5320BRM?

The AD5320BRM's on-chip output buffer can source up to 50 mA and sink up to 50 mA at VDD = 5 V (20 mA at VDD = 3 V), and drives capacitive loads up to 1000 pF with 2 kΩ resistive load. It achieves 8 μs half-scale settling time unloaded and remains stable with ≥470 pF capacitance at open-circuit output-enabling direct connection to op-amp inputs or FET gates without buffering.

Can the AD5320BRM operate from a 3.3 V supply?

Yes, the AD5320BRM is fully specified for operation from 2.7 V to 5.5 V, including standard 3.3 V rails. At 3.3 V, it draws 115 μA typical supply current, achieves 1 V/μs slew rate, and maintains rail-to-rail output (0 V to 3.3 V). Logic thresholds scale with VDD (e.g., VIH = 2.1 V min), ensuring reliable interface with 3.3 V microcontrollers.