Analog Devices Inc. AD5305BRM

Overview

AD5305BRM from Analog Devices is an 8-bit quad buffered voltage-output DAC in 10-lead MSOP, operating from 2.5 V to 5.5 V with 500 μA typical supply current at 3 V, ±1 LSB INL (A version), and I²C-compatible 2-wire serial interface - used for digital gain/offset adjustment in portable instrumentation.

For engineers reviewing the AD5305BRM datasheet, AD5305BRM pinout, AD5305BRM application, or AD5305BRM equivalent, key selection criteria include guaranteed monotonicity, rail-to-rail output swing (0 V to VREF), simultaneous update via LDAC, power-down modes (80 nA @ 3 V), and software readback capability.

Technical Context

The AD5305BRM implements four independent resistor-string DAC channels sharing a single unbuffered REFIN pin, each driving a rail-to-rail output buffer amplifier with 0.7 V/μs slew rate and 2.5 μs power-up time from power-down mode. Its double-buffered input logic separates data loading from DAC register update.

It uses a 2-wire SMBus-compatible interface supporting up to 400 kHz clock rates, with address selection via A0 pin, and supports multiple devices on one bus. The device features power-on reset to 0 V, software clear, and three programmable power-down modes - high-Z, 1 kΩ-to-GND, and 100 kΩ-to-GND.

Key Specifications

Pinout & Package

AD5305BRM is housed in a 10-lead MSOP package (3.0 mm × 3.0 mm, 0.5 mm pitch) with exposed pad for thermal performance. Pin functions are validated per Analog Devices Rev. G datasheet Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5305BRM, AD5315BRM offers higher resolution at identical form factor and interface, while MCP4725A0T-E/CH trades integration for lower unit cost and smaller per-channel footprint - neither is pin-compatible, but both serve overlapping programmable analog output roles.

Availability

AD5305BRM is available at Aetrix Electronics and suitable for portable instrumentation, digital calibration systems, and industrial process control requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD5305BRM 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, headquartered in Norwood, MA.

The AD5305BRM belongs to the AD53xx quad DAC product line designed for precision, low-power, multi-channel analog output in space-constrained and battery-operated systems.

FAQ

What is the reference voltage range supported by the AD5305BRM?

The AD5305BRM accepts a reference voltage from 0.25 V to VDD on its REFIN pin. This unbuffered input allows flexible scaling - for example, with VDD = 3.3 V and REFIN = 2.5 V, the output range becomes 0 V to 2.5 V. Input impedance is 37 kΩ in normal operation and >10 MΩ in power-down mode, minimizing loading on external references.

Does the AD5305BRM support simultaneous update of all four DAC outputs?

Yes, the AD5305BRM supports simultaneous update via its LDAC (Load DAC) function - either through the dedicated LDAC pin or via software command. When activated, LDAC transfers data from the input registers to all four DAC registers at once, eliminating inter-channel timing skew critical in coordinated analog control applications like waveform generation or multi-axis actuator biasing.

What power-down modes does the AD5305BRM offer, and how do they affect output behavior?

The AD5305BRM provides three programmable power-down modes: (1) high-impedance output (Hi-Z), (2) 1 kΩ pull-down to GND, and (3) 100 kΩ pull-down to GND. In all modes, supply current drops to ≤80 nA @ 3 V. Output state is preserved in Hi-Z mode, while pull-down modes actively drive outputs low - useful for fail-safe conditions in industrial interfaces where floating analog nodes are unacceptable.

Can the AD5305BRM operate from a 2.5 V supply, and what is its typical current draw at that voltage?

Yes, the AD5305BRM operates across 2.5 V to 5.5 V. At 2.5 V supply, its typical supply current is 500 μA in normal operation (per datasheet Table 1, VDD = 2.5 V to 3.6 V range). Power consumption is therefore ~1.25 mW - well-suited for ultra-low-power applications such as coin-cell–powered sensors or wearable medical devices requiring stable analog outputs.

Is readback functionality available on the AD5305BRM, and how is it implemented?

Yes, the AD5305BRM supports data readback over the 2-wire interface. After writing to a DAC register, the host can issue a read command to retrieve the currently loaded 8-bit value from that channel's DAC register. This feature enables real-time verification, fault detection, and nonvolatile configuration recovery - especially valuable in safety-critical or remote systems where write integrity must be confirmed.