Analog Devices Inc. AD5311BRM-REEL7

AD5311BRM-REEL7 Product Summary

The AD5311BRM-REEL7 from Analog Devices Inc. is a 10-bit, single-channel, voltage-output digital-to-analog converter (DAC) designed for precision and portability. Engineered with a rail-to-rail buffered output, it operates from a single supply voltage ranging from 2.5 V to 5.5 V and features a compact 8-MSOP package. Its low power consumption, combined with an I²C-compatible 2-wire serial interface, positions the AD5311BRM-REEL7 as a strong choice for engineers developing battery-operated or space-constrained equipment requiring reliable, accurate analog conversion.

AD5311BRM-REEL7 Main Electrical Parameters and Performance Characteristics

The AD5311BRM-REEL7 features a resolution of 10 bits, delivering a balance between speed and precision for many general and precision analog applications. The device achieves a typical relative accuracy (integral nonlinearity, INL) of ±0.5 LSB and a differential nonlinearity (DNL) of ±0.05 LSB, both of which are guaranteed monotonic over the entire code range. The output voltage swings from close to ground (0.001 V) up to VDD minus 0.001 V, maximizing usable dynamic range.

Other vital parameters include:

Settling time: 6 μs (typical) for a 1/4-scale to 3/4-scale code step at a 5 V supply

Output buffer: Rail-to-rail, ensuring full-range output with low impedance (1 Ω)

Supply current: 120 μA at 3 V (normal mode), dropping to 50 nA at 3 V in power-down mode

Power supply: 2.5 V to 5.5 V, accommodating a wide variety of system voltages

Operating temperature: -40°C to +105°C, supporting industrial environments

AD5311BRM-REEL7 Functional Attributes and Operating Modes

Designed for simplicity and versatility, the AD5311BRM-REEL7 includes an I²C-compatible, 2-wire serial interface capable of operating at clock rates up to 400 kHz. Multiple devices can share the bus, with on-chip address inputs (A0, A1) enabling individual device selection. The DAC draws its reference directly from the supply voltage, which allows for the widest output dynamic range possible with a given VDD.

A notable feature is its power-on reset (POR) function: upon application of power, the DAC output is forced to zero and remains there until the device is configured via a valid serial command. The device also includes both hardware (dedicated PD pin) and software power-down modes, reducing supply current to as little as 50 nA—a critical advantage in low-power designs.

Data readback capability is supported, facilitating in-system diagnostics or configuration verification, further enhancing design robustness. Furthermore, the AD5311BRM-REEL7 supports software-selectable output loads in power-down, accommodating different downstream circuit requirements.

AD5311BRM-REEL7 Integration Details, Package Information, and Pinout

For optimal integration into dense PCB layouts, the AD5311BRM-REEL7 is supplied in an 8-lead MSOP package, measuring just 3.00 mm in width. Pin assignments facilitate straightforward layout and bus routing:

Power supply (VDD): 2.5 V to 5.5 V, with guidance to decouple using a 10 μF capacitor in parallel with a 0.1 μF capacitor to ground.

Address inputs (A0, A1): Allow for device selection in multi-DAC systems.

Serial clock and data (SCL, SDA): Enable high-speed I²C-compatible communication.

Buffered voltage output (VOUT): Provides precise, low-impedance analog voltage directly to the load.

Hardware power-down (PD): For immediate reduction in current consumption via external control.

Ground (GND): Common reference for all circuitry.

This packaging and pinout is tailored to maximize layout flexibility, maintainability, and minimize EMI in both single- and multi-device contexts.

AD5311BRM-REEL7 Application Examples and Design Considerations

Typical use cases for the AD5311BRM-REEL7 span portable instruments, programmable voltage and current sources, offset and gain adjustment in measurement devices, and programmable attenuators. The device’s micropower operation (especially in power-down mode), broad operating temperature, and robust rail-to-rail output are ideal for battery-powered tools, calibration systems, and compact modules where analog precision and low power are priorities.

When designing in the AD5311BRM-REEL7, consider the following engineering factors:

The device’s supply-derived reference means supply noise and stability directly affect output accuracy; proper supply decoupling and regulation become critical.

A feature-rich interface supports both configuration and readback for diagnostics or remote updates.

The hardware power-down provides instantaneous current reduction, vital for systems that must remain ultra-low-power in standby or sleep conditions.

Due to its monotonicity over the entire input code range, it is especially suitable for applications needing glitch-free stepped analog outputs.

Comparable or Replacement Options for the AD5311BRM-REEL7

With the AD5311BRM-REEL7 now classified as obsolete, engineers evaluating drop-in or functional replacements within the same product family or interface standard should consider:

AD5301 (8-bit) and AD5321 (12-bit): Offering similar electrical characteristics, pinouts, and I²C interface, but with lower or higher resolution.

Alternate single-channel DACs from Analog Devices or other manufacturers matching voltage supply, package footprint (8-MSOP), interface (I²C-compatible), power-down features, and output buffer capabilities.

For applications requiring continued production support, verify long-term supply status and consult manufacturer roadmaps before committing design resources.

Conclusion

The AD5311BRM-REEL7 exemplifies a class of high-precision, low-power, I²C-interfaced DACs that enable designers to achieve reliable analog voltage generation in space- and power-constrained systems. Its buffered rail-to-rail output, swift settling, and robust power management make it suitable for both portable and instrumentation-grade designs. As this model is now obsolete, careful assessment of design requirements and forward-looking supply strategy is recommended, with potential transitions to functionally similar DACs as appropriate. For engineers specifying voltage-output DACs in new projects, consideration of supply voltage headroom, system noise immunity, and interface needs remains paramount for optimal system performance.