AD7111ABR

Overview

The AD7111ABR is a monolithic multiplying D/A converter from the LOGDAC family, fabricated in LC2MOS technology. It provides an attenuation range of 0 dB to 88.5 dB with a nominal resolution of 0.375 dB. The device accepts an 8-bit parallel digital input which is decoded into a 17-bit word for an R-2R ladder. It operates on a single +5 V supply and features current output. The AD7111ABR is specified for industrial temperature ranges (-40°C to +85°C) and guarantees monotonicity over specific attenuation ranges depending on step size.

Feature Summary

• 17-bit internal resolution providing 0.375 dB step accuracy
• Wide dynamic range: 0 dB to 88.5 dB attenuation
• Industrial temperature grade (-40°C to +85°C)
• 8-bit parallel interface with transparent latch operation

Applications

• Audio Attenuators
• Sonar Systems
• Function Generators
• Digitally Controlled AGC System

Procurement Notes

Verify the package option 'R' corresponds to the SOIC-16 form factor required for the design. Confirm that the industrial temperature grade (-40°C to +85°C) meets the environmental specifications. Ensure the system power supply remains stable at +5 V, as gain error and accuracy are sensitive to supply variations.

Selection Notes

Select the AD7111ABR when an 8-bit microprocessor interface is preferred over direct 17-bit addressing. Compare against the AD7111ACR if a wider guaranteed accuracy range (0 dB to 72 dB) is required instead of the ABR's 60 dB guarantee. Ensure the output amplifier selection supports the low bias current requirements to minimize offset errors.

Part Context

The AD7111ABR belongs to the AD7111A series, which is pin-compatible with the industry-standard AD7524. This compatibility allows for easy upgrades of existing designs to benefit from wider dynamic range and finer step resolution. The 'ABR' suffix denotes the Industrial temperature grade and SOIC package.

Replacement Considerations

Public confirmed substitute part numbers: ADA4610-1ARZ.