AD7718BRU-REEL7

Overview

The AD7718BRU-REEL7 is a complete analog front-end featuring a 24-bit Sigma-Delta ADC, housed in a 28-lead TSSOP package. It supports 4/5 fully-differential or 8/10 pseudo-differential input channels with a programmable gain amplifier ranging from 1 to 128. The device operates on a single 3 V or 5 V supply, consuming 3.84 mW typically at 3 V. It utilizes a 32 kHz crystal and internal PLL for clocking, offering software-programmable output data rates up to 1.365 kS/s. Key electrical specifications include ±10 ppm maximum integral nonlinearity, simultaneous 50 Hz and 60 Hz rejection, and factory calibration for offset and gain errors.

Feature Summary

• Factory-calibrated architecture ensuring high accuracy without external trimming
• Configurable input multiplexer supporting both differential and pseudo-differential signal connections
• Integrated programmable gain amplifier allowing direct transducer interfacing
• Simultaneous notch filtering capability for power line interference rejection

Applications

• Industrial process control systems
• Pressure transducers and smart transmitters
• Portable instrumentation devices
• General-purpose data acquisition modules

Procurement Notes

Verify the specific suffix REEL7 indicates tape-and-reel packaging when sourcing. Confirm the BRU designation corresponds to the TSSOP-28 package variant. Ensure the component meets the required industrial temperature range of -40°C to +85°C for your application environment before finalizing procurement.

Selection Notes

Select this component when 24-bit resolution and low power consumption are critical. Compare against the AD7708 if 16-bit resolution suffices, as they are pin-compatible. Consider the CHOP mode settings based on whether optimizing for analog performance or channel throughput is the primary design goal for the target application.

Part Context

This part belongs to the AD7708/AD7718 family of low-frequency analog front-ends. It serves as the higher-resolution counterpart to the AD7708, sharing identical pinouts and functionality but providing 24-bit precision instead of 16-bit. Both devices are designed for low-power, high-accuracy measurement applications requiring integrated signal conditioning.

Replacement Considerations

The AD7708BRU-REEL7 is a pin-for-pin compatible alternative offering 16-bit resolution. Designers upgrading from 16-bit to 24-bit can use this part without hardware modifications. No other direct substitutes are documented in the provided datasheet.