AD7890BR-2REEL

ADCs/DACs - Special Purpose Overview

The AD7890BR-2REEL is an 8-channel, 12-bit data acquisition system fabricated in LC2MOS technology. It integrates a multiplexer, track/hold amplifier, SAR ADC, and 2.5 V reference on a single chip. Designed for single 5 V supply operation, it features a serial interface compatible with microcontrollers and DSPs. The device supports a unipolar input range of 0 V to 2.5 V. Key electrical parameters include a maximum conversion time of 5.9 μs, a typical power dissipation of 30 mW in normal mode, and a standby power consumption of 75 μW. It operates within a commercial temperature range of -40°C to +85°C.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 8-channel multiplexer with separate access to MUX OUT for external antialiasing filtering
• High-speed serial interface supporting self-clocking (master) and external clocking (slave) modes
• On-chip 2.5 V voltage reference with option for external reference input
• Low-power operation: 30 mW typical in normal mode, 75 μW typical in standby

ADCs/DACs - Special Purpose Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data acquisition modules for microcontroller-based embedded systems
• Portable instrumentation powered by single 5 V supplies
• Vibration and temperature monitoring networks

ADCs/DACs - Special Purpose Procurement Notes

Verify the suffix 'REEL' indicates tape-and-reel packaging suitable for automated surface-mount assembly. Confirm the '-2' designation corresponds to the 0 V to 2.5 V input range variant. Ensure the B-version grade meets the required -40°C to +85°C operating temperature specifications for the target application environment.

ADCs/DACs - Special Purpose Selection Notes

Select this component when an 8-channel multiplexed input is required with a limited unipolar voltage range of 0 V to 2.5 V. The B-version offers standard commercial temperature performance. Consider the SOIC_W package for space-constrained PCB layouts. Verify that the serial interface timing requirements align with the host processor's capabilities, particularly regarding the self-clocking versus external clocking modes.

ADCs/DACs - Special Purpose Part Context

The AD7890 belongs to Analog Devices' specialized data acquisition family. The BR-2REEL variant specifically denotes the B-grade version in SOIC_W packaging with a 0–2.5 V input range, supplied in reel format. Other variants include the ANZ (PDIP), ARZ (SOIC), and SQ (CerDIP) packages, as well as different input ranges (-4 for 0–4.096 V and -10 for ±10 V).

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements within the same family include AD7890ARZ-2 and AD7890ANZ-2. For applications requiring different input ranges, consider AD7890ARZ-4 or AD7890ARZ-10. Cross-family migration may require schematic redesign due to differing pinouts or interface protocols.