AD7864BSZ-1REEL

Overview

The AD7864BSZ-1REEL is a high-speed, low-power, 4-channel simultaneous sampling 12-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 5 V supply and features four track-and-hold amplifiers with an acquisition time of 0.35 μs and a conversion time of 1.65 μs per channel. The device supports input voltage ranges of ±10 V or ±5 V and includes overvoltage protection on analog inputs. It utilizes a high-speed parallel interface compatible with 3 V processors and offers a typical power dissipation of 90 mW in normal mode, reducing to 20 μW in standby.

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information across channels.
• Hardware or software selectable channel sequence for optimized throughput.
• Integrated 2.5 V reference and on-chip clock oscillator simplify system design.
• Overvoltage protection allows analog inputs to withstand voltages up to ±20 V.

Applications

• AC motor control
• Uninterrupted power supplies
• Data acquisition systems
• Communications

Procurement Notes

Verify the specific suffix 'REEL' indicates tape and reel packaging rather than tray. Confirm the '-1' designation corresponds to the ±10 V or ±5 V input range variant. Ensure the B version temperature rating (-40°C to +85°C) meets application requirements. Check for RoHS compliance status as indicated in the ordering guide.

Selection Notes

Select this component when simultaneous sampling of four channels is required to maintain phase coherence. Choose the -1 variant for bipolar ±10 V or ±5 V inputs. Consider the internal clock for simplicity or external clock for precise timing synchronization. Evaluate the 1.65 μs conversion time against system throughput needs.

Part Context

The AD7864 series includes variants with different input ranges: -1 for ±10 V/±5 V, -2 for unipolar 0 V to 2.5 V/5 V, and -3 for ±2.5 V. The BSZ-1REEL denotes the B grade, lead-free (Z) MQFP package, and reel packaging. It belongs to the high-speed SAR ADC family designed for industrial applications requiring multi-channel precision.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin compatibility and input range specifications before considering alternative components from other manufacturers.

FAQ

How is the conversion sequence selected?

The conversion sequence can be selected via hardware using the SL1 to SL4 pins when H/S SEL is Logic 0, or via software by programming the channel select register through DB0 to DB3 when H/S SEL is Logic 1.

What is the maximum throughput rate for all four channels?

The maximum throughput for all four channels is 130 kSPS for the read-during-conversion sequence operation.

Can the AD7864 interface with 3 V processors?

Yes, the high-speed parallel interface allows interfacing to 3 V processors by powering the output data drivers (VDRIVE) with a 3 V ± 10% supply instead of the standard 5 V.