AD7865BSZ-1

Overview

The AD7865BSZ-1 is a four-channel, simultaneous sampling, fast, 14-bit analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single +5 V supply and features a successive approximation architecture with a conversion time of 2.4 µs per channel. The device includes four track/hold amplifiers, an internal 2.5 V reference, and an on-chip clock oscillator. It supports input ranges of ±10 V and ±5 V, with a maximum throughput of 350 kSPS for a single channel and 100 kSPS for all four channels. The component utilizes a high-speed parallel interface compatible with 3 V processors and is housed in a 44-lead Plastic Lead Quad Flatpack (PQFP).

Feature Summary

• Four simultaneously sampled inputs preserve relative phase information across channels.
• Hardware or software selectable channel sequence allows conversion of any subset of the four channels to maximize throughput.
• Analog inputs feature overvoltage protection to prevent damage during voltage excursions.
• Low power consumption with a dedicated standby mode for energy savings.

Applications

• AC Motor Control
• Uninterruptible Power Supplies
• Industrial Power Meters/Monitors
• Data Acquisition Systems

Procurement Notes

Verify the specific suffix 'BSZ-1' against the manufacturer's current ordering guide to confirm the exact accuracy grade and temperature range specifications. Ensure that the required input voltage range matches the ±10 V and ±5 V capabilities defined for this variant. Confirm package availability and lead times through authorized distribution channels prior to finalizing procurement plans.

Selection Notes

Select the AD7865BSZ-1 when simultaneous sampling of four channels is required to maintain signal phase relationships. This model is suitable for applications needing ±10 V or ±5 V bipolar input ranges. Consider the AD7865BSZ-2 or AD7865BSZ-3 if unipolar or ±2.5 V ranges are preferred. Evaluate the parallel interface requirements against the host processor's speed and voltage levels.

Part Context

The AD7865 series comprises four-channel, 14-bit ADCs designed for high-speed data acquisition. The AD7865BSZ-1 specifically denotes the B-grade accuracy version with the -1 suffix indicating support for ±10 V and ±5 V input ranges. It belongs to the broader AD7865 family which also includes variants optimized for different voltage ranges and temperature grades.

Replacement Considerations

Direct pin-compatible replacements within the same family include AD7865ASZ-1 for lower accuracy requirements or AD7865YSZ-1 for extended temperature operation. For different input ranges, consider AD7865BSZ-2 (unipolar) or AD7865BSZ-3 (±2.5 V bipolar). Verify electrical compatibility before substitution.

FAQ

How is the channel conversion sequence selected?

The channel sequence can be selected via hardware using the SL1–SL4 input pins or via software by programming the channel select register using the DB0–DB3 data lines.

What is the function of the FRSTDATA pin?

FRSTDATA is a logic output that indicates when the Output Data Register Pointer is addressing Register 1, signaling the start of the data read sequence.

Can the AD7865BSZ-1 interface with 3 V processors?

Yes, the VDRIVE pin allows the digital output drivers to be powered by a 3 V supply, facilitating interfacing with 3 V processors and DSPs while maintaining 5 V logic compatibility.