AD7891YSZ-1

ADCs/DACs - Special Purpose Overview

The AD7891YSZ-1 is an automotive-grade, 8-channel, 12-bit data acquisition system manufactured by Analog Devices. It integrates a multiplexer, track/hold amplifier, SAR ADC, and 2.5 V reference on a single chip. Operating from a single +5 V supply, it supports ±5 V or ±10 V input ranges with a maximum sample rate of 454.5 kSPS. The device features overvoltage protection up to ±17 V per channel and offers selectable parallel or serial interfaces via the MODE pin. Typical power consumption is 82 mW in normal mode and 75 mW in standby.

ADCs/DACs - Special Purpose Feature Summary

• 8-channel multiplexed input with ±5 V or ±10 V range selection
• 12-bit resolution with 454.5 kSPS sampling rate (hardware start)
• On-chip 2.5 V reference and track/hold amplifier
• Parallel or serial interface selectable via MODE pin
• Automotive temperature range: -55°C to +105°C

ADCs/DACs - Special Purpose Applications

• Motor control systems
• Mobile communication base stations
• Industrial instrumentation

ADCs/DACs - Special Purpose Procurement Notes

Verify the suffix 'Z' indicates Pb-free compliance. Confirm the '-1' designation corresponds to the ±5 V/±10 V bipolar input range variant. Ensure the MQFP-44 package matches the target PCB footprint. Check for moisture sensitivity level requirements during assembly.

ADCs/DACs - Special Purpose Selection Notes

Select this model for applications requiring extended automotive temperature stability (-55°C to +105°C). Choose the parallel interface for throughput speeds up to 500 kSPS if using the -2 variant, or 454.5 kSPS for the -1 variant. Verify that the 5 V single-supply operation aligns with system power constraints.

ADCs/DACs - Special Purpose Part Context

This component belongs to the AD7891 family of high-speed data acquisition systems. The Y version specifically denotes the automotive grade with an extended operating temperature range compared to the commercial A and B versions. It shares the same functional block diagram but differs in environmental qualification and reliability standards.

ADCs/DACs - Special Purpose Replacement Considerations

Direct substitutes include other AD7891 variants such as AD7891AS-1Z or AD7891AP-1, though these are limited to commercial temperature ranges (-40°C to +85°C). No direct automotive-grade replacements with identical specifications are listed in the provided documentation.

ADCs/DACs - Special Purpose FAQ

What is the maximum overvoltage protection rating for the AD7891-1?

Each channel can withstand overvoltages of ±17 V without affecting the conversion on a selected channel.

How is the interface mode determined?

The MODE pin determines the interface structure. A logic high selects parallel mode, while a logic low selects serial mode.

What is the typical power dissipation in normal mode?

The typical power dissipation in normal mode is 82 mW when powered by a 5 V supply.