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AD7891AS1

8-ch 12-bit 454kSPS ADC DAS, bipolar inputs, parallel/serial, 44-MQFP, 5V supply

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Manufacturer Part：

AD7891AS1

Package：

MQFP-44 (10 x 10 mm)

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Description

Product Overview

The AD7891AS-1 from Analog Devices is an LC²MOS 8-Channel, 12-Bit High Speed Data Acquisition System in a 44-lead MQFP package. It integrates an input multiplexer, on-chip track/hold amplifier, a fast 12-bit ADC, a 2.5 V reference, and parallel/serial interface on a single chip operating from a 5 V supply.

Key Specifications

Resolution 12 Bit
Channels 8 Single-Ended
Conversion Time 1.6 μs
Throughput Rate 454.5 kSPS (AD7891-1)
Analog Input Range ±5 V, ±10 V
SNR 70 dB min
Supply Voltage 5 V single
Power Dissipation 82 mW typ
Interface Parallel / Serial (pin-selectable)
Package 44-Lead MQFP

Features

  • Fast 12-bit ADC with 1.6 μs conversion time
  • 8 single-ended analog input channels with overvoltage protection
  • On-chip track/hold amplifier and 2.5 V reference
  • Parallel and serial interface (MODE pin selectable)
  • Single 5 V supply, low power operation (100 mW max)
  • Power-down mode (75 μW typ)
  • ±5 V and ±10 V bipolar input ranges

Applications

  • Data acquisition systems
  • Motor control
  • Mobile communication base stations
  • Industrial instrumentation
  • Process monitoring

The AD7891AS-1 is an 8-channel, 12-bit high speed data acquisition system manufactured by Analog Devices. It contains an input multiplexer, on-chip track/hold amplifier, high-speed 12-bit ADC, 2.5 V reference, and high-speed interface. The device operates from a single 5 V supply and accepts bipolar analog input ranges of plus/minus 5 V and plus/minus 10 V (AD7891-1 variant). The parallel or serial interface structure is determined by the MODE pin, providing easy interfacing to modern microprocessors, microcontrollers, and digital signal processors.

The AD7891AS-1 operates as a complete data acquisition system. The analog input is selected by the multiplexer from 8 single-ended channels, each with overvoltage protection. The selected signal passes through the on-chip track/hold amplifier, which acquires the input during the tracking phase. Upon CONVST assertion, the track/hold enters hold mode and the 12-bit successive approximation ADC performs the conversion in 1.6 microseconds. The result is available through either the parallel or serial interface as selected by the MODE pin. An internal 2.5 V reference is provided for ratiometric conversion.

Pin Name Type Function
1-6 VIN1A-VIN3B Input Analog input channels 1-3
7-18 VIN4A-VIN8B Input Analog input channels 4-8
20-21 REF IN/OUT I/O Reference input/output
29 VDD Power +5 V supply
30 AGND Ground Analog ground
34 EOC Output End of conversion signal
36 CONVST Input Conversion start signal
40 CS Input Chip select (active low)
42 MODE Input Interface mode select (parallel/serial)
43-50 DB11-DATA IN I/O Data bus / serial data
  • Multichannel data acquisition systems
  • Motor control and drive feedback
  • Mobile communication base station monitoring
  • Industrial instrumentation and measurement
  • Automated test equipment
Manufacturer Part Number Package Notes
Analog Devices AD7891AS-2 MQFP-44 Unipolar input ranges variant
Analog Devices AD7891ASZ-1 MQFP-44 Pb-free version
Analog Devices AD7890 TSSOP-28 8-ch 12-bit with serial interface
Maxim Integrated MAX1300 TQFP-48 8-ch 12-bit 500kSPS ADC
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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