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AD7891AS1

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

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制造商零件：

AD7891AS1

包装：

MQFP-44 (10 x 10 mm)

品牌：

产品类别：

模拟线性集成电路, 集成电路 IC

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说明

产品概览

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.

主要规格

Resolution	12 Bit
渠道	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
电源电压	5 V single
功率耗散	82 mW typ
Interface	Parallel / Serial (pin-selectable)
包装	44-Lead MQFP

特点

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

应用

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

产品介绍：AD7891AS1 产品介绍

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.

工作原理：AD7891AS1 工作原理

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.

引脚说明：AD7891AS1 引脚定义和功能

针脚	名称	类型	功能
1-6	VIN1A-VIN3B	输入	Analog input channels 1-3
7-18	VIN4A-VIN8B	输入	Analog input channels 4-8
20-21	REF IN/OUT	输入/输出	Reference input/output
29	VDD	电源	+5 V supply
30	AGND	地面	Analog ground
34	EOC	输出	End of conversion signal
36	CONVST	输入	Conversion start signal
40	CS	输入	Chip select (active low)
42	MODE	输入	Interface mode select (parallel/serial)
43-50	DB11-DATA IN	输入/输出	Data bus / serial data

Application Scenarios:In which products and applications isAD7891AS1 中古

Multichannel data acquisition systems
Motor control and drive feedback
Mobile communication base station monitoring
Industrial instrumentation and measurement
Automated test equipment

Alternative Models:What chips are recommended as replacements for AD7891AS1

制造商	部件编号	包装	说明
模拟器件公司	AD7891AS-2	MQFP-44	Unipolar input ranges variant
模拟器件公司	AD7891ASZ-1	MQFP-44	Pb-free version
模拟器件公司	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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AD7891AS1

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