Hot-selling and scarce AD7891AS-1 8-Channel, 12-Bit High Speed Data Acquisition System QFP44 spot stock

Product Features

The AD7891 is an eight-channel 12-bit data acquisition systemwith a choice of either parallel or serial interface structure . Thepart contains an input multiplexer, an on-chip track/hold amplifier, a high speed 12-bit ADC, a +2 .5 V reference and a highspeed interface . The part operates from a single +5 V supplyand accepts a variety of analog input ranges across two models,the AD7891-1 (±5 V and ± 10 V) and the AD7891-2 (0 V to+2.5 V, 0 V to +5 V and ±2.5 V).

The AD7891 provides the option of either a parallel interface orserial interface structure determined by the MODE pin . Thepart has standard control inputs and fast data access times forboth the serial and parallel interfaces which ensures easy interfacing to modern microprocessors, microcontrollers and digitalsignal processors .

In addition to the traditional dc accuracy specifications such aslinearity, full-scale and offset errors, the part is also specified fordynamic performance parameters including harmonic distortionand signal-to-noise ratio .

Power dissipation in normal mode is 90 mW typical while inthe standby mode this is reduced to 75 µW typ . The part isavailable in a 44-terminal plastic quad flatpack (PQFP) and a44-lead plastic leaded chip carrier (PLCC).

Product Features

Fast 12-Bit ADC with 1.6 s Conversion Time

Eight Single-Ended Analog Input Channels

Overvoltage Protection on Each Channel

Selection of Input Ranges:

5 V, 10 V for AD7891-1

0 to +2.5 V, 0 to +5 V, 2.5 V for AD7891-2

Parallel and Serial Interface

On-Chip Track/Hold Amplifier

On-Chip Reference

Single Supply, Low Power Operation (85 mW max)

Power-Down Mode (75 W typ)

Product Applications

Data Acquisition Systems

Motor Control

Mobile Communication Base Stations

Instrumentation

Product Photos

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