AD7891ASZ-2 Multiplexed A/D Converters by Analog Devices

Multiplexed A/D Converters
Status: Production
Series: AD7891
RoHS: Compliant
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The AD7891 is an 8-channel, 12-bit data acquisition system with a choice of either parallel or serial interface structure. The part contains an input multiplexer, an on-chip track/hold amplifier, a high speed 12-bit ADC, a 2.5 V reference, and a high speed interface. The part operates from a single 5 V supply and 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 or serial interface structure determined by the MODE pin. The part has standard control inputs and fast data access times for both the serial and parallel interfaces, ensuring easy interfacing to modern microprocessors, microcontrollers, and digital signal processors.In addition to the traditional dc accuracy specifications, such as linearity, full-scale and offset errors, the part is also specified for dynamic performance parameters, including harmonic distortion and signal-to-noise ratio.Power dissipation in normal mode is 82 mW typical; in the standby mode, this is reduced to 75 mW typ. The part is available in a 44-terminal MQFP and a 44-lead PLCC.PRODUCT HIGHLIGHTS The AD7891 is a complete monolithic 12-bit data acquisition system that combines an 8-channel multiplexer, 12-bit ADC, 2.5 V reference, and track/hold amplifier on a single chip. The AD7891-2 features a conversion time of 1.6 ms and an acquisition time of 0.4 ms. This allows a sample rate of 500 kSPS when sampling one channel and 62.5 kSPS when channel hopping. These sample rates can be achieved using either a software or hardware convert start. The AD7891-1 has an acquisition time of 0.6 ms when using a hardware convert start and an acquisition time of 0.7 ms when using a software convert start. These acquisition times allow sample rates of 454.5 kSPS and 435 kSPS, respectively, for hardware and software convert start. Each channel on the AD7891 has overvoltage protection. This means an overvoltage on an unselected channel does not affect the conversion on a selected channel. The AD7891-1 can withstand overvoltages of ±17 V.

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Prices starting from US$23.23

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Features

Fast 12-Bit ADC with 1.6 µs Conversion Time
8 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 (100 mW Max)
Power-Down Mode (75 µW Typ)

Last 6 months Inventory & Pricing History

Alternative Descriptions

Adc, 12Bit, 500Ksps, Mqfp-44 | Newark Electronics
ADC, 12BIT, 500KSPS, MQFP-44 | element14
8-Channel Single ADC SAR 500ksps 12-bit Parallel/Serial 44-Pin MQFP Tray | Richardson RFPD
8 CHANNEL, 12-BIT ADC I.C. | Analog Devices

Frequently Asked Questions

Where can I find additional details, specifications and documents for a AD7891ASZ-2?

Additional datasheets, footprints and schematics for AD7891ASZ-2 are listed on our Part Details page. You can also find images and similar parts to AD7891ASZ-2 on this page.

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What category does AD7891ASZ-2 fall under?

The AD7891ASZ-2 is listed under Multiplexed A/D Converters.

Can I view similar or alternative parts?

You can view similar parts to AD7891ASZ-2 when available in the Multiplexed A/D Converters range under the specifications section at the bottom of the details page.

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Is the AD7891ASZ-2 RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Analog Devices.

Which authorised distributors for AD7891ASZ-2 have stock available?

Authorised distributors including Newark Electronics, element14, Richardson RFPD, Analog Devices and Farnell have stock available or on a lead time for AD7891ASZ-2.

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