A data-acquisition system on a chip




Multifunction data-acquisition systems have been around for a long time as stand-alone instruments, plug-in cards, cabled computer peripherals, and embedded in systems. Such systems are often designed with separate ADCs, DACs, and digital I/O devices. Many microcontrollers include ADCs and DACs, but that locks you into using that device. The AD5592R from Analog Devices combines all of these I/O functions, letting you use one chip to design measurement-and-control functions into systems.

A data-acquisition system on a chip




Programmable through its SPI bus interface, the AD5592R contains eight 12-bit, successive-approximation ADCs, eight 12-bit DACs, a 2.5-V voltage reference, and eight digital I/O ports. The AD5592R also contains an internal temperature sensor that can measure from -40°C to +105°C, the device’s operating range. Each of the AD5592R’s eight I/O pins is configurable as an ADC, DAC, or digital I/O channel. Therefore, your application is limited to those eight channels, but in any combination. Building a data-acquisition system means you just need to add input-signal conditioning, output drivers, power, and communications to a microprocessor or FPGA.

ADC throughput rate is 400 ksamples/s, so you must divide that rate by the number of analog-input channels used to get the maximum per-channel sample rate. Each conversion takes 2 µs to complete. When configured as a DAC, each channel can drive a load capacitance up to 2 nF in parallel with 1 kΩ. In digital I/O mode, each channel can be configured as a general-purpose digital I/O line for detecting digital sensors or driving devices such a s relays to power transistors. Each channel is also configurable for digital logic inputs or outputs. You can program the device’s multiplexer for any channel sequence.

READ  TI intros its lowest noise octal 12-bit ADC

For More Details: A data-acquisition system on a chip




Clip to Evernote

Leave a Comment

(Spamcheck Enabled)

Read previous post:
Arduino Yun SBC adds Wifi and Linux to Leonardo features

[Updated Sep 30] — Arduino announced the first open source Arduino hacker board with built-in WiFi, and also the first...

Close
Scroll to top