AD7194Production
The AD7194 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog...
Datasheet AD7194 on Analog.com
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AD7192Production
The AD7192 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog...
Datasheet AD7192 on Analog.com
Associated Drivers
AD7195Recommended for New Designs
The AD7195 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog...
Datasheet AD7195 on Analog.com
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AD7190Production
The AD7190 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog...
Datasheet AD7190 on Analog.com
Associated Drivers
AD7191Production
The AD7191 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) ADC...
Datasheet AD7191 on Analog.com
AD7193Production
The AD7193 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog...
Datasheet AD7193 on Analog.com
The user asked how to interface multiple AD719x ADCs over a single serial interface. The solution involves using a decoder to control the /CS (chip select) lines of the ADCs, ensuring only one ADC drives the DOUT line at a time. The AD719x can be synchronized using the SYNC pin to manage the /RDY signals, allowing data to be read from all ADCs without loss, provided the microcontroller can read data quickly enough without violating the 5 MHz SCLK frequency limit. For channel switching, refer to application note AN-1084.
AI Generated Content
How do I interface to multiple AD719x ADCs over the same serial interface ?
Yes that is correct - there is a maximum time between the /RDY going low and reading the data before it is lost. The data must be read a small time before the next /RDY signal. This is because /RDY goes high to indicate that a new conversion is about to complete and the data register will be updated shortly. This time is determined by the output data rate.
The best way to ensure that no data is lost when using multiple ADCs is to synchronise the ADCs using the SYNC pin. The /RDY signal for all ADCs will then go low at the same time and you can cycle between all ADCs reading the data. As long as you can read the data from all ADCs quickly enough and without violating the maximum SCLK frequency spec then you will not lose any data. This depends on what speed you wish to operate the ADC.
It should be noted that the AD719x can quickly multiplex the input channels to the ADC and so it would be possible that instead of slowly sampling multiple channels using multiple ADCs you could use a single ADC and quickly multiplex the inputs. There are tradeoffs to this approach but it may be a suitable option depending on your application.
Yes that is correct - there is a maximum time between the /RDY going low and reading the data before it is lost. The data must be read a small time before the next /RDY signal. This is because /RDY goes high to indicate that a new conversion is about to complete and the data register will be updated shortly. This time is determined by the output data rate.
The best way to ensure that no data is lost when using multiple ADCs is to synchronise the ADCs using the SYNC pin. The /RDY signal for all ADCs will then go low at the same time and you can cycle between all ADCs reading the data. As long as you can read the data from all ADCs quickly enough and without violating the maximum SCLK frequency spec then you will not lose any data. This depends on what speed you wish to operate the ADC.
It should be noted that the AD719x can quickly multiplex the input channels to the ADC and so it would be possible that instead of slowly sampling multiple channels using multiple ADCs you could use a single ADC and quickly multiplex the inputs. There are tradeoffs to this approach but it may be a suitable option depending on your application.
