Datasheet

Evaluating Performance with the ADCPro Software

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7.1.1 Data Rate and Sampling Information

The Data Rate control on the main plug-in window sets the data rate for both ADS1115 converters on the

EVM. It is a requirement of the ADCPro software that both devices operate at the same data rate. The

ADS1115EVM-PDK always operates the device in continuous conversion mode; one-shot power-down

mode is not supported.

The ADS1115EVM-PDK allows the Data Rate control to set the data rate to 8, 16, 32, 64, 128, 250, 475,

or 860 samples per second (SPS). Note that the data rate can go quite low; therefore, if the block size is

large, the time it takes to collect a block of data can be quite long. It is advisable to first test collection at

the higher data rates. Once a test is known to work properly, drop down to the lower data rate and allow

sufficient time to collect the data.

The ADS1015EVM-PDK allows the Data Rate control to set the data rate to 128, 256, 500, 920, 1600,

2500, or 3300 SPS. The MMB3 does not have the capability to send every sample at data rates above

920 SPS; when a data rate higher than this is selected, the data points collected will not be continuous.

The ADS1015 will operate at the higher data rate, but data will be collected at 920 SPS, skipping some

data points.

Note that both the ADS1115 and ADS1015 have internal clocks with a ±10% accuracy. If performing FFT

tests, frequencies may appear to be incorrect as a result of this tolerance range. At data rates above 920

SPS, the sample rate reported to test plug-ins will be 920 SPS so that FFT tests should run properly.

The ADS1115EVM-PDK plug-in has a tabbed interface, with two different tabs to control the other

functions of the two ADS1115s on the EVM. These tabs are described below.

ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B–August 2009–Revised May 2011

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