EVAL-AD7992_15 Datasheet, PDF (6/12 Pages) Analog Devices – Evaluation Board for the 2-Channel, 12-Bit ADC with I2C-Compatible Interface

EVAL-AD7992
The upper portion of the evaluation board window contains
a menu bar and controls. The middle and bottom portions
contain digital storage oscilloscopes (DSOs).
Menu Bar
The menu bar (not visible in Figure 2) consists of the File and
About menus.
File Menu
Exit. Exits the program.
About Menu
The About menu displays information about the current
version of the software.
Controls
The controls include control buttons, list boxes, and indicators.
Exit. Exits the program.
Load Firmware. Loads the firmware to the Cypress USB device.
Sample. Samples selected channels.
Continuous. Repeats the sampling process.
Stop Contin. Stops sampling continuously.
Temperature. Enables temperature measurements.
Limit. Opens window to configure limit registers (Channel 1 only).
Potentiometer Value Selector (Pot 1/Pot 2). Changes the value
of the selected digital potentiometer.
LEDs (CH1, CH2). Selects the input channel of the AD7992.
When more than one channel is selected, the AD7992 works in
sequence mode.
Alert LED. Indicates if an alert occurred (Channel 1 only).
Ref - VDD. Selects an external or internal reference voltage.
2.5V/3V. Changes the value of the external reference voltage.
3.3V/5V. Flip the switch to change the value of the internal
reference voltage (power supply voltage).
Codes/Volts. Determines whether data is displayed in codes
or volts.
Clear Charts. Clears the charts displayed.
Autoscale On/Autoscale Off. Click this button to turn the
autoscale feature on or off.
Alert. Shows limits on the upper digital storage oscilloscope.
Sweep. Starts the sweep function.
Channel 1/Channel 2. Selects the input channel (Channel 1 or
Channel 2) of the AD7992 for the sweep function.
Digital Storage Oscilloscopes
The middle portion of the evaluation board window displays
a waveform. When samples are uploaded from the evaluation
board, they are displayed here. At the bottom left of the upper
DSO are zoom options that allow you to zoom in and out while
viewing a sample. To the right of this DSO, information about
the sample taken and displayed such as measured values in
codes and in volts.
The lower portion of the main window displays a waveform
of the sweep function. At the bottom left of the lower DSO
are zoom options that allow you to zoom in and out while
viewing a sample. To the right of the DSO, information about
the sample taken and the value of each point of sweep function
is displayed.
Taking Samples
During the sweep function, 256 samples are taken directly
from the digital potentiometer output. The output of the digital
potentiometer is incremented by 1, from 0 to 255, and for each
increment, the AD7992 takes a sample. After the measurement,
all 256 values are displayed on the digital storage oscilloscope in
the lower portion of the main window (see Figure 2).
To instruct the AD7992 to take samples, click either Sample or
Continuous.
• Click Sample to perform one conversion. The result is
uploaded and displayed.
• Click Continuous to start taking samples. When
Continuous is clicked, all other controls except Stop
Contin., Pot 1/Pot 2, and Exit are disabled. The value
of the digital potentiometer can be changed while
Continuous mode is selected.
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