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EVAL-AD7992EBZ

P1-P3P4-P6P7-P9P10-P12
EVAL-AD7992
Rev. A | Page 4 of 12
LINK OPTIONS
Eight link options can be set to change the configuration of the circuits. The functions of these link options are summarized in Table 2.
The positions of the links can be changed when the evaluation board is connected to the power supply.
Table 2.
Link No. Function
LK1 LK1 connects the input of V
IN
1 to the AN0 input socket, to a digital potentiometer, or to a temperature sensor.
In Position A, V
IN
1 is connected to the digital potentiometer.
In Position B, V
IN
1 is connected to the AN0 input socket.
In Position C, V
IN
1 is connected to the temperature sensor.
LK2, LK5
LK2 and LK5 connect the power supply pins of the operational amplifiers to 3.6 V regulated output from the on-board
ADP3330 voltage regulators, or to 5 V supply from J1.
In Position A, an operational amplifier is supplied from J1.
In Position B, an operational amplifier is supplied from ADP3330.
LK3, LK6 LK3 and LK6 tie the operational amplifiers to the analog inputs of the AD7992.
In Position A, the operational amplifier is used.
In Position B, the operational amplifier is not used.
LK4 LK4 connects the input of V
IN
2 to the AN1 input socket, to a digital potentiometer or to a high precision reference voltage.
In Position A, V
IN
2 is connected to a digital potentiometer.
In Position B, V
IN
2 is connected to the AN1 input socket.
In Position C, Channel 2 is used as external reference input for the AD7992.
LK7 LK7 selects the power source for V
DD
on the AD7992.
In Position A, LK7 selects the 5 V supply from the USB connector.
In Position B, LK7 selects the 3.3 V regulated output from the on-board ADP3303 voltage regulator.
LK8 LK8 changes the value of the external reference voltage.
If a link is inserted, the reference voltage is 3 V.
If a link is not inserted, the reference voltage is 2.5 V.
SOCKETS
There are four input sockets relevant to the operation of the
AD7992 on this evaluation board. The functions of these
sockets are outlined in Table 3.
Table 3. Socket Functions
Socket Function
AN0 Subminiature BNC (SMB) Connector. The analog input
signal for the V
IN
1 of the AD7992 is applied to this socket.
AN1 Subminiature BNC (SMB) Connector. The analog input
signal for the V
IN
2 of the AD7992 is applied to this socket.
J2 Subminiature BNC (SMB) Connector. This socket is
connected to the SDA track on the evaluation board.
J3 Subminiature BNC (SMB) Connector. This socket is
connected to the SCL track on the evaluation board.
USB CONNECTOR
A standard USB connector, J1, is used to connect the evaluation
board to the USB port of a PC. A standard USB connector cable
is included with the AD7992 evaluation board kit. Because the
USB connector powers the board, there is no need for an external
power supply.
Communication between the AD7992 evaluation board and
the PC is over the USB interface. The on-board USB controller
controls this communication.
EVAL-AD7992
Rev. A | Page 5 of 12
EVALUATION BOARD SOFTWARE
INSTALLING THE SOFTWARE
Included in the EVAL-AD7992 kit is a CD that contains
software for controlling and evaluating the functionality of
the AD7992.
When the CD is inserted into the PC, an installation program
automatically begins. This program installs the evaluation
software as well as electronic versions of the evaluation board
data sheet and the AD7992 device data sheet. All literature on
the CD is in the Adobe® Systems, Inc., portable documentation
format (PDF) and requires Acrobat Reader® to be viewed or
printed. The user interface on the PC is a dedicated program
written especially for the AD7992.
Connect the evaluation board to the PC when the installation
process is finished.
USING THE MAIN WINDOW
The software that controls the AD7992 consists of one window
shown in Figure 2. This window, which appears when the
software is run, allows you to display and read samples from
the evaluation board.
06266-002
Figure 2. AD7992 Evaluation Board Window
EVAL-AD7992
Rev. A | Page 6 of 12
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.
Te m p e r a t u r e . 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 i nst r uc t t he 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.
P1-P3P4-P6P7-P9P10-P12

EVAL-AD7992EBZ

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Manufacturer:
Analog Devices Inc.
Description:
Data Conversion IC Development Tools EVAL BRD AD7992
Lifecycle:
New from this manufacturer.
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