Analog Devices EVAL-AD5693RSDZ, Руководство пользователя

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EVAL-AD5693RSDZ User Guide UG-675
Rev. A | Page 5 of 12
BLOCK DIAGRAM AND DESCRIPTION
The EVAL-AD5693RSDZ software is organized to appear
similar to the functional block diagram shown in the AD5693R
data sheet. Therefore, correlating the functions on the EVAL-
AD5693RSDZ evaluation board with the description in the
AD5693R data sheet is simplified.
For a full description of each block, register, and its settings, see
the
AD5693R data sheet.
Some of the blocks and their functions are described in this section
as they pertain to the evaluation board. The block diagram is
shown in Figure 4. Table 1 describes the functionality of each block.
12
145-
1
04
J
A
C I
B F D G E H
Figure 4. AD5693R Block Diagram with Labels
Table 1. Block Diagram Functions (See Labels in Figure 4)
Label Button/Function Name Description
A
CONFIGURATION Wizard Used to set the initial configuration for the board. Select the reference gain case from the Output
Gain dropdown menu. A gain of 1 is the default. After setting up the initial configuration, click Apply to
apply the values. These settings can be modified at any stage while evaluating the board.
B
LDAC and RESET (GPIO
buttons)
Act as external GPIO pulses to the LDAC and RESET pins. The LDAC button transfers data from the input
register (D) to the DAC register (E). The RESET button clears all data from the input register and the
DAC register. These buttons are live; therefore, there is no need to click Apply Changes (J).
C Select a Command Command option dropdown menu selects how the data being transferred to the device affects the
input and DAC registers. After a data value is entered in the input register (D), this menu determines
the internal DAC registers affected by updating the input register (D). After a new value is written in
the input register (D), the data can be transferred to the DAC input register, or to the DAC input
register and the DAC register simultaneously. If the data is transferred to both registers, the channel
DAC register (E) reflects the new value.
D Input register
16-bit data word to be transferred to the device. Click Apply Changes (J) to transfer this 16-bit data
word to the device.
E DAC register Displays the value that is currently present in the DAC register on the device. Update the DAC register
by selecting the appropriate command option or by toggling
LDAC
(B).
F
Software RESET Returns the evaluation board and software to default values. This button is live; therefore, there is no
need to click
Apply Changes (J).
G Load DAC Users can individually control which channel loads the values from the input register to the DAC register.
Note that the
AD5693R is a single-channel DAC and only offers one channel option for the Load DAC
function.
H DAC DAC configuration options provide access to individual channel configuration options such as power-
down options and hardware LDAC mask enable/disable settings.
I Internal Reference Select Enable from this setting to enable the on-chip reference for the evaluation board. If Disable is
selected, an external reference must be applied. This control is only available on the AD5693R .
J Apply Changes Applies all modified values to the device. Note that if an evaluation board is not connected, values
entered into the input register are not transferred to the DAC register.