Functional Block Diagram And Description - Analog Devices EVAL-AD5679RSDZ User Manual

UG-1463

FUNCTIONAL BLOCK DIAGRAM AND DESCRIPTION

The EVAL-AD5679RSDZ software is organized to appear
similarly to the functional block diagram shown in the
AD5679R data sheet, which simplifies correlating the functions
on the EVAL-AD5679RSDZ with the description in the
AD5679R data sheet.
J
Table 1. Block Diagram Functions (See Figure 4)
Label Button/Function Name
A CONFIGURATION
wizard
B LDAC and RESET (GPIO
buttons)
C Select a Command
D Input Register 0
through Input
Register 3
E DAC Register 0 through
DAC Register 3
F Software RESET
G Load DAC
H DAC
I Internal Reference
J Apply Changes
A
Figure 4. AD5679R
Function
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.
Act as external GPIO pulses to the LDAC pin and RESET pin. The LDAC button pushes data from both
input registers (Label D) to the DAC registers (Label E). The RESET button clears all data from input
registers and DAC registers. These buttons are live and there is no need to click Apply Changes (Label J).
Command option dropdown menu selects how the data being transferred to the device affects the
input registers and DAC registers. After a data value is entered in an input register (Label D), this menu
determines if the data is transferred to the input register only, or to the channel input register (Label D)
and the channel DAC register (Label E).
16-bit data word to be transferred to the device. Click Apply Changes (Label J) to transfer this 16-bit
data word to the device.
Displays the value that is currently present in the DAC register on the device. Update the DAC registers
by selecting the appropriate command option or by toggling LDAC (Label B).
Returns the evaluation board and software to default values. This button is live. Therefore, there is no
need to click Apply Changes.
Users can individually control which channel loads the values from the input registers to the DAC register.
DAC configuration options provide access to individual channel configuration options such as power-
down options and hardware LDAC mask enable and disable settings.
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 AD5679R.
Applies all modified values to the device. Note that if an evaluation board is not connected, values
entered in the input registers are not transferred to the DAC registers.
Rev. 0 | Page 4 of 13
EVAL-AD5679RSDZ
For a full description of each block, register, and its settings, see
the AD5679R data sheet.
Some of the blocks and their functions are described in this
section as they pertain to the evaluation board. The full screen
block diagram is shown in Figure 4. Table 1 describes the
functionality of each block.
C
E H
G
F
D
B
Block Diagram with Labels
User Guide
I