MAX5774EVKIT+ Maxim Integrated Products, MAX5774EVKIT+ Datasheet - Page 5

• Manufacturer Part Number: MAX5774EVKIT+
• Description: KIT EVAL FOR MAX5774
• Manufacturer: Maxim Integrated Products

Specifications of MAX5774EVKIT+

• Number Of Dac's: 32
• Number Of Bits: 14
• Outputs And Type: 32, Single Ended
• Data Interface: Serial
• Settling Time: 20µs
• Dac Type: Voltage
• Voltage Supply Source: Analog and Digital
• Operating Temperature: 0°C ~ 85°C
• Utilized Ic / Part: MAX5774
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The user can exit the software using the File | Exit
menu item. Select the Options | Demo Mode menu
item to exit or enter demo mode. When in demo mode,
all software communication to the EV kit hardware is
disabled and most of the software’s GUI is functional.
This feature enables a user to evaluate the software
without hardware connectivity. The Help menu item
provides help and additional information about the EV
kit software.
Select the desired channel(s) from the Active Channel
combo box in the Channel Configuration group box or
by clicking a channel name in the software’s IC register
table beneath. A single channel (0–31), pair of chan-
nels, all channels, and the offset channel are selec-
table.
The MAC-bypass Input Code, Gain Register Code,
Offset Register Code, and Input Register Code spin
boxes accept 14-bit hexadecimal data (range:
0x0000–0x3FFF) and 14-bit decimal data (range:
0–16383). After updating spin-box data, press the key-
board’s Enter key or exit the spin box to write data to
the output DAC, input, gain, or offset register(s),
respectively. The spin-box up/down arrow keys update
the spin-box data and write data to the IC simultane-
ously. The number displayed to the right of the spin box
is the hexadecimal equivalent of data written to the IC.
Press the Load DAC button to load the output DAC
register(s) with the input register code(s) calibrated
with the gain and offset register codes for the selected
channel(s). The MAC-bypass Input Code spin box
loads data directly into the output DAC register(s), does
not modify the input register(s), and bypasses gain and
offset calibration for the selected channel(s).
The voltage for the 32 DACs is given by the following
equation:
where GAIN = 10/3 for the MAX5774, V
ence voltage (3V by default), V
sense voltage (0V by default), and DAC code = output
DAC register code.
V
edit box, which accepts a 2.9V to 3.1V unconnected
point value. After updating the edit-box value, press the
keyboard’s Enter key or exit the edit box to update the
software’s reference-voltage value.
REF
V
OUT
can be modified using the Reference Voltage
=
GAIN V
×
REF
_______________________________________________________________________________________
×
(
DAC Code Offset DAC Code
2
14
−
GS
DAC Registers
= is the ground-
REF
= the refer-
)
+
V
G G S
MAX5774 Evaluation Kit
In the Channel Configuration group box, press the
Read DAC, Read Gain, Read Offset, or Read Input
button to read the active channel’s output DAC, gain,
offset, or input register, respectively. The number dis-
played to the right of the button is the hexadecimal
equivalent of data read. Note: Only a single channel
(0–31) or the offset channel registers can be read.
Channel pair and all channel selections are write only.
Reset the MAX5774 to its power-up state, where all reg-
ister codes are 0x0000, by using one of the following:
1) Hardware reset (RESET pin):
2) Software reset:
Lastly, press the Default button in the main window to
set the MAX5774 to its default configuration.
The configuration register controls the operating mode of
the MAX5774, and communicates the status during a read
command. Use the SING, GLT, DT, and SHDN combo
boxes to select the configuration. Press the Write button
to actually write to the configuration register. Press the
Read button to read the configuration register. Refer to
the Configuration Register section in the MAX5773/
MAX5774/MAX5775 IC data sheet for more details.
The MAX5774 features a load DAC (LDAC) pin. Toggle
this pin by pressing the /LDAC Toggle button in the
DAC Pins group box to cause all DAC outputs to
update simultaneously.
The MAX5774 also features a clear (RESET) pin. Drive
this pin by pressing the /RESET Toggle button in the
DAC Pins group box to set all the channels to 0V, the
offset to 0V, and the input and DAC registers to 0 code.
There are two methods for communicating with the
MAX5774, through the normal user-interface panel or
through the SPI commands available by selecting the
Options | Interface (Advanced Users) menu item. A
window is displayed that executes an SPI read/write
operation (Figure 2).
a) Press the RESET Toggle button in the DAC Pins
a) Select “1” from the SING combo box in the
b) Press the Write button in the Configuration
c) Press the DAC RESET button in the main window.
group box.
Configuration Register group box.
Register group box.
Configuration Register
Simple SPI Commands
LDAC and RESET Pins
Read Registers
DAC RESET
5