MAX1276EVKIT Maxim Integrated, MAX1276EVKIT Datasheet - Page 8

• Manufacturer Part Number: MAX1276EVKIT
• Description: Data Conversion IC Development Tools Evaluation Kit/Evaluation System for the MAX1070/71/72/75#79/MAX1224/25/MAX1274#79
• Manufacturer: Maxim Integrated
• Series: MAX1276, MAX1278r

Specifications of MAX1276EVKIT

• Interface Type: QSPI, Serial (SPI, Microwire)

these values with an oscilloscope, check the Run SPI
Continuously box and monitor the SPI signals on the
test points located near header P1. The Clock Divider
setting sets the SPI clock rate for all readings taken.
The total conversion rate (SPI clock and delay between
conversions) take effect when the Run SPI
Continuously box is checked or when collecting data
for graphing.
The Device Parameters section configures the Maxim
evaluation software for the various devices. Selecting a
Test Device in the drop-down list box sets the resolu-
tion (10 bits or 12 bits) and output coding (unipolar or
bipolar). The operating parameters are displayed
below the selection box. The displayed reference volt-
age can be set to the measured value of VREF for more
accurate readings. The following formulas are used to
calculate the displayed Output Voltage.
Unipolar Mode:
Bipolar Mode:
If sign bit (MSB) is zero:
If sign bit is one:
where Max Code = 4096 for 12-bit resolution or 1024
for 10-bit resolution.
MAX1276 Evaluation Kit/Evaluation System
Figure 3. Sampling Tool Dialog box
8
Output Voltage = (Output Code - Max Code) x (VREF /
Output Voltage = Output Code x (VREF / Max Code)
Output Voltage = Output Code x (VREF / Max Code)
_______________________________________________________________________________________
Max Code)
The displayed output voltage ranges from 0 to 4.095V
in unipolar mode and -2.048V to +2.047V in bipolar
mode (assuming a 12-bit ADC with VREF = 4.096V).
Refer to the device data sheet for more detail on the
difference between unipolar and bipolar output coding.
The Device Power State section displays the present
power state of the MAX1276. The MAX1276 has three
levels of power consumption. During normal operation,
the device is in the active state. Pressing the Power
Down button sends a short 8-bit conversion sequence to
the device, setting it the standby state. In this state,
power consumption is reduced, but the device is ready
for immediate use. Pressing the Power Down button
while the device is in the standby state sends a second
8-bit conversion cycle to set the device in the low-power
state. The device requires 2ms to 5ms settling time when
coming out of the low-power state. Any normal conver-
sion cycle brings the device back to the active state.
Therefore, the Read Every 200ms box must be
unchecked to power down the device. The supply cur-
rents for VLOGIC and AVDD can be measured by
replacing the shunts across JU5 and JU6 with ammeters.
Pressing the Collect Samples button opens a dialog
box for the Maxim sampling tool (see
the user can select the number of samples (1, 2, 4, 4096,
8192 etc.,) to be collected. A box is also provided to
enter a label for the graph. Clicking the Begin Sampling
button starts the data collection and opens a display win-
dow showing the collected data (see
Displaying and Saving Data
Figure
Figure
4).
3). Here,