UG-1042
Easy to Use AD4000 Series 16-/18-/20-Bit Precision SAR ADCs User Guide
Rev. E | Page 10 of 25
14
981
-050
Figure 19.
Save As
Dialog Box
The
Edit
menu (Label 1 in Figure 18) provides the option to
reset the software to its initial state (
Reinitialize to Default
Values
).
The
Help
menu (Label 1 in Figure 18) offers information about the
following:
Analog Devices Website
User Guide
Context Help
About
When hardware is connected to the USB port, the software
automatically detects which generic is connected and displays it
(Label 2 in Figure 18).
The
Throughput
box is Label 3 in Figure 18. The default value
is the maximum sample rate that the active device can support
without turbo mode enabled. The maximum supported
throughput of 2 MSPS (or 1.8 MSPS for the
AD4020
) can only
be achieved by enabling turbo mode (Label 11 in Figure 18).
If the user enters a value larger than the ability of the existing
device, the software reverts to the maximum throughput. The
user can adjust the throughput to a minimum of 10 kSPS.
The
Voltage Reference
dropdown menu is Label 4 in Figure 18. By
default, this reference is 5 V (
ADR4550
on-board reference). The
minimum/maximum voltage calculations are based on this
reference voltage. If the user changes the reference voltage, this
input must be changed accordingly.
Click
Single Capture
to perform a single capture and click
Continuous Capture
to perform a continuous stream capture
from the ADC. (Both are noted with Label 5 in Figure 18.)
Select
Samples
(Label 6 in Figure 18) to analyze data using the
particular number of samples. The maximum number of samples
the software can support is 524,288.
Four capture tabs (Label 7 in Figure 18) display the data in
different formats, as follows:
Waveform
Histogram
FFT
Summary
Click
Enable Status Bits
(Label 8 in Figure 18) to enable the
content of status header. Status bits can be clocked out at the end
of the conversion data using six extra clocks when it is enabled.
Click
Span Compression
(Label 9 in Figure 18) to enable the
ADC span compression feature. In single-supply applications,
the use of span compression increases the headroom and
footroom available to the ADC driver by reducing the input
range by 10% from the top and bottom of the range while still
accessing all available ADC codes.
Click
High-Z Mode
(Label 10 in Figure 18) to enable
the internal
high-Z mode. Enabling this mode allows the low input current
for the ADC and improves total harmonic distortion (THD)
performance using low power/bandwidth precision ADC
drivers for slow/dc type signals.
Click
Turbo Mode
(Label 11 in Figure 18) to enable turbo mode
and run the ADC at the full throughput of 2 MSPS.
Click
Read Register
(Label 12 in Figure 18) to check if any of the
ease of use features are enabled, including span compression,
high-Z mode, turbo mode, an overvoltage condition (which is a
sticky bit), and the status bits.
Clicking
Enable Status Bits
enables the six status bits, and the
content of the six bits is updated and displayed in the
Status
Header
section (Label 13 in Figure 18) after clicking single or
continuous capture. Note that the overvoltage clamp flag status
bit updates on a per conversion basis.
When the
Busy
indicator (Label 14 in Figure 18) is lit, the user
must wait until the software completes the data analysis.
This software allows the user to select the
Oversampling Ratio
(Label 15 in Figure 18) up to 256 from the dropdown menu
located in the
Configure
tab. The oversampling capability is
implemented in the evaluation software by averaging the ADC
output samples, that is, by summing the number of ADC
samples and dividing it by the oversampling ratio to obtain the
increased dynamic range.
To exit the software, click
File
>
Exit
.
Within any of the chart panels, the tools shown in Table 4 allow
user control of the different chart displays.
Table 4. Graphical User Interface (GUI) Tools
Symbol Description
This tool controls the cursor, if present.
This tool zooms in and out.
This tool is used for panning.
The evaluation software allows the user to export the raw data
or image. Right clicking any of the four capture tabs (
Waveform
,
Histogram
,
FFT
, and
Summary
) open the menu as shown in
Figure 20, and the user can either export the raw data in Excel
format or save an image in .bmp, .eps, or .emf format.
