UG-896
AD8556-EVALZ/AD8556CP-EBZ User Guide
Rev. A | Page 6 of 9
Table 1. Evaluation Software Dialog Box Button Functions
Button Function
Start
Select the connector and the product, and then click
Start
to begin evaluation.
Connector
Selects the physical connector on the SDP board that is used to connect to the evaluation board. The connectors are
labeled on the top silkscreen of the SDP board.
Product
Selects the device under evaluation.
Simulate
Configures the device according to the specified pattern. This button does not blow any fuses.
Program
Blows fuses according to the specified pattern. Blown fuses cannot be reprogrammed.
Blow Parity Fuse
Blows the parity fuse. The parity fuse keeps track of the state of the blown fuses. If, for any reason, the state of this fuse
is changed either intentionally or unintentionally, the parity flag is set and the alarm is set.
Blow Master Fuse
Permanently sets the device to the programmed gain and offset and prevents future programming. Click this button
only after selecting and programming the gain and the offset. Prior to blowing the master fuse, make sure to first
blow the parity fuse, if prompted.
Read Fuse Values
Reads back the state of the programmed fuses after they have been blown. The options are as follows:
Low sense current: when dropped across a blown fuse (high impedance), creates a voltage that can trigger an internal
comparator and provide the right level in the output.
High sense current: reads back the fuse states to make sure that the fuses are blown. A code for blown fuses appears
in a pop-up box.
See the
data sheet for more
information on the theory of operation; simulation,
programming, and read modes; and parity error detection.
The
information on programming procedures for the device.
TYPICAL AC SETUP AND RESPONSE
AC Input Example
Setup requirements are as follows:
Power supplies
Function generator
Scope
BNCs and cables
Results
When the device is powered with ±2.5 V, and 50 mV of input is
applied, the default conditions are
V
CC
= 2.5 V
V
SS
= −2.5 V
Gain 1 = 4
Gain 2 = 17.5
Offset = V
SS
The overall gain is 70.
When the switches are placed in V
NEG
P1 and V
POS
P2, there is one
set of outputs. When the switches are changed to V
NEG
P2 and
V
POS
P1, the exact voltage is produced, but with the opposite
polarity.
When both switches are on one side (for example, V
NEG
P1 and
V
POS
P1), the inputs are shorted together.
RT0 and RT1 are the trim potentiometers used for pulse width
shaping. Do not change their settings. RT0 is adjusted to create
a 5 μs pulse; RT1 is adjusted to create an 80 μs pulse.
Figure 4 shows the output on Channel 2 under these conditions
and configuration.
T
1
2
[
]
T
Ch1
Ch2
M
A
50.0mV
BW
2.00V
BW
Ch1
2.00mV
400ms
T
9.600%
11
88
6-
0
0
3
Figure 4. Output on Channel 2
Figure 5 shows the results of the previous conditions with
V
OFF
= 2.5 V or Code 128.
T
1
2
[
]
T
Ch1
Ch2
M
A
50.0mV
BW
2.00V
BW
Ch1
2.00mV
400ms
T
9.600%
11
88
6-
004
Figure 5. Output on Channel 2, V
OFF
= 2.5 V
