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UG-243
Evaluation Board User Guide
TEST CIRCUITS
The EVAL-AD5172SDZ incorporates several test circuits to
evaluate the AD5172 performance.
DAC
RDAC1 can be operated as a digital-to-analog converter (DAC),
AC_INPUT
1μF
V DD – V SS
2
AC + DC
AC
RDAC1
A1
R34 A1
W1
W1_BUF
as shown in Figure 2.
W1
BUF_W1
V DD – V SS
AC + DC
B1
R36
2
V DD
VDD
B1
RDAC1
A1
R34 A1
W1
W1_BUF
V DD – V SS
2
DC
GND
R35
V DD – V SS
2
B1
DC
GND
W1
R35
B1
BUF_W1
Figure 3. AC Signal Attenuator.
Depending on the voltage supply rails and the dc offset voltage
of the ac signal, various configurations can be used as described
in Table 5.
Figure 2. DAC
Table 5. AC Signal Attenuation Link Options
Table 4 shows the options available for the voltage references.
Table 4. DAC Voltage References
Link
A20
Options
AC + DC
Conditions
No dc offset voltage.
AC signal is outside the voltage supply rails
Terminal
A1
W1
Link
A20
BUF_W1
Options
AC + DC
VDD
Description
Connects Terminal A1 to
(V DD ? V SS )/2
Connects Terminal A1 to V DD
Connects Terminal W1 to an
A21
AC
DC
GND
due to the dc offset voltage.
DC offset voltage ≠ V DD /2 1 .
All other conditions.
Use in conjunction with ac + dc link.
All other conditions.
B1
A21
DC
output buffer
Connects Terminal B1 to
1
Recommended to ensure optimal total harmonic distortion (THD) performance.
(V DD ? V SS )/2
The signal attenuation is defined in Equation 2.
Attenuatio n ( dB ) = 20 × log ? ?
?
?
GND Connects Terminal B1 to
analog ground
The output voltage is defined in Equation 1.
? R WB1 + R W
? R END ? TO ? END
?
?
(2)
V OUT = ( V A1 ? V B1 ) ×
R WB1
(1)
256
where:
R WB1 is the resistor between the W1 and B1 terminals.
V A1 is the voltage applied to the A1 terminal (A20 link).
V B1 is the voltage applied to the B1 terminal (A21 link)
However, by using the R34 and R35 external resistors, the user
where:
R WB1 is the resistor between the W1 and B1 terminals.
R W is the wiper resistance.
R END-TO-END is the end-to-end resistance value.
In addition, R36 can be used to achieve a pseudologarithmic
attenuation. To do so, adjust the R36 resistor until a desirable
transfer function is found.
can reduce the voltage of the voltage references. In this case, use
the A1 and B1 test points to measure the voltage applied to the
A0 and B0 terminals and recalculate V A0 and V B0 in Equation 1.
AC Signal Attenuation
RDAC1 can be used to attenuate an ac signal, which must be
provided externally using the AC_INPUT connector, as shown
in Figure 3.
Rev. 0 | Page 4 of 16
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