Analog Devices AD5252 Evaluation Board EVAL-AD5252SDZ EVAL-AD5252SDZ Ficha De Dados
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EVAL-AD5252SDZ
Evaluation Board User Guide
UG-274
Rev. 0 | Page 5 of 16
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.
attenuation. To do so, adjust the R36 resistor until a desirable
transfer function is found.
Signal Amplifier
RDAC3 can be operated as an inverting or noninverting signal
amplifier supporting linear or pseudologarithmic gains. Table 6
shows the available configurations.
amplifier supporting linear or pseudologarithmic gains. Table 6
shows the available configurations.
Table 6. Amplifier Selection Link Options
Amplifier
Gain
Link
Label
Noninverting Linear
A27
LINEAR
A29
NON-INVERTING
A30
NON-INVERTING
Pseudologarithmic
A27
PSEUDOLOG
A29
NON-INVERTING
A30
NON-INVERTING
Inverting
Linear
A27
LINEAR
A29
INVERTING
A30
INVERTING
Pseudologarithmic
A27
PSEUDOLOG
A29
INVERTING
A30
INVERTING
The noninverting amplifier with linear gain is shown in Figure 4,
and the gain is defined in Equation 3.
and the gain is defined in Equation 3.
R38
R
G
WB3
+
=1
(3)
where R
WB3
is the resistor between the W3 and B3 terminals.
V
IN
RDAC3
B3
R42
W3
B2
W2
V
OUT
OAVOUT
C1
10nF
R41
1.7k
Ω
R38
2.7k
Ω
09820-
004
Figure 4. Linear Noninverting Amplifier
The noninverting amplifier with pseudologarithmic gain is
shown in Figure 5, and the gain is defined in Equation 4.
shown in Figure 5, and the gain is defined in Equation 4.
AW3
WB3
R
R
G
+
= 1
(4)
where:
R
WB3
is the resistor between the W3 and B3 terminals.
R
AW3
is the resistor between the A3 and W3 terminals.
V
IN
RDAC3
B3
A3
R42
W3
B2
W2
V
OUT
OAVOUT
A2
C1
10nF
R41
1.7k
Ω
R43
09820-
005
Figure 5. Pseudologarithmic Noninverting Amplifier
R43 and R42 can be used to set the maximum and minimum
gain limits.
The inverting amplifier with linear gain is shown in Figure 6,
and the gain is defined in Equation 5.
gain limits.
The inverting amplifier with linear gain is shown in Figure 6,
and the gain is defined in Equation 5.
R38
R
G
WB3
−
=
(5)
where R
WB3
is the resistor between the W3 and B3 terminals.
V
IN
RDAC3
B3
R42
W3
B2
W2
V
OUT
OAVOUT
C1
10nF
R41
1.7k
Ω
R38
2.7k
Ω
09820-
006
Figure 6. Linear Inverting Amplifier
The inverting amplifier with pseudologarithmic gain is shown
in Figure 7, and the gain is defined in Equation 6.
in Figure 7, and the gain is defined in Equation 6.
AW3
WB3
R
R
G −
=
(6)
where:
R
WB3
is the resistor between the W3 and B3 terminals.
R
AW3
is the resistor between the A3 and W3 terminals.
V
IN
RDAC3
B3
A3
R42
W3
B2
W2
V
OUT
OAVOUT
A2
C1
10nF
R41
1.7k
Ω
R43
09820-
007
Figure 7. Pseudologarithmic Inverting Amplifier
R43 and R42 can be used to set the maximum and minimum
gain limits.
gain limits.