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AD883B Scheda tecnica(PDF) 7 Page - Analog Devices

Il numero della parte AD883B
Spiegazioni elettronici  Real-Time Analog Computational Unit ACU
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD883B Scheda tecnica(HTML) 7 Page - Analog Devices

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AD538
–7–
REV. C
STABILITY PRECAUTIONS
At higher frequencies, the multistaged signal path of the AD538,
as illustrated in Figure 10, can result in large phase shifts. If a
condition of high incremental gain exists along that path (e.g.,
VO = VY
× V
Z /VX = 10 V
× 10 mV/10 mV = 10 V so that
∆V
O /
∆V
X = 1000), then small amounts of capacitive feedback
from VO to the current inputs IZ or IX can result in instability.
Appropriate care should be exercised in board layout to pre-
vent capacitive feedback mechanisms under these conditions.
LOGe
IY
VY
Ln Y
LOGe
IZ
VZ
Ln Z
LOGe
IX
VX
Ln X
0.2 M 5
BUFFER
+
++
Ln Z – Ln X
M(Ln Z – Ln X)
M(Ln Z – Ln X) +Ln Y
VO = VY
VZ
VX
M
ANTILOGe
Figure 10. Model Circuit
USING THE VOLTAGE REFERENCES
A stable bandgap voltage reference for scaling is included in the
AD538. It is laser-trimmed to provide a selectable voltage out-
put of +10 V buffered (Pin 4), +2 V unbuffered (Pin 5) or any
voltages between +2 V and +10.2 V buffered as shown in Figure
11. The output impedance at Pin 5 is approximately 5 k
Ω. Note
that any loading of this pin will produce an error in the +10 V
reference voltage. External loads on the +2 V output should be
greater than 500 k
Ω to maintain errors less than 1%.
25k
25k
LOG
RATIO
100
25k
25k
ANTILOG
LOG
OUTPUT
100
AD538
INTERNAL
VOLTAGE
REFERENCE
I
VO
IZ
VZ
B
REF OUT
–VS
+VS
+2V
IY
A
D
IX
VX
C
PWR
GND
SIGNAL
GND
VY
118
17
16
15
14
13
12
11
10
2
3
4
5
6
7
8
9
50k
11.5k
+2V TO +10.2V
BUFFERED
Figure 11. +2 V to +10.2 V Adjustable Reference
In situations not requiring both reference levels, the +2 V output
can be converted to a buffered output by tying Pins 4 and 5
together. If both references are required simultaneously, the
+10 V output should be used directly and the +2 V output
should be externally buffered.
ONE-QUADRANT MULTIPLICATION/DIVISION
Figure 12 shows how the AD538 may be easily configured as a
precision one-quadrant multiplier/divider. The transfer function
VOUT = VY (VZ /VX) allows “three” independent input variables,
a calculation not available with a conventional multiplier. In
addition, the 1000:1 (i.e., 10 mV to 10 V) input dynamic range
of the AD538 greatly exceeds that of analog multipliers comput-
ing one-quadrant multiplication and division.
25k
25k
LOG
RATIO
100
25k
25k
ANTILOG
LOG
OUTPUT
100
AD538
INTERNAL
VOLTAGE
REFERENCE
I
VO
IZ
VZ
B
+10V
+2V
IY
A
D
IX
VX
C
PWR
GND
SIGNAL
GND
VY
1
18
17
16
15
14
13
12
11
10
2
3
4
5
6
7
8
9
VZ
INPUT
+15V
–15V
OUTPUT
VX
INPUT
VY
INPUT
IN4148
VOUT = VY (
)
VZ
VX
Figure 12. One-Quadrant Combination Multiplier/Divider
By simply connecting the input VX (Pin 15) to the +10 V refer-
ence (Pin 4), and tying the log-ratio output at B to the antilog
input at C, the AD538 can be configured as a one-quadrant
analog multiplier with 10-volt scaling. If 2-volt scaling is desired,
VX can be tied to the +2 V reference.
When the input VX is tied to the +10 V reference terminal, the
multiplier transfer function becomes:
V
O = VY
V
Z
10 V


As a multiplier, this circuit provides a typical bandwidth of
400 kHz with values of VX, VY or VZ varying over a 100:1 range
(i.e., 100 mV to 10 V). The maximum error with a 100 mV to
10 V range for the two input variables will typically be +0.5% of
reading. Using the optional Z offset trim scheme, as shown in
Figure 13, this error can be reduced to +0.25% of reading.
By using the +10 V reference as the VY input, the circuit of
Figure 12 is configured as a one-quadrant divider with a fixed
scale factor. As with the one-quadrant multiplier, the inputs
accept only single (positive) polarity signals. The output of the
one-quadrant divider with a +10 V scale factor is:
V
O = 10V
V
Z
V
X


The typical bandwidth of this circuit is 370 kHz with 1 V to
10 V denominator input levels. At lower amplitudes, the band-
width gradually decreases to approximately 200 kHz at the
2 mV input level.


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