AD652
Rev. C | Page 24 of 28
BRIDGE TRANSDUCER INTERFACE
The circuit of Figure 38 illustrates a simple interface between
the AD652 and a bridge-type transducer. The AD652 is an ideal
choice because its buffered 5 V reference can be used as the
bridge excitation, thereby ratiometrically eliminating the gain
drift related errors. This reference provides a minimum of
10 mA of external current, which is adequate for bridge
resistance of 600 & and above. If, for example, the bridge
resistance is 120 & or 350 &, an external pull-up resistor (R
PU
) is
required. R
PU
and can be calculated using the following formula:
mA
10
V
5
V
5
(max)
+
=
BRIDGE
S
PU
R
V
R
An instrumentation amplifier is used to condition the bridge
signal before presenting it to the SVFC. With its high CMRR,
the AD652 minimizes common-mode errors and can be set to
arbitrary gains between 1 and 10,000 via three resistors,
simplifying the scaling for the parts calibrated 10 V input range.
These resistors should be selected such that the following
equation holds:
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
+
=
1
2
V
10
G
F
BRIDGE
R
R
V
where 10 k& d RF d 20 k&, and VBRIDGE is the maximum output
voltage of the bridge.
The bridge output may be unipolar, as is the case for most
pressure transducers, or it may be bipolar as in some strain
measurements. If the signal is unipolar, the reference input of
the AD625 (Pin 7) is simply grounded. If the bridge has a
bipolar output, however, the AD652 reference can be tied to
Pin 7, thereby, converting a 5 V signal (after gain) into a 0 V to
+10 V input for the SVFC.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
ONE
SHOT
AND
"D"
FLOP
Q CK
D
Q
1mA
20k&
AD652
SYNCHRONOUS
VOLTAGE-TO-
FREQUENCY
CONVERTER
5V
REFERENCE
9
8
11
7
10
1
5
2
15
12
16
AD625
R
BRIDGE
V
BRIDGE
+
R
F
R
G
R
F
+15V
15V
1
2
S1
+15V
CLOCK IN
FREQ
OUT
+15V
V
LOGIC
R
L
R
PU
15V
C
INT
NOTES
1.R
F
SHOULD BE BETWEEN 10k& AND 20k&.
2.R
PU
NEEDED IF R
BRIDGE
600&
3.S1 IN POSITION 1 FOR UNIPOLAR SIGNALS
AND POSITION 2 FOR BIPOLAR SIGNALS.
F
OUT
=V
BRIDGE
F
CLOCK
2
10V
+ 1
2R
F
R
G
Figure 38. Bridge Transducer Interface
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