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AD706JR-REEL датащи(PDF) 7 Page - Analog Devices

номер детали AD706JR-REEL
подробное описание детали  Dual Picoampere Input Current Bipolar Op Amp
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домашняя страница  http://www.analog.com
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AD706JR-REEL датащи(HTML) 7 Page - Analog Devices

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AD706
REV. C
–7–
Figure 24 shows an in-amp circuit that has the obvious advan-
tage of requiring only one AD706, rather than three op amps,
with subsequent savings in cost and power consumption. The
transfer function of this circuit (without RG) is:
VOUT = (VIN#1 − VIN#2 )1+
R4
R3


for R1 = R4 and R2 = R3
Input resistance is high, thus permitting the signal source to
have an unbalanced output impedance.
+VS
0.1 F
1k
+
A1
AD706
1/2
RP*
1k
49.9k
R2
R3
R4
VIN#1
RG (OPTIONAL)
R1
49.9k
A2
+
0.1 F
AD706
1/2
OUTPUT
*OPTIONAL INPUT PROTECTION RESISTOR FOR GAINS GREATER
THAN 100 OR INPUT VOLTAGES EXCEEDING THE SUPPLY VOLTAGE.
VOUT = (VIN#1 – VIN#2) (1+
) + (
)
FOR R1 = R4, R2 = R3
R4
R3
2R4
RG
–VS
RP*
VIN#2
3
2
8
1
5
6
7
4
Figure 24. A Two Op-Amp Instrumentation Amplifier
Furthermore, the circuit gain may be fine trimmed using an
optional trim resistor, RG. Like the three op-amp circuit, CMR
Figure 23a. Unity Gain Inverter Connection
Figure 23b. Unity Gain Inverter Large
Signal Pulse Response, CL = 1,000 pF
Figure 23c. Unity Gain Inverter Small
Signal Pulse Response, CL = 100 pF
Figure 23d. Unity Gain Inverter Small
Signal Pulse Response, CL = 1000 pF
increases with gain, once initial trimming is accomplished—but
CMR is still dependent upon the ratio matching of Resistors R1
through R4. Resistor values for this circuit, using the optional
gain resistor, RG, can be calculated using:
R1
= R4 = 49.9 kΩ
R2
= R3 =
49.9 k
0.9 G
−1
RG =
99.8 k
0.06 G
where G = Desired Circuit Gain
Table I provides practical 1% resistance values. (Note that
without resistor RG, R2 and R3 = 49.9 kΩ/G–1.)
Table I. Operating Gains of Amplifiers A1 and A2 and
Practical 1% Resistor Values for the Circuit of Figure 24
Circuit Gain
Gain of A1
Gain of A2
R2, R3
R1, R4
1.10
11.00
1.10
499 k
49.9 k
1.33
4.01
1.33
150 k
49.9 k
1.50
3.00
1.50
100 k
49.9 k
2.00
2.00
2.00
49.9 k
49.9 k
10.1
1.11
10.10
5.49 k
49.9 k
101.0
1.01
101.0
499
49.9 k
1001
1.001
1001
49.9
49.9 k
For a much more comprehensive discussion of in-amp applica-
tions, refer to the Instrumentation Amplifier Applications Guide—
available free from Analog Devices, Inc.
10k
+
AD706
+
0.1µF
8
4
VIN
VOUT
+VS
10k
CL
1/2
0.1 F
RL
2.5k
SQUARE
WAVE
INPUT
–VS


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