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AD705AQ Scheda tecnica(PDF) 7 Page - Analog Devices

Il numero della parte AD705AQ
Spiegazioni elettronici  Picoampere Input Current Bipolar Op Amp
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD705AQ Scheda tecnica(HTML) 7 Page - Analog Devices

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AD705
REV. B
–7–
A High Performance Differential Amplifier Circuit
Figure 25 shows a high input impedance, differential amplifier
circuit that features a high common-mode voltage, and which
operates at low power. Table I details its performance with
changes in gain. To optimize the common-mode rejection of
this circuit at low frequencies and dc, apply a 1 volt, 1 Hz sine
wave to both inputs. Measuring the output with an oscilloscope,
adjust trimming potentiometer R6 for minimum output. For the
best CMR at higher frequencies, capacitor C2 should be replaced
with a 1.5 pF to 20 pF trimmer capacitor.
Both the IC socket and any standoffs at the op amp’s input ter-
minals should be made of Teflon* to maintain low input current
drift over temperature.
*Teflon is a registered trademark of E.I. DuPont, Co.
6
4
0.1µF
–VS
7
0.1µF
+VS
2
3
AD705
VOUT
R2
10M
C1
5pF
R3
200k
R5
*
R4
*
DC CMR
ADJUST
R6
500k
C2
5pF
R2'
10M
R1'
100M
R1
100M
SOURCE
GND
VIN–
VIN+
CIRCUIT GAIN, G = –
(1+
)
R2+R3
R1
R5
R4
VOUT = G (VIN– – VIN+)
COMMON MODE INPUT RANGE =
10 (VS – 1.5V) FOR VS = ±15V,
VCM RANGE = ±135V
RESISTORS R1 AND R1', R2 AND
R2' ARE VICTOREEN MOX-200
1/4 WATT, 1% METAL OXIDE.
*SEE TABLE I
WARNING: POTENTIAL DANGER FROM HIGH SOURCE VOLTAGE.
THIS DIFFERENTIAL AMPLIFIER DOES NOT PROVIDE GALVANIC
ISOLATION. INPUT SOURCE MUST BE REFERRED TO THE SAME
GROUND CONNECTION AS THIS AMPLIFIER.
Figure 25. A High Performance Differentials
Amplifier Circuit
Table I. Typical Performance of Differential Amplifier
Circuit Operating at Various Gains
Circuit
R4
R5
Trimmed
RTI Average Circuit
Gain
( )( )
DC CMR
Drift TC
Bandwidth
(dB)
( V/ C)
–3 dB
1
1.13 k
Ω 10 kΩ≥85
30
4.4 kHz
10
100
9.76 k
Ω≥85
30
2.8 kHz
100
10.2
10 k
Ω≥85
30
930 Hz
100
90
10
0%
5µs
20mV
Figure 22d. Unity Gain Inverter Small Signal
Pulse Response C, = 1000 pF
6
4
0.1µF
–VS
7
0.1µF
+VS
2
3
AD705
VOUT
VIN
SQUARE WAVE
INPUT
10k
5k
10pF
*
5
*RESPONSE IS
NEARLY IDENTICAL
FOR CAPACITANCE
VALUES OF 0 TO 100pF
4.1nF
Figure 23a. Follower Connected
in Feed-Forward Mode
100
90
10
0%
5V
5µs
5V
INPUT
OUTPUT
Figure 23b. Follower Feed-Forward
Pulse Response
6
5
8
4
1
2
3
7
AD705
OVERCOMPENSATION
CAPACITOR
0.1µF
+VS
20k
VOS ADJUST
–VS
0.1µF
Figure 24. Offset Null and Overcompensation
Connections


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