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參數(shù)資料
| 型號(hào)： | AD705JCHIPS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Picoampere Input Current Bipolar Op Amp |
| 中文描述： | OP-AMP, 150 uV OFFSET-MAX, 0.8 MHz BAND WIDTH, UUC6 |
| 封裝： | DIE-6 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 451K |
| 代理商： | AD705JCHIPS |
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
–V
S
7
0.1μF
+V
S
2
3
AD705
V
OUT
R2
10M
C1
5pF
R3
200k
R5
*
R4
*
DC CMR
ADJUST
R6
500k
C2
5pF
R2'
10M
R1'
100M
R1
100M
SOURCE
GND
V
IN–
V
IN+
CIRCUIT GAIN, G = –RR1
R5
R4
V
OUT
= G (V
IN–
– V
IN+)
COMMON MODE INPUT RANGE =
10 (V
– 1.5V) FOR V
S
=
±
15V,
V
CM
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
Gain
R4
(
V
)
R5
(
V
)
Trimmed
DC CMR
(dB)
RTI Average Circuit
Drift TC
(
m
V/
8
C)
Bandwidth
–3 dB
1
10
100
1.13 k
100
10.2
10 k
9.76 k
10 k
≥
85
≥
85
≥
85
30
30
30
4.4 kHz
2.8 kHz
930 Hz
100
90
10
0%
5μs
20mV
Figure 22d. Unity Gain Inverter Small Signal
Pulse Response C, = 1000 pF
6
4
0.1μF
–V
S
7
0.1μF
+V
S
2
3
AD705
V
OUT
V
IN
SQUARE WAVE
INPUT
10k
5k
10pF
*
5
RESPONSE IS
NEARLY IDENTICAL
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
+V
S
20k
V
OS
ADJUST
–V
S
0.1μF
Figure 24. Offset Null and Overcompensation
Connections
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