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參數(shù)資料
| 型號(hào)： | ISO176P |
| 英文描述： | Precision, Isolated OPERATIONAL AMPLIFIER |
| 中文描述： | 精密，隔離運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 118K |
| 代理商： | ISO176P |
6
ISO176
MOD
Shield 1
Ext Osc
+V
S1
+V
S2
GND 1
20
–V
S1
3
–V
S2
13
–V
S2
+V
S2
–V
S1
+V
S1
V
IN+
R
LOAD
GND 2
12
23
5
22
0.1μF
1μF
4
15
Shield 2
OUT
Com2
14
11
10
V
OUT
V
IN–
V
IN+
21
2
24
1
Com 1
1μF
0.1μF
1μF
0.1μF
0.1μF
1μF
–
+
–
+
–
+
–
+
INPUT BIAS CURRENT CANCELLATION
The input stage base current of the uncommitted op amp is
internally compensated with an equal and opposite cancella-
tion current. The resulting input bias current is the difference
between the input stage base current and the cancellation
current. This residual input bias current can be positive or
negative.
When the bias current is cancelled in this manner, the input
bias current and input offset current are approximately the
same magnitude. As a result, it is not necessary to balance
the DC resistance seen at the two input terminals.
A resistor
added to balance the input resistances may actually
increase offset and noise.
SYNCHRONIZED OPERATION
ISO176 can be synchronized to an external signal source.
This capability is useful in eliminating troublesome beat
frequencies in multichannel systems and in rejecting AC
signals and their harmonics. To use this feature, an external
signal must be applied to the Ext Osc pin. ISO176 can be
synchronized over the 400kHz to 700kHz range.
The ideal external clock signal for ISO176 is a
±
4V sine
wave or
±
4V, 50% duty-cycle triangle wave. The Ext Osc
pin of the ISO176 can be driven directly with a
±
3V to
±
5V
sine or 25% to 75% duty-cycle triangle wave and the ISO
amp’s internal modulator/demodulator circuitry will syn-
chronize to the signal.
BASIC OPERATION
ISO176 isolation amplifier comprises a precision uncommit-
ted operational amplifier followed by an isolation amplifier.
The input and output isolation sections are galvanically
isolated by matched and EMI shielded capacitors.
Signal and Power Connections
Figure 1 shows power and signal connections. Each power
supply pin should be bypassed with a 1
μ
F tantalum capaci-
tor located as close to the amplifier as possible. All ground
connections should be run independently to a common
point. Signal Common on both input and output sections
provide a high-impedance point for sensing signal ground in
noisy applications. Com 1 and Com 2 must have a path to
ground for bias current return and should be maintained
within
±
1V of GND1 and GND2, respectively.
INPUT PROTECTION
The amplifier inputs of ISO176 are protected with 500
series input resistors and diode clamps. The inputs can
withstand
±
30V differential inputs without damage. The
protection diodes will, of course, conduct current when the
inputs are over-driven. This may disturb the slewing behav-
ior of unity-gain follower applications, but it will not dam-
age the op amp. The MOD input is a 200k
resistor and can
withstand
±
100V without damage.
FIGURE 1. Basic Connections.
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