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PDF ISO100 Data sheet ( Hoja de datos )
| Número de pieza | ISO100 | |
| Descripción | Optically-Coupled Linear ISOLATION AMPLIFIER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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ISO100
ISO100
Optically-Coupled Linear
ISOLATION AMPLIFIER
FEATURES
q EASY TO USE, SIMILAR TO AN OP AMP
VOUT/IIN = RF, Current Input
VOUT/VIN = RF/RIN, Voltage Input
q 100% TESTED FOR BREAKDOWN:
750V Continuous Isolation Voltage
q ULTRA-LOW LEAKAGE: 0.3µA, max, at
240V/60Hz
q WIDE BANDWIDTH: 60kHz
q 18-PIN DIP PACKAGE
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
Transducer Sensing
(Thermocouples, RTD, Pressure Bridges)
4mA to 20mA Loops
Motor and SCR Control
Ground Loop Elimination
q BIOMEDICAL MEASUREMENTS
q TEST EQUIPMENT
q DATA ACQUISITION
DESCRIPTION
The ISO100 is an optically-coupled isolation ampli-
fier. High accuracy, linearity, and time-temperature
stability are achieved by coupling light from an LED
back to the input (negative feedback) as well as for-
ward to the output. Optical components are carefully
matched and the amplifier is actively laser-trimmed to
assure excellent tracking and low offset errors.
The circuit acts as a current-to-voltage converter with
a minimum of 750V (2500V test) between input and
output terminals. It also effectively breaks the gal-
vanic connection between input and output commons
as indicated by the ultra-low 60Hz leakage current of
0.3µA at 250V. Voltage input operation is easily
achieved by using one external resistor.
Versatility along with outstanding DC and AC perfor-
mance provide excellent solutions to a variety of
challenging isolation problems. For example, the
ISO100 is capable of operating in many modes, in-
cluding: noninverting (unipolar and bipolar) and in-
verting (unipolar and bipolar) configurations. Two
precision current sources are provided to accomplish
bipolar operation. Since these are not required for
unipolar operation, they are available for external use
(see Applications section).
Designs using the ISO100 are easily accomplished
with relatively few external components. Since VOUT
of the ISO100 is simply IINRF, gains can be changed
by altering one resistor value. In addition, the ISO100
has sufficient bandwidth (DC to 60kHz) to amplify
most industrial and test equipment signals.
IREF1 Balance
16 13 14
RF IREF2 Balance
7 856
+In 15
–In 17
A1
A2 3 VOUT
D1
LED
D2
12 10 18
9 42
–VCC +VCC
Input
Output –VCC +VCC
Common
Common
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1982 Burr-Brown Corporation
PDS1-456G
ISO100Printed in U.S.A. August, 1997
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, ±VCC = 15VDC, unless otherwise specified.
20
10
0
–10
–20
–30
–40
1
SMALL SIGNAL FREQUENCY RESPONSE
No CF
CF = 4pF
10 100
Frequency (kHz)
1000
±20
±15
±10
±5
0
10k
BIPOLAR OUTPUT SWING vs RF
±18VCC
Output Stage
Power Supply
±13VCC
±10VCC
±7VCC
100k
VO = (12µA) (RF)
= |VCC| – 1.2V max
1M
RF (Ω)
10M
100M
BIPOLAR INPUT STAGE SUPPLY CURRENT
vs INPUT CURRENT
10
5
0
–5
–10
–20
+VCC
–VCC
–10 0 10
IIN (µA)
20
0
90
180
270
1
PHASE SHIFT vs FREQUENCY
No CF
CF = 4pF
10 100
Frequency (kHz)
1000
0
–5
–10
–15
–20
10k
UNIPOLAR OUTPUT SWING vs RF
VO = (12µA) (RF)
= |VCC| – 1.2 V max
±7VCC
±10VCC
±13VCC
Output Stage
Power Supply
±18VCC
100k
1M
RF (Ω)
10M
100M
UNIPOLAR INPUT STAGE SUPPLY CURRENT
vs INPUT CURRENT
10
Not specified for
operation in this region.
5
0
–VCC
–5
Short circuit
current limit.
+VCC
–30
–20 –10
0
10
IIN (µA)
20
5 ISO100
5 Page 
R10 R11 Optional Bipolar IOS Adjust.
1MΩ 10MΩ
RF
1MΩ
RIN
VIN
9.76kΩ RG
500Ω
Pot
15
+In
ISO100
IC
R12 R13
316kΩ 10MΩ
λ 7–
9+
8
3
VOUT
–In
17 14
13 +V
18
R14
100kΩ
FIGURE 7. Adjusting the Bipolar Errors.
BASIC CIRCUIT CONNECTIONS
R1 15
+
16
RSOURCE
+
VIN(1)
ISO100
–
17
18
RF
78
3
9
VOUT = –VIN (RF /R1)
NOTE: (1) Use postitive input voltage only, VIN >> 10µA x RSOURCE.
FIGURE 10. Unipolar Inverting.
R1
RSOURCE
+
VIN(1)
16
15
+
ISO100
–
17
18
RF
78
3
9
VOUT = –VIN (RF /R1)
FIGURE 8. Unipolar Noninverting.
RIN
Shield
15
16
+
+
VIN IIN
ISO100
–
17
18
RF
78
3
9
VOUT = IINRF
or
VOUT = VIN (RF /RIN)
FIGURE 9. Bipolar Noninverting.
NOTE: (1) VIN >> 10µA x RSOURCE.
FIGURE 11. Bipolar Inverting.
APPLICATION INFORMATION
The small size, low offset and drift, wide bandwidth, ultra-
low leakage, and low cost, make the ISO100 ideal for a
variety of isolation applications. The basic mode of
operation of the ISO100 will be determined by the type of
signal and application.
Major points to consider when designing circuits with the
ISO100.
1. Input Common (pin 18) and –In (pin 17) should be
grounded through separate lines. The Input Common can
carry a large DC current and may cause feedback to the
signal input.
2. Use shielded or twisted pair cable at the input for long
lines.
3. Care should be taken to minimize external capacitance
across the isolation barrier.
11 ISO100
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISO100.PDF ] | |
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