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PDF ISO120BG Data sheet ( Hoja de datos )
| Número de pieza | ISO120BG | |
| Descripción | Precision Low Cost ISOLATION AMPLIFIER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISO120BG (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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ISO120
ISO121
Precision Low Cost
ISOLATION AMPLIFIER
FEATURES
q 100% TESTED FOR PARTIAL DISCHARGE
q ISO120: Rated 1500Vrms
q ISO121: Rated 3500Vrms
q HIGH IMR: 115dB at 60Hz
q USER CONTROL OF CARRIER
FREQUENCY
q LOW NONLINEARITY: ±0.01% max
q BIPOLAR OPERATION: VO = ±10V
q 0.3"-WIDE 24-PIN HERMETIC DIP, ISO120
q SYNCHRONIZATION CAPABILITY
q WIDE TEMP RANGE: –55°C to +125°C
(ISO120)
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL: Trans-
ducer Isolator for Thermocouples, RTDs,
Pressure Bridges, and Flow Meters, 4mA
to 20mA Loop Isolation
q GROUND LOOP ELIMINATION
q MOTOR AND SCR CONTROL
q POWER MONITORING
q ANALYTICAL MEASUREMENTS
q BIOMEDICAL MEASUREMENTS
q DATA ACQUISITION
q TEST EQUIPMENT
DESCRIPTION
The ISO120 and ISO121 are precision isolation ampli-
fiers incorporating a novel duty cycle modulation-
demodulation technique. The signal is transmitted
digitally across a 2pF differential capacitive barrier.
With digital modulation the barrier characteristics do
not affect signal integrity, which results in excellent
reliability and good high frequency transient immu-
nity across the barrier. Both the amplifier and barrier
capacitors are housed in a hermetic DIP. The ISO120
and ISO121 differ only in package size and isolation
voltage rating.
These amplifiers are easy to use. No external compo-
nents are required for 60kHz bandwidth. With the
addition of two external capacitors, precision specifi-
cations of 0.01% max nonlinearity and 150µV/°C max
VOS drift are guaranteed with 6kHz bandwidth. A
power supply range of ±4.5V to ±18V and low quies-
cent current make these amplifiers ideal for a wide
range of applications.
C1H
C1L
VIN
Signal
Com 1
Ext Osc
+VS1
Gnd 1
–VS1
Isolation Barrier
C2H
C2L
Sense
VOUT
Signal
Com 2
–VS2
Gnd 2
+VS2
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1988 Burr-Brown Corporation
PDS-820D
Printed in U.S.A. March, 1992
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
TA = +25°C; VS1 = VS2 = ±15V; and RL = 2kΩ, unless otherwise noted.
160
140
120
100
80
60
40
1
IMR vs FREQUENCY
10 100 1k 10k 100k 1M
Frequency (Hz)
SIGNAL RESPONSE vs CARRIER FREQUENCY
0
–20dB/dec (for comparison only)
–20
–40
fIN (Hz) 0
fC 2fC 3fC
fOUT (Hz) 0
fc/2
0 fC/2
0
fC /2
0
10nF
1000pF
SYNCHRONIZATION RANGE at 25°C
±4Vp SINE WAVE INPUT TO EXT OSC
Typical
Free Run
Frequency
0
1k
10k 100k
C2 ≥ C1
Frequency (Hz)
1M
NOISE vs SMALL SIGNAL BANDWIDTH
12
10
8
C2 = C1*
6
4
C2 = 2C1
2
*C1 ≤ 5000pF
0
0.1f–3dB
0.2f–3dB
0.5f–3dB
Normalized Frequency
f–3dB
SINE RESPONSE
(f = 2kHz, C2 = 0)
SINE RESPONSE
(f = 20kHz, C2 = 0)
+10 +10
00
–10 –10
0 500 1000
Time (µs)
FPO
BLEED
TO EDGE
OF BOX
0
5
50
Time (µs)
100
ISO120/121
5 Page 
APPLICATIONS
The ISO120 and ISO121 isolation amplifiers are used in
three categories of applications:
1. Accurate isolation of signals from high voltage ground
potentials,
2. Accurate isolation of signals from severe ground noise
and,
3. Fault protection from high voltages in analog measure-
ments.
Figures 7 through 12 show a variety of Application Circuits.
APPLICATION CIRCUITS
+15V
+
10µF
'E
0.3µF
20µH
4
TO
8 +VIN
PWS740-1
PWS740-2
61
3
1
0.3µF
5
0.3µF
2
PWS740-3
0.3µF
TO 6
35
4 36
4
1.0µF
–VS1
0-5V
System Uses:
1 - Oscillator/Driver
8 - Transformers
8 - Bridges
8 - ISO120s
8 - Transistors VN2222
8 - Zener Diodes, 6.2V, 400mW, 20%
Not all components shown.
To other
channels
20kΩ
20pF
+15V
IL = 0-20mA
1.0µF
23
4
3
22
ISO120
24
21
1.0µF
–15V
16
15
12
9
1.0µF
10
11
+15V
20kΩ
RL ≤ 600Ω
VN2222
1/4W
250Ω
0.1%
6.2V
400mW
–15V
FIGURE 7. Eight-channel Isolated 0-20mA Loop Driver.
11 ISO120/121
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ISO120BG.PDF ] | |
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