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ISO120 の電気的特性と機能

ISO120のメーカーはBurr-Brown Corporationです、この部品の機能は「Precision Low Cost ISOLATION AMPLIFIER」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISO120
部品説明 Precision Low Cost ISOLATION AMPLIFIER
メーカ Burr-Brown Corporation
ロゴ Burr-Brown Corporation ロゴ 




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ISO120 Datasheet, ISO120 PDF,ピン配置, 機能
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





ISO120 pdf, ピン配列
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (any supply) ............................................................... 18V
VIN, Sense Voltage .......................................................................... ±100V
External Oscillator Input .................................................................... ±25V
Signal Common 1 to Ground 1 ........................................................... ±1V
Signal Common 2 to Ground 2 ........................................................... ±1V
Continuous Isolation Voltage: ISO120 ...................................... 1500Vrms
ISO121 ....................................... 3500Vrms
VISO, dv/dt ...................................................................................... 20kV/µs
Junction Temperature ...................................................................... 150°C
Storage Temperature ..................................................... –65°C to +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
Output Short Duration ......................................... Continuous to Common
CONNECTION DIAGRAM
C1H 1/1(1)
C1L 2/2
+VS1 3/3
–VS1 4/4
24/40 Gnd 1
23/39 VIN
22/38 Ext Osc
21/37 Com 1
PACKAGE INFORMATION(1)
MODEL
PACKAGE
PACKAGE DRAWING
NUMBER
ISO120G
ISO120BG
ISO120SG
24-Pin DIP
24-Pin DIP
24-Pin DIP
225
225
225
ISO121G
ISO121BG
40-Pin DIP
40-Pin DIP
206
206
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
ORDERING INFORMATION
MODEL
ISO120G
ISO120BG
ISO120SG
ISO121G
ISO121BG
TEMPERATURE
RANGE
–25°C to 85°C
–25°C to 85°C
–55C to 125°C
–25°C to 85°C
–25°C to 85°C
Com 2 9/17
VOUT 10/18
Sense 11/19
Gnd 2 12/20
16/24 –VS2
15/23 +VS2
14/22 C2L
13/21 C2H
NOTE: (1) First pin number is for ISO120.
Second pin number is for ISO121.
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from per-
formance degradation to complete device failure. Burr-Brown
Corporation recommends that all integrated circuits be handled
and stored using appropriate ESD protection methods.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
3 ISO120/121


3Pages


ISO120 電子部品, 半導体
TYPICAL PERFORMANCE CURVES (CONT)
TA = +25°C; VS1 = VS2 = ±15V; and RL = 2k, unless otherwise noted.
STEP RESPONSE
+10
0
–10
+10
0
–10
STEP RESPONSE
+10 +10
00
–10 –10
0 250 500 0
50 100
Time (µs)
Time (µs)
THEORY OF OPERATION
The ISO120 and ISO121 isolation amplifiers comprise input
and output sections galvanically isolated by matched 1pF
capacitors built into the ceramic barrier. The input is duty-
cycle modulated and transmitted digitally across the barrier.
The output section receives the modulated signal, converts it
back to an analog voltage and removes the ripple component
inherent in the demodulation. The input and output sections
are laser-trimmed for exceptional matching of circuitry com-
mon to both input and output sections.
FREE-RUNNING MODE
An input amplifier (A1, Figure1) integrates the difference
between the input current (VIN/200k) and a switched
±100µA current source. This current source is implemented
by a switchable 200µA source and a fixed 100µA current
sink. To understand the basic operation of the input section,
assume that V = 0. The integrator will ramp in one
IN
direction until the comparator threshold is exceeded. The
comparator and sense amp will force the current source to
switch; the resultant signal is a triangular waveform with a
50% duty cycle. If V changes, the duty cycle of the
IN
integrator will change to keep the average DC value at the
output of A1 near zero volts. This action converts the input
voltage to a duty-cycle modulated triangular waveform at
the output of A1 near zero volts. This action converts the
input voltage to a duty-cycle modulated triangular wave-
form at the output of A1 with a frequency determined by the
internal 150pF capacitor. The comparator generates a fast
rise time square wave that is simultaneously fed back to keep
A1 in charge balance and also across the barrier to a
differential sense amplifier with high common-mode rejec-
tion characteristics. The sense amplifier drives a switched
current source surrounding A2. The output stage balances
the duty-cycle modulated current against the feedback cur-
rent through the 200kfeedback resistor, resulting in an
average value at the Sense pin equal to VIN. The sample and
hold amplifiers in the output feedback loop serve to remove
undesired ripple voltages inherent in the demodulation process.
SYNCHRONIZED MODE
A unique feature of the ISO120 and ISO121 is the ability to
synchronize the modulator to an external signal source. This
capability is useful in eliminating trouble-some beat fre-
quencies in multi-channel systems and in rejecting AC
signals and their harmonics. To use this feature, external
capacitors are connected at C1 and C2 (Figure 1) to change
the free-running carrier frequency. An external signal is
applied to the Ext Osc pin. This signal forces the current
source to switch at the frequency of the external signal. If
V is zero, and the external source has a 50% duty cycle,
IN
operation proceeds as described above, except that the switch-
ing frequency is that of the external source. If the external
signal has a duty cycle other than 50%, its average value is
not zero. At start-up, the current source does not switch until
the integrator establishes an output equal to the average DC
value of the external signal. At this point, the external signal
is able to trigger the current source, producing a triangular
waveform, symmetrical about the new DC value, at the
output of A1. For VIN = 0, this waveform has a 50% duty
cycle. As VIN varies, the waveform retains its DC offset, but
varies in duty cycle to maintain charge balance around A1.
Operation of the demodulator is the same as outlined above.
Synchronizing to a Sine
or Triangle Wave External Clock
The ideal external clock signal for the ISO120/121 is a ±4V
sine wave or ±4V, 50% duty-cycle triangle wave. The ext osc
pin of the ISO120/121 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 synchro-
nize to the signal.
Synchronizing to signals below 400kHz requires the addition
of two external capacitors to the ISO120/121. Connect one
capacitor in parallel with the internal modulator capacitor and
connect the other capacitor in parallel with the internal de-
modulator capacitor as shown in Figure 1.
ISO120/121
6

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
ISO120

Precision Low Cost ISOLATION AMPLIFIER

Burr-Brown Corporation
Burr-Brown Corporation
ISO120

Precision Low Cost Isolation Amplifier

Texas Instruments
Texas Instruments
ISO120BG

Precision Low Cost ISOLATION AMPLIFIER

Burr-Brown Corporation
Burr-Brown Corporation
ISO120G

Precision Low Cost ISOLATION AMPLIFIER

Burr-Brown Corporation
Burr-Brown Corporation


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