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ISO122P の電気的特性と機能

ISO122PのメーカーはBurr-Brown Corporationです、この部品の機能は「Precision Lowest Cost ISOLATION AMPLIFIER」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISO122P
部品説明 Precision Lowest Cost ISOLATION AMPLIFIER
メーカ Burr-Brown Corporation
ロゴ Burr-Brown Corporation ロゴ 




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ISO122P Datasheet, ISO122P PDF,ピン配置, 機能
ISO122
SBOS160
Precision Lowest Cost
ISOLATION AMPLIFIER
FEATURES
q 100% TESTED FOR HIGH-VOLTAGE
BREAKDOWN
q RATED 1500Vrms
q HIGH IMR: 140dB at 60Hz
q
BIPOLAR
OPERATION:
V=
O
±10V
q 16-PIN PLASTIC DIP AND 28-LEAD SOIC
q EASE OF USE: Fixed Unity Gain
Configuration
q 0.020% max NONLINEARITY
q ±4.5V to ±18V SUPPLY RANGE
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL:
Transducer Isolator, Isolator for Thermo-
couples, RTDs, Pressure Bridges, and
Flow Meters, 4mA to 20mA Loop Isolation
q GROUND LOOP ELIMINATION
q MOTOR AND SCR CONTROL
q POWER MONITORING
q PC-BASED DATA ACQUISITION
q TEST EQUIPMENT
DESCRIPTION
The ISO122 is a precision isolation amplifier incor-
porating a novel duty cycle modulation-demodulation
technique. The signal is transmitted digitally across
a 2pF differential capacitive barrier. With digital modu-
lation the barrier characteristics do not affect signal
integrity, resulting in excellent reliability and good high
frequency transient immunity across the barrier. Both
barrier capacitors are imbedded in the plastic body of
the package.
The ISO122 is easy to use. No external components
are required for operation. The key specifications are
0.020% max nonlinearity, 50kHz signal bandwidth,
and 200µV/°C VOS drift. A power supply range of
±4.5V to ±18V and quiescent currents of ±5.0mA on
VS1 and ±5.5mA on VS2 make these amplifiers ideal
for a wide range of applications.
The ISO122 is available in 16-pin plastic DIP and 28-
lead plastic surface mount packages.
V
IN
V
OUT
–VS1
Gnd
+V
S1
–VS2
Gnd
+V
S2
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
©1989 Burr-Brown Corporation
PDS-857F
Printed in U.S.A. November, 1993

1 Page





ISO122P pdf, ピン配列
CONNECTION DIAGRAM
Top View —P Package
+VS1 1
–VS1 2
16 Gnd
15 VIN
Top View—U Package
+VS1 1
–VS1 2
28 Gnd
27 VIN
VOUT 7
Gnd 8
10 –VS2
9 +VS2
VOUT 13
Gnd 14
16 –VS2
15 +VS2
PACKAGE INFORMATION(1)
MODEL
PACKAGE
PACKAGE DRAWING
NUMBER
ISO122P
ISO122JP
ISO122U
ISO122JU
16-Pin Plastic DIP
16-Pin Plastic DIP
28-Pin Plastic SOIC
28-Pin Plastic SOIC
238
238
217-1
217-1
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
ISO122P
ISO122JP
ISO122U
ISO122JU
PACKAGE
Plastic DIP
Plastic DIP
Plastic SOIC
Plastic SOIC
NONLINEARITY
MAX %FSR
±0.020
±0.050
±0.020
±0.050
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ................................................................................... ±18V
V
IN
......................................................................................................±100V
Continuous Isolation Voltage ..................................................... 1500Vrms
Junction Temperature .................................................................... +150°C
Storage Temperature ....................................................................... +85°C
Lead Temperature (soldering, 10s) ................................................ +300°C
Output Short to Common ......................................................... Continuous
®
3 ISO122


3Pages


ISO122P 電子部品, 半導体
THEORY OF OPERATION
The ISO122 isolation amplifier uses an input and an output
section galvanically isolated by matched 1pF isolating ca-
pacitors built into the plastic package. 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. Input and output sections are
fabricated, then laser trimmed for exceptional circuitry match-
ing common to both input and output sections. The sections
are then mounted on opposite ends of the package with the
isolating capacitors mounted between the two sections. The
transistor count of the ISO122 is 250 transistors.
MODULATOR
An input amplifier (A1, Figure 1) 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 modulator,
assume that V = 0.0V. 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. The internal oscillator forces the current
source to switch at 500kHz. The resultant capacitor drive is
a complementary duty-cycle modulation square wave.
DEMODULATOR
The sense amplifier detects the signal transitions across the
capacitive barrier and drives a switched current source into
integrator A2. The output stage balances the duty-cycle
modulated current against the feedback current through the
200kfeedback resistor, resulting in an average value at the
V pin equal to V . The sample and hold amplifiers in the
OUT
IN
output feedback loop serve to remove undesired ripple
voltages inherent in the demodulation process.
BASIC OPERATION
SIGNAL AND SUPPLY CONNECTIONS
Each power supply pin should be bypassed with 1µF tanta-
lum capacitors located as close to the amplifier as possible.
The internal frequency of the modulator/demodulator is set
at 500kHz by an internal oscillator. Therefore, if it is desired
to minimize any feedthrough noise (beat frequencies) from
a DC/DC converter, use a π filter on the supplies (see Figure
4). ISO122 output has a 500kHz ripple of 20mV, which can
be removed with a simple two pole low-pass filter with a
100kHz cutoff using a low cost op amp. See Figure 4.
The input to the modulator is a current (set by the 200k
integrator input resistor) that makes it possible to have an
input voltage greater than the input supplies, as long as the
output supply is at least ±15V. It is therefore possible when
using an unregulated DC/DC converter to minimize PSR
related output errors with ±5V voltage regulators on the
isolated side and still get the full ±10V input and output
swing. An example of this application is shown in Figure
10.
CARRIER FREQUENCY CONSIDERATIONS
The ISO122 amplifier transmits the signal across the isola-
tion barrier by a 500kHz duty cycle modulation technique.
For input signals having frequencies below 250kHz, this
system works like any linear amplifier. But for frequencies
above 250kHz, the behavior is similar to that of a sampling
amplifier. The signal response to inputs greater than 250kHz
200µA
Isolation Barrier
1pF 1pF
200µA
200k
VIN
150pF
+
A1
Sense
100µA
1pF 1pF
||
Osc
Sense
100µA
150pF
200k
A2 +
S/H
G=1
S/H
G=6
VOUT
+V
S1
Gnd 1
–V
S1
+VS2 Gnd 2 –VS2
FIGURE 1. Block Diagram.
®
ISO122
6

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
ISO122

Precision Lowest Cost ISOLATION AMPLIFIER

Burr-Brown Corporation
Burr-Brown Corporation
ISO122

ISO122 Precision Lowest-Cost Isolation Amplifier (Rev. A)

Texas Instruments
Texas Instruments
ISO122JP

Precision Lowest Cost ISOLATION AMPLIFIER

Burr-Brown Corporation
Burr-Brown Corporation
ISO122JU

Precision Lowest Cost ISOLATION AMPLIFIER

Burr-Brown Corporation
Burr-Brown Corporation


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