ISO124 Precision Lowest Cost ISOLATION AMPLIFIER FEATURES

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ISO124 Precision Lowest Cost ISOLATION AMPLIFIER FEATURES

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ISO124
Precision Lowest Cost ISOLATION AMPLIFIER
FEATURES
100% TESTED HIGH-VOLTAGE BREAKDOWN RATED 1500Vrms HIGH IMR: 140dB 60Hz 0.010% NONLINEARITY BIPOLAR OPERATION: ±10V 16-PIN PLASTIC 28-LEAD SOIC EASE USE: Fixed Unity Gain Configuration ±4.5V ±18V SUPPLY RANGE
APPLICATIONS
INDUSTRIAL PROCESS CONTROL: Transducer Isolator, Isolator Thermocouples, RTDs, Pressure Bridges, Flow Meters, 20mA Loop Isolation GROUND LOOP ELIMINATION MOTOR CONTROL POWER MONITORING PC-BASED DATA ACQUISITION TEST EQUIPMENT
DESCRIPTION
ISO124 precision isolation amplifier incorporating novel duty cycle modulation-demodulation technique. signal transmitted digitally across differential capacitive barrier. With digital modulation barrier characteristics affect signal integrity, resulting excellent reliability good high frequency transient immunity across barrier. Both barrier capacitors imbedded plastic body package. ISO124 easy use. external components required operation. specifications 0.010% nonlinearity, 50kHz signal bandwidth, 200µV/°C drift. power supply range ±4.5V ±18V quiescent currents ±5.0mA ±5.5mA make these amplifiers ideal wide range applications. ISO124 available 16-pin plastic 28lead plastic surface mount packages.
VOUT
-VS2 +VS2 -VS1 +VS1
International Airport Industrial Park Mailing Address: 11400, Tucson, 85734 Street Address: 6730 Tucson Blvd., Tucson, 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
1997 Burr-Brown Corporation
PDS-1405A
Printed U.S.A. September, 1997
ISO124
SPECIFICATIONS
+25°C ±15V, unless otherwise noted. ISO124P, PARAMETER ISOLATION Rated Voltage, continuous 60Hz 100% Test Isolation Mode Rejection Barrier Impedance Leakage Current 60Hz GAIN Nominal Gain Gain Error Gain Temperature Nonlinearity(2) INPUT OFFSET VOLTAGE Initial Offset Temperature Supply Noise INPUT Voltage Range Resistance OUTPUT Voltage Range Current Drive Capacitive Load Drive Ripple Voltage(3) FREQUENCY RESPONSE Small Signal Bandwidth Slew Rate Settling Time 0.1% 0.01% Overload Recovery Time POWER SUPPLIES Rated Voltage Voltage Range Quiescent Current: TEMPERATURE RANGE Specification Operating Storage Thermal Resistance, CONDITIONS 1500 2400 1014 0.18 ±0.05 ±0.005 ±200 ±12.5 ±12.5 ±10V ±5.0 ±5.5 UNITS µArms %FSR ppm/°C %FSR µV/°C mV/V µV/Hz mVp-p V/µs °C/W °C/W
60Hz VISO 240Vrms ±10V
±0.50 ±0.010
±4.5
±7.0 ±7.0
NOTES: Tested rated, fail partial discharge. Nonlinearity peak deviation output voltage from best-fit straight line. expressed ratio deviation FSR. Ripple frequency carrier frequency (500kHz).
information provided herein believed reliable; however, BURR-BROWN assumes responsibility inaccuracies omissions. BURR-BROWN assumes responsibility this information, such information shall entirely user's risk. Prices specifications subject change without notice. patent rights licenses circuits described herein implied granted third party. BURR-BROWN does authorize warrant BURR-BROWN product life support devices and/or systems.
ISO124
CONNECTION DIAGRAM
View Package View-U Package
+VS1 -VS1
+VS1 -VS1
VOUT
-VS2 +VS2
VOUT
-VS2 +VS2
PACKAGE INFORMATION
PRODUCT ISO124P ISO124U PACKAGE 16-Pin Plastic 28-Lead Plastic SOIC PACKAGE DRAWING NUMBER(1) 217-1
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage ±18V .±100V Continuous Isolation Voltage 1500Vrms Junction Temperature +150°C Storage Temperature +85°C Lead Temperature (soldering, 10s) +300°C Output Short Common Continuous NOTE: Stresses above these ratings cause permanent damage.
NOTE: detailed drawing dimension table, please data sheet, Appendix Burr-Brown Data Book.
ORDERING INFORMATION
PRODUCT ISO124P ISO124U PACKAGE 16-Pin Plastic 28-Lead Plastic SOIC NONLINEARITY %FSR ±0.010 ±0.010
ELECTROSTATIC DISCHARGE SENSITIVITY
This integrated circuit damaged ESD. Burr-Brown recommends that integrated circuits handled with appropriate precautions. Failure observe proper handling installation procedures cause damage. damage range from subtle performance degradation complete device failure. Precision integrated circuits more susceptible damage because very small parametric changes could cause device meet published specifications.
ISO124
TYPICAL PERFORMANCE CURVES
+25°C, ±15V, unless otherwise noted.
SINE RESPONSE 2kHz)
SINE RESPONSE 20kHz)
Output Voltage
Output Voltage
Time (µs)
1000
Time (µs)
STEP RESPONSE
STEP RESPONSE
Output Voltage
Output Voltage
Time (µs)
1000
Time (µs)
ISOLATION VOLTAGE FREQUENCY
FREQUENCY
Rating 2.1k
(dB)
100M Degraded Performance
Peak Isolation Voltage
Typical Performance 100k Frequency (Hz)
Frequency (Hz) 100k
ISO124
TYPICAL PERFORMANCE CURVES (CONT)
+25°C, ±15V, unless otherwise noted.
PSRR FREQUENCY 10mA +VS1, +VS2 -VS1, -VS2 Leakage Current (rms) 100mA
ISOLATION LEAKAGE CURRENT FREQUENCY
PSRR (dB)
1500Vrms 100µA 10µA 240Vrms
Frequency (Hz) 100k
0.1µA Frequency (Hz) 100k
SIGNAL RESPONSE INPUTS GREATER THAN 250kHz VOUT/VIN
VOUT/VIN (dBm)
100kHz Frequency
Frequency
500k
1.5M
Input Frequency (Hz) (NOTE: Shaded area shows aliasing frequencies that cannot removed low-pass filter output.)
ISO124
THEORY OPERATION
ISO124 isolation amplifier uses input output section galvanically isolated matched isolating capacitors built into plastic package. input dutycycle modulated transmitted digitally across barrier. output section receives modulated signal, converts back analog voltage removes ripple component inherent demodulation. Input output sections fabricated, then laser trimmed exceptional circuitry matching common both input output sections. sections then mounted opposite ends package with isolating capacitors mounted between sections. transistor count ISO124 transistors. MODULATOR input amplifier (A1, Figure integrates difference between input current (VIN/200k) switched ±100µA current source. This current source implemented switchable 200µA source fixed 100µA current sink. understand basic operation modulator, assume that 0.0V. integrator will ramp direction until comparator threshold exceeded. comparator sense will force current source switch; resultant signal triangular waveform with duty cycle. internal oscillator forces current source switch 500kHz. resultant capacitor drive complementary duty-cycle modulation square wave. DEMODULATOR sense amplifier detects signal transitions across capacitive barrier drives switched current source into integrator output stage balances duty-cycle
modulated current against feedback current through 200k feedback resistor, resulting average value VOUT equal VIN. sample hold amplifiers output feedback loop serve remove undesired ripple voltages inherent demodulation process.
BASIC OPERATION
SIGNAL SUPPLY CONNECTIONS Each power supply should bypassed with tantalum capacitors located close amplifier possible. internal frequency modulator/demodulator 500kHz internal oscillator. Therefore, desired minimize feedthrough noise (beat frequencies) from DC/DC converter, filter supplies (see Figure ISO124 output 500kHz ripple 20mV, which removed with simple pole low-pass filter with 100kHz cutoff using cost (see Figure input modulator current (set 200k integrator input resistor) that makes possible have input voltage greater than input supplies, long output supply least ±15V. therefore possible when using unregulated DC/DC converter minimize related output errors with voltage regulators isolated side still full ±10V input output swing. example this application shown Figure CARRIER FREQUENCY CONSIDERATIONS ISO124 amplifier transmits signal across isolation barrier 500kHz duty cycle modulation technique. input signals having frequencies below 250kHz, this system works like linear amplifier. frequencies
Isolation Barrier 200µA
200µA
Sense 100µA 200k VOUT 150pF Sense 100µA 150pF 200k
+VS1
-VS1
+VS2
-VS2
FIGURE Block Diagram.
ISO124
above 250kHz, behavior similar that sampling amplifier. signal response inputs greater than 250kHz performance curve shows this behavior graphically; input frequencies above 250kHz device generates output signal component reduced magnitude frequency below 250kHz. This aliasing effect sampling frequencies less than times signal frequency (the Nyquist frequency). Note that carrier frequency harmonics, both frequency amplitude aliasing zero. ISOLATION MODE VOLTAGE INDUCED ERRORS induce errors output indicated plots Frequency. should noted that frequency exceeds 250kHz, output also will display spurious outputs (aliasing) manner similar that >250kHz amplifier response will identical that shown "Signal Response Inputs Greater Than 250kHz" typical performance curve. This occurs because IMV-induced errors behave like inputreferred error signals. predict total error, divide isolation voltage shown "IMR versus Frequency" typical performance curve compute amplifier response this input-referred error signal from data given "Signal Response Inputs Greater Than 250kHz" typical performance curve. example, 800kHz 1000Vrms present, then total [(-60dB) (-30dB)] (1000V) 32mV error signal 200kHz plus 800kHz error signal will present output. HIGH dV/dt ERRORS frequency increases dV/dt exceeds 1000V/µs, sense start false trigger, output will display spurious errors. common-mode current being sent across barrier high slew rate cause false triggering sense amplifier. Lowering power supply voltages below ±15V decrease dV/dt 500V/µs typical performance.
Isolation Barrier
HIGH VOLTAGE TESTING Burr-Brown Corporation adopted partial discharge test criterion that conforms German VDE0884 Optocoupler Standards. This method requires measurement minute current pulses (<5pC) while applying 2400Vrms, 60Hz high voltage stress across every ISO124 isolation barrier. partial discharge initiated pass this test. This criterion confirms transient overvoltage (1.6 1500Vrms) protection without damage ISO124. Lifetest results verify absence failure under continuous rated voltage maximum temperature. This test method represents "state-of-the art" non-destructive high voltage reliability testing. based effects non-uniform fields that exist heterogeneous dielectric material during barrier degradation. case void non-uniformities, electric field stress begins ionize void region before bridging entire high voltage barrier. transient conduction charge during after ionization detected externally burst 0.010.1µs current pulses that repeat each voltage cycle. minimum barrier voltage that initiates partial discharge defined "inception voltage." Decreasing barrier voltage lower level required before partial discharge ceases defined "extinction voltage." have characterized developed package insulation processes yield inception voltage excess 2400Vrms that transient overvoltages below this level will damage ISO124. extinction voltage above 1500Vrms that even overvoltage induced partial discharge will cease once barrier voltage reduced 1500Vrms (rated) level. Older high voltage test methods relied applying large enough overvoltage (above rating) break down marginal parts, high damage good ones. partial discharge testing gives more confidence barrier reliability than breakdown/no breakdown criteria.
ISO150
ISO124 +VS2 -VS1 +VS1 ±VS1
-VS2
VOUT
+15V -15V ISO124
+15V -15V
VOUT
±VS2
PGA102
FIGURE Basic Signal Power Connections.
FIGURE Programmable-Gain Isolation Channel with Gains 100.
ISO124
1000pF Isolation Barrier
4.75k ISO124 -VS2 +VS2 Gnd1 -VS1 +VS1 10µH 10µH ±VS1 10µH 10µH ±VS2 Gnd2
9.76k
OPA237
VOUT
220pF
FIGURE Optional Filter Minimize Power Supply Feedthrough Noise; Output Filter Remove 500kHz Carrier Ripple. more information concerning output filter refer AB-023 AB-034.
This Section Repeated Times. ISO124
Charge/Discharge Control
Multiplexer
Control Section
ISO124
INA105
FIGURE Battery Monitor 600V Battery Power System. (Derives input power from battery.)
ISO124
+15V
10.0V Thermocouple +15V REF102 +15V -15V +15V -15V
Isothermal Block with 1N4148(1)
INA114 INA128 -15V Zero TYPE
VOUT ISO124
MATERIAL Chromel Constantan Iron Constantan Chromel Alumel Copper Constantan
SEEBACK COEFFICIENT (µV/°C) 58.5 50.2 39.4 38.0
100) 3.48k 4.12k 5.23k 5.49k
100) 56.2k 64.9k 80.6k 84.5k
Ground Loop Through Conduit NOTE: -2.1mV/°C 2.00µA.
FIGURE Thermocouple Amplifier with Ground Loop Elimination, Cold Junction Compensation, Up-scale Burn-out.
0.8mA 0.8mA (PT100) RZ(1)
0.01µF
4-20mA PWS740 ISO124 -15V PWS740
XTR105
RCV420
VOUT
1.6mA
NOTE: resistance minimum measured temperature.
FIGURE Isolated 4-20mA Instrument Loop. (RTD shown.)
ISO124
Load
0.01µF ISO124 0.47µF 0.47µF MPY634 0.47µF DCP011515 0.47µF 0.47µF (V2) ISO124 10RS OPA237 (V1)
ISO124
(RD1 RD2) (V3) (RD1 RD2) DCP011515
0.47µF
FIGURE Isolated Power Line Monitor.
+15V
VIN, ±10V Swing ISO124
-15V VOUT
Regulator MC78L05
0.1µF 0.1µF
Regulator MC79L05
0.47µF
0.47µF 0.47µF
DCP011515
NOTE: input supplies subregulated reduce related errors without reducing ±10V input range.
FIGURE Improved Using External Regulator.
(+15V) INPUT RANGE (V)(1) INA105 Difference ISO124 Reference IN4689 5.1V -VS1 -VS2 (-15V) VOUT +VS2 (+15V)
Signal Source
NOTE: Select match
NOTE: Since amplifier unity gain, input range also output range. output since output section operates from dual supplies.
FIGURE Single Supply Operation ISO124 Isolation Amplifier. additional information refer AB-009.
ISO124
DCP011515
0.47µF
0.47µF 0.47µF
Input
-15V, 20mA
+15V, 20mA Auxiliary Isolated Power Output
INPUT SECTION
ISO124
OUTPUT SECTION
+15V -15V
Output
FIGURE Input-Side Powered Amp.
+15V
DCP011515
DCP011515
0.47µF
0.47µF 0.47µF
0.47µF 0.47µF -15V, 20mA +15V, 20mA
Input
Auxiliary Isolated Power Output
INPUT SECTION Auxiliary Isolated Power Output +15V, 20mA -15V, 20mA
ISO124
OUTPUT SECTION
Output
FIGURE Powered with Three-Port Isolation.
ISO124

ISO124 Precision Lowest Cost ISOLATION AMPLIFIER FEATURES

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