Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Isolation amp PDIP 16

FEATURES

● 100% TESTED FOR HIGH-VOLTAGE

BREAKDOWN

● RATED 1500Vrms

● HIGH IMR: 140dB at 60Hz

● 0.010% max NONLINEARITY

● BIPOLAR OPERATION: V

= ±10V

● DIP-16 AND SO-28

● EASE OF USE: Fixed Unity Gain Configuration

● ±4.5V to ±18V SUPPLY RANGE

APPLICATIONS

● INDUSTRIAL PROCESS CONTROL:

Transducer Isolator, Isolator for Thermo-

couples, RTDs, Pressure Bridges, and

Flow Meters, 4-20mA Loop Isolation

● GROUND LOOP ELIMINATION

● MOTOR AND SCR CONTROL

● POWER MONITORING

● PC-BASED DATA ACQUISITION

● TEST EQUIPMENT

DESCRIPTION

The ISO124 is a precision isolation amplifier incorporating a

novel duty cycle modulation-demodulation technique. The

signal is transmitted digitally across a 2pF differential capaci-

tive barrier. With digital modulation, the barrier characteris-

tics do not affect signal integrity, resulting in excellent reliabil-

ity and good high-frequency transient immunity across the

barrier. Both barrier capacitors are imbedded in the plastic

body of the package.

The ISO124 is easy to use. No external components are

required for operation. The key specifications are 0.010%

max nonlinearity, 50kHz signal bandwidth, and 200µV/°C

drift. A power supply range of ±4.5V to ±18V and

quiescent currents of ±5.0mA on V

and ±5.5mA on V

make these amplifiers ideal for a wide range of applications.

The ISO124 is available in DIP-16 and SO-28 plastic surface

mount packages.

Precision Lowest-Cost

ISOLATION AMPLIFIER

OUT

–V

Gnd 2

–V

Gnd 1

ISO124

SBOS074C – SEPTEMBER 1997 – REVISED SEPTEMBER 2005

www.ti.com

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

Summary of content (19 pages)

PAGE 1
ISO124 ISO ISO 124 124 SBOS074C – SEPTEMBER 1997 – REVISED SEPTEMBER 2005 Precision Lowest-Cost ISOLATION AMPLIFIER FEATURES APPLICATIONS ● 100% TESTED FOR HIGH-VOLTAGE BREAKDOWN ● RATED 1500Vrms ● HIGH IMR: 140dB at 60Hz ● 0.010% max NONLINEARITY ● BIPOLAR OPERATION: VO = ±10V ● DIP-16 AND SO-28 ● EASE OF USE: Fixed Unity Gain Configuration ● ±4.
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ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Supply Voltage ................................................................................... ±18V VIN ......................................................................................................±100V Continuous Isolation Voltage ..................................................... 1500Vrms Junction Temperature .................................................................... +150°C Storage Temperature .....................
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ELECTRICAL CHARACTERISTICS At TA = +25°C , VS1 = VS2 = ±15V, and RL = 2kΩ, unless otherwise noted. ISO124P, U PARAMETER ISOLATION Rated Voltage, continuous ac 60Hz 100% Test (1) Isolation Mode Rejection Barrier Impedance Leakage Current at 60Hz GAIN Nominal Gain Gain Error Gain vs Temperature Nonlinearity(2) CONDITIONS MIN MAX UNITS 0.5 Vac Vac dB Ω || pF µArms 1500 2400 1s, 5pc PD 60Hz 140 1014 || 2 0.18 VISO = 240Vrms VO = ±10V 1 ±0.05 ±10 ±0.
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TYPICAL CHARACTERISTICS At TA = +25°C, and VS = ±15V, unless otherwise noted.
PAGE 5
TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, and VS = ±15V, unless otherwise noted. ISOLATION LEAKAGE CURRENT vs FREQUENCY PSRR vs FREQUENCY 100mA 60 54 Leakage Current (rms) PSRR (dB) 10mA 40 +VS1, +VS2 –VS1, –VS2 20 1mA 1500Vrms 100µA 10µA 240Vrms 1µA 0.
PAGE 6
THEORY OF OPERATION The ISO124 isolation amplifier uses an input and an output section galvanically isolated by matched 1pF isolating capacitors 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.
PAGE 7
above 250kHz, the behavior is similar to that of a sampling amplifier. The typical characteristic “Signal Response to Inputs Greater Than 250kHz” shows this behavior graphically; at input frequencies above 250kHz, the device generates an output signal component of reduced magnitude at a frequency below 250kHz. This is the aliasing effect of sampling at frequencies less than 2 times the signal frequency (the Nyquist frequency).
PAGE 8
C2 1000pF Isolation Barrier R1 4.75kΩ VIN R2 9.76kΩ OPA237 VOUT = VIN ISO124 –VS2 C1 220pF +VS2 Gnd2 Gnd1 –VS1 +VS1 10µH 10µH ±VS1 10µH 10µH 1µF ±VS2 1µF 1µF 1µF 1µF 1µF 1µF 1µF FIGURE 4. Optional π Filter to Minimize Power-Supply Feedthrough Noise; Output Filter to Remove 500kHz Carrier Ripple. For more information concerning output filters refer to Application Notes SBOA012 and SBFA001. This Section Repeated 49 Times.
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+15V 2 10.0V 6 REF102 Thermocouple R4 R1 27kΩ +15V –15V +15V –15V +15V Isothermal Block with 1N4148(1) 1 2 2 7 ISO124 +In 1 RG 1MΩ 4 R2 8 INA114 or INA128 9 6 10 15 7 VOUT 8 5 –In 4 16 3 R3 100Ω R5 50Ω –15V R6 ISA TYPE 100 Zero Adj E Ground Loop Through Conduit J NOTE: (1) –2.1mV/°C at 2.00µA. K T MATERIAL SEEBACK COEFFICIENT (µV/°C) R2 (R3 = 100Ω) R4 (R5 + R6 = 100Ω) 58.5 3.48kΩ 56.2kΩ 50.2 4.12kΩ 64.9kΩ 39.4 5.23kΩ 80.6kΩ 38.0 5.49kΩ 84.
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FIGURE 8. Isolated Power Line Monitor. 10 www.ti.com ISO124 SBOS074C 1 16 15 0.47µF 0.47µF RD2 RD1 DCP011515DB or DCV011515D 0.47µF 2 VL 5 6 1 ISO124 RS 7 2 V– 10 9 V+ Load IL 8 7 1 2 DCP011515DB or DCV011515D 0.47µF 0.47µF 5 6 1 ISO124 0.47µF 15 16 7 2 V– 10 9 V+ 8 7 Y X 2kΩ 2kΩ 0.
PAGE 11
+15V 9 VIN, up to ±10V Swing 7 ISO124 VOUT 8 10 2 1 16 –15V 0.1µF 0.1µF +5V Regulator MC78L05 –5V Regulator MC79L05 3 1 1 2 0.47µF 2 3 0.47µF 0.47µF 7 6 5 2 1 DCP011515DB or DCV011515D NOTE: The input supplies can be subregulated to ±5V to reduce PSR related errors without reducing the ±10V input range. FIGURE 9. Improved PSR Using External Regulator.
PAGE 12
1 5 2 6 7 DCP011515DB or DCV011515D 0.47µF 0.47µF 0.47µF VIN –15V, 20mA Input Gnd +15V, 20mA 16 15 10 V– Gnd VIN Input Section V+ Auxiliary Isolated Power Output V+ Output Section ISO124 V– 1 9 VO 2 Gnd 7 +15V 8 Output Gnd –15V VO FIGURE 11. Input-Side Powered ISO Amp. +15V Gnd 1 DCP011515DB or DCV011515D 7 6 5 5 2 2 1 0.47µF 0.47µF 0.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 24-Jul-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device ISO124U/1K Package Package Pins Type Drawing SOIC DVA 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 330.0 24.4 Pack Materials-Page 1 10.9 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 18.3 3.2 12.0 24.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 24-Jul-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ISO124U/1K SOIC DVA 8 1000 367.0 367.0 45.
PAGE 17
MECHANICAL DATA MPDI072 – AUGUST 2001 NVF (R-PDIP-T8/16) PLASTIC DUAL-IN-LINE 0.775 (21,34) 0.735 (18,67) D 16 9 0.280 (7,11) 0.240 (6,10) Index Area 1 D 8 0.195 (4,95) 0.115 (2,92) 0.045 (1,14) 0.030 (0,76) 0.210 (5,33) MAX 0.070 (1,78) 0.045 (1,14) 0.325 (8,26) 0.300 (7,62) C Seating Plane Base Plane E 0.005 (0,13) MIN 4 PL D 1/2 Lead 0.150 (3,81) 0.115 (2,92) 0.100 (2,54) 0.022 (0,56) 0.014 (0,36) 0.010 (0,25) M 0.015 (0,38) MIN C 0.300 (7,63) 0.014 (0,36) 0.008 (0,20) 0.
PAGE 18
MECHANICAL DATA MPDS105 – AUGUST 2001 DVA (R-PDSO-G8/28) PLASTIC SMALL-OUTLINE C A 18,10 17,70 0,25 M B M 28 15 B 7,60 7,40 10,65 10,01 D Index Area 1 14 2,65 2,35 C 0,75 0,25 x 45° Seating Plane 1,27 G 0,51 0,33 0,30 0,10 0,10 0,32 0,23 0,25 M C A M B S 0°–8° F 1,27 0,40 4202103/B 08/01 NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body length dimension does not include mold flash, protrusions, or gate burrs.
PAGE 19
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