Description: The ISO Series Isolation Amplifier is a hybrid integrated circuit (IC) that isolates and converts analog signals proportionally. It is divided into active (including auxiliary power) and passive. ISO 4-20mA Series—Two-Wire Passive 4-20mA Signal Isolation Conditioning IC
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The passive IC contains a current signal modulation and demodulation circuit, a signal coupling isolation conversion circuit, etc., and a small input equivalent resistance, so that the input voltage of the IC reaches an ultra-wide range (7.5-32V), so that the user does not need to externally connect. Power supply to achieve long-distance signal transmission without distortion. The internal ceramic substrate, printed resistor technology and new technology isolation measures enable the device to meet the 3KVAC insulation voltage and industrial grade wide temperature, humidity, vibration and harsh environment requirements. ISO 4-20mA series products are very convenient to use, no need to connect any components to achieve 4-20mA current loop isolation or signal one in two out, two in two out and other conversion functions.
The active IC is a hybrid integrated circuit that integrates a highly isolated DC/DC power supply and a high performance linear optocoupler on the same chip. In addition to powering the internal amplifier circuit, the chip can also provide two sets of isolated positive and negative DC power supplies and two sets of 5VDC regulated reference sources to the external (signal input and output), which are designed for external circuit expansion, such as electricity. User-specific circuits such as bridge circuits and small-signal preamplifier circuits. This series of products has a wide signal bandwidth of 20KHZ, which can isolate, condition and transform 0~±10VDC bidirectional DC signals or 0~5VAC AC signals. The IC is small in size and easy to use, allowing for analog signal (I/I I/V V/I V/V) isolation and conversion with very few external components.
Main application areas: analog signal data acquisition, isolated transmission and power supply, industrial field signal isolation transmission and transformation, ground line interference suppression, signal remote distortion-free transmission, instrumentation and sensor signal isolation. Power equipment and medical instrument safety barriers.
Product System:
ISO-Ax-Px-Ox Series—-DC Current Signal (I/V I/I) Isolation Amplifier IC
ISO-Ux-Px-Ox Series—-DC Voltage Signal (V/I V/V) Isolation Amplifier IC
ISO1001 /1002 Series - DC bidirectional or AC signal isolation amplifier IC
Product Features:
Accuracy class: 0.1, 0.2, 0.5 Extremely high linearity over the full range (non-linearity <0.2%)
GB standard signal: 0-10mA/0-20mA/4-20mA/0-5V/0-10V/0-±5V/1-5V input/output. 3KV three isolated single power supply with low input impedance and high output load signal input/output/auxiliary power supply, providing users with isolated power supply at signal input or output. Low cost, small size, standard single column SIP12 and dual column DIP24 Foot IC package industrial grade operating temperature range, UL-94 compliant flame retardant vacuum potting
I. Overview <br> The signal isolation technique is to make the analog signal transmit without a current connection across the barrier between the transmitting and receiving ends. This allows the difference between the ground and reference levels outside the transmit and receive terminals to be as high as several thousand volts and prevents loop currents between different ground potentials that can compromise the signal. The noise of the signal ground can damage the signal. Isolation separates the signal into a clean signal subsystem that isolates the sensor, instrumentation, or control system from the power supply, ensuring safe, reliable, and stable operation of the entire system.
In another application, the electrical connection between the reference levels isolates to create a current path that is unsafe for the operator or patient.
Signal isolation devices rely on no transmitters and receivers to cross the isolation barrier. This device was used for digital signals, but linearization problems forced analog signal isolation to be implemented using devices such as transformers, optocouplers, capacitors, or photovoltaic cells.
Analog signal isolation: In many systems, analog signals must be isolated. The circuit parameters considered for analog signals are completely different from digital signals.
Analog signals are usually considered first: accuracy or linearity, frequency response, noise, etc.
Then there is the requirement for the power supply, which requires high isolation, high precision, and low noise, especially for the input stage. It should also be noted that the basic accuracy or linearity of the isolation amplifiers cannot be improved by relying on the corresponding application circuit, but these circuits can reduce noise and reduce input stage power requirements.
For power supply noise interference, a modulated carrier can be used to cause the analog signal to cross this barrier. A two-wire passive signal isolation amplifier such as ISO 4-20 simplifies analog isolation. The input signal is modulated by duty cycle and digitally transmitted across the barrier. The output portion receives the modulated signal, converts it back to the analog signal and removes the ripple components inherent in the modulation/demodulation process.
Another problem with signal isolation is the power dissipation required to isolate the input stage of the amplifier, and the input impedance of the isolation amplifier and its own equivalent resistance are the key to the problem. The output stage is usually referenced to the chassis or ground, and the input stage typically floats at another potential. Therefore, the power to the input stage must also be isolated. A single power supply (5V/12V/15V/24V) is usually used instead of the ideal positive and negative dual power supplies.
Second, the principle introduction
Through repeated experiments and verification, this series of products has achieved the intended purpose. BRIEF DESCRIPTION OF THE DRAWINGS:
3. Typical electrical performance indicators: 
Third, the typical application technology
Figure 3 is a schematic diagram of the typical application of the ISO series isolation amplifiers, where the input and output amplifiers are follow-up. At this time, the overall amplification factor of the isolation amplifier is 20 times, and R1, R2, and W1 are zero-adjusting circuits, and R1=5.1K R2=2K W1=2K (multi-turn potentiometer). The auxiliary power supply is +12VDC, R3 and W3 are gain adjustment circuits, R3=39K W3=10K (multi-turn potentiometer) 
Signal input amplifier design:
Figure 4 shows the input amplifier circuit. When the input amplifier output (21-pin COM terminal) is 0.5V, the output is 5V (when the 13 and 14 pins are shorted). Input inverting amplifier circuit:
Figure 5 is the wiring diagram of the input inverting amplifier circuit, where the magnification is: Kin = - R11/R12 R3 = R11//R12
For example, when the input Vin is 0~-100mV and the output is 0~5V, it can be taken as follows: R11=50K R12=10K R13=8.3K Magnification: Kin=-50/10=-5 Input in-phase amplifier circuit:
Figure 6 is the wiring diagram of the input in-phase amplifier circuit, the magnification is: Kin=1+R2/R1 
ISO 1001 has designed an output amplifier for the user. The principle is shown in Figure 7. FB is the inverting input of the amplifier. When the 13 and 14 pins are shorted, the output amplification factor Kout=1+33/10=4.3, due to The isolation amplifier section has a magnification of 2.35 times, so the total magnification K = 4.3 * 2.35 = 10.1.
When the COM terminal voltage of the input amplifier does not reach 0.5V, the amplification factor can be adjusted by the output amplifier. As shown in Figure 8, W2 can take 1~100K (multi-turn potentiometer). 
Fourth, a typical application example
Application Example 1 : Directly measure high-voltage signal input with isolation amplifier: 0~±100VDC DC voltage signal output: 0~±10V DC Isolated signal takes R4=100K R0=390 W1=200 (multi-turn potentiometer)
Take R3=39K W3=10K (multi-turn potentiometer) R1=5.1K R2=2K W2=2K (multi-turn potentiometer)
When the input signal is small, the same phase amplifying circuit of Fig. 6 can be used, so that the output of the input amplifier (ie, the voltage of the COM terminal) is between 0.45 and 0.48 V, and the rest is the same as that of FIG. 
Application Example 2 : Measuring the differential small signal of the bridge output. Wiring diagram is shown in Figure 10. Input: 0~±25mV bridge differential small signal output: 0~±10V DC Isolated signals A1, A2 and input amplifier form a data amplifier,
Taking R=100K RG=5K, the amplification factor of the data amplifier is Kin=100/5=20.
Other components of the circuit: R1=5.1K R2=2K W2=2K (multi-turn potentiometer)
Take R3=39K W3=10K (multi-turn potentiometer) 
Fourth, the product dimensions and pin description DIP 24-pin package IC size diagram, see Figure 11 DIP 24-pin package IC pin definition diagram, see Figure 12 
IC size and IC pin definition for the SIP 12-pin package, see Figure 
to sum up
With the rapid development of modern electronic technology, there are many new devices that can be developed and selected by technicians. Through the expansion of the functions of the new devices, many practical new products can be developed, which promotes the continuous upgrading of electronic products and develops toward low cost, small size, versatility and intelligence. The ISO series products of Shenzhen Shunyuan Technology Co., Ltd. have leading technologies such as low cost, small size, high precision and multi-function for similar products at home and abroad. Widely used in industrial control, medical equipment , instrumentation and other systems in the circuit design where the ground potential is very different. Each device and process in the entire product circuit is designed for unique system requirements, and the high level of performance integration of the new device allows for more complex operations that could not be done before.