SH Series: ADC differential signal isolation amplifier IC

6kV isolation amplifier for shunt current differential sampling

Prices in the link are for reference only. Contact the staff at the end of the article for exact pricing.

We accept OEM customization as well as ODM development, design and manufacturing services.

Product Features:

● Differential input voltage range: ±50 mV or ±250 mV with selectable gain

● Low nonlinearity and temperature drift: 0.05%, ±1.5ppm/℃ (Typical)

● Low gain error and temperature drift: ±0.2% (Maximum), ±50ppm/℃ (Maximum)

● Output signals: ±2.05V / ±3.3V / ±5V / ±10V

● Low cost, compact size, flame-retardant standard DIP-14Pin package

● Built-in multi-channel isolated DC/DC power supplies; high CMTI >100KV/μs

● 6000VDC triple isolation between auxiliary power supply, signal input and signal output

● Auxiliary power supply: single DC power input options of 3.3V / 5V / 12V / 15V / 24V

● Optional mounting methods: DIN35 rail mounting or PCB soldering mounting

● Industrial-grade wide operating temperature range: -40 ~ +85 ℃ 

Typical Applications:

● Industrial motor control and driving

● Isolated switching power supplies

● Uninterruptible Power Supplies (UPS)

● EV charging piles & photovoltaic inverters

● Isolation for front-end ADC sampling in motor control systems

● Energy storage system control

● Server and communication power supplies

● Industrial frequency converters and servo drives

● Industrial control equipment & new-energy three-electric systems 

Overview:

The SH-series differential signal isolation amplifier IC for ADC sampling is an enhanced 6kV isolation amplifier with built-in 3-terminal isolated DC-DC power supply, specially designed for shunt-based differential current sampling in control systems. Featuring selectable gain and a function converting analog differential input to single-ended analog output, it accepts widely-used full differential input signals such as ±50mV and ±250mV.

The core function of the SH-series isolation amplifier for ADC differential sampling is to precisely amplify weak millivolt-level voltage signals generated by shunt resistors in high-voltage environments or scenarios with ground potential differences, safely transmit processed signals to low-voltage acquisition systems via galvanic isolation, block damage caused by common-mode high voltage, and eliminate ground loop interference.

Independently isolated power supplies, high-precision differential operational amplifiers, and capacitance-reinforced isolation barriers are integrated inside the SH series. Powered by a single supply, the device requires no external isolated power supply, external op-amps or potentiometer conditioning circuits. It can directly capture tiny voltage readings across shunt resistors in control systems and output standardized analog voltage signals.

Full galvanic isolation is realized among the low-voltage supply side, high-voltage sampling side and signal output side, thoroughly eliminating common-mode interference, ground loop interference and high-voltage crosstalk in industrial bus, power battery and high-voltage frequency conversion scenarios. It serves as a cost-effective, highly reliable and high-precision DC current sampling alternative to ordinary non-isolated op-amps, external isolation modules and Hall effect sensors.

The integrated 6kV high-isolation distributed DC-DC power supply enables single-supply operation on the low-voltage side and eliminates the need for separate isolated power supplies for the high-voltage side, greatly simplifying circuit design and reducing PCB footprint. Low offset voltage and low gain drift guarantee stable measurement accuracy across the full operating temperature range, while high common-mode transient immunity ensures accurate and reliable sampling measurements even in environments with high-power switching devices (e.g., power supply and motor control applications).

SH-series modules are user-friendly and support two installation forms: PCB soldering and standard DIN35 rail clamping. Rail-mounted variants support isolation, distribution and amplification of analog signals for on-site industrial current monitoring in configurations including 1-input-1-output, 1-input-2-output and 2-input-2-output. The products comply with industrial-grade environmental requirements, tolerating humidity, vibration and wide temperature variation from -40 ℃ to +85 ℃. They are widely adopted in industrial motor control & driving, high-power isolated switching power supplies, UPS, energy storage systems, AI servers, integrated communication power supplies, charging piles, photovoltaic inverters, industrial frequency converters & servo systems, intelligent industrial control equipment, new-energy three-electric systems and many other fields.

Absolute Maximum Ratings：

(Long-term operation under absolute maximum ratings will shorten the service life of the product; exceeding the maximum ratings will cause irreversible permanent damage.)

Recommended Operating Conditions：

Electrical Specifications：

Note: Customers with special requirements for the load capacity of the product voltage and current signals shall make separate instructions when placing orders. 

Model Definition：

 Selection Examples:

Example 1: Signal input: ±50 mV; Signal output: ±5 V; Auxiliary power supply: 24 VDC; PCB soldering IC package module. Model No.: SH-050-P1-O4

Example 2: Signal input: ±250 mV; Signal output: ±2.05 V; Auxiliary power supply: 12 VDC; PCB soldering IC package module. Model No.: SH-250-P2-O2

Example 3: Signal input: ±250 mV; Signal output: ±10 V; Auxiliary power supply: 5 VDC; DIN35 rail-mounted, 1-input 1-output structure. Model No.: DIN 1X1 SH-250-P3-O5

Example 4: Signal input: ±250 mV; Signal output: ±3.3 V; Auxiliary power supply: 5 VDC; DIN35 rail-mounted, 2-input 2-output structure. Model No.: DIN 2X2 SH-250-P3-O3

Outline Dimensions & PCB Layout Reference Dimensions (Standard DIP-14 Package):

Pin Function Description:

Typical Applications:

1.             SH series modules are used to amplify the voltage drop across the shunt resistor (Rshunt), and then transmit the processed signal to the low-voltage side for the control circuit. Thanks to the differential input structure and high CMTI of SH series modules, reliable and precise measurement can be realized in high-noise and high-power switching scenarios such as industrial motor drives. During switching operations, the voltage between the shunt resistor and -VBUS may swing from 0 V up to high bus voltage, making electrical isolation indispensable. The SH series modules provide electrical isolation up to 6 kVDC, making them highly suitable for high-voltage industrial applications. The figure below illustrates multi-channel current sampling applied in inverters.

2.    The figure below shows the typical application of single-channel current detection.

The high-voltage sampling input terminal, low-voltage power supply terminal and signal output terminal are fully isolated, eliminating crosstalk among high-voltage ground, power ground and signal ground. This module is applicable to floating busbars, floating battery packs and high-voltage inverter scenarios. For the high-side GND1 pin, it can be directly shorted to INN; alternatively, it can be connected to other circuit nodes on the premise that the common-mode voltage stays within the recommended range.When a 4-terminal shunt resistor is adopted, INP and INN shall be wired to the inner pins of the shunt resistor via Kelvin connection.

Typical Applications of DIN35 Rail-mounted Single/Multi-channel Current Sampling Isolation Amplifiers:

SH series shunt current sampling isolation amplifiers with integrated isolated power supply can be customized into standard DIN35 rail-mounted single-channel or multi-channel versions. Such rail-mounted isolation amplifiers integrate one or multiple SH series modules internally. Overvoltage, overcurrent, reverse connection and other protection circuits are added to the power input terminals, signal input terminals and signal output terminals, which enables convenient on-site direct wiring for users.These products can meet the on-site requirements for isolated amplification, acquisition and monitoring of single-channel and multi-channel analog signals between shunt resistors and controllers, including DIN 1×1 (1-input 1-output), DIN 1×2 (1-input 2-output), DIN 2×2 (2-input 2-output) and other configurations.

High-Voltage Isolation Safety Test Method：

High-Voltage Isolation Safety Test Methods & Precautions：

▲Wire the device as shown in the above diagram, and set the rated high voltage of the hipot tester according to the product’s specified isolation voltage parameters. Exercise extreme caution during testing to prevent electric shock hazards. Test Environment: Ambient temperature \(T_A=25^\circ\text{C}\), relative air humidity < 75%.

▲Operators conducting high-voltage tests must wear rubber electrical insulating gloves, and a rubber insulating mat shall be laid on the ground to protect against electric shock.

▲The enclosure of the high-voltage hipot tester must be reliably grounded. Testing is prohibited under high-temperature, humid or dusty environmental conditions.

▲Before connecting the Device Under Test (DUT) to the hipot tester, confirm that the high-voltage output is set to 0 V and the test function is under the RESET state; contact with irrelevant objects is forbidden.

▲It is strictly prohibited to touch the tested sample, test leads or high-voltage output terminals while the instrument is in high-voltage test mode and before high-voltage discharge is fully completed.

▲The isolation withstand voltage test procedure is illustrated in the above diagram: short all input pins together and all output pins together respectively, then apply the rated test voltage for 1 minute.

▲In accordance with the product’s rated isolation voltage, manually adjust the tester output voltage to rise gradually from 0 V up to the rated value, and maintain the rated voltage for 1 minute.

▲The dielectric withstand voltage test is inherently a destructive test for insulating materials. Repeated high-voltage tests on a single device should be minimized. If multiple rounds of inspection and certification are required for different customers, the following rules shall be followed: For batch products, the first test shall adopt the full rated voltage specified in the datasheet. For all subsequent repeated tests, the test voltage and test times shall be reduced to 0.7 times the rated isolation voltage. Otherwise, irreversible permanent damage may be caused to the product after repeated high-voltage stress.

Shenzhen Zhikongquan Technology Co., Ltd.：Drawing on 28 years of profound industry experience and accumulated resources, we focus on sectors including industrial automation, sensors, industrial instruments, and robotics. We have integrated manufacturing resources from over a thousand manufacturers. We are committed to promoting Made in China and Created in China to the world, delivering high-quality, cost-effective Chinese products to manufacturing enterprises across the globe. only a selection of our products is listed on our catalog; feel free to contact us for more product information anytime.

Address: Room 1501, Global Logistics Center, No.1 Huanan Avenue, Pinghu Sub-district, Longgang District, Shenzhen City, Guangdong Province, P.R.China

Contact Person: Mulan.Liu

Title: Operations Director

Email: info@zgznh.com

          sales1@zgznh.com

https://www.zgznh.com/mall/list-1505.html

WeChat: 13302910296