Le blog de l'entreprise Mingjiada Stock Supply (TI) AMC3330: Precision Enhanced Isolation Amplifier with Integrated DC/DC Converter

Precise voltage sensing in high-voltage systems often presents the dual challenges of design complexity and safety isolation. Shenzhen Mingjiada Electronics Co., Ltd. currently stocks the AMC3330 series of precision isolated amplifiers from Texas Instruments (TI). Featuring an integrated isolated DC/DC converter and enhanced isolation characteristics, this device is specifically designed to simplify high-voltage sensing designs, making it an ideal choice for applications such as motor drives and photovoltaic inverters.

AMC3330 Product Overview

The AMC3330 is a precision isolated amplifier that combines high performance with ease of use. Its most notable feature is the integration of an isolated DC/DC converter within a single chip, allowing it to be powered directly from the low-voltage side (such as a 3.3V or 5V supply) without the need to design additional complex and costly isolated power supply modules. This design significantly simplifies the system power architecture, saves PCB space and shortens product development cycles.

The device utilises an enhanced capacitive isolation layer and has passed stringent safety certifications such as VDE 0884-17 and UL1577. It reliably isolates different parts of the system operating at different common-mode voltages, effectively protecting the low-voltage control domain from damage caused by the high-voltage side.

AMC3330 Key Features and Specifications

Leveraging Texas Instruments’ advanced manufacturing processes, the AMC3330 delivers outstanding performance in terms of accuracy, isolation and reliability. Its key parameters are as follows:

Input voltage range: ±1 V (optimised for high-impedance voltage signal sources)

Fixed gain: 2.0

Power supply: 3.3 V or 5 V single supply (integrated isolated DC/DC)

Gain error: ±0.2% (maximum)

Gain temperature drift: ±45 ppm/°C (maximum)

Offset voltage: ±0.3 mV (maximum), ±50 µV (typical)

Offset voltage temperature drift: ±4 µV/°C (maximum)

Non-linearity: ±0.02% (maximum)

Isolation withstand voltage: 4250 Vrms (1 minute, UL1577 standard)

6000 VPK (reinforced, VDE 0884-17 standard)

Common-mode transient immunity (CMTI): 85 kV/µs (minimum)

Bandwidth (-3 dB): 375 kHz

Operating temperature range: -40 °C to +125 °C

Package: SOIC-16 (DWE)

Why choose the AMC3330?

1. Integrated DC/DC converter

This is the device’s key advantage. Whilst traditional isolation amplifiers require a separate isolated power supply, the AMC3330 integrates a transformer driver internally and operates with just a single low-side power supply, significantly reducing BOM costs and design complexity.

2. High accuracy and stability

Extremely low gain error and temperature drift ensure high-precision voltage monitoring across the full temperature range, which is crucial for industrial and automotive systems requiring stringent control.

3. Robust Immunity to Interference

With common-mode transient immunity (CMTI) of up to 85 kV/µs, it maintains precise signal transmission even in harsh environments rife with switching noise—such as motor drives and inverters—and is highly resistant to interference.

Typical Application Areas

The AMC3330’s high precision and strong isolation characteristics make it widely applicable in the following high-voltage scenarios requiring precise voltage monitoring:

Motor drives: For phase voltage and DC bus voltage detection in industrial variable-frequency drives and servo drives.

Photovoltaic (PV) inverters: Precise monitoring of PV panel input voltage and inverter DC bus voltage.

Electric vehicles (EVs) and charging infrastructure: Battery management system (BMS) battery pack voltage monitoring and isolated sampling for on-board chargers (OBCs).

Power Transmission and Metering: For monitoring high-voltage power distribution systems and voltage measurement in smart meters.

Industrial Automation and Protection Relays: Enables isolated acquisition of high-voltage signals and system protection.

About Mingjiada Electronics

Shenzhen Mingjiada Electronics Co., Ltd. is a specialist distributor of electronic components, specialising in the supply of genuine, in-stock products covering core sectors such as automotive electronics, industrial control, AI and robotics. The company maintains a substantial stock of products from leading brands such as TI (Texas Instruments), supporting both small-batch sample purchases and large-volume orders, and is committed to providing customers with an efficient and convenient component procurement experience.

Contact us to purchase samples or request a quotation:

Contact: Mr Chen

Tel: +86 13410018555 / 86-755-83294757

Email: sales@hkmjd.com

Address: 1239–1241, New Asia Guoli Building, Zhenzhong Road, Futian District, Shenzhen

Tags: AMC3330DWER, AMC3330DWE, AMC3330DW, AMC3330D, AMC3330