WhatsApp:+852-69577225AMC1305M25DWR Isolated Modulator for High-Voltage Signal Monitoring
6/9/2025 10:46:54 AM
AMC1305M25DWR Overview
The AMC1305M25DWR is a high-precision, reinforced isolated delta-sigma modulator developed by Texas Instruments for reliable current sensing in high-voltage, noisy environments. It supports a ±250 mV differential input, making it ideal for use with low-resistance shunt resistors. Built around a second-order, switched-capacitor ΔΣ architecture, it delivers 16-bit resolution with a dynamic range of 85 dB at a 78 kSPS output rate.
Engineered for robustness, the device provides reinforced isolation rated at 7000 Vpeak (per DIN VDE V 0884-11) and 5000 VRMS (per UL1577). It also boasts high common-mode transient immunity (CMTI) of at least 15 kV/μs, making it suitable for harsh industrial environments. Operating across –40°C to +125°C with low power consumption, the AMC1305M25DWR is housed in a 16-pin SOIC package and supports external clock synchronization from 5 MHz to 20 MHz.
If you are interested in purchasing the AMC1305M25DWR, feel free to contact us for pricing and availability.
AMC1305M25DWR Simplified Schematic
The simplified schematic diagram illustrates how the AMC1305M25DWR is used for isolated current sensing in a high-voltage motor control system. The circuit shows a shunt resistor (RSHUNT) connected to the negative rail of a half-bridge, which converts load current into a small voltage signal. This differential voltage is fed into the analog inputs (AINP and AINN) of the AMC1305, a precision isolated delta-sigma modulator.
The AMC1305 is powered by a floating 5V supply on its high-side (AVDD), and its low-side digital interface (DVDD) is powered by either a 3.3V or 5V supply. The modulated output (DOUT) and clock input (CLKIN) enable digital isolation and data transmission to the TMS320F2837x microcontroller, which reconstructs the current signal using a sinc filter. The isolation barrier between the analog and digital domains (marked by AGND and DGND) ensures safe operation in high-voltage environments. Overall, this schematic demonstrates a high-precision, galvanically-isolated current sensing solution ideal for motor drives, solar inverters, or power monitoring systems.
AMC1305M25DWR Features
• Input Voltage Range: ±250 mV differential, optimized for shunt resistor-based current measurements.
• Resolution: 16 bits, delivering a dynamic range of 85 dB (13.8 ENOB) at a data rate of 78 kSPS.
• Modulator Type: Second-order, switched-capacitor, feed-forward delta-sigma modulator.
• Isolation: 7000 Vpeak reinforced isolation per DIN VDE V 0884-11, 5000 VRMS isolation for 1 minute per UL1577.
• Common-Mode Transient Immunity (CMTI): Minimum of 15 kV/μs,reliably operate in high-voltage environments.
• Clock Input: Supports external clock frequencies from 5 MHz to 20 MHz for easier system-level synchronization.
• Operating Temperature Range:It operates effectively across a wide temperature range of –40°C to +125°C, making it suitable for demanding industrial.
• Power Consumption: Typical consumption of 36.1 mW, contributing to energy-efficient system performance.
• Package: 16-pin SOIC (SOIC-16), suitable for surface-mount applications.
AMC1305M25DWR Applications
• Industrial Motor Drives: Precise phase current measurement for efficient motor control.
• Photovoltaic (Solar) Inverters: DC link and output current monitoring in solar energy systems.
• Uninterruptible Power Supplies (UPS): Reliable current sensing for power backup systems.
• Isolated Voltage Sensing: High-voltage monitoring using resistor dividers and shunt resistors.
• Frequency Inverters: Current and voltage feedback in variable frequency drive systems.
• Power Converters: Accurate current sensing in AC/DC and DC/DC converters.
• Battery Management Systems: Monitoring charge/discharge currents in energy storage solutions.
• Hybrid and Electric Vehicles: High-side current sensing in automotive power electronics.
• Data Acquisition Systems: High-resolution signal conversion in industrial measurement setups.
• Energy Metering: Precise current and voltage measurement for billing and monitoring.
• Industrial Automation: Process control and monitoring in automated systems.
• Medical Equipment: Safe and accurate current sensing in diagnostic and therapeutic devices.
AMC1305M25DWR Pin Configurations and Functions
The layout diagram of the AMC1305M25DWR demonstrates the recommended PCB design practices to ensure proper isolation and signal integrity. The device is divided into two distinct zones: the high-side area on the left (gray) and the controller-side area on the right (green), separated by a clearance zone that must remain free of any conductive material. This isolation barrier is critical for maintaining reinforced galvanic isolation between the high-voltage analog inputs and the low-voltage digital output.
Analog input signals from the shunt resistor are routed into the AINP and AINN pins on the high-side, with proper grounding at AGND. Decoupling capacitors (e.g., 0.1 µF SMD 0603) are placed close to AVDD and DVDD pins to stabilize the power supply and filter high-frequency noise.
On the controller side, digital signals such as CLKIN and DOUT are routed to the MCU. Grounding is carefully handled with DGND and vias to the ground plane to minimize noise coupling. The layout ensures optimal performance by maintaining isolation integrity, minimizing EMI, and adhering to the high-voltage design rules.
This package outline of the AMC1305M25DWR illustrates the mechanical dimensions and pin layout for its 16-SOIC (Small Outline Integrated Circuit) body. The drawing shows a top view, side view, and cross-section detail, which help ensure accurate PCB footprint design and mechanical integration.
AMC1305M25DWR Package Outline
The body measures approximately 10.3 mm × 7.6 mm, with a maximum height of 2.65 mm, making it compact for high-density layouts. The pin pitch is 1.27 mm, and pin 1 is clearly marked for proper orientation. Detail A provides a close-up view of the gull-wing lead form, emphasizing the typical lead standoff height and bending geometry for reliable soldering.
The layout also defines seating plane, pin spacing, and tolerances to ensure compatibility with automated assembly processes. Proper adherence to these dimensions is essential for thermal management, electrical isolation, and mechanical stability in power-sensitive applications like motor drives or inverters.
AMC1305M25DWR Manufacturer
The AMC1305M25DWR is manufactured by Texas Instruments (TI), a leading global semiconductor company renowned for its high-performance analog and embedded processing products. This particular component is part of TI's precision isolation portfolio, designed for accurate current sensing in high-voltage, noisy environments.
Conclusion
The AMC1305M25DWR stands out as a reliable and efficient choice for high-accuracy, isolated current sensing across a wide range of industrial and automotive applications. With its reinforced isolation, high CMTI rating, and compatibility with low-resistance shunt resistors, it ensures safety and signal integrity in demanding environments. Its integration-friendly SOIC-16 package, flexible clocking options, and extensive certifications make it a practical solution for motor drives, solar inverters, power supplies, and more.
- payment
Online