TI AMC1305L25DWR

The AMC1305 is a high-precision delta-sigma (ΔΣ) modulator that isolates the output from the input circuit through a capacitive dual isolation barrier with high magnetic field immunity. Per DIN V VDE V 0884-10, UL1577, and CSA standards, the isolation barrier is certified to provide enhanced isolation up to 7000 V (specific combinations may represent complex voltage conditions). When used with an isolated power supply, the device prevents noise currents on common-mode high-voltage lines from entering the local system ground and interfering with or damaging low-voltage circuits. The AMC1305 is optimized for direct connection to shunt resistors or other low-voltage signal sources, offering excellent DC and AC performance. Shunt resistors are commonly used for current sensing in motor drives, green energy generation systems, or other industrial applications. By using an appropriate digital filter (i.e., integrated in the TMS320F2837x) to decimate the bitstream, the device achieves 16-bit resolution with 85 dB (13.8 ENOB) dynamic range at a 78 kSPS data rate. On the high side, the modulator is powered by a nominal 5 V (AVDD) supply, while the isolated digital interface is powered by a 3.3 V or 5 V supply (DVDD). The AMC1305 is available in a wide-body small-outline integrated circuit (SOIC)-16 (DW) package with an operating temperature range of -40°C to +125°C.

• Pin-compatible family optimized for shunt resistor-based current measurement
• Input voltage range: ±50mV or ±250mV
• CMOS or LVDS digital interface options
• Excellent DC performance for system-level high-accuracy sensing
• Offset error: ±50μV or ±150μV (maximum)
• Offset drift: 1.3μV/℃ (maximum)
• Gain error: ±0.3% (maximum)
• Gain drift: ±40ppm/℃ (maximum)
• Safety-relevant certifications
• 7000Vₚₖ reinforced isolation per DIN V VDE V0884-10 (VDE V 0884-10): 2006-12
• 5000 VRMS isolation for 1 minute per UL 1577
• CAN/CSA No. 5A component acceptance notice, IEC60950-1 and IEC 60065 end equipment standards
• Transient immunity: 15kV/μs (minimum)
• High immunity to magnetic fields
• External 5MHz to 20MHz clock input for easier system-level synchronization
• Operation over extended industrial temperature range

• Current sensing based on shunt resistors for the following applications
• Industrial motor drives
• Photovoltaic inverters
• Uninterruptible power supplies
• Isolated voltage sensing