The AMC1305 device is a precision, delta-sigma (ΔΣ) modulator with the
output separated from the input circuitry by a capacitive double isolation barrier that is highly
resistant to magnetic interference. This barrier is certified to provide reinforced isolation of up
to 7000 VPEAK according to the DIN V VDE V 0884-10, UL1577, and CSA
standards. Used in conjunction with isolated power supplies, the device prevents noise currents on
a high common-mode voltage line from entering the local system ground and interfering with or
damaging low voltage circuitry.
The AMC1305 is optimized for direct connection to
shunt resistors or other low voltage level signal sources and supports excellent dc and ac
performance. Shunt resistors are typically used to sense currents in motor drives, green energy
generation systems, or other industrial applications. By using an appropriate digital filter (that
is, as integrated on the TMS320F2837x)
to decimate the bit stream, the device can achieve 16 bits of resolution with a dynamic range of 85
dB (13.8 ENOB) at a data rate of 78 kSPS.
On the high-side, the modulator is supplied with a nominal voltage of 5 V (AVDD), whereas
the isolated digital interface operates from a 3.3-V or 5-V power supply (DVDD).
The AMC1305 is available in a wide-body SOIC-16 (DW) package and is specified from –40°C to +125°C.
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