Precision delta-sigma modulator is highly resistant to magnetic interference

02-02-2015 | Texas Instruments | Semiconductors

Texas Instruments (TI) has introduced the AMC1305, a precision, delta-sigma
(?S) modulator with the output separated from the input circuitry by a
capacitive double isolation barrier that is highly resistant to magnetic
interference. The barrier provides certified 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 device is
available in a wide-body SOIC-16 (DW) package with a -40C to 125C
temperature range.

The AMC1305 is optimized for direct connection to shunt resistors or other
low voltage level signal sources while supporting exceptional 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 85dB (13.8 ENOB) at a data rate of
78kSPS, says the company.

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