AMC1204 Datasheet, PDF (1/29 Pages) Texas Instruments – 20MHz, Second-Order, Isolated Delta-Sigma Modulator for Current-Shunt Measurement

AMC1204
www.ti.com
SBAS512A – APRIL 2011 – REVISED APRIL 2011
20MHz, Second-Order, Isolated Delta-Sigma Modulator
for Current-Shunt Measurement
Check for Samples: AMC1204
FEATURES
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•2 ±250mV Input Voltage Range Optimized for
Shunt Resistors
• Certified Digital Isolation:
– CSA, IEC60747-5-2, and UL1577 Approved
– Isolation Voltage: 4000V_PEAK
– Working Voltage: 1200V_PEAK
– Transient Immunity: 15kV/µs
• Long Isolation Barrier Lifetime (see
Application Report SLLA197)
• High Electromagnetic Field Immunity
(see Application Note SLLA181A)
• Outstanding AC Performance:
– SNR: 84dB (min)
– THD: –80dB (max)
• Excellent DC Precision:
– INL: ±8LSB (max)
– Gain Error: ±2% (max)
• External Clock Input for Easier
Synchronization
• Fully Specified Over the Extended Industrial
Temperature Range
DESCRIPTION
The AMC1204 is a 1-bit digital output, isolated
delta-sigma (ΔΣ) modulator that can be clocked at up
to 20MHz. The digital isolation of the modulator
output is provided by a silicon dioxide (SiO₂) barrier
that is highly resistant to magnetic interference. This
barrier has been certified to provide basic galvanic
isolation of up to 4000V_PEAK according to UL1577,
IEC60747-5-2, and CSA standards or specifications.
The AMC1204 provides a single-chip solution for
measuring the small signal of a shunt resistor across
an isolated barrier. These types of resistors are
typically used to sense currents in motor control
inverters, green energy generation systems, and
other industrial applications. The AMC1204
differential inputs easily connect to the shunt resistor
or other low-level signal sources. An internal
reference eliminates the need for external
components. When used with an appropriate external
digital filter, an effective number of bits (ENOB) of 14
is achieved at a data rate of 78kSPS.
A 5V analog supply (AVDD) is used by the modulator
while the isolated digital interface operates from a 3V,
3.3V, or 5V supply (DVDD). The AMC1204 is
available in an SO-16 (DW) package and is specified
from –40°C to +105°C.
APPLICATIONS
• Shunt Resistor Based Current Sensing in:
– Motor Control
– Green Energy
– Inverter Applications
– Uninterruptible Power Supplies
AVDD
DVDD
VINP
VINN
DS
Modulator
DATA
2.5V
Ref
CLKIN
AGND
DGND
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated