AMC1204_12 Datasheet, PDF (1/32 Pages) Texas Instruments – 20MHz, Second-Order, Isolated Delta-Sigma Modulator for Current-Shunt Measurement

AMC1204
AMC1204B
www.ti.com
SBAS512C – APRIL 2011 – REVISED AUGUST 2012
20MHz, Second-Order, Isolated Delta-Sigma Modulator
for Current-Shunt Measurement
Check for Samples: AMC1204, AMC1204B
FEATURES
1
•2 ±250mV Input Voltage Range Optimized for
Shunt Resistors
• Certified Digital Isolation:
– CSA, IEC60747-5-2, and UL1577 Approved
– Isolation Voltage: 4250V_PEAK (AMC1204B)
– 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
APPLICATIONS
• Shunt Resistor Based Current Sensing in:
– Motor Control
– Green Energy
– Inverter Applications
– Uninterruptible Power Supplies
DESCRIPTION
The AMC1204 and AMC1204B are 1-bit digital
output, isolated delta-sigma (ΔΣ) modulators 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
(AMC1204) and 4250V_PEAK (AMC1204B) according to
UL1577, IEC60747-5-2, and CSA standards or
specifications.
The AMC1204 and AMC1204B provide 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 and
AMC1204B 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 and
AMC1204B are available in SO-16 (DW) packages
and are specified from –40°C to +105°C.
AVDD
DVDD
VINP
VINN
DS
Modulator
DATA
2.5V
Ref
CLKIN
AGND
DGND
1
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2
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.
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