AMC1204_15 Datasheet, PDF (1/37 Pages) Texas Instruments – AMC1204 20-MHz, Second-Order, Isolated Delta-Sigma Modulator

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AMC1204, AMC1204B
SBAS512E – APRIL 2011 – REVISED SEPTEMBER 2015
AMC1204 20-MHz, Second-Order, Isolated Delta-Sigma Modulator
for Current-Shunt Measurement
1 Features
•1 ±250-mV Input Voltage Range Optimized for
Shunt Resistors
• Certified Digital Isolation:
– CSA, VDE V 0884-10, and UL1577 Approved
– Isolation Voltage: 4250 V_PEAK (AMC1204B)
– Working Voltage: 1200 V_PEAK
– Transient Immunity: 15 kV/µs
• Long Isolation Barrier Lifetime
(see Application Report SLLA197)
• High Electromagnetic Field Immunity
(see Application Note SLLA181A)
• Outstanding AC Performance:
– SNR: 84 dB (Minimum)
– THD: –80 dB (Maximum)
• Excellent DC Precision:
– INL: ±8LSB (Maximum)
– Gain Error: ±2% (Maximum)
• External Clock Input for Easier Synchronization
• Fully Specified Over the Extended Industrial
Temperature Range
2 Applications
• Shunt Resistor Based Current Sensing in:
– Motor Control
– Green Energy
– Inverter Applications
– Uninterruptible Power Supplies
3 Description
The AMC1204 and AMC1204B are 1-bit digital
output, isolated delta-sigma (ΔΣ) modulators that can
be clocked at up to 20 MHz. 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 4000 V_PEAK
(AMC1204) and 4250 V_PEAK (AMC1204B) according
to UL1577, VDE V 0884-10, 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 78 kSPS.
A 5-V analog supply (AVDD) is used by the
modulator while the isolated digital interface operates
from a 3-V, 3.3-V, or 5-V supply (DVDD). The
AMC1204 and AMC1204B are available in SOIC-16
(DW) and SOIC-8 (DWV) packages and are specified
from –40°C to 105°C.
PART NUMBER
AMC1204
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
SOIC (16)
10.30 mm × 7.50 mm
SOIC (8)
5.85 mm × 7.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
AVDD
DVDD
VINP
VINN
DS
Modulator
DATA
2.5V
Ref
AGND
CLKIN
DGND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.