AMC1204-Q1_15 Datasheet, PDF (1/33 Pages) Texas Instruments – 20 MHz, Second-Order, Isolated Delta-Sigma Modulator for Current-Shunt Measurement

AMC1204-Q1
www.ti.com
SLAS886B – JULY 2012 – REVISED JANUARY 2013
20 MHz, Second-Order, Isolated Delta-Sigma Modulator
for Current-Shunt Measurement
Check for Samples: AMC1204-Q1
FEATURES
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• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following
Results
– Device Temperature Grade 1: –40°C to
125°C Ambient Operating Temperature
Range
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C3B
• ±250-mV Input Voltage Range Optimized for
Shunt Resistors
• Certified Digital Isolation:
– CSA, IEC60747-5-2, and UL1577 Approved
– Isolation Voltage: 4250 V_PEAK
– 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 (min)
– THD: –80 dB (max)
• Excellent DC Precision:
– INL: ±8 LSB (max)
– Gain Error: ±2.5% (max)
• External Clock Input for Easier
Synchronization
• Fully Specified Over the Extended Automotive
Temperature Range
DESCRIPTION
The AMC1204-Q1 is a 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 4250 V_PEAK according to UL1577,
IEC60747-5-2, and CSA standards or specifications.
The AMC1204-Q1 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-Q1
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-Q1 is available in SO-16 (DW) packages
and are specified from –40°C to 125°C.
AVDD
DVDD
VINP
VINN
DS
Modulator
DATA
2.5V
Ref
CLKIN
APPLICATION
• Shunt Resistor Based Current Sensing in:
– Motor Control
– Green Energy
– Inverter Applications
– Uninterruptible Power Supplies
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
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