AMC1311-Q1
SBAS897C – MARCH 2018 – REVISED JUNE 2022
AMC1311x-Q1 Automotive, High-Impedance, 2-V Input, Reinforced Isolated Amplifiers
1 Features
3 Description
•
AEC-Q100 qualified for automotive applications:
– Temperature grade 1: –40°C to +125°C, TA
Functional Safety-Capable
– Documentation available to aid functional safety
system design
2-V, high-impedance input voltage range optimized
for isolated voltage measurement
Fixed gain: 1
The AMC1311-Q1 is a precision, isolated amplifier
with an output separated from the input circuitry by
a capacitive isolation barrier that is highly resistant
to magnetic interference. This barrier is certified to
provide reinforced galvanic isolation of up to 5 kVRMS
according to DIN EN IEC 60747-17 (VDE 0884-17)
and UL1577 and supports a working voltage of up to
•
•
1500 VRMS
.
•
•
Low DC errors:
– AMC1311-Q1:
The isolation barrier separates parts of the system
that operate on different common-mode voltage levels
and protects the low-voltage side from voltages that
can cause electrical damage or be harmful to an
operator.
•
•
•
•
Offset error: ±9.9 mV (maximum)
Offset drift: ±20 µV/°C (typical)
Gain error: ±1% (maximum)
Gain drift: ±30 ppm/°C (typical)
The high-impedance input of the AMC1311-Q1
is optimized for connection to high-impedance
resistive dividers or any other high-impedance voltage
signal source. The excellent DC accuracy and
low temperature drift support accurate, isolated
voltage sensing and control in closed-loop systems.
The integrated missing high-side supply voltage
detection feature simplifies system-level design and
diagnostics.
– AMC1311B-Q1:
•
•
•
•
Offset error: ±1.5 mV (maximum)
Offset drift: ±10 µV/°C (maximum)
Gain error: ±0.2% (maximum)
Gain drift: ±40 ppm/°C (maximum)
– Nonlinearity: 0.04% (maximum)
3.3-V operation on high-side (AMC1311B-Q1)
High CMTI: 100 kV/μs (AMC1311B-Q1)
Missing high-side supply indication
Safety-related certifications:
– 7000-VPK reinforced isolation per DIN EN IEC
60747-17 (VDE 0884-17)
– 5000-VRMS isolation for 1 minute per UL1577
•
•
•
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The AMC1311-Q1 is offered with two performance
grade options: AMC1311-Q1 and AMC1311B-Q1.
Device Information(1)
PART NUMBER
AMC1311-Q1
PACKAGE
BODY SIZE (NOM)
2 Applications
SOIC (8)
5.85 mm × 7.50 mm
AMC1311B-Q1
•
Isolated voltage sensing in:
– Traction inverters
– Onboard chargers
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
– DC/DC converters
VDC
High-side supply
(3.3 V or 5 V)
Low-side supply
(3.3 V or 5 V)
R1
R2
AMC1311B-Q1
VDD1
VDD2
OUTP
IN
SHTDN
GND1
0..2V
RSNS
VCMout
2 V
ADC
OUTN
GND2
Simplified Schematic
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.
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