AMC1311x-Q1 Automotive, High-Impedance, 2-V Input, Reinforced Isolated Amplifiers

1 Features

AEC-Q100 qualified for automotive applications:
- Temperature grade 1: –40°C to +125°C, T_A
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
Low DC errors:
- AMC1311-Q1:
  - Offset error: ±9.9 mV (maximum)
  - Offset drift: ±20 µV/°C (typical)
  - Gain error: ±1% (maximum)
  - Gain drift: ±30 ppm/°C (typical)
- 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-V_PK reinforced isolation per DIN EN IEC 60747-17 (VDE 0884-17)
- 5000-V_RMS isolation for 1 minute per UL1577

2 Applications

Isolated voltage sensing in:

3 Description

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 kV_RMS according to DIN EN IEC 60747-17 (VDE 0884-17) and UL1577 and supports a working voltage of up to 1500 V_RMS.

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.

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.

The AMC1311-Q1 is offered with two performance grade options: AMC1311-Q1 and AMC1311B-Q1.

Device Information⁽¹⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
AMC1311-Q1	SOIC (8)	5.85 mm × 7.50 mm
AMC1311B-Q1	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

4 Revision History

Changes from Revision B (May 2020) to Revision C (June 2022)

Changed Features sectionGo
Changed isolation standard from DIN VDE V 0884-11 (VDE V 0884-11) to DIN EN IEC 60747-17 (VDE 0884-17) and updated the Insulation Specifications and Safety-Related Certifications tables accordinglyGo
Changed Description sectionGo
Changed pin names: VIN to IN, VOUTP to OUTP, and VOUTN to OUTNGo
Merged V_OS specs for 4.5V ≤ VDD1 ≤ 5.5 V and 3.0 V ≤ VDD1 ≤ 5.5 V ranges (AMC1311B-Q1 only)Go
Changed VDD1 DC PSRR from –65 dB (typical) to –80 dB (typical)Go
Changed CMTI from 75 kV/µs (minimum), 140 kV/µs (typical) to 100 kV/µs (minimum), 150kV/µs (typical) (AMC1311B-Q1 only)Go
Changed VDD1_UV (VDD1 falling) from 1.75 V / 2.53 V / 2.7 V to 2.4 V / 2.6 V / 2.8 V (minimum / typical / maximum)Go
Changed Rise, Fall, and Delay Time Definition timing diagramGo
Changed Reinforced Isolation Capacitor Lifetime Projection figure Go
Deleted histogram plots from Typical Characteristics sectionGo
Changed Overview sectionGo
Changed functional block diagramGo
Changed the Analog Input sectionGo
Changed Isolation Channel Signal Transmission sectionGo
Deleted Fail-Safe Output section, added Analog Output sectionGo
Changed Application Information section for clarityGo
Changed Typical Application section and subsectionsGo
Changed Design Requirements tableGo
Changed Detailed Design Procedure sectionGo
Added Input Filter Design sectionGo
Added Differential to Single-Ended Output Conversion sectionGo
Changed Step Response of the AMC1311B-Q1 figureGo
Changed Application Curve sectionGo
Changed What To Do and What Not To Do sectionGo
Changed Power Supply Recommendations sectionGo
Changed Layout sectionGo
Changed Layout Guidelines sectionGo
Changed recommended layout drawingGo

Changes from Revision A (June 2018) to Revision B (May 2020)

Changed automotive-specific Features bullets Go
Added Functional Safety-Capable bullets to Features list. Go
Changed AMC1311B-Q1 offset drift from ±15 µV/°C (max) to 10 µV/°C (max) in Features sectionGo
Changed AMC1311B-Q1 gain error from ±0.3% (max) to ±0.2% (max) and changed AMC1311B-Q1 gain drift from ±45 ppm/°C (max) to ±40 ppm/°C (max) in Features sectionGo
Changed AMC1311B-Q1 values for TCV_OS, E_G, and TCE_G in Device Comparison Table Go
Added ESD classification levels to ESD Ratings tableGo
Changed CLR and CPG values from 9 mm to 8.5 mmGo
Changed Insulation Specifications table per ISO standardGo
Changed Safety-Related Certification table per ISO standardGo
Changed Safety Limiting Values description as per ISO standardGo
Changed TCV_OS parameter minimum value from –15 μV/°C to –10 μV/°C and maximum value from 15 μV/°C to 10μV/°C for the AMC1311B-Q1 in the Electrical Characteristics tableGo
Changed E_G parameter minimum value from –0.3% to –0.2% and maximum value from 0.3% to 0.2% for the AMC1311B-Q1 in the Electrical Characteristics tableGo
Changed TCE_G parameter minimum value from –45 ppm/°C to –40 ppm/°C and maximum value from 45 ppm/°C to 40 ppm/°C for the AMC1311B-Q1 in the Electrical Characteristics tableGo
Changed Step Response of the AMC1311B-Q1 figureGo
Changed Step Response of the AMC1311-Q1 figureGo

5 Pin Configuration and Functions

Figure 5-1 DWV Package,8-Pin SOIC(Top View)

Table 5-1 Pin Functions

PIN		TYPE	DESCRIPTION
NO.	NAME	TYPE	DESCRIPTION
1	VDD1	High-side power	High-side power supply⁽¹⁾
2	IN	Analog input	Analog input
3	SHTDN	Digital input	Shutdown input, active high, with internal pullup resistor (typical value: 100 kΩ)
4	GND1	High-side ground	High-side analog ground
5	GND2	Low-side ground	Low-side analog ground
6	OUTN	Analog output	Inverting analog output
7	OUTP	Analog output	Noninverting analog output
8	VDD2	Low-side power	Low-side power supply⁽¹⁾

(1) See the Section 9 section for power-supply decoupling recommendations.

6 Specifications

6.1 Absolute Maximum Ratings

see⁽¹⁾

		MIN	MAX	UNIT
Power-supply voltage	High-side VDD1 to GND1	–0.3	6.5	V
Power-supply voltage	Low-side VDD2 to GND2	–0.3	6.5	V
Input voltage	IN	GND1 – 6	VDD1 + 0.5	V
Input voltage	SHTDN	GND1 – 0.5	VDD1 + 0.5	V
Output voltage	OUTP, OUTN	GND2 – 0.5	VDD2 + 0.5	V
Input current	Continuous, any pin except power-supply pins	–10	10	mA
Temperature	Junction, T_J		150	°C
Temperature	Storage, T_stg	–65	150	°C

(1) Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.