AMC1202 Precision, ±50-mV Input, Basic Isolated Amplifier

1 Features

±50-mV input voltage range optimized for current measurements using shunt resistors
Fixed gain: 41
Low DC errors:
- Offset error: ±50 μV (max)
- Offset drift: ±0.8 μV/°C (max)
- Gain error: ±0.2% (max)
- Gain drift: ±35 ppm/°C (max)
- Nonlinearity: 0.03% (max)
3.3-V or 5-V operation on high-side and low-side
Fail-safe output
High CMTI : 100 kV/µs (min)
Low EMI, meets CISPR-11 and CISPR-25 standards
Safety-related certifications:
- 4250-V_PK basic isolation per DIN VDE V 0884-11: 2017-01
- 3000-V_RMS isolation for 1 minute per UL1577

2 Applications

Shunt-resistor-based current sensing in:

3 Description

The AMC1202 is a precision, isolated amplifier with an output separated from the input circuitry by an isolation barrier that is highly resistant to magnetic interference. This barrier is certified to provide basic galvanic isolation of up to 3 kV_RMS according to VDE V 0884-11 and UL1577, and supports a working voltage of up to 1 kV_RMS.

The isolation barrier separates parts of the system that operate on different common-mode voltage levels and protects the low-voltage side from hazardous voltages and damage.

The input of the AMC1202 is optimized for direct connection to a low-impedance shunt resistor or other low-impedance voltage source with low signal levels. The excellent DC accuracy and low temperature drift supports accurate current control in PFC stages, DC/DC converters, traction inverters, and OBCs over the full automotive temperature range from –40°C to +125°C.

The integrated missing shunt and missing high-side supply detection features simplify system-level design and diagnostics.

Device Information⁽¹⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
AMC1202	SOIC (8)	5.85 mm × 7.50 mm

(1) For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application

4 Revision History

DATE	REVISION	NOTES
May 2021	*	Initial Release

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	INP	Analog input	Noninverting analog input. Either INP or INN must have a DC current path to GND1 to define the common-mode input voltage.⁽²⁾
3	INN	Analog input	Inverting analog input. Either INP or INN must have a DC current path to GND1 to define the common-mode input voltage.⁽²⁾
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.

(2) See the Section 10 section for details.

6 Specifications

6.1 Absolute Maximum Ratings

over operating ambient temperature range (unless otherwise noted)⁽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
Analog input voltage	INP, INN	GND1 – 6	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

6.2 ESD Ratings

			VALUE	UNIT
V_(ESD)	Electrostatic discharge	Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 ⁽¹⁾	±2000	V
V_(ESD)	Electrostatic discharge	Charged device model (CDM), per JESD22-C101 ⁽²⁾	±1000	V

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.