Overview
The AMC1350QDWVRQ1, produced by Texas Instruments, is a precision, isolated amplifier designed for high-accuracy voltage sensing applications. This device is fully differential and features a high input impedance, making it suitable for use in high-voltage environments where galvanic isolation is necessary. The AMC1350-Q1 is AEC-Q100 qualified for automotive applications, ensuring reliability over a wide temperature range of –40°C to +125°C. It utilizes a delta-sigma (ΔΣ) modulator and a fourth-order analog filter to provide a precise and isolated analog output.
Key Specifications
| Parameter | Min | Typ | 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 range (INP - INN) | -5 | 5 | V | |
| High-side supply current (VDD1 = 3.0 V to 3.6 V) | 6.0 | 8.1 | mA | |
| Low-side supply current (VDD2 = 3.0 V to 3.6 V) | 5.3 | 7.2 | mA | |
| Gain | 0.4 | V/V | ||
| Offset error | ±1.5 | mV | ||
| Gain error | ±0.2% | |||
| Common-mode transient immunity (CMTI) | 100 | kV/µs | ||
| Isolation voltage | 7070 V PK | |||
| Operating temperature range | -40 | 125 | °C |
Key Features
- AEC-Q100 Qualified: Suitable for automotive applications with a temperature range of –40°C to +125°C.
- Precision Voltage Sensing: Linear input voltage range of ±5 V and high input impedance of 1.25 MΩ (typ).
- Fixed Gain: Nominal gain of 0.4 V/V.
- Low DC Errors: Offset error ±1.5 mV (max), gain error ±0.2% (max), and nonlinearity ±0.02% (max).
- High CMTI: Common-mode transient immunity of 100 kV/µs (min).
- Fail-Safe Output: Simplifies diagnostics on a system level with a fail-safe condition indicated by a negative differential output voltage.
- Reinforced Isolation: Certified to provide reinforced galvanic isolation of up to 5 kV RMS according to VDE V 0884-11 and UL1577.
- Functional Safety-Capable: Designed to support functional safety requirements.
Applications
The AMC1350-Q1 is widely used in various high-voltage applications requiring isolated voltage sensing, such as:
- Automotive Systems: Onboard chargers (OBC), DC/DC converters, and other automotive applications where high accuracy and isolation are necessary.
- AC Line Voltage Measurements: Grid-connected equipment, line-to-neutral or line-to-line voltage measurements.
- Industrial Control Systems: Frequency inverters, AC motor, and servo-drive applications.
Q & A
- What is the operating temperature range of the AMC1350-Q1?
The AMC1350-Q1 operates over a temperature range of –40°C to +125°C.
- What is the input voltage range of the AMC1350-Q1?
The input voltage range is ±5 V.
- What is the nominal gain of the AMC1350-Q1?
The nominal gain is 0.4 V/V.
- What is the common-mode transient immunity (CMTI) of the AMC1350-Q1?
The CMTI is 100 kV/µs (min).
- Does the AMC1350-Q1 have fail-safe output features?
Yes, it includes a fail-safe output feature that simplifies diagnostics on a system level.
- What are the safety-related certifications of the AMC1350-Q1?
The device is certified for reinforced galvanic isolation of up to 5 kV RMS according to VDE V 0884-11 and UL1577.
- How is the isolation barrier in the AMC1350-Q1 implemented?
The isolation barrier is SiO2-based and provides high magnetic field immunity.
- What are the typical applications of the AMC1350-Q1?
Typical applications include onboard chargers, AC line voltage measurements, DC/DC converters, frequency inverters, and AC motor and servo-drive systems.
- What is the recommended power supply configuration for the AMC1350-Q1?
The high-side power supply (VDD1) and low-side power supply (VDD2) should be decoupled with low-ESR capacitors as specified in the datasheet.
- Is the AMC1350-Q1 suitable for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications.
