The AMC23C12 is an isolated window comparator with a short response time. The open-drain output is separated from the input circuitry by an isolation barrier that is highly resistant to magnetic interference. This barrier is certified to provide reinforced galvanic isolation of up to 5kVRMS according to VDE 0884-17 and UL1577, and supports a working voltage of up to 1kVRMS.
The comparison window is centered around 0V, meaning that the comparator trips if the absolute value of the input voltage exceeds the trip threshold value. The trip threshold is adjustable from 20mV to 300mV through a single external resistor and, therefore, the comparison window ranges from ±20mV to ±300mV. When the voltage on the REF pin is greater than 550mV, the negative comparator is disabled and only the positive comparator is functional. The reference voltage in this mode ranges as high as 2.7V. This mode is particularly useful for monitoring voltage supplies.
The open-drain output on the device supports transparent mode (LATCH input tied to GND2) where the output follows the input state, or latch mode, where the output is cleared on the falling edge of the latch input signal.
The AMC23C12 is available in an 8-pin, wide-body SOIC package and is specified over the full automotive temperature range of –40°C to +125°C.
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | VDD1 | High-side power | High-side power supply(1) |
2 | IN | Analog input | Analog input pin to the window comparator |
3 | REF | Analog input | Reference pin that defines the trip threshold. The voltage on this pin also affects the hysteresis of comparator Cmp0, as explained in the Reference Input section. This pin is internally connected to a 100μA current source. Connect a resistor from REF to GND1 to define the trip threshold, and a capacitor from REF to GND1 to filter the reference voltage. For best transient noise immunity, place the capacitor as closely to the pin as possible. This pin can also be driven by an external voltage source. |
4 | GND1 | High-side ground | High-side ground |
5 | GND2 | Low-side ground | Low-side ground |
6 | OUT | Digital output | Open-drain output of the window comparator. Connect to an external pullup resistor. |
7 | LATCH | Digital input | Digital input to select latch mode (high) or transparent mode (low) of the open-drain output. Do not leave the input pin unconnected (floating). Connect to GND2 when not used. |
8 | VDD2 | Low-side power | Low-side power supply(1) |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Power-supply voltage | VDD1 to GND1 | –0.3 | 30 | V |
VDD2 to GND2 | –0.3 | 6.5 | ||
Analog input voltage | REF to GND1 | –0.5 | 6.5 | V |
IN to GND1 | –6 | 5.5 | ||
Digital input voltage | LATCH to GND2 | –0.5 | VDD2 + 0.5 | V |
Digital output voltage | OUT to GND2 | –0.5 | VDD2 + 0.5 | V |
Input current | Continuous, any pin except power-supply pins | –10 | 10 | mA |
Temperature | Junction, TJ | 150 | °C | |
Storage, Tstg | –65 | 150 |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
Charged-device model (CDM), per ANSI/ESDA/JEDEC JS-002(2) | ±1000 |