feature

Comparator with 0.6v on-chip reference output stage; open-drain active low ( ADCMP350 ); open-drain active high (ADCMP354); push-pull active high (ADCMP356); high voltage on VIN and open-drain output pins (up to 22 volts) tolerance; low power consumption: 10 µA; 10 mA input bias current; 15 mV hysteresis; 5 µs propagation delay; specified temperature range from -40°C to + 125 °C, 4-lead SC70 package.

application

Voltage detectors; microprocessor systems; computers; battery monitors; smart instruments; portable devices.

General Instructions

The ADCMP350/ADCMP354/ADCMP356 are comparators and reference circuits for general purpose applications. The high-voltage input and output structure allows up to 22V to be applied at the input of all devices and the output of open-drain devices. High performance over the -40°C to +125°C temperature range makes it suitable for use in automotive and other thermally harsh applications, while the low power consumption and space-saving SC70 package make it ideal for battery-powered portable devices .

Absolute Maximum Ratings

TA = 25°C unless otherwise noted.

Stresses greater than or equal to the Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; it does not imply functional operation of the product under the conditions described in the operating section of this specification or any other conditions above. Prolonged operation beyond maximum operating conditions may affect product reliability.

Pin Configuration and Function Description

ADCMP350/ADCMP354/ADCMP356 Typical Performance Characteristics

application information

add lag

To prevent noise or slow-moving signals passing the switching threshold from causing oscillations at the output, positive feedback can be used to add hysteresis to the non-rotating parts (ADCMP354 and ADCMP356).

For the non-vertical configuration shown in Figure 20, two resistors are used to create different switching thresholds depending on whether the amplitude of the input signal is increasing or decreasing. When the input voltage increases, the threshold is higher than VREF, and when the input voltage decreases, the threshold is lower than VREF.

The upper threshold of the input is given by:

where V=0.6v, assuming R>>R2, the lower input threshold level of R is given by:

Hysteresis is the difference between these voltage levels, given by:

Voltage detector

The ADCMP350/ADCMP354/ADCMP356 can be used to monitor voltages such as battery monitoring or threshold detectors. By using a resistive voltage divider on the input to select the appropriate trip voltage, the comparator can be configured to give a logic output when the input passes this threshold.

Figure 21 shows a typical configuration of the ADCMP354 to monitor the power supply to indicate that the voltage is above a certain level.

Dimensions