TL490CN

The TL490C consists of ten comparators and a reference voltage network to detect the level of a signal at the analog input. Output Q1 is switched to a low logic level at a typical input voltage of 200 millivolts with Threshold-Adjust open and the cascade input grounded. After each 200-millivolt increment, the next output is switched to a low logic level. Ali outputs are at low logic levels at a typical input voltage of 2000 millivolts. The threshold-adjust terminal allows the user to decrease the input voltage
I 11 hi 1.1 I a ADJUST  NC FL G1 111 Q4 10 1 Q3
NC—No internal connection
steps from 200-millivolt to 100-millivolt increments by
connecting an external resistor from Threshold Input to ground.
This level detector is directly cascadable requiring only two external resistors. The maximum number of devices that can be cascaded is determined by the threshold level and the maximum input voltage. See Figure 4 in Typical Applica-tion Data. If the cascade feature is not utilized, the cascade input must be grounded for proper operation.
The TL490C is especially designed to detect and indicate analog signal levels and may be used in various industrial, consumer, or automotive applications such as low-precision meters, warning-signal indicators, A/D converters, feedback regulators, pulse shapers, delay elements, and for automatic range switching. The open-collector outputs are capable of sinking currents up to 40 milliamperes and may be operated at voltages up to 32 volts. The power outputs are suitable for driving a variety of display elements such as LED’s or filament tamps. The outputs may also drive digital integrated logic such as TTL, CMOS, or other high-level logic.
The TL490C is characterized for operation from 0°C to 70°C.