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AD790AQ Datasheet(PDF) 8 Page - Analog Devices |
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AD790AQ Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page AD790 REV. D –8– 2 3 1 4 6 7 5 8 TTL LEVEL OUTPUT 400 * 5V + GND STANDARD SCHOTTKY DIODE 1k A RESISTOR UP TO 10k MAYBE USED TO REDUCE THE SOURCE AND SINK CURRENT OF THE DRIVER. HOWEVER, THIS WILL SLIGHTLY LOWER THE MAXIMUM USABLE CLOCK RATE. * BIPOLAR SIGNAL INPUT 4.7V 0.3V 5V – Ω Ω Ω Figure 11. A Bipolar to CMOS TTL Line Receiver (N, Q Package Pinout) Bipolar to CMOS/TTL It is sometimes desirable to translate a bipolar signal (e.g., ±5 V) coming from a communications cable or another section of the system to CMOS/TTL logic levels; such an application is referred to as a line receiver. Previously, the interface to the bipolar signal required either a dual ( ±) power supply or a refer- ence voltage level about which the line receiver would switch. The AD790 may be used in a simple circuit to provide a unique capability: the ability to receive a bipolar signal while powered from a single 5 V supply. Other comparators cannot perform this task. Figure 11 shows a 1 k Ω resistor in series with the input signal which is then clamped by a Schottky diode, holding the input of the comparator at 0.4 V below ground. Although the comparator is specified for a common mode range down to –VS, (in this case ground) it is permissible to bring one of the inputs a few hundred mV below ground. The comparator switches around this level and produces a CMOS/TTL compatible swing. The circuit will operate to switching frequencies of 20 MHz. |
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