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ISL59444IB-T7 датащи(PDF) 9 Page - Intersil Corporation |
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ISL59444IB-T7 датащи(HTML) 9 Page - Intersil Corporation |
9 / 11 page 9 FN7451.1 September 21, 2005 Application Information General The ISL59444 is a 4:1 mux that is ideal as a matrix element in high performance switchers and routers. The ISL59444 is optimized to drive a 2pF in parallel with a 500 Ω load. The capacitance can be split between the PCB capacitance an and external load capacitance. Their low input capacitance and high input resistance provide excellent 50 Ω or 75Ω terminations. Capacitance at the Output The output amplifier is optimized for capacitance to ground (CL) directly on the output pin. Increased capacitance causes higher peaking with an increase in bandwidth. The optimum range for most applications is ~1.0pF to ~6pF. The optimum value can be achieved through a combination of PC board trace capacitance (CT) and an external capacitor (COUT). A good method to maintain control over the output pin capacitance is to minimize the trace length (CT) to the next component, and include a discrete surface mount capacitor (COUT) directly at the output pin. For large signal applications where overshoot is important the circuit in Figure 22B should be used. The series resistor (RS) and capacitor (CL) form a low pass network that limits system bandwidth and reduces overshoot. The component values shown result in a typical pulse response shown in Figure 18. Ground Connections For the best isolation and crosstalk rejection, the GND pin and NIC pins must connect to the GND plane. The NIC pins are placed on both sides of the input pins. These pins are not internally connected to the die. It is recommended this pin be tied to ground to minimize crosstalk. Control Signals S0, S1, HIZ - These pins are, TTL/CMOS compatible control inputs. The S0, S1 pins select which one of the inputs connect to the output. The HIZ pin is used to three-state the output amplifiers. For control signal rise and fall times less than 10ns the use of termination resistors close to the part will minimize transients coupled to the output. HIZ State An internal pull-down resistor connected to the HIZ pin ensures the device will be active with no connection to the HIZ pin. The HIZ state is established within approximately 30ns by placing a logic high (>2V) on the HIZ pin. If the HIZ state is selected, the output is a high impedance 1.4M Ω. Use this state to control the logic when more than one mux shares a common output. In the HIZ state the output is three-stated, and maintains its high Z even in the presence of high slew rates. The supply current during this state is basically the same as the active state. Application Circuits FIGURE 22A. SMALL SIGNAL 200mVP-P APPLICATION CIRCUIT FIGURE 22B. LARGE SIGNAL 1VP-P APPLICATION CIRCUIT VIN 50 Ω - + *CL: TOTAL LOAD CAPACITANCE COUT: OUTPUT CAPACITANCE CT: TRACE CAPACITANCE COUT RL = 500Ω VOUT 0pF *CL = CT + COUT CT 1.6pF VIN 50 Ω RL = 500Ω - + VOUT 1.6pF 22pF 25 Ω CT COUT CL = CT + COUT RS ISL59444 |
Аналогичный номер детали - ISL59444IB-T7 |
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Аналогичное описание - ISL59444IB-T7 |
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