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ISL43111IBZ-T датащи(PDF) 8 Page - Intersil Corporation |
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ISL43111IBZ-T датащи(HTML) 8 Page - Intersil Corporation |
8 / 12 page 8 FN6028.3 April 12, 2005 This family of switches cannot be operated with bipolar supplies, because the input switching point becomes negative in this configuration. For a ±5V single SPST switch, see the ISL43112/13 data sheet. Logic-Level Thresholds This switch family is TTL compatible (0.8V and 2.4V) over a supply range of 3V to 11V, and the full temperature range (see Figure 10). At 12V the low temperature VIH level is about 2.5V. This is still below the TTL guaranteed high output minimum level of 2.8V, but noise margin is reduced. For best results with a 12V supply, use a logic family the provides a VOH greater than 3V. The digital input stages draw supply current whenever the digital input voltage is not at one of the supply rails. Driving the digital input signals from GND to V+ with a fast transition time minimizes power dissipation. High-Frequency Performance In 50 Ω systems, signal response is reasonably flat to 20MHz, with a -3dB bandwidth exceeding 200MHz (see Figure 15). Figure 15 also illustrates that the frequency response is very consistent over a wide V+ range, and for varying analog signal levels. An OFF switch acts like a capacitor and passes higher frequencies with less attenuation, resulting in signal feedthrough from a switch’s input to its output. Off Isolation is the resistance to this feedthrough. Figure 16 details the high Off Isolation provided by this family. At 10MHz, off isolation is about 50dB in 50 Ω systems, decreasing approximately 20dB per decade as frequency increases. Higher load impedances decrease Off Isolation due to the voltage divider action of the switch OFF impedance and the load impedance. Leakage Considerations Reverse ESD protection diodes are internally connected between each analog-signal pin and both V+ and GND. One of these diodes conducts if any analog signal exceeds V+ or GND. Virtually all the analog leakage current comes from the ESD diodes to V+ or GND. Although the ESD diodes on a given signal pin are identical and therefore fairly well balanced, they are reverse biased differently. Each is biased by either V+ or GND and the analog signal. This means their leakages will vary as the signal varies. The difference in the two diode leakages to the V+ and GND pins constitutes the analog- signal-path leakage current. All analog leakage current flows between each pin and one of the supply terminals, not to the other switch terminal. This is why both sides of a given switch can show leakage currents of the same or opposite polarity. There is no connection between the analog-signal paths and V+ or GND. Typical Performance Curves TA = 25°C, Unless Otherwise Specified FIGURE 7. ON RESISTANCE vs SUPPLY VOLTAGE FIGURE 8. ON RESISTANCE vs SWITCH VOLTAGE V+ (V) 34 5 6 7 8 9 10 11 12 13 ICOM = 1mA VCOM = (V+) - 1V 0 5 10 15 20 25 25°C -40°C 85°C VCOM (V) 0 4 6 8 10 12 2 V+ = 3.3V ICOM = 1mA 25°C 85°C -40°C 5 3 5 7 9 V+ = 12V 25°C 85°C -40°C 7 9 11 13 15 V+ = 5V 25°C -40°C 85°C 8 12 16 20 ISL43110, ISL43111 |
Аналогичный номер детали - ISL43111IBZ-T |
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Аналогичное описание - ISL43111IBZ-T |
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