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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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ISL54057IRUZ-T Folha de dados(PDF) 8 Page - Intersil Corporation |
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ISL54057IRUZ-T Folha de dados(HTML) 8 Page - Intersil Corporation |
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8 / 10 page  8 FN6379.0 September 29, 2006 Power-Supply Considerations The ISL54057 construction is typical of most CMOS analog switches, in that they have two supply pins: V+ and GND. V+ and GND drive the internal CMOS switches and set their analog voltage limits. Unlike switches with a 4V maximum supply voltage, the ISL54057 4.7V maximum supply voltage provides plenty of room for the 10% tolerance of 3.6V supplies, as well as room for overshoot and noise spikes. The minimum recommended supply voltage is 1.6V but the part will operate with a supply below 1.5V. It is important to note that the input signal range, switching times, and on-resistance degrade at lower supply voltages. Refer to the electrical specification tables and Typical Performance curves for details. V+ and GND power the internal logic (thus setting the digital switching point) and level shifters. The level shifters convert the logic levels to switched V+ and V- signals to drive the analog switch gate terminals. Logic-Level Thresholds This device is 1.8V CMOS compatible (0.5V and 1.4V) over a supply range of 2.7V to 3.6V. At 2.7V the VIL level is about 0.54V. This is still above the 1.8V CMOS guaranteed low output maximum level of 0.5V but noise margin is reduced. 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 even past 10MHz with a -3dB bandwidth of 70MHz (see Figure 12). 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 feed through from a switch’s input to its output. Off Isolation is the resistance to this feed through, while Crosstalk indicates the amount of feed through from one switch to another. Figure 11 details the high Off Isolation and Crosstalk rejection provided by this family. At 100kHz, Off Isolation is about 65dB in 50 Ω systems, decreasing approximately 20dB per decade as frequency increases. Higher load impedances decrease Off Isolation and Crosstalk rejection 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 8. ON RESISTANCE vs SUPPLY VOLTAGE vs SWITCH VOLTAGE FIGURE 9. ON RESISTANCE vs SWITCH VOLTAGE 01 2 3 4 VCOM (V) ICOM = 100mA 0.3 0.4 0.5 0.6 0.7 0.8 V+ = 3V V+ = 1.8V V+ = 3.6V V+ = 1.65V V+ = 2.7V VCOM (V) 00.511.522.5 3 V+ = 3V ICOM = 100mA 0.25 0.3 0.35 0.4 0.45 0.5 +25°C +85°C -40°C ISL54057 |
Nº de peça semelhante - ISL54057IRUZ-T |
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Descrição semelhante - ISL54057IRUZ-T |
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