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ISL54066 Folha de dados(PDF) 9 Page - Intersil Corporation |
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ISL54066 Folha de dados(HTML) 9 Page - Intersil Corporation |
9 / 14 page 9 FN6584.1 November 3, 2009 V+ and GND also power the internal logic and level shifters. The level shifters convert the input logic levels to V+ and GND signals levels to drive the analog switch gate terminals. A high frequency decoupling capacitor placed as close to the V+ and GND pin as possible is recommended for proper operation of the switch. A value of 0.1µF is highly recommended. Negative Signal Swing Capability The ISL54066 contains circuitry that allows the analog switch signal to swing below ground. The device has an analog signal range of 6.5V below V+ up to the V+ rail (see Figure 14) while maintaining low rON performance. For example, if V+ = 5V, then the analog input signal range is from -1.5V to +5V. If V+ = 2.7V then the range is from -3.8V to +2.7V. Logic-Level Thresholds This switch family is 1.8V CMOS compatible (0.45V VOLMAX and 1.35V VOHMIN) over a supply range of 1.8V to 3.3V (see Figure 16). At 3.3V the VIL level is 0.5V maximum. This is still below the 1.8V CMOS guaranteed low output maximum level of 0.45V, but noise margin is reduced. At 3.3V the VIH level is 1.4V minimum. While this is above the 1.8V CMOS guaranteed high output minimum of 1.35V under most operating conditions the switch will recognize this as a valid logic high. 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. The ISL54066 has been designed to minimize the supply current whenever the digital input voltage is not driven to the supply rails (0V to V+). For example, driving the device with 2.85V logic high while operating with a 4.2V supply, the device draws only 1µA of current. High-Frequency Performance In 50 Ω systems, the ISL54066 has a -3dB bandwidth of 30MHz (see Figure 19). 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 feed-through, while Crosstalk indicates the amount of feedthrough from one switch to another. Figure 20 details the high Off-Isolation and Crosstalk rejection provided by this part. At 1MHz, Off-Isolation is approximately 70dB in 50 Ω systems, decreasing approximately 40dB per decade as frequency increases. Crosstalk is approximately -80dB at 1MHz in 50 Ω systems. Leakage Considerations Reverse ESD protection diodes are internally connected between each analog-signal pin, V+ and GND. One of these diodes conducts if any analog signal exceeds the recommended analog signal range. Virtually all the analog switch leakage current comes from the ESD diodes and reversed biased junctions in the switch cell. Although the ESD diodes on a given signal pin are identical and therefore fairly well balanced, they are reverse biased differently. Each is biased to either the +Ring or -Ring and the analog input signal. This means their leakages will vary as the signal varies. The difference in the two diode leakages to the +Ring or -Ring and the reverse biased junctions at the internal switch cell constitutes the analog-signal-path leakage current. ISL54066 |
Nº de peça semelhante - ISL54066 |
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Descrição semelhante - ISL54066 |
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