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ISL54208IRZ-T Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL54208IRZ-T Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 15 page 9 FN6410.0 December 18, 2006 audio/video playback are intended to be mutually exclusive operations. NC1 and NC2 Audio/Video Switches The two NC (normally closed) audio/video switches (NC1, NC2) are 3 Ω switches that can pass signals that swing below ground by as much as 1.5V. They were designed to pass ground reference audio signals and dc restored composite base-band signals (CVBS) including negative synchronizing pulse with minimal insertion loss and very low distortion and degradation. The -3dB bandwidth into 75 Ω is 338MHz (Figure 17). Crosstalk between NC1 and NC2 @ 4MHz is -78dB (Figure 16) which allows composite video to be routed through one switch and mono-audio through the other switch with little interference. The recommended maximum signal range is from -1.5V to 1.5V. You can apply positive signals greater than 1.5V but the rON resistance of the switch increases rapidly above 1.5V. The signal should not be allowed to exceed the VDD rail or swing more negative than -1.5V. Over a signal range of ±1V (0.707Vrms) with VDD >2.7V, these switches have an extremely low rON resistance variation. They can pass a ground referenced audio signal with very low distortion (<0.06% THD+N) when delivering 15.6mW into a 32 Ω headphone speaker load. See Figures 10, 11, 12, and 13 THD+N performance curves. Figures 8 and 9 shows the vector scope plots of a standard NTSC color bar signal at both the input (Figure 8) and output (Figure 9) of the ISL54208. The plots show that except for a little attentuation, due to switch RON and test fixture cabling, there is virtually no degradation of the video waveform through the switch. Figure 18 shows the differential gain (DG) and differential phase (DP) plots at the output of the switch using an actual NTSC composite video signal and a VM700A Video Measurement Test Set. DG = 0.28% and DP = 0.04deg. The NC switches are uni-directional switches. The audio/video sources should be connected at the NC side of the switch (pins 7 and 8) and the speaker load and video receiver should be connected at the COM side of the switch (pins 3 and 4). The NC switches are active (turned ON) whenever the IN voltage is ≤ to 0.5V and the CTRL voltage to ≥1.4V. Note: Whenever the NC switches are ON the USB transceiver drivers need to be in the high impedance state or static high or low state. NO1 and NO2 USB Switches The two NO (normally open) USB switches (NO1, NO2) are 5 Ω bidirectional switches that were designed to pass high- speed USB differential signals in the range of ±0V to 400mV. These switches have low capacitance and high bandwidth to pass USB high-speed signals (480Mbps) with minimum edge and phase distortion to meet high-speed USB 2.0 high- speed signal quality specifications. See Figure 14 for High- speed Eye Pattern taken with switch in the signal path. The maximum signal range for the USB switches is from -1.5V to VDD. The signal voltage at NO1 and NO2 should not be allow to exceed the VDD voltage rail or go below ground by more than -1.5V. The NO switches are active (turned ON) whenever the IN voltage is to ≥1.4V. Note: Whenever the NO switches are ON the audio and video drivers need to be at ac or dc ground or floating to keep from interfering with the data transmission. FIGURE 8. VECTOR-SCOPE PLOT BEFORE SWITCH FIGURE 9. VECTOR-SCOPE PLOT AFTER SWITCH ISL54208 |
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