Moteur de recherche de fiches techniques de composants électroniques |
|
ISL54207IRUZ-T Fiches technique(PDF) 9 Page - Intersil Corporation |
|
ISL54207IRUZ-T Fiches technique(HTML) 9 Page - Intersil Corporation |
9 / 14 page 9 FN6403.0 December 5, 2006 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 = 0.04°. These 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 VBUS voltage is ≤ to VDD + 0.2V or floating and the CTRL voltage ≥ to 1.4V. Note: Whenever the NC switches are ON the USB transceivers 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 are designed to pass high-speed USB differential signals in the range of ±0V to 400mV. The switches have low capacitance and high bandwidth to pass USB high-speed signals (480Mbps) with minimum edge and phase distortion to meet USB 2.0 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 allowed to exceed the VDD voltage rail or go below ground by more than -1.5V. The NO switches are active (turned ON) whenever the VBUS voltage is ≥ to VDD + 0.8V. VBUS is internally pulled low, so when VBUS is floating, the USB switches are OFF. 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. ISL54207 Operation The discussion that follows will discuss using the ISL54207 in the typical application shown in the block diagram on page 8. LOGIC CONTROL The state of the ISL54207 device is determined by the voltage at the VBUS pin (pin 2) and the CTRL pin (pin 10). Refer to truth-table on page 2 of the data sheet. The VBUS pin and CTRL pin are internally pulled low through 4MΩ resistors to ground and can be left floating. The CTRL control pin is only active when VBUS is logic “0”. Logic control voltage levels: VBUS = Logic “0” (Low) when VBUS ≤ VDD + 0.2V or Floating. VBUS = Logic “1” (High) when VBUS ≥ VDD + 0.8V CTRL = Logic “0” (Low) when ≤ 0.5V or floating. CTRL = Logic “1” (High) when ≥ 1.4V Audio/Video Mode If the VBUS pin = Logic “0” and CTRL pin = Logic “1,” the part will be in the Audio/Video mode. In Audio/Video mode the NC1 and NC2 3 Ω audio/video switches are ON and the NO1 and NO2 5 Ω USB switches are OFF (high impedance). In a typical application, VDD will be in the range of 2.7V to 3.6V and will be connected to the battery or LDO of the media player. When a audio/video jack is plugged into the common connector, nothing gets connected at the VBUS pin (it is floating) and as long as the CTRL = Logic “1,” the ISL54207 part remains in the audio/video mode and the media player audio and video drivers can drive the speaker and video display. FIGURE 8. VECTOR-SCOPE PLOT BEFORE SWITCH FIGURE 9. VECTOR-SCOPE PLOT AFTER SWITCH ISL54207 |
Numéro de pièce similaire - ISL54207IRUZ-T |
|
Description similaire - ISL54207IRUZ-T |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |