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ISL59481IRZ Scheda tecnica(PDF) 10 Page - Intersil Corporation |
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ISL59481IRZ Scheda tecnica(HTML) 10 Page - Intersil Corporation |
10 / 12 page 10 FN6208.4 May 18, 2007 The QFN Package Requires Additional PCB Layout Rules for the Thermal Pad The thermal pad is electrically connected to V- supply through the high resistance IC substrate. Its primary function is to provide heat sinking for the IC. However, because of the connection to the V1- and V2- supply pins through the substrate, the thermal pad must be tied to the V- supply to prevent unwanted current flow to the thermal pad. Do not tie this pin to GND as this could result in large back biased currents flowing between GND and the V- pins. Maximum AC performance is achieved if the thermal pad is attached to a dedicated decoupled layer in a multi-layered PC board. In cases where a dedicated layer is not possible, AC performance may be reduced at upper frequencies. The thermal pad requirements are proportional to power dissipation and ambient temperature. A dedicated layer eliminates the need for individual thermal pad area. When a dedicated layer is not possible, an isolated thermal pad on another layer should be used. Pad area requirements should be evaluated on a case-by-case basis. MUX Application Circuits Each of the two 4:1 triple MUX amplifiers have their own binary-coded, TTL compatible channel select logic inputs (S0-1, 2, and S1-1, 2). All three amplifiers are switched simultaneously from their respective inputs with S0-1 S1-1 controlling MUX-amp1, and S0-2, S1-2 controlling MUX- amp2. The HIZ control inputs (HIZ1, HIZ2) and device enable control inputs (EN1 and EN2) control MUX-amp1 and MUX- amp2 in a similar fashion. The individual control for each 4:1 triple MUX enables external connections to configure the device for different MUX applications. 8:1 RGB Video MUX For a triple input RGB 8:1 MUX (Figure 17), the RGB amplifier outputs of MUX-amp1 are parallel-connected to the RGB amplifier outputs of MUX-amp2 to produce the single RGB video output. Input channels CH0 through CH3 are assigned to MUX-amp1, and channels CH4 through CH7 are assigned to MUX-amp2. Channels CH0 through CH3 are selected by setting HIZ1 low, HIZ2 high (enables MUX-amp1 and three-states MUX-amp2), and the appropriate channel select logic to S0-1, S1-1. Reversing the logic inputs of HIZ1, HIZ2 switches from MUX-amp1 to MUX-amp2 enables the selection of channels CH4 through CH7. The channel select inputs are parallel connected (S0-1 to S0-2) and (S1-1 to S1-2) to form two logic controls S0, S1. A single S2 control is split into complimentary logic inputs for HIZ1 and HIZ2 to produce a chip select function for the MSB. The logic control truth table is shown in Figure 17. FIGURE 17. APPLICATION CIRCUIT FOR 8:1 RGB VIDEO MUX S2 S1 S0 OUTA, B, C 0 0 0 CH0A, B, C 0 0 1 CH1A, B, C 0 1 0 CH2A, B, C 0 1 1 CH3A, B, C 1 0 0 CH4A, B, C 1 0 1 CH5A,B,C 1 1 0 CH6A, B, C 1 1 1 CH7A, B, C +1 +1 ISL59481 1/3 MUX-AMP1 1/3 MUX-AMP2 OUTA OUTA1 IN0A1 OUTA2 IN1A2 IN1A1 IN2A1 IN3A1 IN0A2 IN2A2 IN3A2 S0-1 S1-1 HIZ1 S0-2 S1-2 HIZ2 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 S0 S1 S2 CH0A THROUGH CH7A CHANNEL SELECT CHANNELS B AND C NOT SHOWN LOGIC INPUTS CHANNEL SELECT TRUTH TABLE 8:1 VIDEO MUX CONTROL LOGIC CONTROL LOGIC |
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