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LTC1594 Datasheet(PDF) 15 Page - Linear Technology |
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LTC1594 Datasheet(HTML) 15 Page - Linear Technology |
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15 / 24 page  15 LTC1594/LTC1598 15948fb APPLICATIONS INFORMATION BOARD LAYOUT CONSIDERATIONS Grounding and Bypassing The LTC1594/LTC1598 are easy to use if some care is taken. They should be used with an analog ground plane and single point grounding techniques. The GND pin should be tied directly to the ground plane. The VCC pin should be bypassed to the ground plane with a 10 μFtantalumcapacitorwithleadsasshortaspossible. If the power supply is clean, the LTC1594/LTC1598 can also operate with smaller 1 μF or less surface mount or ceramic bypass capacitors. All analog inputs should be referenced directly to the single point ground. Digital inputs and outputs should be shielded from and/or routed away from the reference and analog circuitry. SAMPLE-AND-HOLD Both the LTC1594/LTC1598 provide a built-in sample- and-hold (S&H) function to acquire signals through the selected channel, assuming the ADCIN and MUXOUT pins are tied together. The S & H of these parts acquire input signals through the selected channel relative to COM input during the tSMPL time (see Figure 7). Single-Ended Inputs The sample-and-hold of the LTC1594/LTC1598 allows conversion of rapidly varying signals. The input voltage is sampled during the tSMPL time as shown in Figure 7. The sampling interval begins after tON time once the CS is pulled low and continues until the second falling CLK edge after the CS is low (see Figure 7). On this falling CLK Figure 7. LTC1594/LTC1598 ADCIN and COM Input Settling Windows CLK DIN DOUT MUXOUT = ADCIN CH0 TO CH7 SAMPLE HOLD “ANALOG” INPUT MUST SETTLE DURING THIS TIME tSMPL tON tCONV CSADC = CSMUX = CS D2 D1 EN D0 DON‘T CARE 1ST BIT TEST “COM” INPUT MUST SETTLE DURING THIS TIME B11 COM 1594/98 F07 |
Similar Part No. - LTC1594_1 |
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Similar Description - LTC1594_1 |
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