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ADC10664 Datenblatt(PDF) 8 Page - National Semiconductor (TI) |
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ADC10664 Datenblatt(HTML) 8 Page - National Semiconductor (TI) |
8 / 14 page Timing Diagrams Functional Description The ADC10662 and ADC10664 digitize an analog input sig- nal to 10 bits accuracy by performing two lower-resolution “flash” conversions. The first flash conversion provides the six most significant bits (MSBs) of data, and the second flash conversion provides the four least significant bits LSBs). Figure 3 is a simplified block diagram of the converter. Near the center of the diagram is a string of resistors. At the bot- tom of the string of resistors are 16 resistors, each of which has a value 1/1024 the resistance of the whole resistor string. These lower 16 resistors (the LSB Ladder) therefore have a voltage drop of 16/1024, or 1/64 of the total reference voltage (V REF+ −VREF−) across them. The remainder of the resistor string is made up of eight groups of eight resistors connected in series. These comprise the MSB Ladder. Each section of the MSB Ladder has 1⁄8 of the total reference volt- age across it, and each of the LSB resistors has 1/64 of the total reference voltage across it. Tap points across these re- sistors can be connected, in groups of sixteen, to the sixteen comparators at the right of the diagram. DS011192-7 FIGURE 1. Mode 1. The conversion time (t CONV) is set by the internal timer. DS011192-8 FIGURE 2. Mode 2 (RD Mode). The conversion time (t CRD) includes the sampling time and is determined by the internal timer. www.national.com 8 |
Ähnliche Teilenummer - ADC10664 |
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Ähnliche Beschreibung - ADC10664 |
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