Datenblatt-Suchmaschine für elektronische Bauteile |
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ADC10664CIWM Datenblatt(PDF) 3 Page - National Semiconductor (TI) |
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ADC10664CIWM Datenblatt(HTML) 3 Page - National Semiconductor (TI) |
3 / 14 page Pin Descriptions DV CC, AV CC These are the digital and analog positive sup- ply voltage inputs. They should always be con- nected to the same voltage source, but are brought out separately to allow for separate bypass capacitors. Each supply pin should be bypassed with a 0.1 µF ceramic capacitor in parallel with a 10 µF tantalum capacitor to ground. INT This is the active low interrupt output. INT goes low at the end of each conversion, and returns to a high state following the rising edge of RD . S/H This is the Sample/Hold control input. When this pin is forced low (and CS is low), it causes the analog input signal to be sampled and ini- tiates a new conversion. RD This is the active low Read control input. When this RD and CS are low, any data present in the output registers will be placed on the data bus. CS This is the active low Chip Select control input. When low, this pin enables the RD and S /H pins. S0, S1 These pins select the analog input that will be connected to the A/D during the conversion. The input is selected based on the state of S0 and S1 when S /H makes its High-to-Low tran- sition (See the Timing Diagrams). The ADC10664 includes both S0 and S1. The ADC10662 includes just S0. V REF−, V REF+ These are the reference voltage inputs. They may be placed at any voltage between GND and V CC, but V REF+ must be greater than V REF−. An input voltage equal to VREF− pro- duces an output code of 0, and an input volt- age equal to (V REF+ − 1 LSB) produces an out- put code of 1023. V IN0,VIN1, V IN2,VIN3 These are the analog input pins. The ADC10662 has two inputs (V IN0 and VIN1) and the ADC10664 has four inputs (V IN0,VIN1, V IN2 and VIN3). The impedance of the source should be less than 500 Ω for best accuracy and conversion speed. For accurate conver- sions, no input pin (even one that is not se- lected) should be driven more than 50 mV above V CC or 50 mV below ground. GND, AGND, DGND These are the power supply ground pins. The ADC10662 and ADC10664 have separate analog and digital ground pins (AGND and DGND) for separate bypassing of the analog and digital supplies. The ground pins should be connected to a stable, noise-free system ground. Both pins should be returned to the same potential. DB0–DB9 These are the TRI-STATE output pins. SPEED ADJ By connecting a resistor between this pin and ground, the conversion time can be reduced. The specifications listed in the table of Electri- cal Characteristics apply for a speed adjust re- sistor (R SA) equal to 14.0 kΩ (Mode 1) or 8.26 k Ω (Mode 2). See the Typical Performance Curves and the table of Electrical Characteris- tics. www.national.com 3 |
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