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AD420ARZ-32-REEL Fiches technique(PDF) 6 Page - Analog Devices |
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AD420ARZ-32-REEL Fiches technique(HTML) 6 Page - Analog Devices |
6 / 16 page AD420 Rev. H | Page 6 of 16 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS NC 1 VLL 2 FAULT DETECT 3 RANGE SELECT 2 4 NC 24 VCC 23 NC 22 CAP 2 21 RANGE SELECT 1 5 CAP 1 20 CLEAR 6 BOOST 19 LATCH 7 IOUT 18 CLOCK 8 VOUT 17 DATA IN 9 OFFSET TRIM 16 DATA OUT 10 REF IN 15 GND 11 REF OUT 14 NC 12 NC 13 NC = NO CONNECT AD420 TOP VIEW (Not to Scale) Figure 2. Pin Configuration Table 4. Pin Function Descriptions Pin No. Mnemonic Function 1, 12, 13, 24 NC No Connection. No internal connections inside device. 2 VLL Auxiliary buffered +4.5 V digital logic voltage. This pin is the internal supply voltage for the digital circuitry and can be used as a termination for pull-up resistors. An external +5 V power supply can be connected to VLL. It will override this buffered voltage, thus reducing the internal power dissipation. The VLL pin should be decoupled to GND with a 0.1 μF capacitor. See the Power Supplies and Decoupling section. 3 FAULT DETECT FAULT DETECT, connected to a pull-up resistor, is asserted low when the output current does not match the DAC’s programmed value, for example, in case the current loop is broken. 4 RANGE SELECT 2 Selects the converter’s output operating range. One output voltage range and three 5 RANGE SELECT 1 output current ranges are available. 6 CLEAR Valid VIH unconditionally forces the output to go to the minimum of its programmed range. After CLEAR is removed the DAC output will remain at this value. The data in the input register is unaffected. 7 LATCH In the 3-wire interface mode a rising edge parallel loads the serial input register data into the DAC. To use the asynchronous mode connect LATCH through a current limiting resistor to VCC. 8 CLOCK Data Clock Input. The clock period is equal to the input data bit rate in the 3-wire interface mode and is 16 times the bit rate in asynchronous mode. 9 DATA IN Serial Data Input. 10 DATA OUT Serial Data Output. In the 3-wire interface mode, this output can be used for daisy-chaining multiple AD420s. In the asynchronous mode a positive pulse will indicate a framing error after the stop-bit is received. 11 GND Ground (Common). 14 REF OUT +5 V Reference Output. 15 REF IN Reference Input. 16 OFFSET TRIM Offset Adjust. 17 VOUT Voltage Output. 18 IOUT Current Output. 19 BOOST Connect to an external transistor to reduce the power dissipated in the AD420 output transistor, if desired. 20 CAP 1 These pins are used for internal filtering. Connect capacitors between each of these 21 CAP 2 pins and VCC. Refer to the description of current output operation. 22 NC No Connection. Do not connect anything to this pin. 23 VCC Power Supply Input. The VCC pin should always be decoupled to GND with a 0.1 μF capacitor. See the Power Supplies and Decoupling section. |
Numéro de pièce similaire - AD420ARZ-32-REEL |
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Description similaire - AD420ARZ-32-REEL |
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