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AD7564ARS-B Datasheet(PDF) 7 Page - Analog Devices |
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AD7564ARS-B Datasheet(HTML) 7 Page - Analog Devices |
7 / 16 page –7– REV. A 3 AD7564 PIN DESCRIPTIONS Pin Number Mnemonic Description 1 DGND Digital Ground. 2IOUT2CIOUT2 terminal for DAC C. This should normally connect to the signal ground of the system. 3VDD Positive power supply. This is +5 V ± 5%. 4IOUT1CIOUT1 terminal for DAC C. 5RFBC Feedback resistor for DAC C. 6VREFC DAC C reference input. 7IOUT2DIOUT2 terminal for DAC D. This should normally connect to the signal ground of the system. 8IOUT1DIOUT1 terminal for DAC D. 9RFBD Feedback resistor for DAC D. 10 VREFD DAC D reference input. 11 SDOUT This shift register output allows multiple devices to be connected in a daisy chain configuration. 12 CLR Asynchronous CLR input. When this input is taken low, all DAC latches are loaded with all 0s. 13 LDAC Asynchronous LDAC input. When this input is taken low, all DAC latches are simultaneously updated with the contents of the input latches. 14 FSIN Level-triggered control input (active low). This is the frame synchronization signal for the input data. When FSIN goes low, it enables the input shift register, and data is transferred on the falling edges of CLKIN. If the address bits are valid, the 12-bit DAC data is transferred to the appropriate input latch on the sixteenth falling edge after FSIN goes low. 15 SDIN Serial data input. The device accepts a 16-bit word. DB0 and DB1 are DAC select bits. DB2 and DB3 are device address bits. DB4 to DB15 contain the 12-bit data to be loaded to the selected DAC. 16 CLKIN Clock Input. Data is clocked into the input shift register on the falling edges of CLKIN. 17 A1 Device address pin. This input in association with A0 gives the device an address. If DB2 and DB3 of the serial input stream do not correspond to this address, the data which follows is ignored and not loaded to any input latch. However, it will appear at SDOUT irrespective of this. 18 A0 Device address pin. This input in association with A1 gives the device an address. 19 VREFA DAC A reference input. 20 RFBA Feedback resistor for DAC A. 21 IOUT1AIOUT1 terminal for DAC A. 22 IOUT2AIOUT2 terminal for DAC A. This should normally connect to the signal ground of the system. 23 VREFB DAC B reference input. 24 RFBB Feedback resistor for DAC B. 25 IOUT1BIOUT1 terminal for DAC B. 26 N/C No Connect pin. 27 AGND This pin connects to the back gates of the current steering switches. It should be connected to the signal ground of the system. 28 IOUT2BIOUT2 terminal for DAC B. This should normally connect to the signal ground of the system. |
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