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AD5547BRU Datasheet(PDF) 7 Page - Analog Devices |
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AD5547BRU Datasheet(HTML) 7 Page - Analog Devices |
7 / 20 page AD5547/AD5557 Rev. 0 | Page 7 of 20 Pin No. Mnemonic Function 18 WR Write Control Digital Input In, Active Low. WR transfers shift register data to the DAC register on the rising edge. Signal level must be ≤ VDD + 0.3 V. 19 A0 Address Pin 0. Signal level must be ≤ VDD + 0.3 V. 20 A1 Address Pin 1. Signal level must be ≤ VDD + 0.3 V. 21 LDAC Digital Input Load DAC Control. Signal level must be ≤ VDD + 0.3 V. 22 MSB Power-On Reset State. MSB = 0 corresponds to zero-scale reset; MSB = 1 corresponds to midscale reset. The signal level must be ≤ VDD + 0.3 V. 23 RS Active low resets both input and DAC registers. Resets to zero-scale if MSB = 0, and to midscale if MSB = 1. Signal level must be ≤ VDD + 0.3 V. 29 VDD Positive Power Supply Input. The specified range of operation is 2.7 V to 5.5 V. Table 4. AD5557 Pin Function Descriptions Pin No. Mnemonic Function 1, 2 NC No Connection. Do not connect anything other than dummy pads to these pins. 3 ROFSA Bipolar Offset Resistor A. Accepts up to ±18 V. In 2-quadrant mode, ROFSA ties to RFBA. In 4-quadrant mode, ROFSA ties to R1A and the external reference. 4 RFBA Internal Matching Feedback Resistor A. Connects to the external op amp for I-V conversion. 5 R1A 4-Quandrant Resistor. In 2-quadrant mode, R1A shorts to the VREFA pin. In 4-quadrant mode, R1A ties to ROFSA. Do not connect when operating in unipolar mode. 6 RCOMA Center Tap Point of the Two 4-Quadrant Resistors, R1A and R2A. In 4-quadrant mode, RCOMA ties to the inverting node of the reference amplifier. In 2-quadrant mode, RCOMA shorts to the VREF pin. Do not connect if operating in unipolar mode. 7 VREFA DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, VREFA is the reference input with constant input resistance versus code. In 4-quadrant mode, VREFA is driven by the external reference amplifier. 8 IOUTA DAC A Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage output. 9 AGNDA DAC A Analog Ground. 10 DGND Digital Ground. 11 AGNDB DAC B Analog Ground. 12 IOUTB DAC B Current Output. Connects to inverting terminal of external precision I-V op amp for voltage output. 13 VREFB DAC B Reference Input Pin. Establishes DAC full-scale voltage. Constant input resistance versus code. If configured with an external op amp for 4-quadrant multiplying, VREFB becomes –VREF. 14 RCOMB Center Tap Point of the Two 4-Quadrant Resistors, R1B and R2B. In 4-quadrant mode, RCOMB ties to the inverting node of the reference amplifier. In 2-quadrant mode, RCOMB shorts to the VREF pin. Do not connect if operating in unipolar mode. 15 R1B 4-Quandrant Resistor. In 2-quadrant mode, R1B shorts to the VREFB pin. In 4-quadrant mode, R1B ties to ROFSB. Do not connect if operating in unipolar mode. 16 RFBB Internal Matching Feedback Resistor B. Connects to external op amp for I-V conversion. 17 ROFSB Bipolar Offset Resistor B. Accepts up to ±18 V. In 2-quadrant mode, ROFSB ties to RFBB. In 4-quadrant mode, ROFSB ties to R1B and an external reference. 18 WR Write Control Digital Input In, Active Low. Transfers shift register data to the DAC register on the rising edge. Signal level must be ≤ VDD + 0.3 V. 19 A0 Address Pin 0. Signal level must be ≤ VDD + 0.3 V. 20 A1 Address Pin 1. Signal level must be ≤ VDD + 0.3 V. 21 LDAC Digital Input Load DAC Control. Signal level must be ≤ VDD + 0.3 V. 22 MSB Power-On Reset State. MSB = 0 corresponds to zero-scale reset; MSB = 1 corresponds to midscale reset. The signal level must be ≤ VDD + 0.3 V. 23 RS Active low resets both input and DAC registers. Resets to zero-scale if MSB = 0, and to midscale if MSB = 1. Signal level must be ≤ VDD + 0.3 V. 24–28, 30–38 D13 to D0 Digital Input Data Bits D13 to D0. Signal level must be ≤ VDD + 0.3 V. 29 VDD Positive Power Supply Input. The specified range of operation is 2.7 V to 5.5 V. |
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