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AD5450 Datasheet(PDF) 8 Page - Analog Devices |
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AD5450 Datasheet(HTML) 8 Page - Analog Devices |
8 / 20 page AD5547/AD5557 Data Sheet Rev. D | Page 8 of 20 NC 1 NC 2 ROFSA 3 RFBA 4 R1A 5 VREFA 7 IOUTA 8 AGNDA 9 DGND 10 AGNDB 11 IOUTB 12 VREFB 13 RCOMB 14 R1B 15 RFBB 16 ROFSB 17 18 A0 19 RCOMA 6 WR NC = NO CONNECT D0 38 D1 37 D2 36 D3 35 D4 34 D5 33 D6 32 D7 31 D8 30 VDD 29 D9 28 D10 27 D11 26 D12 25 D13 24 23 MSB 22 LDAC 21 A1 20 RS AD5557 TOP VIEW (Not to Scale) Figure 5. AD5557 Pin Configuration Table 4. AD5557 Pin Function Descriptions Pin No. Mnemonic Function 1, 2 NC No Connection. Do not connect anything other than the dummy pads to these pins. 3 R OFSA Bipolar Offset Resistor A. Accepts up to ±18 V. In 2-quadrant mode, R OFSA ties to RFBA. In 4-quadrant mode, ROFSA ties to R 1A and the external reference. 4 R FBA Internal Matching Feedback Resistor A. Connects to the external op amp for I-to-V conversion. 5 R 1A 4-Quandrant Resistor. In 2-quadrant mode, R 1A shorts to the VREFA pin. In 4-quadrant mode, R1A ties to ROFSA. Do not connect when operating in unipolar mode. 6 R COMA Center Tap Point of the Two 4-Quadrant Resistors, R 1A and R2A. In 4-quadrant mode, RCOMA ties to the inverting node of the reference amplifier. In 2-quadrant mode, R COMA shorts to the VREFA pin. Do not connect if operating in unipolar mode. 7 V REFA DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, V REFA is the reference input with constant input resistance vs. code. In 4-quadrant mode, V REFA is driven by the external reference amplifier. 8 I OUTA DAC A Current Output. Connects to the inverting terminal of external precision I-to-V op amp for voltage output. 9 AGNDA DAC A Analog Ground. 10 DGND Digital Ground. 11 AGNDB DAC B Analog Ground. 12 I OUTB DAC B Current Output. Connects to inverting terminal of external precision I-to-V op amp for voltage output. 13 V REFB DAC B Reference Input Pin. Establishes DAC full-scale voltage. Constant input resistance vs. code. If configured with an external op amp for 4-quadrant multiplying, V REFB becomes –VREF. 14 R COMB Center Tap Point of the Two 4-Quadrant Resistors, R 1B and R2B. In 4-quadrant mode, RCOMB ties to the inverting node of the reference amplifier. In 2-quadrant mode, R COMB shorts to the VREFB pin. Do not connect if operating in unipolar mode. 15 R 1B 4-Quandrant Resistor. In 2-quadrant mode, R 1B shorts to the VREFB pin. In 4-quadrant mode, R1B ties to ROFSB. Do not connect if operating in unipolar mode. 16 R FBB Internal Matching Feedback Resistor B. Connects to external op amp for I-to-V conversion. 17 R OFSB Bipolar Offset Resistor B. Accepts up to ±18 V. In 2-quadrant mode, R OFSB ties to RFBB. In 4-quadrant mode, ROFSB ties to R 1B 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 ≤V DD + 0.3 V. 19 A0 Address Pin 0. Signal level must be ≤V DD + 0.3 V. 20 A1 Address Pin 1. Signal level must be ≤V DD + 0.3 V. 21 LDAC Digital Input Load DAC Control. Signal level must be ≤V DD + 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 ≤V DD + 0.3 V. |
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