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AD5547CRUZ-REEL7 Datasheet(PDF) 6 Page - Analog Devices |
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AD5547CRUZ-REEL7 Datasheet(HTML) 6 Page - Analog Devices |
6 / 20 page AD5547/AD5557 Data Sheet Rev. D | Page 6 of 20 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS AD5547 TOP VIEW (Not to Scale) D1 1 D0 2 ROFSA 3 RFBA 4 R1A 5 VREFA 7 IOUTA 8 AGNDA 9 DGND 10 AGNDA 11 IOUTB 12 VREFB 13 RCOMB 14 R1B 15 RFBB 16 ROFSB 17 18 A0 19 D2 38 D3 37 D4 36 D5 35 D6 34 D7 33 D8 32 D9 31 D10 30 VDD 29 D11 28 D12 27 D13 26 D14 25 D15 24 23 MSB 22 LDAC 21 A1 20 RCOMA 6 WR RS Figure 4. AD5547 Pin Configuration Table 3. AD5547 Pin Function Descriptions Pin No. Mnemonic Function 1, 2, 24 to 28, 30 to 38 D0 to D15 Digital Input Data Bits D0 to D15. Signal level must be ≤ V DD + 0.3 V. 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 associated 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. WR transfers shift register data to the DAC register on the rising edge. Signal level must be ≤V DD + 0.3 V. |
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