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DAC8805 Datasheet(PDF) 5 Page - Texas Instruments |
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DAC8805 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 25 page www.ti.com DAC8805 SBAS391A – DECEMBER 2006 – REVISED MAY 2007 PIN ASSIGNMENTS (continued) Table 1. TERMINAL FUNCTIONS PIN # NAME DESCRIPTION 1, 2 NC No connection Bipolar Offset Resistor A. Accepts up to ±18V. 3 ROFSA 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. 4-Quadrant Resistor. 5 R1A In 2-quadrant mode, R1A shorts to the VREFA pin. In 4-quadrant mode, R1A ties to ROFSA and the reference input. Center Tap Point of the Two 4-Quadrant Resistors, R1A and R2A. 6 RCOMA In 2-quadrant mode, RCOMA shorts to the VREF pin. In 4-quadrant mode, RCOMA ties to the inverting node of the reference amplifier. DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. 7 VREFA 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. DAC A Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage 8 IOUTA output. 9 AGNDA DAC A Analog Ground. 10 DGND Digital Ground. 11 AGNDB DAC B Analog Ground. DAC B Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage 12 IOUTB output. DAC B Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. 13 VREFB In 2-quadrant mode, VREFB is the reference input with constant input resistance versus code. In 4-quadrant mode, VREFB is driven by the external reference amplifier. Center Tap Point of the Two 4-Quadrant Resistors, R1B and R2B. 14 RCOMB In 2-quadrant mode, RCOMB shorts to the VREF pin. In 4-quadrant mode, RCOMB ties to the inverting node of the reference amplifier. 4-Quadrant Resistor. 15 R1B In 2-quadrant mode, R1B shorts to the VREFB pin. In 4-quadrant mode, R1B ties to ROFSB and the reference input. 16 RFBB Internal Matching Feedback Resistor B. Connects to external op amp for I-V conversion. Bipolar Offset Resistor B. Accepts up to ±18V. 17 ROFSB In 2-quadrant mode, ROFSB ties to RFBB. In 4-quadrant mode, ROFSB ties to R1B and the external reference. Write Control Digital Input In, Active Low. WR enables input registers. 18 WR Signal level must be ≤ V DD + 0.3V. 19 A0 Address 0. Signal level must be ≤ V DD + 0.3V. 20 A1 Address 1. Signal level must be ≤ V DD + 0.3V. Digital Input Load DAC Control. Signal level must be ≤ V DD + 0.3V. See the Function of Control Inputs 21 LDAC table for details. Power-On Reset State. RSTSEL = 0 corresponds to zero-scale reset. 22 RSTSEL RSTSEL = 1 corresponds to mid-scale reset. The signal level must be ≤ V DD + 0.3V. Reset. Active low resets both input and DAC registers. 23 RS Resets to zero-scale if RSTSEL= 0, and to mid-scale if RSTSEL = 1. Signal level must be equal to or less than VDD + 0.3 V. 24-28, 30-38 D0-D13 Digital Input Data Bits D0 to D13. Signal level must be ≤ V DD +0.3V. D13 is MSB. 29 VDD Positive Power Supply Input. The specified range of operation is 2.7V to 5.5V. 5 Submit Documentation Feedback |
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