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S9318 Datasheet(PDF) 2 Page - Summit Microelectronics, Inc. |
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S9318 Datasheet(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 6 page 2 S9318 2016-04 4/24/99 Analog Section The S9318 is an 8-bit, voltage output digital-to-analog converter (DAC). The DAC consists of a resistor network that converts an 8-bit value into equivalent analog output voltages in proportion to the applied reference voltage. Reference Inputs The voltage differential between the VL and VH inputs sets the full-scale output voltage range. VL must be equal to or greater than ground (i.e. a positive voltage). VH must be greater than VL and less than or equal to VDD. See table on page 3 for guaranteed operating limits. Output Buffer Amplifier The voltage output is a precision unity-gain follower that can slew up to 1V/ µs. Digital Interface The interface is designed to emulate a simple up/down counter, but instead of a parallel count output, a ratiometric voltage output is provided. PINOUT Chip Select ( CS CS CS CS CS) is an active low input. Whenever CS is high the S9318 is in standby mode and consumes the least power. This mode is equivalent to a potentiometer that is adjusted to the required setting. When CS is low the S9318 will recognize transitions on the INC input and will move the VOUT either toward the VH reference or toward the VL reference depending upon the state of the UP/DN input. The host may exit an adjustment routine in two ways: deselecting the S9318 while INC is low will not perform a store operation (a subsequent power cycle will recall the original data); deselecting the S9318 while INC is high will store the current VOUT setting into nonvolatile memory. Increment ( INC INC INC INC INC) is an edge triggered input. Whenever CS is low and a high to low transition occurs on the INC input, the VOUT voltage will either move toward VH or VL depending upon the state of the UP/ DN input. UP/Down (UP/ DN DN DN DN DN) is an input that will determine the VOUT movement relative to VH and VL. When CS is low, UP/DN is high and there is a high to low transition on INC, the VOUT voltage will move (1/256th x VH-VL) toward VH. When CS and UP/DN are low, and there is a high to low transition on INC, the VOUT will move (1/256th x VH-VL) toward VL. INC UP/DN VH GND 1 2 3 4 8 7 6 5 2016 ILL1.1 VDD CS VL VOUT PIN NAMES Symbol Description INC Increment Input, High to Low Edge Trigger UP/ DN Up/Down Input controlling relative VOUT movement VH V+ reference input GND Analog and Digital Ground VOUT Trimmed Voltage Output VL V- reference input CS Active low chip select input VDD Supply Voltage (2.7V to 5.5V) |
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