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LTC1650 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1650 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1650 Serial Interface The data on the DIN input is loaded into the shift register on the rising edge of the clock. Data is loaded as one 16-bit word, MSB first. The DAC register loads the data from the shift register when CS/LD is pulled high. The clock is disabled internally when CS/LD is high. Note: CLK must be low before CS/LD is pulled low to avoid an extra internal clock pulse. The buffered output of the 16-bit shift register is available on the DOUT pin which swings from DGND to DVDD. Multiple LTC1650s may be daisy-chained together by connecting the DOUT pin to the DIN pin of the next chip while the clock and CS/LD signals remain common to all chips in the daisy chain. The serial data is clocked to all of the chips, then the CS/LD signal is pulled high to update all of them simultaneously. When CLR is pulled low or when the part powers up, the output connects through an internal pass gate to VRST and will go to whatever voltage is on VRST. When any of three supplies (DVDD, AVDD, |AVSS|) goes below 2.5V, the RSTOUT pin goes low and stays low as long as the supply is below 2.5V. The power-on reset is also activated when one of the supplies drops below 2.5V and the output is then connected to VRST. The output connects to VRST when any of three conditions occur: CLR goes low, the part powers up or one of the supplies drops below 2.5V. This condition exists as long as CS/LD is low. As soon as CS/LD goes high, the DAC register is loaded with the data in the shift register and the output will settle to its new value. Voltage Output The LTC1650 rail-to-rail buffered output can source or sink 5mA over the entire operating temperature range. The output is specified to swing up to ±4.5V on ±4.75V supplies with VOUT unloaded. (For typical output swing at various load currents, refer to the typical curve “Minimum Supply Headroom for Full Output Swing vs Load Cur- rent.”) The buffer amplifier can drive 1000pF without going into oscillation. The LTC1650 has a deglitched voltage output. The midscale glitch is less than 2nV-s. The digital feedthrough is about 0.05nV-s. Output Ranges The LTC1650 is capable of unipolar or bipolar output swing. When the UNI/BIP pin is connected to VOUT the part is configured for unipolar operation and the output will swing from REFLO to REFHI. When UNI/BIP is connected to REFHI the part is configured in bipolar mode and the output will swing from (2 • REFLO – REFHI) to REFHI and will be at REFLO at midscale. With REFLO = 0V the output swing is ±REFHI in bipolar mode and 0V to REFHI in unipolar mode. OPERATIO |
Similar Part No. - LTC1650_15 |
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Similar Description - LTC1650_15 |
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