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1654 Datasheet(PDF) 9 Page - Linear Technology |
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1654 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LTC1654 1654fb Voltage Output The LTC1654 comes complete with rail-to-rail voltage output buffer amplifiers. These amplifiers will swing to within a few millivolts of either supply rail when unloaded and to within a 450mV of either supply rail when sinking or sourcing 5mA. There are two GAIN configuration modes for the LTC1654: a) GAIN of 1: (X1/X1/2 tied to REFLO) VOUT = (VREFHI – VREFLO)(CODE/16384) + VREFLO b) GAIN of 1/2: (X1/X1/2 tied to VOUT) VOUT = (1/2)(VREFHI – VREFLO)(CODE/16384) + VREFLO The LTC 1654 has two SPEED modes: A FAST mode and a SLOW mode. When operating in the FAST mode, the output amplifiers will settle in 3 µs (typ) to 14 bits on a 4V output swing. In the SLOW mode, they will settle in 8.5 µs. The total supply current is 930 µA in the FAST mode and 540 µA in the SLOW mode. The output noise voltage density at 10kHz is 170nV/ √Hz in SLOW mode and 150nV/ √Hz in FAST mode. Power Down Each DAC can also be independently powered down to less than 5 µA/DAC of supply current. The reference pin also goes into a high impedance state when the DAC is powered down and the reference current will drop to below 0.1 µA. The amplifiers’ output stage is also three-stated but the VOUT pins still have the internal gain-setting resistors connected to them resulting in an effective resistance from VOUT to REFLO. This resistance is typically 90k when the X1/X1/2 pin is tied to VOUT and 36k when X1/X1/2 is tied to REFLO. Because of this resistance, VOUT will go to VREFLO when the DAC is powered down and VOUT is unloaded. OPERATIO |
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