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LTC1654 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1654 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1654 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 OPERATION Table 1. CONTROL C3 C2 C1 C0 0000 Load Input Register n 0001 Update (Power-Up) DAC Register n 0010 Load Input Register n, Update (Power-Up) All 0011 Load and Update n 0100 Power Down n 0101 Fast n (Speed States are Maintained Even If DAC is Put in Power-Down Mode) 0110 Slow n (Default State is Slow When Supplies are Powered Up) 0111 Reserved (Do Not Use) 1000 Reserved (Do Not Use) 1001 Reserved (Do Not Use) 1010 Reserved (Do Not Use) 1011 Reserved (Do Not Use) 1100 Reserved (Do Not Use) 1101 Reserved (Do Not Use) 1110 Reserved (Do Not Use) 1111 No Operation 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. ADDRESS (n) A3 A2 A1 A0 0000 DAC A 0001 DAC B 0010 Reserved (Do Not Use) 0011 Reserved (Do Not Use) 0100 Reserved (Do Not Use) 0101 Reserved (Do Not Use) 0110 Reserved (Do Not Use) 0111 Reserved (Do Not Use) 1000 Reserved (Do Not Use) 1001 Reserved (Do Not Use) 1010 Reserved (Do Not Use) 1011 Reserved (Do Not Use) 1100 Reserved (Do Not Use) 1101 Reserved (Do Not Use) 1110 Reserved (Do Not Use) 1111 Both DACs INPUT WORD C3 CONTROL ADDRESS DATA (14 + 2 DUMMY LSBs) C2 C1 C0 A3 A2 A1 A0 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X 1654 TABLE |
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