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1654I Datasheet(PDF) 6 Page - Linear Technology |
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1654I Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LTC1654 1654fb CS/LD (Pin 5): The TTL Level Input for the Serial Interface Enable and Load Control. When CS/LD is low, the SCK signal is enabled, so the data can be clocked in. When CS/LD is pulled high, the control/address bits are decoded. DGND/AGND (Pins 6, 12): Digital and Analog Grounds. SDO (Pin 7): The output of the shift register that becomes valid on the rising edge of the serial clock. VOUT A/B (Pins 9, 15): The Buffered DAC Outputs. REFHI A/B (Pins 10, 14): The Reference High Inputs of the LTC1654. There is a gain of 1 from this pin to the output in a gain of 1 configuration. In a gain of 1/2 configuration, there is a gain of 1/2 from this pin to VOUT. REFLO A/B (Pins 11, 13): The Reference Low Inputs of the LTC1654. These inputs can swing up to VCC – 1.5V. VCC (Pin 16): The Positive Supply Input. 2.7V ≤ VCC ≤ 5.5V. Requires a 0.1 µF bypass capacitor to ground. X1/X1/2 B, X1/X1/2 A (Pins 1, 8): The Gain of 1 or Gain of 1/2 Pin. When this pin is tied to VOUT, the output range will be REFLO to (REFLO + REFHI)/2 (0V to REFHI/2 when REFLO = 0V). When this pin is tied to REFLO, the output range will be REFLO to REFHI (0V to REFHI when REFLO = 0V). These pins should not be left floating. CLR (Pin 2): The Asynchronous Clear Input. SCK (Pin 3): The TTL Level Input for the Serial Interface Clock. SDI (Pin 4): The TTL Level Input for the Serial Interface Data. Data on the SDI pin is latched into the shift register on the rising edge of the serial clock. The LTC1654 allows either a 24-bit or 32-bit word. When a 24-bit word is used, the first 8 bits are control and address followed by 16 data bits. The last two of the 16 data bits are don’t cares. When a 32-bit word (required for daisy-chain operation) is used, the first 8-bits are don’t cares and the following 24-bits are as above. 1654 TD01 t1 t4 t3 t5 B0 C3 C3 X X X CURRENT WORD XX X X XX SCK CS/LD SDI SDO t2 t8 t6 t7 t9 (PREVIOUS WORD) TI I G DIAGRA S PI FU CTIO S |
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