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AD7233BN Scheda tecnica(PDF) 5 Page - Analog Devices |
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AD7233BN Scheda tecnica(HTML) 5 Page - Analog Devices |
5 / 8 page AD7233 REV. B –5– There are two ways in which the DAC latch and hence the ana- log output may be updated. The status of the LDAC input is examined after SYNC is taken low. Depending on its status, one of two update modes is selected. If LDAC = 0 then the automatic update mode is selected. In this mode the DAC latch and analog output are updated auto- matically when the last bit in the serial data stream is clocked in. The update thus takes place on the sixteenth falling SCLK edge. If LDAC = 1 then the automatic update is disabled and the DAC latch is updated by taking LDAC low any time after the 16-bit data transfer is complete. The update now occurs on the falling edge of LDAC. This facility is useful for simultaneous update in multi-DAC systems. Note that the LDAC input must be taken back high again before the next data transfer is initiated. SYNC SCLK SDIN LDAC RESET 16 COUNTER/ DECODER GATING SIGNAL AUTO-UPDATE CIRCUITRY GATING SCLK DAC LATCH (12 BITS) INPUT SHIFT REGISTER (16 BITS) Figure 2. Simplified Loading Structure DB15 DON’T CARE DB14 DON’T CARE DB13 DON’T CARE DB12 DON’T CARE DB11 MSB DB1 DB0 LSB t 2 t 1 t 4 t 5 t 3 t 6 t 7 t 8 SYNC SCLK SDIN LDAC Figure 3. Timing Diagram |
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