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AD9929BBCZ датащи(PDF) 56 Page - Analog Devices |
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AD9929BBCZ датащи(HTML) 56 Page - Analog Devices |
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56 / 64 page ![]() AD9929 Rev. A | Page 56 of 64 STANDBY MODE OPERATION Recommended Standby Mode Sequence When the AD9929 is going into standby operation, the follow- ing sequence is recommended (refer to Figure 67 for each step). 1. Program OUTCONT_REG (Address 0x05) = 0. This asserts the internal OUTCONT signal low, causing all digital outputs to become disabled. 2. Program registers AFESTBY (Address 0x05) = 0 and DIGSTBY (Address 0x05) = 0. The AD9929 is now in standby operation. 3. When ready to come out of standby operation, program register DIGSTBY (Address 0x05) = 1 and register AFESTBY (Address 0x05) = 1. 4. Program necessary control registers. 5. Program control register MODE (Address 0x0A) = 0. This selects Mode_A operation. 6. Program register OUTCONT_REG (Address 0x05) = 1. This asserts the internal OUTCONT signal high, causing all digital outputs to become active. SERIAL WRITES VD (OUTPUT) DIGITAL OUTPUTS H2, RG, MSHUT, STROBE, FD H1, VSUB CLI (INPUT) HD (OUTPUT) OUTCONT (INTERNAL SIGNAL) AFESTBY (REGISTER) DIGSTBY (REGISTER) DCLK1 AND DCLK21 3 1 NOTES 1DCLK2 WILL BE OUTPUT ON THE FD/DCLK2 PIN 16 PROVIDING REGISTER DCLK2SEL (ADDRESS 0xD5) = 1. 2IT TAKES 11 CLI CLOCKS FROM WHEN OCONT GOES HIGH UNTIL VD, HD, AND DIGITAL OUTPUT DATA IS VALID. 5 6 2 AD9929 SUPPLIES tDELAY2 Figure 67. Recommended Standby Sequence |
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