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AD73360ASUZ-REEL Datasheet(PDF) 33 Page - Analog Devices |
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AD73360ASUZ-REEL Datasheet(HTML) 33 Page - Analog Devices |
33 / 36 page REV. B AD73360 –32– APPENDIX D Configuring a Cascade of Two AD73360s to Operate in Mixed Mode This section describes a typical sequence of control words that would be sent to a cascade of two AD73360s to configure them for operation in Mixed Mode. It is not intended to be a defini- tive initialization sequence, but will show users the typical input/ output events that occur in the programming and operation phases 1. This description panel refers to Figure 35. In Step 1, we have the first output sample event following device reset. The SDOFS signal is raised on both devices simulta- neously, which prepares the DSP Rx register to accept the ADC word from Device 2 while SDOFS from Device 1 becomes an SDIFS to Device 2. The cascade is configured as nonFSLB, which means that the DSP has control over what is transmitted to the cascade. The DSP will receive an invalid ADC word from Device 2 and simultaneously Device 2 is receiving an invalid ADC word from Device 1. As both AD73360s are in Program Mode there is only one output event per sample period. The DSP can now send a control word to the AD73360s. In Step 2, the DSP has finished transmitting the control word to Device 1. Device 1 recognizes that this word is not intended for it so it will decrement the address field and generate and SDOFS and proceed to transmit the control word to the next device in the chain. At this point the DSP should transmit a control word for Device 1. This will ensure that both devices receive, and act upon, the control words at the same time. Step 3 shows completion of the first series of control word writes. The DSP has now received an ADC word from Device 2 and each device has received a control word that addresses Control Register B and sets the SCLK and Sample Rate. When pro- gramming a cascade of AD73360s in NonFSLB it is important to ensure that control words which affect the operation of the serial port are received by all devices simultaneously. In Step 4, another sample interval has occurred and the SDOFS on both devices are raised. Device 2 sends an ADC result to the DSP and Device 1 sends an ADC result to Device 2. The remaining time before the next sample interval can be used to program more registers in the AD73360s. Care must be taken that the subsequent writes do not overlap the next sample interval to avoid corrupting the data. The control words are written as Device 2, Device 1, Device 2, etc. Step 5 shows the DSP starting to program the ADC Control Register to select channel gains, operating modes etc. In this case the first write operation programs Control Register D to power up ADC channels 1 and 2 with gains of 0 dBs. This step can be repeated until all the registers have been programmed. The devices should be programmed in the order Device 2, Device 1, Device 2, etc. In Step 6, the DSP transmits a control word for Device 2. This control word set the Device count to 2 and instructs the AD73360 to go into Mixed Mode. When Device 1 receives this control word it will decrement the address field and generate an SDOFS to pass it on to Device 2. In Step 7, the DSP transmits a control word for Device 1. This should happen as Device 1 is transmitting the control word for Device 2 to ensure that both device change into Mixed Mode at the same time. In Step 8, we begin receiving the first valid ADC words from the cascade. It is assumed that there is sufficient time to transmit all the required Control Words in the allotted time. NOTE 1This sequence assumes that the DSP SPORT’s Rx and Tx interrupts are enabled. It is important to ensure there is no latency (separation) between control words in a cascade configuration. This is especially the case when programming Control Register B, as it contains settings for SCLK and DMCLK rates. |
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