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The AD1835A has 15 control registers, 13 of which are used toset the operaTIng mode of the part. The other two registers,ADC Peak 0 and ADC Peak 1, are read-only and should notbe programmed. Each of the registers is 10 bits wide with theexcepTIon of the ADC peak reading registers, which are six bitswide. WriTIng to a control register requires a 16-bit data frameto be transmitted. Bits 15 to 12 are the address bits of therequired register. Bit 11 is a read/write bit. Bit 10 is reservedand should always be programmed to 0. Bits 9 to 0 contain the10-bit value that is to be written to the register or, in the case of aread operaTIon, the 10-bit register contents. Figure 3 showsthe format of the SPI read and write operation.
