DEARS.
End customer is Testing to use DAC5688.
Pls help to check below questions.
DAC5688 internal timing error occurred.
What is the solution?
- DAC5688 Register Value -
Address Hex Value
0x01 0x0A // Normal inputs on CH A & B, 2’s complement, 4x interpolation
0x02 0x09 // INV_SINC filter enabled, Mixer(NCO) enabled
0x03 0x00 // Default
0x04 0x00 // Default
0x06 0x00 // Default
0x07 0x00 // Default
0x16 0x05 // NCO accumulator and registers synchronous with TX_ENABLE
0x17 0x05 // FIFO synchronous with TX_ENABLE
0x1A 0x0C // PLL disabled (Ext. clock in use)
0x08 0x00 // FREQ_NCO[7:0]
0x09 0x00 // FREQ_NCO[15:8]
0x0A 0x00 // FREQ_NCO[23:16]
0x0B 0x50 // FREQ_NCO[31:24] => FREQ_NCO = 0x50000000 => Freq = FREQ_NCO x 400MHz/2^32 = 125MHz
0x05 0xC2 // It`s for use SIF_SYNC as below, but actually, SYNC at TX_ENABLE
0x05 0x82 //
When energize the power, RESETB = LOW maintain dozens of msec, then after set HIGH, register will set as above data.
So, assert TX_ENABLE : 0 -> 1 and synchro at TX_ENABLE for start DAC.
Input data rate is 100MSPS and set oversampling to 400MSPS(by 4x Interpolation) for execut DAC.
Thank you
