Hello. i'm working in a design with a AD9589 that i haven't design. i have built the PCB but the device is nor working correctly. I attach a PDF with the schematic if you see any issue.
The device is correctly supplied but in the pin IOUT i have a constant 1.8V.
I have observed that the in the pin 8 i have a signal of 25 MHz and 60mVpp, but in the pin 9 i only have noise. I think that i should have the same signal but opposite than the pin 8, but i have changed the crystal two times and the result is the same.
This is a sample code that i have written. i'm using Maple IDE of LeafLabs
//Constants
//========
#define PIN_DDS_IO_UPDATE D9
#define PIN_DDS_CS_ D14
#define PIN_SCLK D13
#define PIN_SDIO D11
#define PIN_DDS_RESET D4
// Use SPI port number 1
//========
HardwareSPI spi(1);
void setup() {
// Turn on the SPI port pinMode(PIN_DDS_IO_UPDATE, OUTPUT); digitalWrite(PIN_DDS_IO_UPDATE, LOW); pinMode(PIN_DDS_CS_, OUTPUT); digitalWrite(PIN_DDS_CS_, HIGH); pinMode(PIN_DDS_RESET, OUTPUT); digitalWrite(PIN_DDS_RESET, LOW); spi.begin(SPI_1_125MHZ, MSBFIRST, SPI_MODE_3);
}
void loop() {
// Print out the response received.
START_PROG: SerialUSB.println("Pulse 'c' para continuar"); while(1){ if ((SerialUSB.available()) && (SerialUSB.read()=='c')) break; } //Reset DDS //======== digitalWrite(PIN_DDS_RESET, HIGH); delay(1); digitalWrite(PIN_DDS_RESET, LOW); delay(1000); //Register 0: SDO enabled. Clk sync out disabled //===================================== digitalWrite(PIN_DDS_CS_, LOW); spi.transfer(0x00); //Write spi.transfer(0x00); spi.transfer(0x00); spi.transfer(0x02); spi.transfer(0x12); digitalWrite(PIN_DDS_CS_, HIGH); digitalWrite(PIN_DDS_IO_UPDATE, HIGH); digitalWrite(PIN_DDS_IO_UPDATE, LOW); //PLL on, M=16, fsys = 400MHz //===================================== digitalWrite(PIN_DDS_CS_, LOW); spi.transfer(0x01); //Write spi.transfer(0x00); spi.transfer(0x00); spi.transfer(0x80); digitalWrite(PIN_DDS_CS_, HIGH); digitalWrite(PIN_DDS_IO_UPDATE, HIGH); digitalWrite(PIN_DDS_IO_UPDATE, LOW); // enable clock //===================================== digitalWrite(PIN_DDS_CS_, LOW); spi.transfer(0x00); //Write spi.transfer(0x00); spi.transfer(0x00); spi.transfer(0x02); spi.transfer(0x00); digitalWrite(PIN_DDS_CS_, HIGH); digitalWrite(PIN_DDS_IO_UPDATE, HIGH); digitalWrite(PIN_DDS_IO_UPDATE, LOW); // Configure frequency waveform // freq = 400*FTW/2^32 = 70 MHz // FTW = 70*2^32/400 = 0x2CCCCCCD //===================================== digitalWrite(PIN_DDS_CS_, LOW); spi.transfer(0x04); //Write spi.transfer(0x2C); //Data spi.transfer(0xCC); spi.transfer(0xCC); spi.transfer(0xCD); digitalWrite(PIN_DDS_CS_, HIGH); digitalWrite(PIN_DDS_IO_UPDATE, HIGH); digitalWrite(PIN_DDS_IO_UPDATE, LOW);
}