ADS7953 overshoot problem

Hi everyone;

I have a problem. I'm using ADS7953 IC. The datas which I read manual mode or auto-1 mode are overshoot (e.g. for channel 8;  between "1000 0000 0001 0011" - "1000 1111 0011 1001") I'm using spi protocol. Mcu name is concerto (F28M35Hx). And I'm using SPI-A module.  Could  you help me ?

My codes; (for manual mode)

void main()

{

Initialize();

spi_write(0x1000 | 0x0800 | 0x0400 | 0x0040 | 0x0000 | 0x0000);

for(i=0; i<50; i++) {}  // CPUCLK 150MHz and SCLK 1700000 Hz

while(1)

{

spi_write(0x0000);

for(i=0; i<50; i++) {}

spi_read();

}

}

void spi_write(Uint16 data)

{

SpiaRegs.SPITXBUF = data;

}

void spi_read()

{

 while (SpiaRegs.SPIFFRX.bit.RXFFST != 1) {}

 receive_data = SpiaRegs.SPIRXBUF;

}