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Sine Wave To DAC Using FRDM K64

Question asked by OLIVIA CHRISTY VARGHESE on Feb 1, 2017
Latest reply on Feb 3, 2017 by xiangjun.rong

Hi guys,

 

I am using FRDM K64f to generate a sine wave and give it as the input of DAC and receive a signal with 4.8mv amplitude at the DAC OUT. I generated a sine wave signal and gave to DAC input and received a sine wave at the DAC OUT with 1.65 v   amplitude . I am using processor expert with IAR.

 

I want to reduce the amplite of the signal to 4.8mv .How is it possible with the code. 

This is my code

 

static const LDD_DAC_TData SinusOutputData[SINUS_LENGTH] = {
2047U, 2097U, 2147U, 2198U, 2248U, 2298U, 2347U, 2397U, 2446U, 2496U, 2544U, 2593U, 2641U, 2689U,
2737U, 2784U, 2830U, 2877U, 2922U, 2967U, 3012U, 3056U, 3099U, 3142U, 3184U, 3226U, 3266U, 3306U,
3346U, 3384U, 3422U, 3458U, 3494U, 3530U, 3564U, 3597U, 3629U, 3661U, 3691U, 3721U, 3749U, 3776U,
3803U, 3828U, 3852U, 3875U, 3897U, 3918U, 3938U, 3957U, 3974U, 3991U, 4006U, 4020U, 4033U, 4044U,
4055U, 4064U, 4072U, 4079U, 4084U, 4088U, 4092U, 4093U, 4094U, 4093U, 4092U, 4088U, 4084U, 4079U,
4072U, 4064U, 4055U, 4044U, 4033U, 4020U, 4006U, 3991U, 3974U, 3957U, 3938U, 3918U, 3897U, 3875U,
3852U, 3828U, 3803U, 3776U, 3749U, 3721U, 3691U, 3661U, 3629U, 3597U, 3564U, 3530U, 3494U, 3458U,
3422U, 3384U, 3346U, 3306U, 3266U, 3226U, 3184U, 3142U, 3099U, 3056U, 3012U, 2967U, 2922U, 2877U,
2830U, 2784U, 2737U, 2689U, 2641U, 2593U, 2544U, 2496U, 2446U, 2397U, 2347U, 2298U, 2248U, 2198U,
2147U, 2097U, 2047U, 1997U, 1947U, 1896U, 1846U, 1796U, 1747U, 1697U, 1648U, 1598U, 1550U, 1501U,
1453U, 1405U, 1357U, 1310U, 1264U, 1217U, 1172U, 1127U, 1082U, 1038U, 995U, 952U, 910U, 868U,
828U, 788U, 748U, 710U, 672U, 636U, 600U, 564U, 530U, 497U, 465U, 433U, 403U, 373U,
345U, 318U, 291U, 266U, 242U, 219U, 197U, 176U, 156U, 137U, 120U, 103U, 88U, 74U,
61U, 50U, 39U, 30U, 22U, 15U, 10U, 6U, 2U, 1U, 0U, 1U, 2U, 6U,
10U, 15U, 22U, 30U, 39U, 50U, 61U, 74U, 88U, 103U, 120U, 137U, 156U, 176U,
197U, 219U, 242U, 266U, 291U, 318U, 345U, 373U, 403U, 433U, 465U, 497U, 530U, 564U,
600U, 636U, 672U, 710U, 748U, 788U, 828U, 868U, 910U, 952U, 995U, 1038U, 1082U, 1127U,
1172U, 1217U, 1264U, 1310U, 1357U, 1405U, 1453U, 1501U, 1550U, 1598U, 1648U, 1697U, 1747U, 1796U,
1846U, 1896U, 1947U, 1997U
};

 

for (i = 0; i < SINUS_LENGTH; i++) {

//SinusOutputData[i] = 4096-SinusOutputData[i];
DA0_SetValue(MyDacPtr, (SinusOutputData[i])); /* Set converter output */
}

 

 

Please help...

Thanks and Regards,

olivia

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