Datasheet

AD9786
Rev. B | Page 34 of 56
0
–
f
DAC
–7f
DAC
/8
–3
f
DAC
/4
–5
f
DAC
/8
–
f
DAC
/2
–3
f
DAC
/8
–
f
DAC
/4
–
f
DAC/8
f
DAC/8
f
DAC/4
3f
DAC/8
f
DAC/2
5f
DAC/8
3f
DAC/4
7f
DAC/8
f
DAC
FILTERED INTERPOLATION IMAGES
f
S
/8 MODULATION
–f
DAC
–7f
DAC
/8
–3
f
DAC
/4
–5
f
DAC
/8
–
f
DAC
/2
–3
f
DAC
/8
–
f
DAC
/4
–
f
DAC/8
f
DAC/8
f
DAC/4
3f
DAC/8
f
DAC/2
5f
DAC/8
3f
DAC/4
7f
DAC/8
f
DAC
03152-059
Figure 59. Double Sideband Modulation
–8 –6 –4 –2 0 2 4 68
–
150
–
100
–50
0
NO INTERPOLATION
×2 INTERPOLATION
f
SIN
f
SIN
×4 INTERPOLATION
f
SIN
×8 INTERPOLATION
f
SIN
INTERP[1] = 0
INTERP[0] = 0
MOD[1] = 0
MOD[0] = 1
INTERP[1] = 0
INTERP[0] = 1
MOD[1] = 0
MOD[0] = 1
INTERP[1] = 1
INTERP[0] = 0
MOD[1] = 0
MOD[0] = 1
INTERP[1] = 1
INTERP[0] = 1
MOD[1] = 0
MOD[0] = 1
–8–6–4–202468
–
150
–
100
–50
0
–8–6–4–202468
–
150
–
100
–50
0
–8 –6 –4
–202468
–
150
–
100
–50
0
03152-060
Figure 60. Real Modulation by f
DAC
/2 Under All Interpolation Modes