Analog Devices AD9776A Manual page 36

AD9776A/AD9778A/AD9779A
Table 19. Interpolation Filter Modes, (Register 0x01, Bits[5:2])
Interpolation Filter Modulation
Factor[7:6] Mode[5:2]
8 0x00
8 0x01
8 0x02
8 0x03
8 0x04
8 0x05
8 0x06
8 0x07
8 0x08
8 0x09
8 0x0A
8 0x0B
8 0x0C
8 0x0D
8 0x0E
8 0x0F
4 0x00
4 0x01
4 0x02
4 0x03
4 0x04
4 0x05
4 0x06
4 0x07
2 0x00
2 0x01
2 0x02
2 0x03
Nyquist Zone
Modulation Pass Band
DC 0
DC shifted +1
f /8 +2
DAC
f /8 shifted +3
DAC
f /4 +4
DAC
f /4 shifted +5
DAC
3f /8 +6
DAC
3f /8 shifted +7
DAC
f /2 ±8
DAC
f /2 shifted −7
DAC
−3f /8 −6
DAC
−3f /8 shifted −5
DAC
−f /4 −4
DAC
−f /4 shifted −3
DAC
−f /8 −2
DAC
−f /8 shifted −1
DAC
DC 0
DC shifted +1
f /4 +2
DAC
f /4 shifted +3
DAC
f /2 ±4
DAC
f /2 shifted −3
DAC
−f /4 −2
DAC
−f /4 shifted −1
DAC
DC 0
DC shifted +1
f /2 ±2
DAC
f /2 shifted −1
DAC
Rev. B | Page 36 of 56
Frequency Normalized to f
Low Center High
−0.05 0 +0.05
+0.0125 +0.0625 +0.1125
+0.075 +0.125 +0.175
+0.1375 +0.1875 +0.2375
+0.2 +0.25 +0.3
+0.2625 +0.3125 +0.3625
+0.325 +0.375 +0.425
+0.3875 +0.4375 +0.4875
−0.55 −0.5 −0.45
−0.4875 −0.4375 −0.3875
−0.425 −0.375 −0.343
−0.3625 −0.3125 −0.2625
−0.3 −0.25 −0.2
−0.2375 −0.1875 −0.1375
−0.175 −0.125 −0.075
−0.1125 −0.0625 −0.0125
−0.1 0 +0.1
+0.025 +0.125 +0.225
+0.15 +0.25 +0.35
+0.275 +0.375 +0.475
−0.6 −0.5 −0.4
−0.475 −0.375 −0.275
−0.35 −0.25 −0.15
−0.225 −0.125 −0.025
−0.2 0 +0.2
+0.05 +0.25 +0.45
−0.7 −0.5 −0.3
−0.45 −0.25 −0.05
DAC
Comments
In 8× interpolation;
BW (min) = 0.0375 × f
DAC
BW (max) = 0.1 × f
DAC
In 4× interpolation;
BW (min) = 0.075 × f
DAC
BW (max) = 0.2 × f
DAC
In 2× interpolation;
BW (min) = 0.15 × f
DAC
BW (max) = 0.4 × f
DAC