AD9777-EB Analog Devices Inc, AD9777-EB Datasheet - Page 36

• Manufacturer Part Number: AD9777-EB
• Description: BOARD EVAL FOR AD9777
• Manufacturer: Analog Devices Inc
• Series: TxDAC+®r

Specifications of AD9777-EB

• Rohs Status: RoHS non-compliant
• Number Of Dac's: 2
• Number Of Bits: 16
• Outputs And Type: 2, Differential
• Sampling Rate (per Second): 160M
• Data Interface: Parallel
• Settling Time: 11ns
• Dac Type: Current
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD9777

AD9777
MODULATION, INTERMODULATION = 4×
With Control Register 01h, Bit 7 and Bit 6 set to 10, the
interpolation rate of the AD9777 is 4×. Modulation is achieved
by multiplying successive samples at the interpolation filter
output by the sequence (0, +1, 0, −1).
The Effects of Digital Modulation on DAC Output Spectrum, Interpolation = 4x
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
Figure 67. 4x Interpolation, Modulation Disabled
Figure 68. 4x Interpolation, Modulation = f
1
1
f
f
OUT
OUT
( ×
( ×
2
2
f
f
DATA
DATA
)
)
3
3
DAC
/2
4
4
Rev. C | Page 36 of 60
Figure 67 to Figure 70 represent the spectral response of the
AD9777 DAC output with 4× interpolation in the various
modulation modes to a narrow band baseband signal.
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
Figure 69. 4x Interpolation, Modulation = f
Figure 70. 4x Interpolation, Modulation = f
1
1
f
f
OUT
OUT
( ×
( ×
2
2
f
f
DATA
DATA
)
)
3
3
DAC
DAC
/4
/8
4
4