AD9773BSVZ Analog Devices Inc, AD9773BSVZ Datasheet - Page 37
AD9773BSVZ
Manufacturer Part Number
AD9773BSVZ
Description
119it 160 MSPS Dual TxDAC+ DAC
Manufacturer
Analog Devices Inc
Series
TxDAC®r
Datasheet
1.AD9773BSVZRL.pdf
(60 pages)
Specifications of AD9773BSVZ
Settling Time
11ns
Number Of Bits
12
Data Interface
Serial, SPI™
Number Of Converters
2
Voltage Supply Source
Analog and Digital
Power Dissipation (max)
410mW
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
80-TQFP Exposed Pad, 80-eTQFP, 80-HTQFP, 80-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AD9773BSVZ
Manufacturer:
Analog Devices Inc
Quantity:
10 000
Part Number:
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Manufacturer:
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Company:
Part Number:
AD9773BSVZRL
Manufacturer:
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Quantity:
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MODULATION, INTERPOLATION = 8×
With Control Register 01h, Bit 7 and Bit 6 set to 11, the
interpolation rate of the AD9773 is 8×. Modulation is achieved
by multiplying successive samples at the interpolation filter
output by the sequence (0, +0.707, +1, +0.707, 0, −0.707, −1,
+0.707). Figure 71 to Figure 74 represent the spectral response
of the AD9773 DAC output with 8× interpolation in the various
modulation modes to a narrow band baseband signal.
The Effects of the Digital Modulation on the DAC Output Spectrum, Interpolation = 8×
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
Figure 71. 8x Interpolation, Modulation Disabled
Figure 72. 8x Interpolation, Modulation = f
1
1
f
f
OUT
OUT
( ×
( ×
2
2
f
f
DATA
DATA
)
)
3
3
DAC
/2
4
4
Rev. D | Page 37 of 60
Looking at Figure 63 to Figure 74, the user can see how higher
interpolation rates reduce the complexity of the reconstruction
filter needed at the DAC output. It also becomes apparent that
the ability to modulate by f
flexibility in frequency planning.
–100
–100
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
Figure 73. 8x Interpolation, Modulation = f
Figure 74. 8x Interpolation, Modulation = f
1
1
2
2
3
3
f
f
S
OUT
OUT
/2, f
(×
(×
4
4
S
f
f
/4, or f
DATA
DATA
)
)
5
5
S
/8 adds a degree of
6
6
DAC
DAC
7
7
/4
/8
AD9773
8
8