AD9788-EBZ Analog Devices Inc, AD9788-EBZ Datasheet - Page 38
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AD9788-EBZ
Manufacturer Part Number
AD9788-EBZ
Description
BOARD EVAL FOR AD9788
Manufacturer
Analog Devices Inc
Series
TxDAC®r
Datasheet
1.AD9785BSVZ.pdf
(64 pages)
Specifications of AD9788-EBZ
Design Resources
Powering the AD9788 Using ADP2105 for Increased Efficiency (CN0141)
Number Of Dac's
2
Number Of Bits
16
Outputs And Type
2, Differential
Sampling Rate (per Second)
800M
Data Interface
Serial
Settling Time
22ms
Dac Type
Current
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD9788
Silicon Manufacturer
Analog Devices
Application Sub Type
DAC
Kit Application Type
Data Converter
Silicon Core Number
AD9788
Kit Contents
Board
Development Tool Type
Hardware - Eval/Demo Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
AD9785/AD9787/AD9788
DIGITAL DATAPATH
The AD9785/AD9787/AD9788 digital datapath consists of
three 2× half-band interpolation filters, a quadrature modulator,
and an inverse sinc filter. A 32-bit NCO provides the sine and
cosine carrier signals required for the quadrature modulator.
INTERPOLATION FILTERS
The AD9785/AD9787/AD9788 contain three half-band filters
that can be bypassed. This allows the device to operate with 2×,
4×, or 8× interpolation rates, or without interpolation. The
interpolation filters have a linear phase response. The coefficients
of the low-pass filters are given in Table 28, Table 29, and
Table 30. Spectral plots for the filter responses are shown in
Figure 55, Figure 56, and Figure 57.
In 2×, 4×, or 8× interpolation mode, the usable bandwidth of
the interpolation filter is 80% of the complex input data rate.
The usable bandwidth has a pass-band ripple of less than
0.0005 dB and a stop-band attenuation of greater than 85 dB.
The center frequency of the interpolation filter is set by the
NCO frequency tuning word (Register 0x0A, Bits [31:0]), so
baseband input signals are always centered in the interpolation
filter pass band.
Figure 55. 2× Interpolation, Low-Pass Response to ±4× Input Data Rate
–100
–10
–20
–30
–40
–50
–60
–70
–80
–90
10
0
–4
–3
(Dotted Lines Indicate 1 dB Roll-Off)
–2
f
OUT
–1
(×
Input Data Rate)
0
1
2
3
4
Rev. A | Page 38 of 64
Figure 56. 4× Interpolation, Low-Pass Response to ±4× Input Data Rate
Figure 57. 8× Interpolation, Low-Pass Response to ±4× Input Data Rate
–100
–100
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
10
10
0
0
–4
–4
–3
–3
(Dotted Lines Indicate 1 dB Roll-Off)
(Dotted Lines Indicate 1 dB Roll-Off)
–2
–2
f
f
OUT
OUT
–1
–1
(×
(×
Input Data Rate)
Input Data Rate)
0
0
1
1
2
2
3
3
4
4