參數(shù)資料
型號(hào)： AD9788BSVZRL
廠商： Analog Devices Inc
文件頁數(shù)： 32/64頁
文件大小： 0K
描述： IC DAC 16BIT 800MSPS 100TQFP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
設(shè)計(jì)資源： Powering the AD9788 Using ADP2105 for Increased Efficiency (CN0141)
標(biāo)準(zhǔn)包裝： 1,000
系列： TxDAC®
位數(shù)： 16
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 2
電壓電源： 模擬和數(shù)字
功率耗散（最大）： 450mW
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 100-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 100-TQFP-EP（14x14）
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 4 電流，單極；4 電流，雙極
采樣率（每秒）： 800M
AD9785/AD9787/AD9788
Rev. A | Page 38 of 64
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
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.
10
–100
–4
4
fOUT (× Input Data Rate)
AT
T
E
N
U
AT
IO
N
(
d
B
)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
07
09
8-
0
10
Figure 55. 2× Interpolation, Low-Pass Response to ±4× Input Data Rate
(Dotted Lines Indicate 1 dB Roll-Off)
10
–100
–4
4
fOUT (× Input Data Rate)
A
T
E
NUA
T
IO
N
(
d
B)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
07
09
8-
0
1
Figure 56. 4× Interpolation, Low-Pass Response to ±4× Input Data Rate
(Dotted Lines Indicate 1 dB Roll-Off)
10
–100
–4
4
fOUT (× Input Data Rate)
A
T
E
NUA
T
IO
N
(
d
B)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
07
09
8-
01
2
Figure 57. 8× Interpolation, Low-Pass Response to ±4× Input Data Rate
(Dotted Lines Indicate 1 dB Roll-Off)
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