參數(shù)資料
型號(hào): AD9785BSVZ
廠商: Analog Devices Inc
文件頁數(shù): 32/64頁
文件大?。?/td> 0K
描述: IC DAC 12BIT 800MSPS 100TQFP
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝: 1
系列: TxDAC®
位數(shù): 12
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: 托盤
輸出數(shù)目和類型: 2 電流,單極;2 電流,雙極
采樣率(每秒): 800M
產(chǎn)品目錄頁面: 785 (CN2011-ZH PDF)
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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