fOUT (× Input Data Rate)
參數(shù)資料
型號： AD9776BSVZ
廠商： Analog Devices Inc
文件頁數(shù)： 26/56頁
文件大?。?/td> 0K
描述： IC DAC 12BIT DUAL 1GSPS 100TQFP
產(chǎn)品培訓(xùn)模塊： DAC Architectures
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 12
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 2
電壓電源： 模擬和數(shù)字
功率耗散（最大）： 300mW
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： 4 電流，單極
采樣率（每秒）： 1G
AD9776/AD9778/AD9779
Rev. A | Page 32 of 56
10
–100
–4
4
fOUT (× Input Data Rate)
ATTE
NUATION
(dB)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
05361-056
Figure 59. 8× Interpolation, Low-Pass Response to ±4× Input Data Rate
(Dotted Lines Indicate 1 dB Roll-Off)
With the interpolation filter and modulator combined, the
incoming signal can be placed anywhere within the Nyquist
region of the DAC output sample rate. When the input signal is
complex, this architecture allows modulation of the input signal
to positive or negative Nyquist regions (see Table 17).
The Nyquist regions of up to 4× the input data rate can be seen
–4
×
–8
–3
×
–6
–2
×
–4
–1
×
–2
DC
1
×
3
2
×
5
3
×
7
–7
–5
–3
–1
2
4
6
8
4
×
05361-057
Figure 60. Nyquist Zones
Figure 57, Figure 58, and Figure 59 show the low-pass response
of the digital filters with no modulation. By turning on the
modulation feature, the response of the digital filters can be
tuned to anywhere within the DAC bandwidth. As an example,
Figure 61 to Figure 67 show the nonshifted mode filter responses
(refer to Table 17 for shifted/nonshifted mode filter responses).
10
–100
–4
4
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
fOUT (× Input Data Rate)
ATTE
NUATION
(dB)
05361-058
Figure 61. Interpolation/Modulation Combination of 4 fDAC/8 Filter
10
–100
–4
4
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
fOUT (× Input Data Rate)
ATTE
NUATION
(dB)
05361-059
Figure 62. Interpolation/Modulation Combination of 3 fDAC/8 Filter
10
–100
–4
4
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
fOUT (× Input Data Rate)
ATTE
NUATION
(dB)
05361-060
Figure 63. Interpolation/Modulation Combination of 2 fDAC/8 Filter
10
–100
–4
4
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
fOUT (× Input Data Rate)
ATTE
NUATION
(dB)
05361-061
Figure 64. Interpolation/Modulation Combination of 1 fDAC/8 Filter
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