fOUT (× Input Data Rate)
參數(shù)資料
型號： AD9778A-DPG2-EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 28/56頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD9778A
標(biāo)準(zhǔn)包裝： 1
系列： *
DAC 的數(shù)量： 2
位數(shù)： 14
采樣率（每秒）： 1G
數(shù)據(jù)接口： 并聯(lián)
DAC 型： 電流
工作溫度： -40°C ~ 85°C
已供物品： *
已用 IC / 零件： AD9778A
AD9776A/AD9778A/AD9779A
Rev. B | Page 34 of 56
10
–100
–4
4
fOUT (× Input Data Rate)
AT
T
E
N
UAT
IO
N
(
d
B
)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
06
45
2-
0
55
Figure 58. 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)
AT
T
E
N
UAT
IO
N
(
d
B
)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
06
45
2-
0
56
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 19).
The Nyquist regions of up to 4× the input data rate can be seen
–4
–8
–3×
–6
–2×
–4
–1×
–2
DC
1
1×
3
2×
5
3×
7
–7
–5
–3
–12
4
6
4×
08
06
45
2-
08
6
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 modu-
lation 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 for 8×
interpolation (refer to Table 19 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)
AT
T
E
N
UAT
IO
N
(
d
B
)
06
45
2-
0
58
Figure 61. Interpolation/Modulation Combination of 4fDAC/8 Filter
10
–100
–4
4
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
fOUT (× Input Data Rate)
AT
T
E
N
UAT
IO
N
(
d
B
)
06
45
2-
0
59
Figure 62. Interpolation/Modulation Combination of 3fDAC/8 Filter
10
–100
–4
4
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
fOUT (× Input Data Rate)
AT
T
E
N
UAT
IO
N
(
d
B
)
06
45
2-
0
60
Figure 63. Interpolation/Modulation Combination of 2fDAC/8 Filter
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AD9778BSVZRL 功能描述:IC DAC 14BIT DUAL 1GSPS 100TQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應(yīng)商設(shè)備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k
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