参数资料
型号: AD9779BSVZ
厂商: Analog Devices Inc
文件页数: 26/56页
文件大小: 0K
描述: IC DAC 16BIT DUAL 1GSPS 100TQFP
产品培训模块: Data Converter Fundamentals
DAC Architectures
标准包装: 1
位数: 16
数据接口: 串行
转换器数目: 2
电压电源: 模拟和数字
功率耗散(最大): 300mW
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 100-TQFP 裸露焊盘
供应商设备封装: 100-TQFP-EP(14x14)
包装: 托盘
输出数目和类型: 4 电流,单极
采样率(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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