參數(shù)資料
型號: AD9857AST
廠商: ANALOG DEVICES INC
元件分類: 通信及網(wǎng)絡(luò)
英文描述: CMOS 200 MSPS 14-Bit Quadrature Digital Upconverter
中文描述: SPECIALTY TELECOM CIRCUIT, PQFP80
封裝: MS-026-BEC, LQFP-80
文件頁數(shù): 6/31頁
文件大?。?/td> 551K
代理商: AD9857AST
AD9857
Typical Modulated Output Spectral Plots
–6–
REV. 0
10
20
30
40
50
60
70
80
90
100
START 0Hz
5MHz/
STOP 50MHz
0
d
Figure 1. QPSK at 42 MHz and 5.12 MS/s; 10.24 MHz
External Clock with REFCLK Multiplier = 12, CIC Interpolation
Rate = 3, 4 Oversampled Data
START 0Hz
4MHz/
STOP 40MHz
8
16
24
32
40
48
56
64
72
80
0
d
Figure 2. 64-QAM at 28 MHz and 6 MS/s; 36 MHz External
Clock with REFCLK Multiplier = 4, CIC Interpolation Rate =
2, 3 Oversampled Data
START 0Hz
8MHz/
STOP 80MHz
10
20
30
40
50
6
0
7
0
8
0
90
100
0
d
Figure 3. 16-QAM at 65 MHz and 2.56 MS/s; 10.24 MHz
External Clock with REFCLK Multiplier = 18, CIC Interpolation
Rate = 9, 4 Oversampled Data
START 0Hz
5MHz/
STOP 50MHz
8
16
24
32
40
48
56
64
72
80
0
d
Figure 4. 256-QAM at 38 MHz and 6 MS/s; 48 MHz External
Clock with REFCLK Multiplier = 4, CIC Interpolation Rate =
2, 4 Oversampled Data
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