f
參數(shù)資料
型號: AD9148BBPZRL
廠商: Analog Devices Inc
文件頁數(shù): 49/72頁
文件大?。?/td> 0K
描述: IC DAC 16BIT SPI/SRL 196BGA
標(biāo)準(zhǔn)包裝: 1,500
系列: TxDAC+®
設(shè)置時間: 20ns
位數(shù): 16
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 4
電壓電源: 單電源
功率耗散(最大): 2.67W
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 196-LFBGA 裸露焊盤
供應(yīng)商設(shè)備封裝: 196-BGA
包裝: 帶卷 (TR)
輸出數(shù)目和類型: 4 電流,單極
采樣率(每秒): 1G
Data Sheet
AD9148
Rev. B | Page 53 of 72
0
–20
–40
–60
–80
–100
0
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
M
AG
NI
T
UDE
(
d
B)
fIN2)
MODE 1
MODE 3
MODE 7
MODE 5
08910-
066
Figure 67. HB2, Odd Filter Modes
As shown in Figure 66 and Figure 67, the center frequency in
each mode is offset by of the input data rate (fIN2) of the filter.
Mode 0 through Mode 3 do not modulate the input signal. Mode 4
through Mode 7 modulate the input signal by fIN2. When operating
in Mode 0 and Mode 4, the I and Q paths operate independently,
and no mixing of the data between channels occurs. When
operating in the other six modes, mixing of the data between
the I and Q paths occurs; therefore, the data input to the filter
is assumed complex. Table 21 summarizes the HB2 modes.
Table 21. 4× Interpolation Filter Modes (Register 0x1C to
Register 0x1E)
Interpolation
Factor
Filter Modes
fCENTER
(fDAC)
Pre-Mod
HB1
HB2
HB3
4
0
Off
0
4
1
Off
fDAC/8
4
0
2
Off
fDAC/4
4
1
3
Off
3fDAC/8
4
0
4
Off
fDAC/2
4
1
5
Off
3fDAC/8
4
0
2
6
Off
fDAC/4
4
1
3
7
Off
fDAC/8
Figure 68 shows the pass-band filter response for HB2. In most
applications, the usable bandwidth of the filter is limited by the
image suppression provided by the stop-band rejection and not
by the pass-band flatness. Table 22 shows the pass-band flatness
and stop-band rejection the HB2 filter supports at different
bandwidths.
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
0
0.32
0.28
0.24
0.20
0.16
0.12
0.08
0.04
M
AG
NI
T
UDE
(
d
B)
fIN2)
08910-
067
Figure 68. Pass-Band Detail of HB2
Table 22. HB2 Pass-Band and Stop-Band Performance by
Bandwidth
Bandwidth (% of fIN2)
Pass-Band
Flatness (dB)
Stop-Band
Rejection (dB)
50
0.001
85
50.8
0.0012
80
52.8
0.0028
70
56.0
0.0089
60
0.0287
50
64.8
0.1877
40
Half-Band Filter 3 (HB3)
HB3 has eight modes of operation that function the same as HB2.
The primary difference between HB2 and HB3 are the filter
bandwidths. Table 23 summarizes the filter modes for HB3.
Table 23. 8× Interpolation Filter Modes (Register 0x1C to
Register 0x1E)
Interpolation
Factor
Filter Modes
fCENTER
(fDAC)
Pre-Mod
HB1
HB2
HB3
8
0
8
0
2
1
fDAC/8
8
0
4
2
fDAC/4
8
0
2
6
3
3fDAC/8
8
0
4
fDAC/2
8
0
2
5
3fDAC/8
8
0
4
6
fDAC/4
8
0
2
6
7
fDAC/8
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