參數(shù)資料
型號(hào): AD9148BBCZRL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 48/72頁(yè)
文件大小: 0K
描述: IC DAC 16BIT QD 1GSPS 196CSPBGA
標(biāo)準(zhǔn)包裝: 1,500
系列: TxDAC+®
設(shè)置時(shí)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: 模擬和數(shù)字
功率耗散(最大): 2.22W
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 196-LFBGA,CSPBGA
供應(yīng)商設(shè)備封裝: 196-CSPBGA(12x12)
包裝: 帶卷 (TR)
輸出數(shù)目和類型: 8 電流,單極
采樣率(每秒): 1G
AD9148
Data Sheet
Rev. B | Page 52 of 72
Half-Band Filter 1 (HB1)
HB1 has four modes of operation, as shown in Figure 64. The
shape of the filter response is identical in each of the four modes.
The four modes are distinguished by two factors: the filter center
frequency and whether the filter modulates the input signal.
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)
fIN1)
MODE 0
MODE 1
MODE 3
MODE 2
08910-
063
Figure 64. HB1 Filter Modes
As is shown in Figure 64, the center frequency in each mode is
offset by of the input data rate (fIN1) of the filter. Mode 0 and
Mode 1 do not modulate the input signal. Mode 2 and Mode 3
modulate the input signal by fIN1. When operating in Mode 0
and Mode 2, the I and Q paths operate independently and no
mixing of the data between channels occurs. When operating
in Mode 1 and Mode 3, mixing of the data between the I and Q
paths occurs; therefore, the data input into the filter is assumed
complex. Table 19 summarizes the HB1 modes.
Table 19. 2× Interpolation Filter Modes (Register 0x1C to
Register 0x1E)
Interpolation
Factor
Filter Modes
fCENTER
(fDAC)
Pre-Mod
HB1
HB2
HB3
2
0
Off
0
2
1
Off
fDAC/4
2
0
2
Off
fDAC/2
2
1
3
Off
fDAC/4
Figure 65 shows the pass-band filter response for HB1. 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 20 shows the pass-band flatness
and stop-band rejection the HB1 filter supports at different
bandwidths.
0.02
–0.10
–0.08
–0.06
–0.04
–0.02
0
0.40
0.36
0.32
0.28
0.24
0.20
0.16
0.12
0.08
0.04
M
AG
NI
T
UDE
(
d
B)
fIN1)
08910-
064
Figure 65. Pass-Band Detail of HB1
Table 20. HB1 Pass-Band and Stop-Band Performance by
Bandwidth
Bandwidth (% of fIN1)
Pass-Band
Flatness (dB)
Stop-Band
Rejection (dB)
80
0.001
85
80.4
0.0012
80
81.2
0.0033
70
82.0
0.0076
60
83.6
0.0271
50
85.6
0.1096
40
Half-Band Filter 2 (HB2)
HB2 has eight modes of operation, as shown in Figure 66 and
Figure 67. The shape of the filter response is identical in each of
the eight modes. The eight modes are distinguished by two factors,
the filter center frequency and whether the input signal is
modulated by the filter.
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 0
MODE 2
MODE 6
MODE 4
08910-
065
Figure 66. HB2, Even Filter Modes
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