參數(shù)資料
型號(hào)： AD9146BCPZ
廠商： Analog Devices Inc
文件頁數(shù)： 28/56頁
文件大?。?/td> 0K
描述： IC DAC 16BIT SRL DUAL 48LFCSP
標(biāo)準(zhǔn)包裝： 1
系列： TxDAC+®
設(shè)置時(shí)間： 20ns
位數(shù)： 16
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 2
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 48-WFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 48-LFCSP-WQ（7x7）
包裝： 托盤
輸出數(shù)目和類型： 2 電流，單極
采樣率（每秒）： 1.23G
AD9146
Data Sheet
Rev. A | Page 34 of 56
Figure 44 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 18 shows the pass-band flatness
and stop-band rejection supported by the HB2 filter 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
09691-
049
M
AG
NI
T
UDE
(
d
B)
FREQUENCY (×
fIN2) (Hz)
Figure 44. Pass-Band Detail of HB2
Table 18. 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
0.0089
60
0.0287
50
64.8
0.1877
40
DATAPATH CONFIGURATION
Configuring the AD9146 datapath starts with the application
requirements of the input data rate, the interpolation ratio, the
output signal bandwidth, and the output signal center frequency.
Given these four parameters, the first step in configuring the
datapath is to verify that the device supports the bandwidth
requirements. The modes of the interpolation filters are then
chosen.
DETERMINING INTERPOLATION FILTER MODES
Table 19 shows the recommended interpolation filter settings
for a variety of filter interpolation factors, filter center frequencies,
and signal modulation. The interpolation modes were chosen
based on the final center frequency of the signal and by deter-
mining the frequency shift of the signal required. When these
parameters are known and put in terms of the input data rate
(fDATA), the filter configuration that comes closest to matching
is selected from Table 19.
Table 19. Recommended Interpolation Filter Modes (Register 0x1C and Register 0x1D)
Interpolation Factor
Filter Modes
fSIGNAL Modulation
fCENTER Shift
HB1[1:0]
HB2[5:0]
4
00 (Mode 0)
000000
DC
0
4
01 (Mode 1)
001001
fDATA/2
4
10 (Mode 2)
010010
fDATA
4
11 (Mode 3)
011011
fDATA1
3fDATA/2
4
00 (Mode 0)
100100
2fDATA
4
01 (Mode 1)
101101
2fDATA1
5fDATA/2
4
10 (Mode 2)
110110
3fDATA
4
11 (Mode 3)
111111
3fDATA1
7fDATA/2
2
00 (Mode 0)
Bypass
DC
0
2
01 (Mode 1)
Bypass
fDATA/2
2
10 (Mode 2)
Bypass
fDATA
2
11 (Mode 3)
Bypass
fDATA1
3fDATA/2
1
When HB1 Mode 1 or Mode 3 is used, enabling premodulation provides an additional frequency translation of the input signal by fDATA/2, which centers a baseband
input signal in the filter pass band.
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