參數(shù)資料
型號(hào)： AD6654CBC
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 35/88頁(yè)
文件大小： 0K
描述： IC ADC 14BIT W/4CH RSP 256CSPBGA
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 14
采樣率（每秒）： 92.16M
數(shù)據(jù)接口： 串行，并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 2.5W
電壓電源： 模擬和數(shù)字
工作溫度： -25°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 256-BGA，CSPBGA
供應(yīng)商設(shè)備封裝： 256-CSPBGA（17x17）
包裝： 托盤
輸入數(shù)目和類型： 1 個(gè)差分，單極
AD6654
Rev. 0 | Page 40 of 88
control register bypasses this fixed coefficient HB filter. The
filter is useful only in certain filter configurations and bypassing
it for other applications results in power savings. For example,
the filter is useful in narrow-band applications in which more
filtering is required, as compared to wide-band applications, in
which a higher output rate might prohibit the use of a decimat-
ing filter. The response of the HB2 filter is shown in Figure 52.
05156-041
FRACTION OF HB2 INPUT SAMPLE RATE
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
dBc
0.01
–19.99
–29.99
–9.99
–39.99
–49.99
–60.00
–70.00
–80.00
–90.00
–100.00
–110.00
–120.00
–65
0.66
0.34
HB2 RESPONSE
Figure 52. HB2 Filter Response to the Input Rate of the Filter
The filter input sample rate is the same as the FIR2 filter output
rate and is given by one of the following equations:
fHB2 = fFIR2 = fHB1,
if HB1 is bypassed
fHB2 = fFIR2 =
2
HB1
f
,
if HB1 is not bypassed
where:
fFIR2
is the input rate of the FIR2 filter.
fHB2
is the input rate of the HB2 filter.
The input to the filter has a maximum of 75 MHz. The
maximum output rate when not bypassed is 37.5 MHz.
The filter has a ripple of 0.00075 dB and rejection of 81 dB. For
an alias rejection of 81 dB, the alias-protected bandwidth is 33%
of the filter input sample rate. The bandwidth of the filter for a
ripple of 0.00075 dB is the same as alias-protected bandwidth,
due to the nature of half-band filters. The 3 dB bandwidth of
this filter is 47% of the filter input sample rate. For example, if
the sample rate into the filter is 25 MHz, then the alias-
protected bandwidth of the HB2 filter is 8.25 MHz (33% of
25 MHz). If the bandwidth of the required carrier is greater
than 8.25 MHz, then HB2 might not be useful.
05156-042
FRACTION OF HB2 INPUT SAMPLE RATE
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
dBc
0.01
–19.99
–29.99
–9.99
–39.99
–49.99
–60.00
–70.00
–80.00
–90.00
–100.00
–110.00
–120.00
–90
0.66
0.34
FIR2 + HB2
RESPONSE
Figure 53. Composite Response of FIR2 and HB2 Filters to Their Input Rates
fHB1
is the input rate of the HB1 filter.
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