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參數(shù)資料
| 型號： | AD6654CBCZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 32/88頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT W/4CH RSP 256CSPBGA |
| 標準包裝： | 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 |
| 供應商設備封裝： | 256-CSPBGA（17x17） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 1 個差分，單極 |
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AD6654
Rev. 0 | Page 38 of 88
FIR HALF-BAND BLOCK
The output of the CIC filter is pipelined into the FIR HB (half-
band) block. Each channel has two sets of cascading fixed
coefficient FIR and fixed coefficient half-band filters. The half-
band filters decimate by 2. Each of these filters (FIR1, HB1,
FIR2, and HB2) is described in the following sections.
3-TAP FIXED COEFFICIENT FILTER (FIR1)
The 3-tap FIR filter is useful in certain filter configurations in
which extra alias protection is needed for the decimating HB1
filter. It is a simple sum-of-products FIR filter with three filter
taps and 2-bit fixed coefficients. Note that this filter does not
decimate. The coefficients of this symmetric filter are {1, 2, 1}.
The normalized coefficients used in the implementation are
{0.25, 0.5, 0.25}.
The user can either use or bypass this filter. Writing Logic 0 to
the FIR1 enable bit in the FIR-HB control register bypasses this
fixed coefficient filter. The filter is useful only in certain filter
configurations and bypassing it for other applications results in
power savings.
05156-037
FRACTION OF FIR1 INPUT SAMPLE RATE
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
dBc
0
–16.67
–8.33
–33.33
–25.00
–50.00
–41.67
–66.67
–58.33
–83.33
–75.00
–100.00
–91.67
0.34
0.66
–81
FIR1 RESPONSE
Figure 48. FIR1 Filter Response to the Input Rate of the Filter
This filter runs at the same sample rate as the CIC filter output
rate and is given by
CIC
IN
FIR1
M
f
=
where:
fIN
is the input rate to the channel.
MCIC
is the decimation ratio in the CIC filter stage.
The maximum input and output rates for this filter are
150 MHz.
DECIMATE-BY-2 HALF-BAND FILTER (HB1)
The next stage of the FIR-HB block is a decimate-by-2 half-
band filter. The 11-tap, symmetrical, fixed coefficient HB1 filter
has low power consumption due to its polyphase implementa-
tion. The filter has 22 bits of input and output data with 10-bit
coefficients. Table 16 lists the coefficients of the half-band filter.
The normalized coefficients used in the implementation and
the 10-bit decimal equivalent value of the coefficients are also
listed. Other coefficients are 0s.
Table 16. Fixed Coefficients for HB1 Filter
Coefficient
Number
Normalized
Coefficient
Decimal Coefficient
(10-Bit)
C1, C11
0.013671875
7
C3, C9
0.103515625
53
C5, C7
0.58984375
302
C6
1
512
Similar to the FIR1 filter, this filter can be used or bypassed.
Writing Logic 0 to the HB1 enable bit in the FIR-HB 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, it is
useful in narrow-band and wideband output applications in
which more filtering is required, as compared to very wide
bandwidth applications in which a higher output rate might
prohibit the use of a decimating filter. The response of the filter
is shown in Figure 49.
The input sample rate of this filter is the same as the CIC filter
output rate and is given by
CIC
IN
HB1
M
f
=
where:
fIN
is the input rate to the channel.
MCIC
is the decimation ratio in the CIC filter stage.
05156-038
FRACTION OF HB1 INPUT SAMPLE RATE
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
dBc
0
–20
–10
–40
–30
–60
–50
–80
–70
–110
–100
–90
–120
HB1 RESPONSE
0.43
0.57
–77
Figure 49. HB1 Filter Response to the Input Rate of the Filter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD6654XBCZ | 制造商:Analog Devices 功能描述:14-BIT, 92.16 MSPS, 4 & 6-CHANNEL WIDEBAND IF TO BASE BAND R - Bulk |
| AD6655 | 制造商:AD 制造商全稱:Analog Devices 功能描述:IF Diversity Receiver |
| AD6655-125EBZ | 功能描述:BOARD EVAL W/AD6655 & SOFTWARE RoHS:是 類別:RF/IF 和 RFID >> RF 評估和開發(fā)套件，板 系列:- 標準包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796 |
| AD6655-125EBZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:IF Diversity Receiver |
| AD6655-150EBZ | 功能描述:BOARD EVAL FOR 150MSPS AD6655 RoHS:是 類別:RF/IF 和 RFID >> RF 評估和開發(fā)套件，板 系列:- 標準包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796 |
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