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參數(shù)資料
| 型號： | LTC1066-1 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 14-Bit DC Accurate Clock-Tunable, 8th Order Elliptic or Linear Phase Lowpass Filter(14位直流精度，時鐘可調(diào)，８階橢圓形或線性相位低通濾波器) |
| 中文描述： | 14位直流精確時鐘可調(diào)，8階橢圓型或線性相位低通濾波器（14位直流精度，時鐘可調(diào)，8階橢圓形或線性相位低通濾波器） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 302K |
| 代理商： | LTC1066-1 |
11
LTC1066-1
APPLICATIO
S I
N
FOR
ATIO
U
Transient Response and Settling Time
The LTC1066-1 exhibits two different transient behaviors.
First, during power-up the DC correcting loop will settle
after the voltage offset of the internal switched-capacitor
network is stored across the feedback capacitor C
F
(see
Block Diagram). It takes approximately five time constants
(5R
F
C
F
) for settling to 1%. Second, following DC loop
settling, the filter reaches steady state. The filter transient
response is then defined by the frequency characteristics
of the internal switched-capacitor lowpass filter. Figure 5
shows details.
DC loop settling is also observed if, at steady state, the DC
offset of the internal switched-capacitor network suddenly
changes. A sudden change may occur if the clock fre-
quency is instantaneously stepped to a value above 1MHz.
W
U
INPUT
90%
50%
10%
OUTPUT
tr
td
ts
1066-1 F05
RISE TIME (t
r
)
SETTLING TIME (t
s
)
DELAY TIME (t
d
)
50:1 ELLIPTIC
0.43
f
CUTOFF
3.4
f
CUTOFF
0.709
f
CUTOFF
±5%
±5%
±5%
0.43
f
CUTOFF
2.05
f
CUTOFF
0.556
f
CUTOFF
±5%
±5%
±5%
100:1 LINEAR PHASE
and on the value of the power supplies. With proper layout
techniques the values of the clock feedthrough are shown
on Table 7.
Table 7. Clock Feedthrough
POWER SUPPLY
Single 5V
±
5V
±
7.5V
50:1
100:1
90
μ
V
RMS
200
μ
V
RMS
650
μ
V
RMS
70
μ
V
RMS
100
μ
V
RMS
160
μ
V
RMS
Wideband Noise
The wideband noise of the filter is the total RMS value of
the device’s noise spectral density and is used to deter-
mine the operating signal-to-noise ratio. Most of its fre-
quency contents lie within the filter passband and cannot
be reduced with post filtering. For instance, the LTC1066-
1 wideband noise at
±
5V supply is 100
μ
V
RMS
, 95
μ
V
RMS
of
which have frequency contents from DC up to the filter’s
cutoff frequency. The total wideband noise (
μ
V
RMS
) is
nearly independent of the value of the clock. The clock
feedthrough specifications are not part of the wideband
noise. Table 8 lists the typical wideband noise for each
supply.
Table 8. Wideband Noise
POWER SUPPLY
Single 5V
±
5V
±
7.5V
50:1
100:1 (Pin 8 to GND)
80
μ
V
RMS
85
μ
V
RMS
90
μ
V
RMS
90
μ
V
RMS
100
μ
V
RMS
106
μ
V
RMS
Speed Limitations
To avoid op amp slew rate limiting at maximum clock
frequencies, the signal amplitude should be kept below a
specified level as shown in Table 9.
Table 9. Maximum V
IN
INPUT FREQUENCY
≥
250kHz
≥
700kHz
MAXIMUM V
IN
0.50V
RMS
0.25V
RMS
Clock Feedthrough
Clock feedthrough is defined as the RMS value of the clock
frequency and its harmonics that are present at the filter’s
output pin (9). The clock feedthrough is tested with the
input pin (2) grounded and depends on PC board layout
Figure 5. Transient Response
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| LTC1066-1_09 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit DC Accurate Clock-Tunable, 8th Order Elliptic or Linear Phase Lowpass Filter |
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| LTC1066-1CSW | 功能描述:IC FILTR 8TH ORDR LOWPASS 18SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
| LTC1066-1CSW#PBF | 功能描述:IC FILTR 8TH ORDR LOWPASS 18SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
| LTC1066-1CSW#TR | 功能描述:IC FILTER LP 8TH ORDER 18SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
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