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參數資料
| 型號： | LTC1569C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Linear Phase, DC Accurate, Tunable, 10th Order Lowpass Filter |
| 中文描述： | 線性相位，直流準確，可調諧，第10階低通濾波器 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 217K |
| 代理商： | LTC1569C |
9
LTC1569-6
APPLICATIO
S I
N
FOR
ATIO
U
W
U
used. The filter IC should be soldered to the PC board. The
power supplies should be well decoupled including a 1
μ
F
ceramic capacitor from V
+
(Pin 7) to V
–
(Pin 4). A ground
plane should be used. Noisy signals should be isolated
from the filter input pins.
When the power supply is 3V, the output DC offset should
change less than
±
2mV when the clock frequency varies
from 64kHz to 4096kHz. When the clock frequency is
fixed, the output DC offset will typically change by less
than
±
3mV (
±
15mV) when the power supply varies from
3V to 5V (
±
5V) in the divide-by-1 mode. In the divide-by-
4 or divide-by-16 modes, the output DC offset will typically
change less than –9mV (–27mV) when the power supply
varies from 3V to 5V (
±
5V). The offset is measured with
respect to GND (Pin 3).
Aliasing
Aliasing is an inherent phenomenon of sampled data
filters. In lowpass filters significant aliasing only occurs
when the frequency of the input signal approaches the
sampling frequency or multiples of the sampling fre-
quency. The LTC1569-6 samples the input signal twice
every clock period. Therefore, the sampling frequency is
twice the clock frequency and 128 times the filter cutoff
frequency. Input signals with frequencies near 2 f
CLK
±
f
CUTOFF
will be aliased to the passband of the filter and
appear at the output unattenuated.
Table 4. Clock Feedthrough
Power Supply
3V
5V
±
5V
Feedthrough
0.1mV
RMS
0.3mV
RMS
0.9mV
RMS
DC Accuracy
DC accuracy is defined as the error in the output voltage
after DC offset and DC gain errors are removed. This is
similar to the definition of the integral nonlinearity in A/D
converters. For example, after measuring values of V
OUT(DC)
vs V
IN(DC)
for a typical LTC1569-6, a linear regression
shows that V
OUT(DC)
= V
IN(DC)
0.99854 + 0.00134V is the
straight line that best fits the data. The DC accuracy
describes how much the actual data deviates from this
straight line (i.e., DCERROR = V
OUT(DC)
– (V
IN(DC)
0.99854
+ 0.00134V). In a 12-bit system with a full-scale value of
2V, the LSB is 488
μ
V. Therefore, if the DCERROR of the
filter is less than 488
μ
V over a 2V range, the filter has
12-bit DC accuracy. Figure 9 illustrates the typical DC
accuracy of the LTC1569-6 on a single 5V supply.
DC Offset
The output DC offset of the LTC1569-6 is trimmed to less
than
±
5mV. The trimming is performed with V
S
= 1.9V,
–1.1V with the filter cutoff frequency set to 4kHz (R
EXT
=
10k, DIV/CLK shorted to V
+
). To obtain optimum DC offset
performance, appropriate PC layout techniques should be
V
IN
DC (V)
–1.5
–1.0
–0.5
0
0.5
1.0
1.5
1569-6 F09
488
244
0
–244
–488
V
S
= 5V
R
EXT
= 10k
T
A
= 25
°
C
D
μ
V
Figure 9
8
3
1
2
OUT
IN
–
IN
+
GND
1569-6 F06
–
+
125k
+
–
–
+
125k
i = IN
+
– GND
125k
Figure 8
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1569CS8-6 | 功能描述:IC FILTER 10TH ORDR LOWPASS8SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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:4 濾波器階數: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） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) |
| LTC1569CS8-6#PBF | 功能描述:IC FILTER 10TH ORDR LOWPASS8SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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:4 濾波器階數: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） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) |
| LTC1569CS8-6#PBF | 制造商:Linear Technology 功能描述:IC FILTER LOW PASS 64KHZ 8-SOIC 制造商:Linear Technology 功能描述:IC, FILTER, LOW PASS, 64KHZ, 8-SOIC |
| LTC1569CS8-6#TR | 功能描述:IC FILTER LP 10TH ORD LIN 8SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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:4 濾波器階數: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） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) |
| LTC1569CS8-6#TRPBF | 功能描述:IC FILTER 10TH ORDR LOWPASS8SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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:4 濾波器階數: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） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) |
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