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參數(shù)資料
| 型號(hào)： | LTC1066-1CSW#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FILTR 8TH ORDR LOWPASS 18SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 濾波器類型： | 貝塞爾，低通開關(guān)電容器 |
| 頻率 - 截止或中心： | 50kHz |
| 濾波器數(shù)： | 1 |
| 濾波器階數(shù)： | 8th |
| 電源電壓： | 4.75 V ~ 16 V，±2.375 V ~ 8 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 18-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 18-SOIC |
| 包裝： | 帶卷 (TR) |
LTC1066-1
11
10661fa
APPLICATIONS INFORMATION
WU
U
AC PERFORMANCE
AC (Passband) Gain
The passband gain of the LTC1066-1 is equal to the
passband gain of the internal switched-capacitor lowpass
filter, and it is measured at f = 0.25fCUTOFF. Unlike conven-
tional monolithic filters, the LTC1066-1 starts with an
absolutely perfect 0dB DC gain and phases into an “imper-
fect” AC passband gain, typically
±0.1dB.
The filter’s low passband ripple, typically 0.05dB, is mea-
sured with respect to the AC passband gain.
The LTC1066-1 DC stabilizing loop slightly warps the
filter’s passband performance if the – 3dB frequency of the
feedback passive elements (1/2
πRFCF) is more than the
Figure 4. Passband Behavior
FREQUENCY (Hz)
10
GAIN
(dB)
100
1k
10k 20k
1066-1 F04
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
TA = 25°C
fCLK/fC = 50:1
RF = 20k,
CF = 1F
CURVE D: fCUTOFF = 20kHz = 2500 × 2πR
FCF
1
CURVE C: fCUTOFF = 5kHz = 625 × 2πR
FCF
1
CURVE B: fCUTOFF = 2kHz = 250 ×
2
πRFCF
1
CURVE A: fCUTOFF = 1kHz = 125 × 2πR
FCF
1
A
B
CD
cutoff frequency of the internal switched-capacitor filter
divided by 250. The LTC1066-1 clock tunability directly
relates to the above constraint. Figure 4 illustrates the
passband behavior of the LTC1066-1 and it demonstrates
the clock tunability of the device. A typical LTC1066-1
device was used to trace all four curves of Figure 4. Curve
D, for instance, has nearly zero ripple and 0.04dB passband
gain. Curve D’s 20kHz cutoff is much higher than the 8Hz
cutoff frequency of the RFCF feedback network, so its
passband is free from any additional error due to RFCF
feedback elements. Curve B illustrates the passband error
when the 1MHz clock of curve D is lowered to 100kHz. A
0.1dB error is added to the filter’s original AC gain of
0.04dB.
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