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參數(shù)資料
| 型號： | LTC1069-7IS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FILTR 8TH ORDER LOWPASS 8SOIC |
| 標準包裝： | 2,500 |
| 濾波器類型： | 線性相位，低通開關(guān)電容器 |
| 頻率 - 截止或中心： | 200kHz |
| 濾波器數(shù)： | 1 |
| 濾波器階數(shù)： | 8th |
| 電源電壓： | ±5V，5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
LTC1069-7
8
10697fa
Wideband Noise
The wideband noise of the lter is the total RMS value
of the device’s noise spectral density and determines the
operating signal-to-noise ratio. Most of the wideband
noise frequency contents lie within the lter passband.
The wideband noise cannot be reduced by adding post
ltering. The total wideband noise is nearly independent
of the clock frequency and depends slightly on the power
supply voltage (see Table 3). The clock feedthrough
specications are not part of the wideband noise.
Table 3. Wideband Noise
VS
CLOCK FEEDTHROUGH
4.75V
125μVRMS
±5V
140μVRMS
Aliasing
Aliasing is an inherent phenomenon of sampled data
systems and it occurs for input frequencies approaching
the sampling frequency. The internal sampling frequency
of the LTC1069-7 is 50 times its fCUTOFF frequency. For
instance if a 48kHz, 100mVRMS signal is applied at the
APPLICATIONS INFORMATION
input of an LTC1069-7 operating with a 50% duty cycle
25kHz clock, a 2kHz, 741μVRMS alias signal will appear
at the lter output. Table 4 shows details.
Table 4. Aliasing
INPUT FREQUENCY
VIN = 1VRMS
OUTPUT LEVEL
Relative to Input
OUTPUT FREQUENCY
Aliased Frequency
fCLK/fC = 25:1, fCUTOFF = 1kHz
40kHz (or 60kHz)
–59.9dB
10kHz
47kHz (or 53kHz)
–54.2dB
3kHz
48kHz (or 52kHz)
–42.6dB
2kHz
48.5kHz (or 51.5kHz)
–18.3dB
1.5kHz
49kHz (or 52kHz)
–2.9dB
1.0kHz
49.5kHz (or 50.5kHz)
–0.65dB
0.5kHz
Speed Limitations
To avoid op amp slew rate limiting, the signal amplitude
should be kept below a specied level as shown in Table 5.
Table 5. Maximum VIN vs VS and Clock
VS
MAXIMUM CLOCK
MAXIMUM VIN
5V
≥ 2.5MHz
340mVRMS (fIN ≥ 200kHz)
±5V
≥ 4.5MHz
1.2VRMS (fIN ≥ 400kHz)
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