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参数资料
| 型号： | LTC1164-7CSW#TR |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LP 8TH ORDER 16SOIC |
| 标准包装： | 1,000 |
| 滤波器类型： | 线性相位，低通开关电容器 |
| 频率 - 截止或中心： | 100kHz |
| 滤波器数： | 1 |
| 滤波器阶数： | 8th |
| 电源电压： | 4.75 V ~ 16 V，±2.375 V ~ 8 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
11
LTC1164-7
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Table 8. Clock Feedthrough
VS
50:1
100:1
Single 5V
70
VRMS
70
VRMS
±5V
100
VRMS
200
VRMS
±7.5V
120
VRMS
500
VRMS
Note: The clock feedthrough at Single 5V is imbedded in the wideband
noise of the filter. The clock waveform is a square wave.
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 it depends on PC board layout
and on the value of the power supplies. With proper layout
techniques the values of the clock feedthrough are shown
in Table 8.
Any parasitic switching transients during the rise and fall
edges of the incoming clock are not part of the clock
feedthrough specifications. Switching transients have fre-
quency contents much higher than the applied clock; their
amplitude strongly depends on scope probing techniques
as well as grounding and power supply bypassing. The
clock feedthrough, if bothersome, can be greatly reduced
by adding a simple R/C lowpass network at the output of
the filter pin (9). This R/C will completely eliminate any
switching transients.
Wideband Noise
The wideband noise of the filter is the total RMS value of
the device’s noise spectral density and it is used to
determine the operating signal-to-noise ratio. Most of its
frequency contents lie within the filter’s passband and
cannot be reduced with post filtering. For instance, the
LTC1164-7 wideband noise at
±5V supply is 105VRMS,
95
VRMS of which have frequency contents from DC up to
the filter’s cutoff frequency. The total wideband noise
(
VRMS) is nearly independent of the value of the clock.
The clock feedthrough specifications are not part of the
wideband noise.
Speed Limitations
The LT1164-7 optimizes AC performance vs power con-
sumption. 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 VIN vs VS and Clock
POWER SUPPLY
MAXIMUM fCLK
MAXIMUM VIN
±7.5V
1MHz
2.0VRMS (fIN > 20kHz)
0.7VRMS (fIN > 250kHz)
±5V
1MHz
1.4VRMS (fIN > 20kHz)
0.5VRMS (fIN > 100kHz)
Single 5V
1MHz
0.5VRMS (fIN > 100kHz)
Table 10. Transient Response of LTC Lowpass Filters
DELAY
RISE
SETTLING OVER-
TIME*
TIME**
TIME***
SHOOT
LOWPASS FILTER
(SEC)
(%)
LTC1064-3 Bessel
0.50/fC
0.34/fC
0.80/fC
0.5
LTC1164-5 Bessel
0.43/fC
0.34/fC
0.85/fC
0
LTC1164-6 Bessel
0.43/fC
0.34/fC
1.15/fC
1
LTC1264-7 Linear Phase
1.15/fC
0.36/fC
2.05/fC
5
LTC1164-7 Linear Phase
1.20/fC
0.39/fC
2.20/fC
5
LTC1064-7 Linear Phase
1.20/fC
0.39/fC
2.20/fC
5
LTC1164-5 Butterworth
0.80/fC
0.48/fC
2.40/fC
11
LTC1164-6 Elliptic
0.85/fC
0.54/fC
4.30/fC
18
LTC1064-4 Elliptic
0.90/fC
0.54/fC
4.50/fC
20
LTC1064-1 Elliptic
0.85/fC
0.54/fC
6.50/fC
20
* To 50%
±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%
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