有源滤波器_LTC1064-1CSW#TRPBF_规格书_ADI(亚德诺)_LINEAR(凌特)有源滤波器规格书.PDF
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LTC1064-1
1
10641fa
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
■
8th Order Filter in a 14-Pin Package
■
No External Components
■
100:1 Clock to Center Ratio
■
150µV
RMS
Total Wideband Noise
■
0.03% THD or Better
■
50kHz Maximum Corner Frequency
■
Operates from ±2.37V to ±8V Power Supplies
■
Passband Ripple Guaranteed Over Full Military
Temperature Range
Low Noise, 8th Order, Clock
Sweepable Elliptic Lowpass Filter
The LTC
®
1064-1 is an 8th order, clock sweepable elliptic
(Cauer) lowpass switched capacitor filter. The passband
ripple is typically ±0.15dB, and the stopband attenuation
at 1.5 times the cutoff frequency is 68dB or more.
An external TTL or CMOS clock programs the value of the
filter’s cutoff frequency. The clock to cutoff frequency ratio
is 100:1.
No external components are needed for cutoff frequencies
up to 20kHz. For cutoff frequencies over 20kHz two low
value capacitors are required to maintain passband flatness.
The LTC1064-1 features low wideband noise and low
harmonic distortion even for input voltages up to 3V
RMS
.
In fact the LTC1064-1 overall performance completes with
equivalent multiple op amp RC active realizations.
The LTC1064-1 is available in a 14-pin DIP or 16-pin
surface mounted SW package.
The LTC1064-1 is pin compatible with the LTC1064-2.
, LTC and LT are registered trademarks of Linear Technology Corporation.
8th Order Clock Sweepable Lowpass
Elliptic Antialiasing Filter Frequency Response
V
OUT
/V
IN
(dB)
15
0
–15
–30
–45
–60
–75
–90
–105
FREQUENCY (kHz)
040
1064 TA02
105152535
20
30
8th ORDER CLOCK SWEEPABLE LOWPASS ELLIPTIC ANTIALIASING
FILTER MAINTAINS, FOR 0.1Hz ≤ f
CUTOFF
≤ 10kHz, A ±0.15dB PASSBAND
RIPPLE AND 72dB STOPBAND ATTENUATION AT 1.5 × f
CUTOFF
.
TOTAL WIDEBAND NOISE = 150µV
RMS
, THD = 0.03% FOR V
IN
= 1V
RMS
LTC1064-1
1
2
3
4
5
6
7
14
13
12
11
10
9
8
R(h, I)
COMP2*
V
–
f
CLK
NC
V
OUT
NC
INV C
V
IN
AGND
V
+
AGND
COMP1*
INV A
1064 TA01
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF
CAPACITOR CLOSE TO THE PACKAGE.
FOR SERVO OFFSET NULLING APPLICATIONS, PIN 1 IS THE 2ND
STAGE SUMMING JUNCTION.
*FOR CUTOFF FREQUENCY ABOVE 20kHz, USE COMPENSATION
CAPACITORS (5pF TO 56pF) BETWEEN PIN 13 AND PIN 1
AND PIN 6 AND PIN 7.
CLOCK
(TTL, ≤5MHz)
–8V
8V
V
OUT
V
IN
0.1µF
0.1µF
■
Antialiasing Filters
■
Telecom PCM Filters
14引脚封装中的8阶滤波器
无外部组件
100:1时钟与中心的比例
150µV
RMS
总宽带噪声
0.03% THD或更高
50kHz最大转角频率
工作从±2.37V到±8V电源
通带纹波保证在全军用温度范围
低噪音，8阶，时钟
可扫频椭圆低通滤波器
LTC
®
1064-1 is an 8th order, clock sweepable elliptic (
Cauer)低通开关电容滤波器。通带纹波通常为±0.15d
B，在1.5倍截止频率下的阻带衰减为68dB或更高。
外部TTL或CMOS时钟编程滤波器的截止频率值。时
钟与截止频率比为100:1。
截止频率高达20kHz，不需要外部元件。对于超过20
kHz的截止频率，需要两个低值电容器来保持通带平
坦度。LTC1064-1具有低宽带噪声和低谐波失真的特
点，即使输入电压高达 3V
RMS
。事实上，LTC1064-1
的整体性能完成了等效的多运放RC有源实现。
LTC1064-1提供14引脚DIP或16引脚表面安装SW封装
。
LTC1064-1引脚兼容LTC1064-2。
， LTC和LT是Linear Technology Corporation的注册商标。
8阶可时钟扫频低通椭圆抗混叠滤
波器
频率响应
1064年TA02
当0.1Hz≤ f
CUTOFF
≤10kHz时，8阶可时钟扫频低通椭圆抗混叠滤波器在1
.5 ×f
CUTOFF
时保持±0.15dB通带纹波和72dB阻带衰减。总宽带噪声=
150µV
RMS
，THD = 0.03%，对于 V
IN
=1V
RMS
1064年TA01
注意:电源应通过靠近封装的0.1µf电容器旁路。
对于伺服偏置零应用，引脚1是第二级求和结。*对于20kHz以
上的截止频率，在引脚13和引脚1之间以及引脚6和引脚7之间
使用补偿电容器(5pF到56pF)。
抗锯齿过滤器
电信PCM滤波器
翻译仅供参考，如需更准确的信息，请参考英文版
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