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LTC1061CSW#PBF

更新时间： 2024-01-03 12:28:33
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 352K
描述
LTC1061 - High Performance Triple Universal Filter Building Block; Package: SO; Pins: 20; Temperature Range: 0°C to 70°C

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LTC1061CSW#PBF 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：PLASTIC, SOL-20针数：20
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.63
有源滤波器类型：SWITCHED CAPACITOR FILTER中心频率或截止频率最大范围：35 kHz
中心频率或截止频率最小范围：0.0001 kHzJESD-30 代码：R-PDSO-G20
JESD-609代码：e3长度：12.8 mm
负电源电压最大值（Vsup）：-9 V负电源电压最小值（Vsup）：-2.37 V
功能数量：3端子数量：20
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：250极和零点：2 AND 0
认证状态：Not Qualified响应：UNIVERSAL
座面最大高度：2.65 mm最大供电电压 (Vsup)：9 V
最小供电电压 (Vsup)：2.37 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子面层：MATTE TIN端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED传递特性：RESISTOR PROGRAMMABLE
宽度：7.5 mmBase Number Matches：1

LTC1061CSW#PBF 数据手册

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LTC1061  
W
U
ODES OF OPERATIO  
the textbook Qs and center frequencies normalized to the  
ripple bandwidth are: Q1 = 0.55, fO1 = 0.71, Q2 = 1.03, FO2  
= 0.969, Q3 = 3.4, FO3 = 1.17. The design was done with  
speed in mind. The higher (Q3, FO3) section was in Mode  
1 and placed in the side B of the LTC1061. The remaining  
two center frequencies were then normalized with respect  
to the center frequency of side B; this changes the ratio of  
clock-to-cutoff frequency from 50:1 to 50 × 1.17 = 58.5:1.  
As shown in Figure 9, the maximum cutoff frequency is  
about33kHz.Thetotalwidebandoutputnoiseis220µVRMS  
and the measured output DC offset voltage is 60mV.  
V
≥ ±5V  
S
A
0
–10  
–20  
–30  
–40  
–50  
–60  
–70  
T
= 25°C  
= 1V  
V
IN  
RMS  
f
f
= 2MHz  
CLK  
C
= 40kHz  
f
= 1MHz  
= 20kHz  
CLK  
C
f
10k 20k  
100k 200k  
(Hz)  
1M  
40k  
f
IN  
1061 F06  
Figure 6. Measures Frequency Response of  
the Lowpass Butterworth Filter of Figure 3.  
1
2
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
R12  
R32  
R22  
R31  
R21  
R51  
3
2. Secondary Modes: Mode 1b – It is derived from Mode  
1. In Mode 1b, Figure 7, two additional resistors, R5 and  
R6, are added to attenuate the amount of voltage fed back  
from the lowpass output into the input of the SA (SB)  
switched capacitor summer. This allows the filter clock-  
to-center frequency ratio to be adjusted beyond 50:1 (or  
100:1). Mode 1b still maintains the speed advantages of  
Mode 1. Figure 8 shows the 3 lowpass sections of the  
LTC1061 in cascade resulting in a Chebyshev lowpass  
filter. The side A of the IC is connected in Mode 1b to  
provide the first resonant frequency below the cutoff  
frequency of the filter. The practical ripple, obtained by  
using a non-A version of the LTC1061 and 1% standard  
resistor values, was 0.15dB. For this 6th order lowpass,  
R11  
R61  
4
V
IN  
R13  
5
LTC1061  
6
–
V
V
OUT  
7
R43  
R33  
R23  
8
f
< 2MHz  
CLK  
9
10  
+
V
STANDARD 1% RESISTOR VALUES  
R32 = 36.5k  
R13 = 15.8k  
R33 = 13k  
R11 = 35.7k  
R31 = 11.5k  
R51 = 5.49k  
R12 = 11k  
R61 = 2.87k  
R22 = 11k  
R23 = 10.5  
R43 = 15.8k  
R21 = 12.1k  
LTC1061 F08  
Figure 8. 6th Order Chebyshev, Lowpass Filter Using 3  
Different Modes of Operation for Speed Optimization  
R6  
R3  
R2  
R5  
V
> ±5V  
S
A
0
–10  
–20  
–30  
–40  
–50  
–60  
–70  
T
= 25°C  
V
= 1V  
IN  
RMS  
= 1.9MHz  
N
S
LP  
BP  
f
CLK  
R1  
V
–
+
IN  
–
+
Σ
∫
∫
1061 F07  
f
R3  
R6  
R6  
CLK  
AGND  
f
=
; f = f ; Q =  
O
n
O
100(50) R5 + R6  
R2 R5 + R6  
√
√
f
R2  
R1  
CLK  
2
H
(f → 0) = H  
= –  
R3  
f →  
ON1  
OLP  
ON2  
(
)
10k  
100k  
(Hz)  
1M  
30k  
–R2/R1  
R6/(R5 + R6)  
H
=
; H  
= –  
; (R5//R6) <5k  
OBP  
R1  
f
IN  
1061 F09  
Figure 9. Amplitude Response of the 6th Order  
Chebyshev Lowpass Filter of Figure 8  
Figure 7. Mode 1b: 2nd Order Filter Providing  
Notch, Bandpass, Lowpass  
8
1...567891011...16

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