+ Σ AGND 1/4 LTC1064 NS – R1 R2 V
參數(shù)資料
型號(hào)： LTC1064CSW#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 19/20頁(yè)
文件大?。?/td> 0K
描述： IC FILTR BUILDNG BLK QUAD 24SOIC
標(biāo)準(zhǔn)包裝： 1,000
濾波器類型： 通用開關(guān)電容器
頻率 - 截止或中心： 140kHz
濾波器數(shù)： 4
濾波器階數(shù)： 8th
電源電壓： ±2.37 V ~ 8 V
安裝類型： 表面貼裝
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 24-SOIC
包裝： 帶卷 (TR)
LTC1064
8
1064fb
–
+
∫
LP
1064 F05
+ Σ
AGND
1/4 LTC1064
NS
–
R1
R2
VIN
R3
fO =
; fn = fO; HOLP = –
; HOBP = –
; HON1 = –
; Q =
fCLK
100(50)
R2
R1
R3
R1
R3
R2
R1
BP
C2
0.1
F
C1
0.1
F
R1
1M
R2
1M
1064 F04
TO FILTER
FIRST SUMMING
NODE
C1 = C2 = LOW LEAKAGE FILM
(I.E., POLYPROPYLENE)
R1 = R2 = METAL FILM 1%
FROM
FILTER OUTPUT
R3
100k
–
+
LT1012
7
19
R21
R11
R31
4
7
LTC1064
0.1
F
1
F
VOUT
1064 F03
10k
R32
R22
R12
0.1
F
V+ TRACE FOR FILTER
0.1
F
VIN
–
+
10k
LT
318
LT1007
LT1056
NEGATIVE
SUPPLY
POSITIVE
SUPPLY
SEPARATE V+ POWER SUPPLY TRACE FOR BUFFER
1
F
0.1
F
+
APPLICATIONS INFORMATION
WU
U
Offset Nulling
Lowpass filters may have too much DC offset for some
users. A servo circuit may be used to actively null the
offsets of the LTC1064 or any LTC switched-capacitor
filter. The circuit shown in Figure 4 will null offsets to better
than 300
V. This circuit takes seconds to settle because of
the integrator pole frequency.
Noise
All the noise performance mentioned excludes the clock
feedthrough. Noise measurements will degrade if the
already described grounding bypassing and buffering
techniques are not practiced. The graph Wideband Noise
vs Q in the Typical Performance Characteristics section is
a very good representation of the noise performance of
this device.
Figure 3. Buffering the Output of a 4th Order Bandpass Realization
Figure 4. Servo Amplifier
PRIMARY MODES
Mode 1
In Mode 1, the ratio of the external clock frequency to the
center frequency of each 2nd order section is internally
fixed at 50:1 or 100:1. Figure 5 illustrates Mode 1 provid-
ing 2nd order notch, lowpass and bandpass outputs.
Mode 1 can be used to make high order Butterworth
lowpass filters; it can also be used to make low Q notches
and for cascading 2nd order bandpass functions tuned at
the same center frequency with unity gain. Mode 1 is faster
than Mode 3. Note that Mode 1 can only be implemented
with three of the four LTC1064 sections because Section
D has no externally available summing node. Section D,
however, can be internally connected in Mode 1 upon
special request.
ODES OF OPERATIO
U
W
Figure 5. Mode 1: 2nd Order Filter Providing Notch,
Bandpass and Lowpass
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