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參數(shù)資料
| 型號： | LTC1060CSW#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/20頁 |
| 文件大小： | 0K |
| 描述： | IC FILTER BUILDING BLOCK 20-SOIC |
| 標(biāo)準(zhǔn)包裝： | 38 |
| 濾波器類型： | 通用開關(guān)電容器 |
| 頻率 - 截止或中心： | 30kHz |
| 濾波器數(shù)： | 2 |
| 濾波器階數(shù)： | 4th |
| 電源電壓： | ±2.37 V ~ 5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1324 (CN2011-ZH PDF) |
18
LTC1060
1060fb
Figure 22. Combining Mode 3 with Mode 2b to Create a 4th
Order BR Elliptic Filter with 1dB Ripple and a Ratio of 0dB to
Stop Bandwidth Equal to 9/1.
Figure 23. Amplitude Response of the Notch Filter of Figure 22
Switched capacitor integrators generally exhibit higher
input offsets than discrete R, C integrators. These offsets
are mainly due to the charge injection of the CMOS
switches into the integrating capacitors and they are
temperature independent.
The internal op amp offsets also add to the overall offset
budget and they are typically a couple of millivolts. Be-
cause of this, the DC output offsets of switched capacitor
filters are usually higher than the offsets of discrete active
filters.
Figure 24 shows half of an LTC1060 filter building block
with its equivalent input offsets VOS1, VOS2, VOS3. All three
are 100% tested for both sides of the LTC1060. VOS2 is
generally the larger offset. When the SA/B, Pin 6, of the
LTC1060 is shorted to the negative supply (i.e., mode 3),
the value of the VOS2 decreases. Additionally, with SA/B
low, a 20% to 30% noise reduction is observed. Mode 1
can still be achieved, if desired, by shorting the S1 pin to
the lowpass output (Figure 25).
LTC1060 CM04
VIN
R31
R21
R52
R32
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V+ = – 5V
–5V
VOUT
T2L OR CMOS
CLOCK IN
R41
RL1
RH1
R22
R62
R42
LPA
BPA
HPA
INVA
S1A
SA/B
VA
+
VD
+
LSh
CLKA
LPB
BPB
NB
INVB
S1B
AGND
VA
–
VD
–
50/100
CLKB
LTC1060
R11
RESISTOR VALUES
R11 = 60k
R41 = 28.84k
R52 = 5k
R32 = 455.75k
R21 = 5k
RH1 = 5k
R62 = 1.59k
R42 = 503.85k
R31 = 54.75k
RL1 = 19.3k
R22 = 60k
V– = – 5V
0.7
–30
–20
–10
0
1.1
1.2
1.3
–60
–50
–40
0.9
0.8
f0 = 1.0
V
OUT
/V
IN
(dB)
INPUT FREQUENCY NORMALIZED TO FILTER CENTER FREQUENCY
TLC1060 CMO05
fCLK
f0
200
1
=; fCLK ≤ 1MHz
+
(17)
4
++
–
+
(18)
(16)
(19)
(20)
15
VOS1
VOS2
3
5
Σ
TLC1060 LO01
1
2
–
+
–
+
–
VOS3
Figure 24. Equivalent Input Offsets of 1/2 LTC1060 Filter
Building Block
Figure 25. Mode 1(LN): Same Operation as Mode 1 but Lower
VOS2 Offset and Lower Noise
LTC1060 OFFSETS
COMM E TS ON THE M ODES OF OPERATIO
U
W
U
1/2 LTC1060
SA/B
VIN
1
+
–
+
R3
R2
R1
N
(18)
LP
(20)
BP
(19)
S1A
(16)
V –
(17)
15
4
3
5
2
Σ
6
TLC1060 LO02
∫
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