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LTC1566-1 Datasheet(PDF) 8 Page - Linear Technology

Part # LTC1566-1
Description  1.4nV/?숰z 180MHz Filter Building Block
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1566-1 Datasheet(HTML) 8 Page - Linear Technology

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LT1567
8
1567fa
Functional Description
The LT1567 contains two low noise rail-to-rail output,
wideband operational amplifiers, one of them connected
internally as a unity-gain inverter. These two amplifiers
can form a second order multiple feedback filter configu-
ration (Figure 1) for megahertz signal frequencies, with
exceptionally low total noise. The amplifier in the dedi-
cated inverter (INV) is optimized for better high fre-
quency linearity while the uncommitted operational
amplifier (OA) is optimized for lower input noise voltage,
addressing the different sensitivities to these effects
when used as a filter section. This combination produces
a low noise filter with better distortion performance than
would be possible with identical amplifiers.
LT1567 Free Design Software
A spreadsheet-based design tool is available at
www.linear.com for designing lowpass and bandpass
filters using the LT1567.
APPLICATIO S I FOR ATIO
FREQUENCY (Hz)
100k
–30
GAIN IS MEASURED TO EITHER OUTPUT ALONE.
IF OUTPUT USED DIFFERENTIALLY, VOUT
+ – V
OUT
– = 2× VIN
–21
–15
–9
0
1M
10M
1567 F01b
–27
–18
–12
–3
3
–6
–24
CHEBYSHEV
BUTTERWORTH
fO =
TRANSFER FUNCTION H(s) =
Q =
GAIN + 1
1
2
π√R2R3 C2
R2
R3
(2
πfO)2
(2
πfO)
Q
s2 +
s + (2
πfO)2
Figure 1. 2nd Order Lowpass Filter and Gain Response for fC = 1MHz
(Butterworth: C1 = C2 = 390pF, R1 = R2 = 576
Ω, R3 = 280Ω
Chebyshev: C1 = C2 = 390pF, R1 = R2 = 453
Ω, R3 = 174Ω)
Gain vs Frequency
–
+
7
VOUT
+
1567 F01a
VOUT
–
DESIGN EQUATIONS:
R1 = R2, C1 = C2, C1
≤
6
600
Ω
600
Ω
2
1
C1
3
5
8
VIN
LT1567
0.1
µF
7pF
C2
R3
150
Ω
V+
V+
R1
R2
0.1
µF
1
1000 • fC
R2
R1
BUTTERWORTH R2 =
1
4.44 • C1 • fC
R2
2
R3 =
CHEBYSHEV 0.25dB RIPPLE R2 =
1
5.65 • C1 • fC
R2
2.62
R3 =
4
V–
V–
0.1
µF
fC IS THE FILTER’S CUTOFF FREQUENCY
GAIN = 1 AND fC ≤ 1MHz
()
GAIN =


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