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PDF LTC1164 Data sheet ( Hoja de datos )
| Número de pieza | LTC1164 | |
| Descripción | Low Power/ Low Noise/ Quad Universal Filter Building Block | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1164
Low Power, Low Noise, Quad
Universal Filter Building Block
FEATURES
■ Low Power
■ 4 Filters in a 0.3" Wide Package
■ 1/2 the Noise of the LTC1059, 60, 61 Devices
■ Wide Output Swing
■ Clock-to-Center Frequency Ratios of 50:1 and 100:1
■ Operates from ±2.37V to ±8V Power Supplies
■ Customized Version with Internal Resistors Available
■ Ratio of 50:1 and 100:1 Simultaneously Available
U
APPLICATIO S
■ Antialiasing Filters
■ Telecom Filters
■ Spectral Analysis
■ Loop Filters
■ For Fixed Lowpass Filter Requirements use the
LTC1164-XX Series
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS trademark of Linear Technology Corporation.
DESCRIPTIO
The LTC®1164 consists of four low power, low noise
2nd order switched capacitor filter building blocks. Each
building block typically consumes 850µA supply current.
Low power is achieved without sacrificing noise and
distortion. Each building block, together with 3 to 5
resistors, can provide 2nd order functions like lowpass,
highpass, bandpass, and notch. The center frequency of
each 2nd order section can be tuned with an external clock,
or a clock and resistor ratio. For Q < 5, the center frequency
range is from 0.1Hz to 20kHz. Up to 8th order filters can
be realized by cascading all four 2nd order sections. Any
classical filter realization (such as Butterworth, Cauer,
Bessel, and Chebyshev) can be formed.
A customized monolithic version of the LTC1164
including internal thin film resistors can be obtained.
Consult LTC Marketing for details.
The LTC1164 is manufactured using Linear Technology’s
enhanced LTCMOS™ silicon gate process.
TYPICAL APPLICATIO
Dual 5th Order Linear Phase Filter with Stopband Notch
549k
63.4k
210k
VIN1
102k
133k
174k
1
2
3
4
24
23 49.9k
22 36.5k
21 78.7k
8.66k
5 20
6 LTC1164 19
V+
0.1µF
7 18 fCLK
8 17 8.66k
210k
VIN2
174k 9
133k 10
102k 11
12
C1 = 0.0033µF
C2 = 0.0068µF
fCLK = 500kHz
WIDEBAND NOISE = 50µVRMS
TOTAL SUPPLY CURRENT = 3mA
ALL RESISTORS ARE 1% METAL FILM
16 78.7k
15 36.5k
14 49.9k
13
63.4k
549k
VOUT1
C1
V–
0.1µF
VOUT2
C2
LTC1164 • TA01
Dual 5th Order Linear Phase Filter with
Stopband Notch, fCLK = 500kHz
10.00
0.0
– 10.00
– 20.00
– 30.00
VOUT2
VOUT1
– 40.00
– 50.00
– 60.00
– 70.00
– 80.00
– 90.00
1k
10k
FREQUENCY (Hz)
100k
LTC1164 • TA02
SUPPLY
VOLTAGE
±2.5
±5.0
±7.5
VIN
1VRMS
2VRMS
4VRMS
TOTAL
HARMONIC DISTORTION
0.015% (–76dB)
0.025% (–72dB)
0.04% (–68dB)
SIGNAL/NOIS E
86dB
92dB
98dB
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1
1 page  
BLOCK DIAGRA
LTC1164
INV A(12)
AGND(6)
INV B(1)
INV C(24)
INV D(13)
HPA/NA(11)
BPA(10)
LPA(9)
–
+Σ
+∫
+∫
+–
HPB/NB(2) SA(8)
BPB(3)
LPB(4)
–
+Σ
+∫
+∫
+–
V +(7)
50/100(17)
CLK(18)
V –(19)
HPC/NC(23)
SB(5)
BPC(22) LPC(21)
–
+Σ
+∫
+∫
+–
HPD(14)
SC(20)
BPD(15) LPD(16)
BY TYING PIN 17 TO V + ALL SECTIONS
OPERATE WITH (fCLK/fO) = (50:1)
– BY TYING PIN 17 TO V– ALL SECTIONS
+∫ +∫
OPERATE WITH (fCLK/fO) = (100:1)
BY TYING PIN 17 TO AGND SECTIONS A & D
+ OPERATE WITH (fCLK/fO) = (100:1) AND
SECTIONS B & C OPERATE AT (50:1)
LTC1164 • BD02
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5
5 Page 
U
ODES OF OPERATIO
Mode 3A
This is an extension of Mode 3 where the highpass and
lowpass output are summed through two external resis-
tors RH and RL to create a notch. This is shown in Figure
10. Mode 3A is more versatile than Mode 2 because the
notch frequency can be higher or lower than the center
frequency of the 2nd order section. The external op amp of
Figure 10 is not always required. When cascading the
sections of the LTC1164, the highpass and lowpass
LTC1164
outputs can be summed directly into the inverting input of
the next section. The topology of Mode 3A is useful for
elliptic highpass and notch filters with clock to cutoff
frequency ratios higher than 100:1. This is often required
to extend the allowed input signal frequency range and to
avoid premature aliasing.
When the internal clock-to-center frequency ratio is set at
50:1, the design equations for Q and bandpass gain are
different from the 100:1 case.
R1
VIN
R4
R3
R2
–
+
NS
+–
Σ∫
1/4 LTC1164
MODE 2 (100:1):
fo
=
fCLK
100
1 + R2
R4
;
fn
=
fCLK
50
;Q=
R3
R2
1
+ R2
R4
;
HOLP
=
1
– R2/R1
+ (R2/R4)
( )HOBP =
–R3/R1; HON1 (f →
0)
=
1
– R2/R1
+ (R2/R4)
;
HON2
f
→
fCLK
2
= – R2/R1
BP
LP MODE 2 (50:1):
fo
=
fCLK
50
1 + R2
R4
;
fn
=
fCLK
50
;Q=
1.005 (√1 + R2/R4)
(R2/R3) – (R2/16R4)
;
HOLP
=
– R2/R1
1 + (R2/R4)
( )∫
HOBP
=
–
1
–
(RR33//R116R4);
HON1(f
→
0)
=
1
– R2/R1
+ (R2/R4)
HON2
f
→
fCLK
2
= – R2/R1
NOTE: THE 50:1 EQUATIONS FOR MODE 2 ARE DIFFERENT FROM THE EQUATIONS
FOR MODE 2 OPERATION OF THE LTC1059, LTC1060 AND LTC1061. START WITH
fo, CALCULATE R2/R4, SET R4; FROM THE Q VALUE, CALCULATE R3:
R3 = 1.005
Q
R2 ; THEN CALCULATE R1 TO SET THE DESIRED GAIN
1 + R2 + R2
R4 16R4
LTC1164 • MOO04
Figure 9. Mode 2: 2nd Order Filter Providing Notch, Bandpass, Lowpass
R1
VIN
R4
R3
R2
–
+
AGND
CC
HP S
+–
Σ∫
BP
∫
1/4 LTC1164
RH
MODE 3A (100:1):
fo
=
fCLK
100
R2
R4
;
fn
=
fCLK
100
RRHL ; HOHP = – R2/R1; HOBP = – R3/R1
( )HOLP
=
– R4/R1; HON1(f
→
0)
=
RG
RL
×
R4;
R1
HON2
f → fCLK
2
=
RG
RH
×
R2
R1
( )HON (f = fo) = Q
RG
RL
HOLP
–
RG
RH
HOHP
;
Q
=
R3
R2
R2
R4
( )LP
MODE 3A (50:1):
fo
=
fCLK
50
R2
R4
;
fn
=
fCLK
50
RH ;
RL
HOHP
f → fCLK
2
= –R2/R1
HOBP = –
1 – (RR33//R116R4); HOLP(f = 0) = – R4/R1; Q =
1.005 (√R2/R4)
(R2/R3) – (R2/16R4)
RG
RL –
NOTE: THE 50:1 EQUATIONS FOR MODE 3A ARE DIFFERENT FROM THE EQUATIONS
FOR MODE 3A OPERATION OF THE LTC1059, LTC1060 AND LTC1061. START WITH
fo, CALCULATE R2/R4, SET R4; FROM THE Q VALUE, CALCULATE R3:
R3 = 1.005
NOTCH Q
R2 ; THEN CALCULATE R1 TO SET
R2 + R2 THE DESIRED GAIN
R4 16R4
+
EXTERNAL OP AMP OR
INPUT OP AMP OF THE
LTC1164, SIDE A, B, C, D
LTC1164 • MOO05
Figure 10. Mode 3A: 2nd Order Filter Providing Highpass, Bandpass, Lowpass, Notch
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1164.PDF ] | |
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