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PDF LTC1067CGN Data sheet ( Hoja de datos )
| Número de pieza | LTC1067CGN | |
| Descripción | Rail-to-Rail/ Very Low Noise Universal Dual Filter Building Block | |
| Fabricantes | Linear Technology | |
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LTC1067/LTC1067-50
Rail-to-Rail, Very Low Noise
Universal Dual Filter Building Block
FEATURES
s Rail-to-Rail Input and Output Operation
s Operates from a Single 3V to ±5V Supply
s Dual 2nd Order Filter in a 16-Lead SSOP Package
s > 80dB Dynamic Range on Single 3.3V Supply
s Clock-to-Center Frequency Ratio of 100:1 for the
LTC1067 and 50:1 for the LTC1067-50
s Internal Sampling-to-Center Frequency Ratio of
200:1 for the LTC1067 and 100:1 for the LTC1067-50
s Center Frequency Error < ±0.2% Typ
s Low Noise: < 40µVRMS, Q ≤ 5
s Customizable with Internal Resistors
U
APPLICATIONS
s Notch Filters
s Narrowband Bandpass Filters
s Tone Detection
s Noise Reduction Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTION
The LTC®1067/LTC1067-50 consist of two identical rail-
to-rail, high accuracy and very wide dynamic range 2nd
order switched-capacitor building blocks. Each building
block, together with three to five resistors, provides 2nd
order filter functions such as bandpass, highpass, lowpass,
notch and allpass. High precision 4th order filters are
easily designed.
The center frequency of each 2nd order section is tuned by
the external clock frequency. The internal clock-to-center
frequency ratio (100:1 for the LTC1067 and 50:1 for the
LTC1067-50) can be modified by the external resistors.
These devices have a double sampled architecture which
places aliasing and imaging components at twice the clock
frequency. The LTC1067-50 is a low power device con-
suming about one half the current of the LTC1067. The
LTC1067-50’s typical supply current is about 1mA from a
3.3V supply.
The LTC1067 and LTC1067-50 are available in 16-pin
narrow SSOP and SO packages.
Mask programmable versions of the LTC1067 and
LTC1067-50, with thin film resistors on-chip and custom
clock-to-cutoff frequency ratios, can be designed in an
SO-8 package to realize application specific monolithic
filters. Please contact LTC Marketing for more details.
TYPICAL APPLICATION
Single 3.3V Supply Rail-to-Rail,
4th Order, 10kHz Bandpass Filter
1 V+
CLK 16 fCLK = 500kHz
2
NC
15
AGND
3.3V
3 V+
V– 14
1µF
0.1µF
4 13
SA SB
5
LTC1067-50
LPA LPB
12
R31, 200k 6
BPA
11
BPB
R21, 10k 7
10
R11 HPA/NA HPB/NB
200k
IN
8
INV A
9
INV B
OUT
R32, 200k
R22, 10k
RB1, 200k
TOTAL OUTPUT NOISE: 90µVRMS
S/N RATIO: 80dB
1067 TA01
Frequency Response
0
–10
–20
–30
–40
8
9 10 11
FREQUENCY (kHz)
12
1067 • TA02
1
1 page  
LTC1067/LTC1067-50
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1067
Noise + THD vs Input Frequency
–75
MODE 1
–80
MODE 3
–85
4TH ORDER BUTTERWORTH LPF
VS = SINGLE 5V, fCLK = 500kHz
VIN = 0.5VRMS, f–3dB = 5kHz, RL = 20k
–90
1
2 34
INPUT FREQUENCY (kHz)
5
1067 G07
LTC1067
Output Voltage Swing vs Load
Resistance, ±5V Supply Voltage
10.0
9.8 VS = ±5V
9.6
9.4
9.2
9.0
8.8
8.6
8.4
8.2
8.0
0 2 4 6 8 10 12 14 16 18 20
LOAD RESISTANCE (kΩ TO GND)
1067 G10
LTC1067-50
Maximum Q vs Center Frequency
(Modes 2 Where R4 < 10R2, 3)
50
VS = ±5V
40 fCLK(MAX) = 2MHz
VS = 5V
fCLK(MAX) = 1.5MHz
30 VS = 3.3V
fCLK(MAX) = 800kHz
20 VS = 3V
fCLK(MAX) = 600kHz
10
0
0 10 20 30 40
CENTER FREQUENCY, fO (kHz)
1067 G13
LTC1067
Noise + THD vs Input Frequency
–75
4TH ORDER LOWPASS
BUTTERWORTH
VS = ±5V, VIN = 1VRMS
fCLK = 1MHz, f–3dB = 10kHz
–80 RL = 20k
MODE 1
–85
MODE 3
–90
1
2 3 4 5 6 7 8 9 10
INPUT FREQUENCY (MHz)
1067 G08
LTC1067
Output Voltage Swing vs Load
Resistance, Single Supply Voltage
5.0
4.5 VS = 5V
4.0
3.5
VS = 3.3V
3.0
2.5
2.0
1.5
1.0
0
2 4 6 8 10 12 14 16 18 20
LOAD RESISTANCE (kΩ TO V–)
1067 G11
LTC1067-50
Maximum Q vs Center Frequency
(Modes 1, 1B, 2 Where R4 ≥ 10R2)
50
VS = ±5V
40 fCLK(MAX) = 2MHz
VS = 5V
30 fCLK(MAX) = 1.5MHz
VS = 3.3V
fCLK(MAX) = 800kHz
20 VS = 3V
fCLK(MAX) = 600kHz
10
0
0 10 20 30 40
CENTER FREQUENCY, fO (kHz)
1067 G14
LTC1067
Noise vs Q
220
200
180
160
140
120
100
80
60
40
20
0
0 10
±5V
5V
3V
20 30
Q
40 50
1067 G09
LTC1067
Power Supply Current
vs Power Supply
4.5
4.0
70°C
3.5
3.0
–20°C
2.5
25°C
2.0
1.5
0
3 4 5 6 7 8 9 10
TOTAL POWER SUPPLY (V)
1067 G12
LTC1067-50
Noise + THD vs Input Voltage
–20
4TH ORDER BUTTERWORTH LPF
–30 VS = SINGLE 3V, fIN = 1kHz
fCLK = 200kHz, f–3dB = 4kHz
–40
–50
–60
–70 MODE 1
–80
MODE 3
–90
–100
0.1
1
INPUT VOLTAGE (VRMS)
2
1067 G15
5
5 Page 
WU
ODES OF OPERATIO
Mode 3a
This is an extension of Mode 3 where the highpass and
lowpass outputs are summed through two external resis-
tors, RH and RL, to create a notch (see Figure 7). Mode 3a
is more versatile than Mode 2 because the notch fre-
quency can be higher or lower than the center frequency
of the 2nd order section. The external op amp of Figure 7
is not always required. When cascading the sections of the
LTC1067, the highpass and lowpass outputs can be
summed directly into the inverting input of the next
section.
Please refer to the Operating Limits paragraph under Appli-
cations Information for a guide to the use of capacitor CC.
LTC1067/LTC1067-50
Mode 2n
This mode extends the circuit topology of Mode 3a to
Mode 2 (Figure 8) where the highpass-notch and lowpass
outputs are summed through two external resistors, RH
and RL, to create a lowpass output with a notch higher in
frequency than the notch in Mode 2. This mode, shown in
Figure 8, is most useful in lowpass elliptic designs. When
cascading the sections of the LTC1067, the highpass-
notch and lowpass outputs can be summed directly into
the inverting input of the next section.
Please refer to the Operating Limits paragraph under Appli-
cations Information for a guide to the use of capacitor CC.
R1
VIN
R4
R3
R2
–
+
AGND
CC
HP S
+
–
Σ
∫
BP
∫
RH
√ √fO
=
fCLK
RATIO
R2
R4
;
fn
=
fCLK
RATIO
RH
RL
( ) √ ( )Q = 1.005
R3
R2
R2
R4
1
1
–
R3
(RATIO)(0.32)(R4)
( )( ) ( )( )LP
HOHPn (f = ∞) =
RG
RH
R2
R1
; HOLPn (f = 0) =
RG
RL
R4
R1
NOTE: RATIO = 100 FOR LTC1067
= 50 FOR LTC1067-50
RL RG
–
HIGHPASS
OR LOWPASS
+ NOTCH OUTPUT
EXTERNAL OP AMP OR INPUT OP
AMP OF THE LTC1067, SIDES A OR B 1067 F07
Figure 7. Mode 3a, 2nd Order Filter Providing a Highpass Notch or Lowpass Notch Output
R1
VIN
R4
R3
R2
–
+
AGND
CC
HP S
+
–
Σ
∫
BP
∫
RH
√fO
=
fCLK
RATIO
1 + R2
R4
√fn
=
fCLK
RATIO
1 + RH
RL
( )( ) ( )HOLPn (f = 0)=
RG
RH
+
RG
RL
R2
R1
1
1 + R2
R4
( ) √ ( )LP
Q = 1.005
R3
R2
1 + R2
1
R4
1
–
R3
(RATIO)(0.32)(R4)
NOTE: RATIO = 100 FOR LTC1067
= 50 FOR LTC1067-50
RL RG
–
LOWPASS
NOTCH
+ OUTPUT
EXTERNAL OP AMP OR INPUT OP AMP
OF THE LTC1067, SIDES A OR B
1067 F08
Figure 8. Mode 2n, 2nd Order Filter Providing a Lowpass Notch Output
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC1067CGN.PDF ] | |
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