LTC1067/LTC1067-50
Rail-to-Rail, Very Low Noise
Universal Dual Filter Building Block
FEATURES
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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.
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Rail-to-Rail Input and Output Operation
Operates from a Single 3V to
±
5V Supply
Dual 2nd Order Filter in a 16-Lead SSOP Package
> 80dB Dynamic Range on Single 3.3V Supply
Clock-to-Center Frequency Ratio of 100:1 for the
LTC1067 and 50:1 for the LTC1067-50
Internal Sampling-to-Center Frequency Ratio of
200:1 for the LTC1067 and 100:1 for the LTC1067-50
Center Frequency Error <
±0.2%
Typ
Low Noise: < 40µV
RMS
, Q
≤
5
Customizable with Internal Resistors
APPLICATIONS
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Notch Filters
Narrowband Bandpass Filters
Tone Detection
Noise Reduction Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Single 3.3V Supply Rail-to-Rail,
4th Order, 10kHz Bandpass Filter
1
2
3.3V
0.1µF
3
4
V
+
NC
V
+
SA
CLK
AGND
V
–
SB
16
15
14
13
OUT
R32, 200k
–30
0
f
CLK
= 500kHz
–10
1µF
GAIN (dB)
–20
LTC1067-50
5
12
LPA
LPB
R31, 200k
R21, 10k
R11
200k
IN
6
7
8
BPA
HPA/NA
INV A
BPB
HPB/NB
INV B
11
10
9
R22, 10k
–40
RB1, 200k
1067 TA01
TOTAL OUTPUT NOISE: 90µV
RMS
S/N RATIO: 80dB
8
U
U
U
Frequency Response
9
10
FREQUENCY (kHz)
11
12
1067 • TA02
1
LTC1067/LTC1067-50
ABSOLUTE
MAXIMUM
RATINGS
Total Voltage Supply (V
+
to V
–
) .............................. 12V
Input Voltage ........................ (V
+
+ 0.3V) to (V
–
– 0.3V)
Output Short-Circuit Duration .......................... Indefinite
Power Dissipation ............................................... 500mV
Operating Temperature Range
LTC1067C ............................................... 0°C to 70°C
LTC1067I ............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
V
+
1
NC 2
V
+
3
SA 4
LPA 5
BPA 6
HPA/NA 7
INV A 8
16 CLK
15 AGND
14 V
–
13 SB
12 LPB
11 BPB
10 HPB/NB
9
INV B
ORDER PART
NUMBER
LTC1067CGN
LTC1067-50CGN
LTC1067IGN
LTC1067-50IGN
LTC1067CS
LTC1067-50CS
LTC1067IS
LTC1067-50IS
GN PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
T
JMAX
= 110°C,
θ
JA
= 135°C/ W (GN)
T
JMAX
= 110°C,
θ
JA
= 115°C/ W (S)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER
Operating Supply Range
Positive Output Voltage Swing
CONDITIONS
V
S
= 3V, R
L
= 10k
V
S
= 4.75V, R
L
= 10k
V
S
=
±5V,
R
L
= 10k
V
S
= 3V, R
L
= 10k
V
S
= 4.75V, R
L
= 10k
V
S
=
±5V,
R
L
= 10k
V
S
= 3V
V
S
= 4.75V
V
S
=
±5V
R
L
= 10k
R
L
= 10k
R
L
= 10k
LTC1067 (internal op amps) V
S
= 4.75V, T
A
= 25°C, unless otherwise noted.
MIN
3
2.65
4.25
4.15
TYP
2.80
4.50
4.50
0.020
0.025
– 4.96
16/1.0
33/2.2
70/7.2
90
2.8
2.25
MAX
11
UNITS
V
V
V
V
V
V
V
mA
mA
mA
dB
MHz
V/µs
q
q
q
q
q
q
Negative Output Voltage Swing
0.200
0.225
– 4.80
Output Short-Circuit Current
(Source/Sink)
DC Open-Loop Gain
GBW Product
Slew Rate
LTC1067 (complete filter) V
S
= 4.75V, f
CLK
= 250kHz, T
A
= 25°C, unless otherwise noted.
PARAMETER
Center Frequency Range, f
O
(Note 1)
Input Frequency Range
Clock-to-Center Frequency, f
CLK
/f
O
CONDITIONS
MIN
TYP
0.001 to 20
0 to 1
100:1
±0.2
100:1
±0.2
q
MAX
Clock-to-Center Frequency Ratio,
Side-to-Side Matching
V
S
= 3V, f
CLK
= 250kHz, Mode 1, f
O
= 2.5kHz, Q = 5
R1 = R3 = 49.9k, R2 = 10k
V
S
= 4.75V, f
CLK
= 250kHz, Mode 1, f
O
= 2.5kHz, Q = 5
R1 = R3 = 49.9k, R2 = 10k
V
S
=
±5V,
f
CLK
= 500kHz, Mode 1, f
O
= 5kHz, Q = 5
R1 = R3 = 49.9k, R2 = 10k
V
S
= 3V, f
CLK
= 250kHz, Q = 5
V
S
= 4.75V, f
CLK
= 250kHz, Q = 5
V
S
=
±5V,
f
CLK
= 500kHz, Q = 5
q
±0.70
±0.70
±0.70
±0.35
±0.35
±0.35
100:1
±0.2
q
q
q
q
±0.1
±0.1
±0.1
UNITS
kHz
MHz
%
%
%
%
%
%
%
%
%
2
U
W
U
U
W W
W
LTC1067/LTC1067-50
ELECTRICAL CHARACTERISTICS
LTC1067 (complete filter) V
S
= 4.75V, f
CLK
= 250kHz, T
A
= 25°C, unless otherwise noted.
PARAMETER
Q Accuracy
CONDITIONS
V
S
= 3V, f
CLK
= 250kHz, Q = 5
V
S
= 4.75V, f
CLK
= 250kHz, Q = 5
V
S
=
±5V,
f
CLK
= 500kHz, Q = 5
MIN
q
q
q
f
O
Temperature Coefficient
Q Temperature Coefficient
DC Offset Voltage (See Table 2)
V
OS1
(DC Offset of Input Inverter)
V
OS2
(DC Offset of First Integrator)
V
OS3
(DC Offset of Second Integrator)
Q < 2.5, V
S
=
±5V
V
S
= 3V, f
CLK
= 250kHz
V
S
= 4.75V, f
CLK
= 250kHz
V
S
=
±5V,
f
CLK
= 500kHz
q
q
q
Clock Feedthrough
Maximum Clock Frequency
Power Supply Current
q
q
q
TYP
±0.5
±0.5
±0.5
±
1
±5
±3
±4
±4
150
2.0
2.50
3.00
4.35
MAX
±2
±2
±2
±18
±22
±22
4.5
5.5
7.5
UNITS
%
%
%
ppm/°C
ppm/°C
mV
mV
mV
µV
RMS
MHz
mA
mA
mA
LTC1067-50 (internal op amps) V
S
= 4.75V, T
A
= 25°C, unless otherwise noted.
PARAMETER
Operating Supply Range
Positive Output Voltage Swing
CONDITIONS
V
S
= 3V, R
L
= 10k
V
S
= 4.75V, R
L
= 10k
V
S
=
±5V,
R
L
= 10k
V
S
= 3V, R
L
= 10k
V
S
= 4.75V, R
L
= 10k
V
S
=
±5V,
R
L
= 10k
V
S
= 3V
V
S
= 4.75V
V
S
=
±5V
R
L
= 10k
R
L
= 10k
R
L
= 10k
q
q
q
q
q
q
MIN
2.7
2.65
4.25
4.15
TYP
2.80
4.50
4.50
0.020
0.025
– 4.96
16/0.6
33/1.2
70/5.7
90
1.9
0.8
MAX
11
Negative Output Voltage Swing
0.200
0.225
– 4.80
Output Short-Circuit Current
(Source/Sink)
DC Open-Loop Gain
GBW Product
Slew Rate
UNITS
V
V
V
V
V
V
V
mA
mA
mA
dB
MHz
V/µs
LTC1067-50 (complete filter) V
S
= 4.75V, f
CLK
= 125kHz, T
A
= 25°C, unless otherwise noted.
PARAMETER
Center Frequency Range, f
O
(Note 1)
Input Frequency Range
Clock-to-Center Frequency, f
CLK
/f
O
CONDITIONS
MIN
TYP
0.001 to 40
0 to 1
50:1
±0.2
50:1
±0.2
q
MAX
Clock-to-Center Frequency Ratio,
Side-to-Side Matching
Q Accuracy
V
S
= 3V, f
CLK
= 125kHz, Mode 1, f
O
= 2.5kHz, Q = 5
R1 = R3 = 49.9k, R2 = 10k
V
S
= 4.75V, f
CLK
= 125kHz, Mode 1, f
O
= 2.5kHz, Q = 5
R1 = R3 = 49.9k, R2 = 10k
V
S
=
±5V,
f
CLK
= 250kHz, Mode 1, f
O
= 5kHz, Q = 5
R1 = R3 = 49.9k, R2 = 10k
V
S
= 3V, f
CLK
= 125kHz, Q = 5
V
S
= 4.75V, f
CLK
= 125kHz, Q = 5
V
S
=
±5V,
f
CLK
= 250kHz, Q = 5
V
S
= 3V, f
CLK
= 125kHz, Q = 5
V
S
= 4.75V, f
CLK
= 125kHz, Q = 5
V
S
=
±5V,
f
CLK
= 250kHz, Q = 5
q
±0.75
±0.75
±0.75
±0.55
±0.55
±0.55
±2
±2
±2
50:1
±0.3
q
q
q
q
q
q
q
±0.2
±0.2
±0.2
±0.5
±0.5
±0.5
UNITS
kHz
MHz
%
%
%
%
%
%
%
%
%
%
%
%
3
LTC1067/LTC1067-50
ELECTRICAL CHARACTERISTICS
LTC1067-50 (complete filter) V
S
= 4.75V, f
CLK
= 125kHz, T
A
= 25°C, unless otherwise noted.
PARAMETER
f
O
Temperature Coefficient
Q Temperature Coefficient
DC Offset Voltage (See Table 2)
CONDITIONS
MIN
TYP
±
1
±5
±3
±4
±4
150
2.0
1.00
1.45
2.35
MAX
UNITS
ppm/°C
ppm/°C
mV
mV
mV
µV
RMS
MHz
mA
mA
mA
V
OS1
(DC Offset of Input Inverter)
V
OS2
(DC Offset of First Integrator)
V
OS3
(DC Offset of Second Integrator)
Q < 2.5, V
S
=
±5V
V
S
= 3V, f
CLK
= 125kHz
V
S
= 4.75V, f
CLK
= 125kHz
V
S
=
±5V,
f
CLK
= 250kHz
q
q
q
±18
±22
±22
Clock Feedthrough
Maximum Clock Frequency
Power Supply Current
q
q
q
2.5
3.0
4.0
The
q
denotes the specifications which apply over the full operating
temperature range.
Note 1:
See Typical Performance Characteristics.
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1067 Maximum Q vs
Center Frequency
(Modes 1, 1B, 2 where R4
≥
10R2)
50
V
S
=
±5V
f
CLK(MAX)
= 2MHz
V
S
= 5V
f
CLK(MAX)
= 1.5MHz
30
V
S
= 3.3V
f
CLK(MAX)
= 1MHz
20
50
V
S
=
±5V
f
CLK(MAX)
= 2MHz
V
S
= 5V
f
CLK(MAX)
= 1.5MHz
V
S
= 3.3V
f
CLK(MAX)
= 1MHz
(NOISE + THD)/SIGNAL (dB)
40
MAXIMUM Q
MAXIMUM Q
10
0
0
10
5
15
CENTER FREQUENCY, f
O
(kHz)
LTC1067
Noise + THD vs Input Voltage
–20
–30
4TH ORDER BUTTERWORTH LPF
V
S
= SINGLE 5V, f
IN
= 1kHz
f
CLK
= 500kHz, f
–3dB
= 5kHz
R
L
= 20k
(NOISE + THD)/SIGNAL (dB)
(NOISE + THD)/SIGNAL (dB)
–40
–50
–60
–70
–80
–90
–100
0.1
–40
–50
–60
–70
–80
–90
(NOISE + THD)/SIGNAL (dB)
MODE 1
MODE 3
1
INPUT VOLTAGE (V
RMS
)
4
U W
1067 G01
LTC1067 Maximum Q vs
Center Frequency
(Modes 2 where R4 < 10R2, 3)
–20
–30
–40
–50
–60
–70
–80
–90
0
LTC1067
Noise + THD vs Input Voltage
4TH ORDER BUTTERWORTH LPF
V
S
= SINGLE 3.3V, f
IN
= 1kHz
f
CLK
= 400kHz, f
–3dB
= 4kHz
R
L
= 20k
40
30
20
MODE 1
MODE 3
10
20
0
10
5
15
CENTER FREQUENCY, f
O
(kHz)
20
1067 G02
–100
0.1
1
INPUT VOLTAGE (V
RMS
)
2
1067 G03
LTC1067
Noise + THD vs Input Voltage
–20
–30
4TH ORDER BUTTERWORTH LPF
V
S
=
±5V,
f
IN
= 1kHz
f
CLK
= 500kHz, f
–3dB
= 5kHz
R
L
= 20k
–60
–65
–70
–75
–80
–85
–90
LTC1067
Noise + THD vs Input Frequency
MODE 1
MODE 2
MODE 1
MODE 3
1
INPUT VOLTAGE (V
RMS
)
5
1067 G05
MODE 3
4TH ORDER BUTTERWORTH LPF
V
S
= SINGLE 3.3V
f
CLK
= 400kHz, V
IN
= 0.36V
RMS
f
–3dB
= 4kHz, R
L
= 20k
3
2
INPUT FREQUENCY (kHz)
4
5
2
1067 G04
–100
0.1
1
1067 G06
LTC1067/LTC1067-50
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1067
Noise + THD vs Input Frequency
–75
(NOISE + THD)/SIGNAL (dB)
MODE 1
–80
(NOISE + THD)/SIGNAL (dB)
NOISE (µV
RMS
)
MODE 3
–85
4TH ORDER BUTTERWORTH LPF
V
S
= SINGLE 5V, f
CLK
= 500kHz
V
IN
= 0.5V
RMS,
f
–3dB
= 5kHz, R
L
= 20k
–90
1
3
2
INPUT FREQUENCY (kHz)
4
5
LTC1067
Output Voltage Swing vs Load
Resistance,
±5V
Supply Voltage
10.0
9.8
V
S
=
±5V
5.0
OUTPUT VOLTAGE SWING (V
P-P
)
OUTPUT VOLTAGE SWING (V
P-P
)
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
POWER SUPPLY CURRENT (mA)
LTC1067-50
Maximum Q vs Center Frequency
(Modes 2 Where R4 < 10R2, 3)
50
V
S
=
±5V
f
CLK(MAX)
= 2MHz
MAXIMUM Q
V
S
= 5V
f
CLK(MAX)
= 1.5MHz
30
V
S
= 3.3V
f
CLK(MAX)
= 800kHz
V
S
= 3V
f
CLK(MAX)
= 600kHz
50
(NOISE + THD)/SIGNAL (dB)
40
MAXIMUM Q
20
10
0
0
20
10
30
CENTER FREQUENCY, f
O
(kHz)
U W
1067 G07
LTC1067
Noise + THD vs Input Frequency
–75
4TH ORDER LOWPASS
BUTTERWORTH
V
S
=
±5V,
V
IN
= 1V
RMS
f
CLK
= 1MHz, f
–3dB
= 10kHz
R
L
= 20k
220
200
180
160
140
120
100
80
60
40
20
LTC1067
Noise vs Q
±5V
–80
5V
3V
MODE 1
–85
MODE 3
–90
1
3
2
4 5 6 7 8 9 10
INPUT FREQUENCY (MHz)
1067 G08
0
0
10
20
Q
30
40
50
1067 G09
LTC1067
Output Voltage Swing vs Load
Resistance, Single Supply Voltage
4.5
LTC1067
Power Supply Current
vs Power Supply
4.0
70°C
3.5
3.0
–20°C
2.5
2.0
1.5
0
25°C
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0
2
4
6
V
S
= 5V
V
S
= 3.3V
8
10 12 14 16 18 20
–
)
1067 G11
3
4
LOAD RESISTANCE (kΩ TO V
7
9
6
8
5
TOTAL POWER SUPPLY (V)
10
1067 G12
LTC1067-50
Maximum Q vs Center Frequency
(Modes 1, 1B, 2 Where R4
≥
10R2)
–20
V
S
=
±5V
f
CLK(MAX)
= 2MHz
V
S
= 5V
f
CLK(MAX)
= 1.5MHz
V
S
= 3.3V
f
CLK(MAX)
= 800kHz
20
V
S
= 3V
f
CLK(MAX)
= 600kHz
LTC1067-50
Noise + THD vs Input Voltage
–30
–40
–50
–60
–70
–80
–90
MODE 1
MODE 3
4TH ORDER BUTTERWORTH LPF
V
S
= SINGLE 3V, f
IN
= 1kHz
f
CLK
= 200kHz, f
–3dB
= 4kHz
40
30
10
0
40
1067 G13
0
20
10
30
CENTER FREQUENCY, f
O
(kHz)
40
1067 G14
–100
0.1
1
INPUT VOLTAGE (V
RMS
)
2
1067 G15
5
Talking
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