4
LTC1067/LTC1067-50
ELECTRICAL CHARACTERISTICS
LTC1067-50 (complete filter) V
S
= 4.75V, f
CLK
= 125kHz, T
A
= 25°C, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
f
O
Temperature Coefficient ±1 ppm/°C
Q Temperature Coefficient ±5 ppm/°C
DC Offset Voltage (See Table 2) V
OS1
(DC Offset of Input Inverter) ● ±3 ±18 mV
V
OS2
(DC Offset of First Integrator) ● ±4 ±22 mV
V
OS3
(DC Offset of Second Integrator) ● ±4 ±22 mV
Clock Feedthrough 150 µV
RMS
Maximum Clock Frequency Q < 2.5, V
S
= ±5V 2.0 MHz
Power Supply Current V
S
= 3V, f
CLK
= 125kHz ● 1.00 2.5 mA
V
S
= 4.75V, f
CLK
= 125kHz ● 1.45 3.0 mA
V
S
= ±5V, f
CLK
= 250kHz ● 2.35 4.0 mA
The
● denotes the specifications which apply over the full operating
temperature range.
Note 1: See Typical Performance Characteristics.
LTC1067 Maximum Q vs
Center Frequency
(Modes 2 where R4 < 10R2, 3)
LTC1067 Maximum Q vs
Center Frequency
(Modes 1, 1B, 2 where R4 ≥ 10R2)
CENTER FREQUENCY, f
O
(kHz)
0
MAXIMUM Q
20
1067 G01
5
10
15
50
40
30
20
10
0
V
S
= ±5V
f
CLK(MAX)
= 2MHz
V
S
= 3.3V
f
CLK(MAX)
= 1MHz
V
S
= 5V
f
CLK(MAX)
= 1.5MHz
CENTER FREQUENCY, f
O
(kHz)
0
MAXIMUM Q
20
1067 G02
5
10
15
50
40
30
20
10
0
V
S
= 3.3V
f
CLK(MAX)
= 1MHz
V
S
= 5V
f
CLK(MAX)
= 1.5MHz
V
S
= ±5V
f
CLK(MAX)
= 2MHz
INPUT VOLTAGE (V
RMS
)
0.1
(NOISE + THD)/SIGNAL (dB)
1
1067 G03
4TH ORDER BUTTERWORTH LPF
V
S
= SINGLE 3.3V, f
IN
= 1kHz
f
CLK
= 400kHz, f
–3dB
= 4kHz
R
L
= 20k
MODE 1
MODE 3
–20
–30
–40
–50
–60
–70
–80
–90
–100
2
LTC1067
Noise + THD vs Input Voltage
INPUT VOLTAGE (V
RMS
)
0.1
(NOISE + THD)/SIGNAL (dB)
1
1067 G04
4TH ORDER BUTTERWORTH LPF
V
S
= SINGLE 5V, f
IN
= 1kHz
f
CLK
= 500kHz, f
–3dB
= 5kHz
R
L
= 20k
MODE 1
MODE 3
–20
–30
–40
–50
–60
–70
–80
–90
–100
2
INPUT VOLTAGE (V
RMS
)
0.1 1 5
1067 G05
(NOISE + THD)/SIGNAL (dB)
–20
–30
–40
–50
–60
–70
–80
–90
–100
4TH ORDER BUTTERWORTH LPF
V
S
= ±5V, f
IN
= 1kHz
f
CLK
= 500kHz, f
–3dB
= 5kHz
R
L
= 20k
MODE 1
MODE 3
MODE 2
LTC1067
Noise + THD vs Input Voltage
LTC1067
Noise + THD vs Input Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
INPUT FREQUENCY (kHz)
1345
(NOISE + THD)/SIGNAL (dB)
–60
–65
–70
–75
–80
–85
–90
2
1067 G06
4TH ORDER BUTTERWORTH LPF
V
S
= SINGLE 3.3V
f
CLK
= 400kHz, V
IN
= 0.36V
RMS
f
–3dB
= 4kHz, R
L
= 20k
MODE 1
MODE 3
LTC1067
Noise + THD vs Input Frequency
