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4
LTC1067/LTC1067-50
ELECTRICAL CHARACTERISTICS
LTC1067-50 (complete filter) VS = 4.75V, fCLK = 125kHz, TA = 25°C, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
fO Temperature Coefficient
±1
ppm/
°C
Q Temperature Coefficient
±5
ppm/
°C
DC Offset Voltage (See Table 2)
VOS1 (DC Offset of Input Inverter)
q
±3
±18
mV
VOS2 (DC Offset of First Integrator)
q
±4
±22
mV
VOS3 (DC Offset of Second Integrator)
q
±4
±22
mV
Clock Feedthrough
150
VRMS
Maximum Clock Frequency
Q < 2.5, VS = ±5V
2.0
MHz
Power Supply Current
VS = 3V, fCLK = 125kHz
q
1.00
2.5
mA
VS = 4.75V, fCLK = 125kHz
q
1.45
3.0
mA
VS = ±5V, fCLK = 250kHz
q
2.35
4.0
mA
The q 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, fO (kHz)
0
MAXIMUM
Q
20
1067 G01
5
10
15
50
40
30
20
10
0
VS = ±5V
fCLK(MAX) = 2MHz
VS = 3.3V
fCLK(MAX) = 1MHz
VS = 5V
fCLK(MAX) = 1.5MHz
CENTER FREQUENCY, fO (kHz)
0
MAXIMUM
Q
20
1067 G02
5
10
15
50
40
30
20
10
0
VS = 3.3V
fCLK(MAX) = 1MHz
VS = 5V
fCLK(MAX) = 1.5MHz
VS = ±5V
fCLK(MAX) = 2MHz
INPUT VOLTAGE (VRMS)
0.1
(NOISE
+
THD)/SIGNAL
(dB)
1
1067 G03
4TH ORDER BUTTERWORTH LPF
VS = SINGLE 3.3V, fIN = 1kHz
fCLK = 400kHz, f–3dB = 4kHz
RL = 20k
MODE 1
MODE 3
–20
–30
–40
–50
–60
–70
–80
–90
–100
2
LTC1067
Noise + THD vs Input Voltage
INPUT VOLTAGE (VRMS)
0.1
(NOISE
+
THD)/SIGNAL
(dB)
1
1067 G04
4TH ORDER BUTTERWORTH LPF
VS = SINGLE 5V, fIN = 1kHz
fCLK = 500kHz, f–3dB = 5kHz
RL = 20k
MODE 1
MODE 3
–20
–30
–40
–50
–60
–70
–80
–90
–100
2
INPUT VOLTAGE (VRMS)
0.1
1
5
1067 G05
(NOISE
+
THD)/SIGNAL
(dB)
–20
–30
–40
–50
–60
–70
–80
–90
–100
4TH ORDER BUTTERWORTH LPF
VS = ±5V, fIN = 1kHz
fCLK = 500kHz, f–3dB = 5kHz
RL = 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)
13
4
5
(NOISE
+
THD)/SIGNAL
(dB)
–60
–65
–70
–75
–80
–85
–90
2
1067 G06
4TH ORDER BUTTERWORTH LPF
VS = SINGLE 3.3V
fCLK = 400kHz, VIN = 0.36VRMS
f–3dB = 4kHz, RL = 20k
MODE 1
MODE 3
LTC1067
Noise + THD vs Input Frequency