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

µVRMS

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

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

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

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

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

–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

INPUT FREQUENCY (kHz)

13

4

5

–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