Dual Universal Switched-Capacitor Filters

6

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-0.6

-0.4

-0.5

-0.3

-0.2

-0.1

0

0.1

0.2

040

20

60

80

100

CLOCK-TO-CENTER FREQUENCY

DEVIATION vs. Q

Q

VDD = 5V

VDD = 3V

-0.7

-0.3

-0.4

-0.6

-0.2

-0.5

-0.1

0

0.1

0.3

0.2

0.4

0.5

0.6

0.7

-40

10

-15

35

60

85

CLOCK-TO-CENTER FREQUENCY

DEVIATION vs. TEMPERATURE

TEMPERATURE (

°C)

1

-6

100

1000

10,000

Q DEVIATION vs. CLOCK FREQUENCY

-5

fCLK (kHz)

-4

-1

-2

-3

0

VDD = 3V

VDD = 5V

-2.0

-1.0

-1.5

-0.5

0

0.5

1.0

1.5

2.0

-40

10

-15

35

60

85

Q DEVIATION vs. TEMPERATURE

TEMPERATURE (°C)

0

150

100

50

200

250

300

350

400

450

500

040

20

60

80

100

NOISE vs. Q

Q

3.0

3.2

3.1

3.4

3.3

3.6

3.5

3.7

-40

10

-15

356085

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

VDD = 5V

VDD = 3V

3.0

3.3

3.2

3.1

3.4

3.5

3.6

3.7

3.8

3.9

4.0

3.0

4.0

3.5

4.5

5.0

5.5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

VDD (V)

fCLK = 3MHz

fCLK = 625kHz

fCLK = 2kHz

3.32

3.34

3.33

3.37

3.36

3.35

3.40

3.39

3.38

3.41

3.0

4.0

3.5

4.5

5.0

5.5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

VDD (V)

-40°C

+25°C

+85°C

-20

-120

1k

10k

MAX7491

THD + NOISE vs. FREQUENCY

INPUT FREQUENCY (Hz)

-30

-40

-50

-60

-70

-80

-90

-100

-110

A

B

A = MODE 1

B = MODE 3

Typical Operating Characteristics (continued)

(VDD = +5V for MAX7490, VDD = +3V for MAX7491, fCLK = 625kHz, VSHDN = VEXTCLK = VDD, COM = VDD/2, Mode 1, R3 = R1 = 50kΩ,

R2 = 10kΩ, Q = 5, TA = +25°C, unless otherwise noted.)