(VDD = +5V for MAX7418–MAX7421, VDD = +3V for MAX7422–MAX7425; fCLK = 2.2MHz; SHDN = VDD; VCOM = VOS = VDD / 2;

TA = +25°C; unless otherwise noted.)

Analog Devices │ 8

www.analog.com

MAX7418–MAX7425

5th-Order, Lowpass,

Switched-Capacitor Filters

Typical Operating Characteristics (continued)

-90

-70

-80

-40

-50

-60

-30

-20

-10

0

0

0.5

1.0

1.5

2.0

2.5

3.0

MAX7424

THD + NOISE vs. INPUT SIGNAL AMPLITUDE

(BUTTERWORTH)

AMPLITUDE (Vp-p)

B

A

C

SEE TABLE A

0

2

1

4

3

5

6

10

100

1000

INTERNAL OSCILLATOR FREQUENCY

vs. LARGE CAPACITANCE (nF)

CAPACITANCE (nF)

ELLIPTIC

BESSEL/BUTTERWORTH

2.3

2.5

2.9

2.7

3.1

3.3

2.5

3.5

3.0

4.0

4.5

5.0

5.5

ELLIPTIC SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

-90

-70

-80

-40

-50

-60

-30

-20

-10

0

0

0.5

1.0

1.5

2.0

2.5

3.0

MAX7425

THD + NOISE vs. INPUT SIGNAL AMPLITUDE

(ELLIPTIC, R = 1.25)

AMPLITUDE (Vp-p)

B

A

C

SEE TABLE A

84.0

85.0

84.5

86.0

85.5

86.5

87.0

2.5

3.5

4.0

3.0

4.5

5.0

5.5

ELLIPTIC INTERNAL OSCILLATOR

FREQUENCY vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

COSC = 1000PF

2.5

2.6

2.8

2.7

2.9

3.0

-40

10

-15

35

60

85

ELLIPTIC SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

VDD = 5V

VDD = 3V

0

2000

1000

4000

3000

6000

5000

7000

INTERNAL OSCILLATOR FREQUENCY

vs. SMALL CAPACITANCE (pF)

CAPACITANCE ( pF)

1

10

100

1000

10000

ELLIPTIC

BESSEL/BUTTERWORTH

84.0

85.0

84.5

86.0

85.5

86.5

87.0

-40

10

-15

35

60

85

ELLIPTIC INTERNAL OSCILLATOR

FREQUENCY vs. TEMPERATURE

TEMPERATURE (°C)

VDD = 3V

VDD = 5V

COSC = 1000PF

LABEL

fIN

(kHz)

fC

(kHz)

fCLK

(kHz)

BW

(kHz)

A

2

30

3000

80

B

2

22

2200

80

C

1

10

1000

22

D

2

22

2200

80

E

1

10

1000

22

Table A.