8th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

_______________________________________________________________________________________

7

-90

-70

-80

-50

-60

-40

-30

-10

-20

0

012345

THD PLUS NOISE vs. INPUT SIGNAL

AMPLITUDE (MAX7403)

AMPLITUDE (Vp-p)

NO LOAD

(SEE TABLE A)

B

C

D

-90

-70

-80

-50

-60

-40

-30

-10

-20

0

012345

THD PLUS NOISE vs. INPUT SIGNAL

AMPLITUDE AND RESISTIVE LOAD (MAX7403)

TABLE A. THD PLUS NOISE vs. INPUT SIGNAL

AMPLITUDE TEST CONDITIONS

AMPLITUDE (Vp-p)

fIN = 200Hz

fC = 1kHz

MEASUREMENT BW = 22kHz

RL = 500Ω

RL = 1kΩ

RL = 10kΩ

TRACE

fIN

(Hz)

fC

(kHz)

fCLK

(kHz)

MEASUREMENT

BANDWIDTH (kHz)

A

B

C

2800

2000

1000

14

10

5

1400

1000

500

80

80

80

D

200

1

100

22

Typical Operating Characteristics (continued)

(VDD = +5V for MAX7400/MAX7403, VDD = +3V for MAX7404/MAX7407; VCOM = VOS = VDD / 2; SHDN = VDD; fCLK = 100kHz;

TA = +25°C; unless otherwise noted.)

-90

-70

-80

-40

-50

-60

-10

-20

-30

0

0

1.0

0.5

1.5

2.0

2.5

3.0

THD PLUS NOISE vs. INPUT SIGNAL

AMPLITUDE AND RESISTIVE LOAD (MAX7404)

AMPLITUDE (Vp-p)

RL = 10kΩ

RL = 1kΩ

RL = 500Ω

fIN = 200Hz

fC = 1kHz

MEASUREMENT BW = 22kHz

-90

-70

-80

-40

-50

-60

-10

-20

-30

0

0

1.0

0.5

1.5

2.0

2.5

3.0

THD PLUS NOISE vs. INPUT SIGNAL

AMPLITUDE (MAX7407)

AMPLITUDE (Vp-p)

NO LOAD

(SEE TABLE A)

A

B

C

D

-90

-70

-80

-40

-50

-60

-10

-20

-30

0

0

1.0

0.5

1.5

2.0

2.5

3.0

THD PLUS NOISE vs. INPUT SIGNAL

AMPLITUDE AND RESISTIVE LOAD (MAX7407)

AMPLITUDE (Vp-p)

RL = 500Ω

fIN = 200Hz

fC = 1kHz

MEASUREMENT BW = 22kHz

RL = 10kΩ

RL = 1kΩ

-90

-70

-80

-40

-50

-60

-10

-20

-30

0

0

1.0

0.5

1.5

2.0

2.5

3.0

THD PLUS NOISE vs. INPUT SIGNAL

AMPLITUDE (MAX7404)

AMPLITUDE (Vp-p)

B

NO LOAD

(SEE TABLE A)

C

D

A