Pin Description

PIN

Common Input. Biased internally at midsupply. Bypass externally to GND with a 0.1µF capacitor. To over-

ride internal biasing, drive with an external supply.

COM

1

FUNCTION

NAME

Filter Input

IN

2

Positive Supply Input: +5V for MAX7400/MAX7403, +3V for MAX7404/MAX7407

VDD

4

Ground

GND

3

Offset Adjust Input. To adjust output offset, bias OS externally. Connect OS to COM if no offset adjustment is

needed. Refer to

Offset and Common-Mode Input Adjustment section.

OS

6

Clock Input. To override the internal oscillator, connect to an external clock; otherwise, connect an external

capacitor (COSC) from CLK to GND to set the internal oscillator frequency.

CLK

8

Shutdown Input. Drive low to enable shutdown mode; drive high or connect to VDD for normal operation.

SHDN

7

Filter Output

OUT

5

8th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

8

_______________________________________________________________________________________

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.)

0.96

0.98

0.97

1.00

0.99

1.03

1.02

1.01

1.04

-40

0

-20

20

40

60

80

100

NORMALIZED OSCILLATOR FREQUENCY

vs. TEMPERATURE

TEMPERATURE (°C)

COSC = 390pF

MAX7400

MAX7403

MAX7404

MAX7407

0.80

0.85

0.90

0.95

1.00

1.05

1.10

1.15

1.20

2.5

3.5

3.0

4.0

4.5

5.0

5.5

NORMALIZED OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

COSC = 390pF

MAX7400

MAX7403

MAX7404

MAX7407

0.1

1

100

10

1000

10,000

0.01

1

0.1

10

100

1000

INTERNAL OSCILLATOR FREQUENCY

vs. COSC CAPACITANCE

COSC CAPACITANCE (nF)