MAX7491EEE datasheet(7/18 Pages) MAXIM

7 / 18 page

Dual Universal Switched-Capacitor Filters

_______________________________________________________________________________________

-20

-120

10k

MAX7490

THD + NOISE vs. FREQUENCY

INPUT FREQUENCY (Hz)

-30

-40

-50

-60

-70

-80

-90

-100

-110

A = MODE 1

B = MODE 3

-90

-80

-70

-60

-50

-40

-30

-20

-10

1.0

0.5

1.5

2.0

2.5

3.0

MAX7491

THD + NOISE vs. INPUT VOLTAGE

INPUT VOLTAGE (Vp-p)

A = MODE 1

B = MODE 3

-90

-80

-70

-60

-50

-40

-30

-20

-10

012345

MAX7490

THD + NOISE vs. INPUT VOLTAGE

INPUT VOLTAGE (Vp-p)

A = MODE 1

B = MODE 3

2.0

3.0

2.5

3.5

4.0

4.5

5.0

412

OUTPUT VOLTAGE SWING vs. RLOAD

RLOAD (k

Ω) TO COM

VDD = 5V

VDD = 3V

500

1500

1000

2000

2500

0400

200

600

800

1000

INTERNAL OSCILLATOR PERIOD

vs. SMALL CAPACITANCE

CAPACITANCE (pF)

VDD = 3V

VDD = 5V

100

120

140

160

4567

INTERNAL OSCILLATOR PERIOD

vs. LARGE CAPACITANCE

CAPACITANCE (nF)

VDD = 5V

VDD = 3V

126

128

127

130

129

132

131

133

3.0

4.0

3.5

4.5

5.0

5.5

INTERNAL OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

VDD (V)

COSC = 1000pF

124

130

128

126

132

134

136

138

140

142

144

-40

-15

INTERNAL OSCILLATOR FREQUENCY

vs. TEMPERATURE

TEMPERATURE (

°C)

VDD = 3V

VDD = 5V

COSC = 1000pF

Typical Operating Characteristics (continued)

(VDD = +5V for MAX7490, VDD = +3V for MAX7491, fCLK = 625kHz, SHDN = EXTCLK = VDD, COM = VDD/2, Mode 1, R3 = R1 = 50k

Ω,

R2 = 10k

Ω, Q = 5, TA = +25°C, unless otherwise noted.)

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