Rainbow-electronics MAX7491 Manual de usuario descargar pdf (Pagina 5)

MAX7490/MAX7491

Dual Universal Switched-Capacitor Filters

_______________________________________________________________________________________ 5

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER REQUIREMENTS

Supply Voltage V

2.7 3.6 V

Power-Supply Current I

No load, mode 1, R1 = R3 = 50kΩ,

R2 = 10kΩ, Q = 5

3.5 4.0 mA

Shutdown Current I

SHDN

SHDN = GND 1 µA

INTERNAL OP AMPS CHARACTERISTICS

Output Short-Circuit Current ±11 mA

DC Open-Loop Gain R

≥ 10kΩ, C

≤ 50pF 130 dB

Gain Bandwidth Product GBW R

≥ 10kΩ, C

≤ 50pF 7 MHz

Slew Rate SR R

≥ 10kΩ, C

≤ 50pF 6 V/µs

Note 1: Resistive loading of the N_/HP_, LP_, BP_ outputs includes the resistors used for the filter implementation.

Note 2: Crosstalk between internal filter sections is measured by applying a 1V

RMS

10kHz signal to one bandpass filter section input

and grounding the input of the other bandpass filter section. The crosstalk is the ratio between the output of the grounded

filter section and the 1V

RMS

input signal of the other section.

Note 3: Bandwidth of noise measurement is 80kHz.

Note 4: f

OSC

(kHz) = 135 x 10

/ C

OSC

in pF)

ELECTRICAL CHARACTERISTICS—MAX7491 (continued)

= EXTCLK = +3V, f

CLK

= 625kHz, T

= T

MIN

to T

MAX

, 10kΩ || 50pF load to V

/2 at LP_, BP_, and N_/HP_, SHDN = V

, 0.1µF

from COM to GND, 50% duty-cycle clock input, COM = V

/2. Typical values are at T

= +25°C, unless otherwise noted.) (Note 1)

Typical Operating Characteristics

= +5V for MAX7490, V

= +3V for MAX7491, f

CLK

= 625kHz, SHDN = EXTCLK = V

, COM = V

/2, Mode 1, R3 = R1 = 50kΩ,

R2 = 10kΩ, Q = 5, T

= +25°C, unless otherwise noted.)

-60

110 100

2ND-ORDER BANDPASS FILTER

FREQUENCY RESPONSE

-50

MAX7490-01

FREQUENCY (kHz)

GAIN (dB)

-30

-40

-10

-20

300

1 10 100

2ND-ORDER BANDPASS FILTER

PHASE RESPONSE

MAX7490-02

FREQUENCY (kHz)

PHASE (%)

100

200

150

250

= +5V

CLK

= 625kHz

= 5

-0.8

100 1000 10,000

CLK

DEVIATION vs. f

CLK

-0.7

MAX7490-03

CLK

(kHz)

CLK

DEVIATION (%)

-0.6

-0.2

-0.3

-0.4

-0.5

-0.1

= 5V

= 3V

1 2 3 4 5 6 7 8 9 10 ... 17 18

MAX7490/MAX7491 1

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Rainbow-electronics MAX7491 Manual de usuario Pagina 5

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