MAX7491EEE datasheet(5/18 Pages) MAXIM

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Dual Universal Switched-Capacitor Filters

_______________________________________________________________________________________

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

POWER REQUIREMENTS

Supply Voltage

VDD

2.7

3.6

Power-Supply Current

IDD

No load, mode 1, R1 = R3 = 50k

Ω,

R2 = 10k

Ω, Q = 5

3.5

4.0

Shutdown Current

ISHDN

SHDN = GND

µA

INTERNAL OP AMPS CHARACTERISTICS

Output Short-Circuit Current

±11

DC Open-Loop Gain

≥ 10kΩ, CL ≤ 50pF

130

Gain Bandwidth Product

GBW

≥ 10kΩ, CL ≤ 50pF

MHz

Slew Rate

≥ 10kΩ, CL ≤ 50pF

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 1VRMS 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 1VRMS input signal of the other section.

Note 3: Bandwidth of noise measurement is 80kHz.

Note 4: fOSC (kHz) = 135 x 103 / COSC (COSC in pF)

ELECTRICAL CHARACTERISTICS—MAX7491 (continued)

(VDD = EXTCLK = +3V, fCLK = 625kHz, TA = TMIN to TMAX, 10k

Ω || 50pF load to VDD/2 at LP_, BP_, and N_/HP_, SHDN = VDD, 0.1µF

from COM to GND, 50% duty-cycle clock input, COM = VDD/2. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)

Typical Operating Characteristics

(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.)

-60

110

100

2ND-ORDER BANDPASS FILTER

FREQUENCY RESPONSE

-50

FREQUENCY (kHz)

-30

-40

-10

-20

300

100

2ND-ORDER BANDPASS FILTER

PHASE RESPONSE

FREQUENCY (kHz)

100

200

150

250

VDD = +5V

fCLK = 625kHz

Q = 5

-0.8

100

1000

10,000

fCLK/fO DEVIATION vs. fCLK

-0.7

fCLK (kHz)

-0.6

-0.2

-0.3

-0.4

-0.5

-0.1

VDD = 5V

VDD = 3V

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