MAX7490EEE(2000) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX7490EEE
(Rev.:2000)

Dual Universal Switched-Capacitor Filters

Maxim Integrated 

Dual Universal Switched-Capacitor Filters

ELECTRICAL CHARACTERISTICS—MAX7491 (continued)

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

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

POWER REQUIREMENTS

Supply Voltage

VDD

2.7

3.6

V

Power-Supply Current

IDD

No load, mode 1, R1 = R3 = 50kΩ,

R2 = 10kΩ, Q = 5

3.5

4.0

mA

Shutdown Current

ISHDN SHDN = GND

1

µA

INTERNAL OP AMPS CHARACTERISTICS

Output Short-Circuit Current

±11

mA

DC Open-Loop Gain

Gain Bandwidth Product

Slew Rate

GBW

SR

RL ≥ 10kΩ, CL ≤ 50pF

RL ≥ 10kΩ, CL ≤ 50pF

RL ≥ 10kΩ, CL ≤ 50pF

130

dB

7

MHz

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 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)

Typical Operating Characteristics

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

R2 = 10kΩ, Q = 5, TA = +25°C, unless otherwise noted.)

2ND-ORDER BANDPASS FILTER

FREQUENCY RESPONSE

10

2ND-ORDER BANDPASS FILTER

PHASE RESPONSE

300

fCLK/fO DEVIATION vs. fCLK

0

0

-10

-20

-30

-40

-50

-60

1

10

FREQUENCY (kHz)

250

200

150

100

50 VDD = +5V

fCLK = 625kHz

Q=5

0

100

1

10

FREQUENCY (kHz)

-0.1

-0.2

-0.3

-0.4

-0.5

-0.6

-0.7

-0.8

100

100

VDD = 5V

VDD = 3V

1000

fCLK (kHz)

10,000

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