MAX7490 データシートの表示（PDF） - Maxim Integrated

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MAX7490

Dual Universal Switched-Capacitor Filters

Maxim Integrated 

Dual Universal Switched-Capacitor Filters

ELECTRICAL CHARACTERISTICS—MAX7491 (continued)

(VDD = VEXTCLK = +3V; fCLK = 625kHz; 10kΩ || 50pF load to VDD/2 at LP_, BP_, and N_/HP_; VSHDN = VDD; 0.1µF from COM to

GND; 50% duty-cycle clock input; COM = VDD/2; TA = TMIN to TMAX. 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

Shutdown Current

ISHDN

INTERNAL OP AMPS CHARACTERISTICS

Output Short-Circuit Current

DC Open-Loop Gain

Gain Bandwidth Product

GBW

Slew Rate

SR

No load, mode 1, R1 = R3 = 50kΩ,

R2 = 10kΩ, Q = 5

SHDN = GND

RL ≥ 10kΩ, CL ≤ 50pF

RL ≥ 10kΩ, CL ≤ 50pF

RL ≥ 10kΩ, CL ≤ 50pF

3.5

4.0

mA

1

μA

±11

mA

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, VSHDN = VEXTCLK = 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

CLOCK-TO-CENTER FREQUENCY

DEVIATION vs. CLOCK FREQUENCY

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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