Rainbow-electronics MAX7415 Instrukcja Użytkownika Pobierz pdf (Strona 5)

MAX7408/MAX7411/MAX7412/MAX7415

5th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

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ELLIPTIC FILTER (r = 1.25) CHARACTERISTICS—MAX7411/MAX7415

= +5V for MAX7411, V

= +3V for MAX7415; filter output measured at OUT; 10kΩ || 50pF load to GND at OUT; SHDN = V

DD,

COM

= V

/ 2; f

CLK

= 100kHz; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical values are at T

= +25°C.) (Note 3)

Note 1: The maximum f

is defined as the clock frequency f

CLK

= 100 · f

at which the peak SINAD drops to 68dB with a sinusoidal

input at 0.2f

Note 2: DC insertion gain is defined as ∆V

OUT

/ ∆V

Note 3: f

OSC

(kHz) ≈ 27 · 10

/ C

OSC

in pF).

Note 4: The input frequencies, f

, are selected at the peaks and troughs of the ideal elliptic frequency responses.

= 0.68f

= 0.38f

= 3.25f

= 1.43f

= 1.25f

= 0.87f

= 0.97f

= f

CONDITIONS

-0.4 0.2 0.4

-0.4 -0.2 0.4

Insertion Gain

with DC Gain Error Removed

(Note 4)

-37.2 -35

-38.5 -34

-0.4 -0.2 0.4

-0.4 0.2 0.4

-0.7 -0.2 0.2

UNITSMIN TYP MAXPARAMETER

-120

-100

-80

-20

-40

-60

0 1 2 3 4 5

MAX7408/MAX7412

FREQUENCY RESPONSE

MAX7408/11-01

INPUT FREQUENCY (kHz)

GAIN (dB)

= 1kHz

r = 1.6

-120

-100

-80

-20

-40

-60

0 1 2 3 4 5

MAX7411/MAX7415

FREQUENCY RESPONSE

MAX7408/11-02

INPUT FREQUENCY (kHz)

GAIN (dB)

= 1kHz

r = 1.25

-1.2

-1.0

-0.8

-0.2

-0.4

-0.6

0.2

0 204 408 612 816 1.02k

MAX7408/MAX7412

PASSBAND FREQUENCY RESPONSE

MAX7408/11-03

INPUT FREQUENCY (Hz)

GAIN (dB)

= 1kHz

r = 1.6

Typical Operating Characteristics

= +5V for MAX7408/MAX7411, V

= +3V for MAX7412/MAX7415; f

CLK

= 100kHz; SHDN = V

; V

COM

= V

/ 2;

= +25°C; unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 12

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