Rainbow-electronics MAX7407 Bedienungsanleitung PDF herunterladen (Seite 5)

8th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

_______________________________________________________________________________________ 5

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: OS voltages above V

- 1V saturate the input and result in a 75µA typical input leakage current.

Note 4: For MAX7400/MAX7403, f

OSC

(kHz) ≅ 38 · 10

/ C

OSC

(pF). For MAX7404/MAX7407, f

OSC

(kHz) ≅ 34 · 10

/ C

OSC

(pF).

Note 5: The input frequencies, f

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

ELLIPTIC (r = 1.2) FILTER CHARACTERISTICS—MAX7403/MAX7407

= +5V for MAX7403, V

= +3V for MAX7407; filter output measured at OUT; 10kΩ || 50pF load to GND at OUT; SHDN = V

;

COM

= V

/ 2; f

CLK

= 100kHz; T

= T

MIN

to T

MAX

; unless otherwise noted. Typical values are at T

= +25°C.)

Typical Operating Characteristics

= +5V for MAX7400/MAX7403, V

= +3V for MAX7404/MAX7407; V

COM

= V

/ 2; SHDN = V

; f

CLK

= 100kHz;

= +25°C; unless otherwise noted.)

-120

-80

-100

-40

-60

-20

012345

MAX7400/MAX7404 (r = 1.5)

FREQUENCY RESPONSE

MAX7400/03-01

INPUT FREQUENCY (kHz)

GAIN (dB)

= 1kHz

-0.08

-0.04

0.12

0.08

0.04

0.20

0.16

0.24

0 202 404 606 808 1010

MAX7400/MAX7404 (r = 1.5)

PASSBAND FREQUENCY RESPONSE

MAX7400/03-02

INPUT FREQUENCY (Hz)

GAIN (dB)

= 1kHz

-640

-480

-560

-240

-320

-400

-80

-160

0 300 600 900 1200 1500

MAX7400/MAX7404 (r = 1.5)

PHASE RESPONSE

MAX7400/03-03

INPUT FREQUENCY (Hz)

PHASE SHIFT (DEGREES)

= 1kHz

PARAMETER MIN TYP MAX UNITS

-58 -50

-60 -54

Insertion Gain Relative to DC Gain

(Note 5)

-60 -54

= 1.533f

= 2.875f

-59 -54

= 1.200f

= 1.261f

-0.20 0.10 0.20

-0.20 0.14 0.30

CONDITIONS

-0.20 0.09 0.30

= 0.992f

= 1.000f

-0.20 0.02 0.20

= 0.902f

= 0.956f

-0.20 0.02 0.20

-0.20 -0.06 0.20

= 0.640f

= 0.784f

-0.20 -0.11 0.20f

= 0.408f

MAX7400/MAX7403/MAX7404/MAX7407

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

Switched-Capacitor Filters 1

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