MAX7400 Просмотр технического описания (PDF) - Maxim Integrated

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MAX7400

8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

Maxim Integrated 

8th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

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

(VDD = +5V for MAX7403, VDD = +3V for MAX7407; filter output measured at OUT; 10kΩ || 50pF load to GND at OUT; SHDN = VDD;

VCOM = VOS = VDD / 2; fCLK = 100kHz; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Insertion Gain Relative to DC Gain

(Note 5)

fIN = 0.408fC

fIN = 0.640fC

fIN = 0.784fC

fIN = 0.902fC

fIN = 0.956fC

fIN = 0.992fC

fIN = 1.000fC

fIN = 1.200fC

fIN = 1.261fC

fIN = 1.533fC

fIN = 2.875fC

-0.20 -0.11 0.20

-0.20 0.02 0.20

-0.20 -0.06 0.20

-0.20 0.10 0.20

-0.20 0.02 0.20

-0.20 0.14 0.30

dB

-0.20 0.09 0.30

-58

-50

-59

-54

-60

-54

-60

-54

Note 1: The maximum fC is defined as the clock frequency, fCLK = 100 · fC, at which the peak SINAD drops to 68dB with a

sinusoidal input at 0.2fC.

Note 2: DC insertion gain is defined as ∆VOUT / ∆VIN.

Note 3: OS voltages above VDD - 1V saturate the input and result in a 75µA typical input leakage current.

Note 4: For MAX7400/MAX7403, fOSC (kHz) ≅ 38 · 103 / COSC (pF). For MAX7404/MAX7407, fOSC (kHz) ≅ 34 · 103 / COSC (pF).

Note 5: The input frequencies, fIN, are selected at the peaks and troughs of the frequency responses.

Typical Operating Characteristics

(VDD = +5V for MAX7400/MAX7403, VDD = +3V for MAX7404/MAX7407; VCOM = VOS = VDD / 2; SHDN = VDD; fCLK = 100kHz;

TA = +25°C; unless otherwise noted.)

20

0

-20

-40

-60

-80

-100

-120

0

MAX7400/MAX7404 (r = 1.5)

FREQUENCY RESPONSE

fC = 1kHz

1

2

3

4

5

INPUT FREQUENCY (kHz)

MAX7400/MAX7404 (r = 1.5)

PASSBAND FREQUENCY RESPONSE

0.24

fC = 1kHz

0.20

0.16

0.12

0.08

0.04

0

-0.04

-0.08

0

202 404 606 808 1010

INPUT FREQUENCY (Hz)

0

-80

-160

-240

-320

-400

-480

-560

-640

0

MAX7400/MAX7404 (r = 1.5)

PHASE RESPONSE

fC = 1kHz

300 600 900 1200 1500

INPUT FREQUENCY (Hz)

_______________________________________________________________________________________ 5

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