MAX7421 datasheet(5/14 Pages) MAXIM

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5th-Order, Lowpass,

Switched-Capacitor Filters

_______________________________________________________________________________________

Note 1: The maximum fC is defined as the clock frequency fCLK = 100 x fC at which the peak S / (THD+N) drops to 68dB with a

sinusoidal input at 0.2fC. Maximum fC increases as VIN signal amplitude decreases.

Note 2: DC insertion gain is defined as

∆VOUT / ∆VIN.

Note 3: MAX7418/MAX7421/MAX7422/MAX7425: fOSC (kHz)

≅ 87x103 / COSC (pF).

MAX7419/MAX7420/MAX7423/MAX7424: fOSC (kHz)

≅ 110x103 / COSC (pF).

Note 4: PSRR is the change in output voltage from a VDD of 4.5V and a VDD of 5.5V.

-70

-65

fIN = 5fC

-47.5

-43

-3.6

-3.0

-2.4

fIN = fC

fIN = 3fC

-0.3

fIN = 0.5fC

PARAMETER

MIN

TYP

MAX

UNITS

CONDITIONS

BUTTERWORTH FILTERS—MAX7420/MAX7424

FILTER CHARACTERISTICS

(VDD = +5V for MAX7418–MAX7421, VDD = +3V for MAX7422–MAX7425 filter output measured at OUT, 10k

Ω || 50pF load to GND at

OUT, SHDN = VDD, fCLK = 2.2MHz, TA = TMIN to TMAX, unless otherwise noted.)

__________________________________________Typical Operating Characteristics

(VDD = +5V for MAX7418–MAX7421, VDD = +3V for MAX7422–MAX7425, fCLK = 2.2MHz, SHDN = VDD, VCOM = VOS = VDD / 2,

TA = +25°C, unless otherwise noted.)

-90

-60

-70

-80

-50

-40

-30

-20

-10

040

100

MAX7418/MAX7422

FREQUENCY RESPONSE (ELLIPTIC, r = 1.6)

INPUT FREQUENCY (kHz)

-60

-40

-50

-20

-30

-10

040

100

MAX7419/MAX7423

FREQUENCY RESPONSE (BESSEL)

INPUT FREQUENCY (kHz)

-80

-60

-70

-30

-40

-50

-10

-20

040

100

MAX7420/MAX7424

FREQUENCY RESPONSE (BUTTERWORTH)

INPUT FREQUENCY (kHz)

Insertion Gain Relative to

DC Gain

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