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MAX7426

5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

Maxim Integrated 

5th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

ELECTRICAL CHARACTERISTICS—MAX7427 (continued)

(VDD = +3V, filter output measured at OUT pin, 10kΩ || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1µF from COM to

GND, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

CLOCK

Internal Oscillator Frequency

SYMBOL

CONDITIONS

fOSC COSC = 1000pF (Note 3)

MIN

TYP MAX UNITS

13.5

17.5

21.5

kHz

Clock Output Current

(internal oscillator mode)

ICLK VCLK = 0 or 3V

±7.5 ±12.5

µA

Clock Input High

Clock Input Low

POWER REQUIREMENTS

Supply Voltage

Supply Current

Shutdown Current

Power-Supply Rejection Ratio

SHUTDOWN

SHDN Input High

SHDN Input Low

SHDN Input Leakage Current

VIH

VIL

VDD

IDD

ISHDN

PSRR

Operating mode, no load

SHDN = GND

Measured at DC

VSDH

VSDL

V SHDN = 0 to VDD

2.5

V

0.5

V

2.7

3.6

V

0.75

1.0

mA

0.2

1

µA

70

dB

2.5

V

0.5

V

±0.2

±10

µA

ELLIPTIC FILTER CHARACTERISTICS (r = 1.25)

(VDD = +5V for MAX7426, VDD = +3V for MAX7427, 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.) (Note 3)

PARAMETER

Insertion Gain

with DC Gain Error Removed

(Note 4)

fIN = 0.38fC

fIN = 0.68fC

fIN = 0.87fC

fIN = 0.97fC

fIN = fC

fIN = 1.25fC

fIN = 1.43fC

fIN = 3.25fC

CONDITIONS

MIN

TYP MAX UNITS

-0.4

-0.2

0.4

-0.4

0.2

0.4

-0.4

-0.2

0.4

-0.4

0.2

0.4

dB

-0.7

-0.2

0.2

-38.5

-34

-37.2

-35

-37.2

-35

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

soidal input at 0.2fC.

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

Note 3: fOSC (kHz) ≈ 17.5 ✕ 103 / COSC (COSC in pF).

Note 4: The input frequencies, fIN, are selected at the peaks and troughs of the ideal elliptic frequency responses.

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