MAX7421 datasheet(3/14 Pages) MAXIM

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5th-Order, Lowpass,

Switched-Capacitor Filters

_______________________________________________________________________________________

Corner-Frequency Range

0.001 to 45

5th-Order, Lowpass,

Switched-Capacitor Filters

ELECTRICAL CHARACTERISTICS—MAX7418–MAX7421 (continued)

(VDD = +5V, filter output measured at OUT, 10k

Ω || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,

SHDN = VDD, fCLK = 2.2MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

ELECTRICAL CHARACTERISTICS—MAX7422–MAX7425

(VDD = +3V, filter output measured at OUT pin, 10k

Ω || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND,

SHDN = VDD, fCLK = 2.2MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

FILTER CHARACTERISTICS

0.001 to 45

MAX7423/MAX7424

MAX7422/MAX7425

-0.2

+0.2

MAX7423/MAX7424

MAX7422/MAX7425

UNITS

kHz

ppm/°C

V/V

Ω

mVp-p

Ω

µA

PARAMETER

SYMBOL

MIN

TYP

MAX

DC Insertion Gain with Output

Offset Removed

0.2

0.4

Output Offset Voltage

VOFFSET

±4

±25

Output Voltage Range

0.25

VDD - 0.25

Clock-to-Corner Tempco

Offset Voltage Gain

AOS

VCOM

Clock-to-Corner Ratio

fCLK/fC

100:1

Input Voltage Range at OS

VOS

VCOM ±0.1

Input Resistance at COM

RCOM

100

140

Clock Feedthrough

Resistive Output Load Drive

500

Input Leakage Current at COM

±0.1

±10

Input Leakage Current at OS

±0.1

±10

CONDITIONS

VCOM = VDD / 2

(Note 2)

VIN = VCOM = VDD / 2

Measured with respect to COM

OS to OUT

VIN = 2.5Vp-p

(Note 1)

SHDN = GND, VCOM = 0 to VDD

VOS = 0 to VDD

Maximum Capacitive Load

at OUT

-81

MAX7423

MAX7422

-80

MAX7425

MAX7424

Total Harmonic Distortion plus

Noise

THD+N

-70

fIN = 2kHz,

VIN = 2.5Vp-p,

measurement

bandwidth = 80kHz

1.4

1.5

1.6

Input, COM externally driven

COM Voltage Range

1.4

1.5

1.6

Output, COM internally driven

FILTER CHARACTERISTICS

SHUTDOWN

POWER REQUIREMENTS

3.4

4.1

MAX7419/MAX7420

MAX7418/MAX7421

µA

±0.2

±10

V SHDN = 0 to VDD

SHDN Input Leakage Current

UNITS

µA

Supply Voltage

VDD

4.5

5.5

IDD

Supply Current

2.9

3.6

Shutdown Current

I SHDN

0.2

Power-Supply Rejection Ratio

PSRR

SHDN Input High

VSDH

4.5

SHDN Input Low

VSDL

0.5

Operating mode,

no load

SHDN = GND

IN = COM (Note 4)

PARAMETER

SYMBOL

MIN

TYP

MAX

CONDITIONS

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