Dual Universal Switched-Capacitor Filters

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX7490

(VDD = VEXTCLK = +5V; fCLK = 625kHz; 10kΩ || 50pF load to VDD/2 at LP_, BP_, and N_/HP_; VSHDN = VDD; 0.1µF from COM to

GND; 50% duty-cycle clock input; COM = VDD/2; TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.)

(Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

VDD to GND ..............................................................-0.3V to +6V

EXTCLK, SHDN to GND ...........................................-0.3V to +6V

INV_, LP_, BP_, N_/HP_, S_, COM,

CLK to GND............................................-0.3V to (VDD + 0.3V)

Maximum Current into Any Pin ...........................................50mA

Continuous Power Dissipation (TA = +70°C)

16-Pin QSOP (derate 8.30mW/°C above +70°C).........667mW

Operating Temperature Range

MAX749_CEE .....................................................0°C to +70°C

MAX749_EEE ...................................................-40°C to +85°C

Die Temperature ..............................................................+150°C

Storage Temperature.........................................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

FILTER

Center Frequency Range

fO

Mode 1

0.001 to

40

kHz

Clock-to-Center Frequency

Accuracy

fCLK/fO

Mode 1, R1 = R3 = 50k

Ω , R2 = 10kΩ,

Q = 5, deviation from 100:1

±0.2

±0.7

%

Q Accuracy

Mode 1, R1 = R3 = 50k

Ω, R2 = 10kΩ, Q = 5

±0.2

±2%

fO Temperature Coefficient

±1

ppm/

°C

Q Temperature Coefficient

±5

ppm/

°C

DC Lowpass Gain Accuracy

Mode 1, R1 = R2 = 10k

Ω±0.1

±0.5

%

VOS1

DC offset of input inverter

±3

±12.5

VOS2

DC offset of 1st integrator

±4

±15

DC Offset Voltage (Figure 8)

VOS3

DC offset of 2nd integrator

±4

±30

mV

Crosstalk (Note 2)

fIN = 10kHz

-60

dB

Input: COM externally driven

VDD/2

- 0.5

VDD/2

VDD/2

+ 0.5

COM Voltage Range

VCOM

Output: COM internally driven

VDD/2

- 0.2

VDD/2

VDD/2

+ 0.2

V

Input Resistance at COM

RCOM

140

250

325

k

Ω

Clock Feedthrough

Up to 5th harmonic of fCLK

200

μVRMS

Noise (Note 3)

Mode 1, R1 = R2 = R3 =10k

Ω, LP output,

Q = 1

60

μVRMS

Output Voltage Swing

0.2

VDD - 0.2

V

Input Leakage Current at COM

SHDN = GND, VCOM = 0 to VDD

±0.1

±10

μA

CLOCK

Maximum Clock Frequency

fCLK

4

MHz

EXTCLK = GND, COSC = 1000pF

95

135

175

kHz

Internal Oscillator Frequency

(Note 4)

fOSC

EXTCLK = GND, COSC = 100pF

1.35

MHz

Clock Input High

VDD - 0.5

V