Dual Universal Switched-Capacitor Filters

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX7490

(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.

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

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

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

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

Mode 1

0.001 to

40

kHz

Clock-to-Center Frequency

Accuracy

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%

±1

ppm/

°C

Q Temperature Coefficient

±5

ppm/

°C

DC Lowpass Gain Accuracy

Mode 1, R1 = R2 = 10k

Ω±0.1

±0.5

%

DC offset of input inverter

±3

±12.5

DC offset of 1st integrator

±4

±15

DC Offset Voltage (Figure 8)

DC offset of 2nd integrator

±4

±30

mV

Crosstalk (Note 2)

-60

dB

Input: COM externally driven

- 0.5

+ 0.5

COM Voltage Range

Output: COM internally driven

- 0.2

+ 0.2

V

Input Resistance at COM

140

250

325

k

Ω

Clock Feedthrough

200

Noise (Note 3)

Mode 1, R1 = R2 = R3 =10k

Ω, LP output,

Q = 1

60

Output Voltage Swing

0.2

V

Input Leakage Current at COM

±0.1

±10

μA

CLOCK

Maximum Clock Frequency

4

MHz

95

135

175

kHz

Internal Oscillator Frequency

(Note 4)

1.35

MHz

Clock Input High

V