MF4 datasheet(5/14 Pages) NSC | MF4 4th Order Switched Capacitor Butterworth Lowpass Filter

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Logic Input-Output Characteristics (Continued)

The following specifications apply for V

− = 0V (Note 7) unless otherwise specified. Boldface limits apply for T

MIN to TMAX; all

other limits T

A = TJ = 25˚C.

Typical

Tested

Design

Parameter

Conditions

(Note 10)

Limit

Unit

(Note 11)

(Note 12)

TTL CLOCK INPUT, CLK R PIN (Note 9)

Maximum V

IL, Logical “0” Input Voltage

0.8

Minimum V

IH, Logical “1” Input Voltage

2.0

Maximum Leakage Current at CLK R Pin

L. Sh Pin at Mid-Supply

2.0

µA

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. AC and DC electrical specifications do not apply when operating

the device beyond its specified operating conditions.

Note 2: All voltages are with respect to GND.

Note 3: The cutoff frequency of the filter is defined as the frequency where the magnitude response is 3.01 dB less than the DC gain of the filter.

Note 4: For ±5V supplies the dynamic range is referenced to 2.82 Vrms (4V peak) where the wideband noise over a 20 kHz bandwidth is typically 280 µVrms for

the MF4-50. For ±2.5V supplies the dynamic range is referenced to 1.06 Vrms (1.5V peak) where the wideband noise over a 20 kHz bandwidth is typically 130 µVrms.

Note 5: The specifications for the MF4 have been given for a clock frequency (fCLK) of 250 kHz or less. Above the clock frequency the cutoff frequency begins to

deviate from the specified error band of ±0.6% but the filter still maintains its magnitude characteristics. See Application Hints.

Note 6: Besides checking the cutoff frequency (fc) and the stopband attenuation at 2 fc, two additional frequencies are used to check the magnitude response of the

filter. The magnitudes are referenced to a DC gain of 0.0 dB.

Note 7: For simplicity all the logic levels have been referenced to V− = 0V (except for the TTL input logic levels). The logic levels will scale accordingly for ±5V and

±2.5V supplies.

Note 8: The short circuit source current is measured by forcing the output that is being tested to its maximum positive voltage swing and then shorting that output

to the negative supply. The short circuit sink current is measured by forcing the output that is being tested to its maximum negative voltage and then shorting that

output to the positive supply. These are worst case conditions.

Note 9: The MF4 is operating with symmetrical split supplies and L. Sh is tied to ground.

Note 10: Typicals are at 25˚C and represent most likely parametric norm.

Note 11: Guaranteed to National’s Average Outgoing Quality Level (AOQL).

Note 12: Guaranteed, but not 100% production tested. These limits are not used to determine outgoing quality levels.

Note 13: Human body model; 100 pF discharged through a 1.5 k

Ω resistor.

Note 14: When the input voltage (VIN) at any pin exceeds the power supply rails (VIN < V

−or V

IN > V

+) the absolute value of current at that pin should be limited

to 5 mA or less. The 20 mA package input current limits the number of pins that can exceed the power supply boundaries witha5mA current limit to four.

Note 15: Thermal Resistance

θJA (Junction to Ambient) N Package: 105˚C/W.

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