LM4936 datasheet(5/28 Pages) NSC

5 / 28 page

Electrical Characteristics for Bridged Mode Operation (Notes 7, 10) (Continued)

The following specifications apply for V

DD = 5V, unless otherwise noted. Limits apply for TA = 25˚C.

Symbol

Parameter

Conditions

LM4936

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

OUT

Output Noise

A-Wtd Filter

µV

talk

Channel Separation (Note 17)

f = 1kHz, C

B = 1µF

Note 3: The

θJA given is for an MXA28A package whose exposed-DAP is soldered to an exposed 2in 2 piece of 1 ounce printed circuit board copper.

Note 4: The

θJA given is for an MXA28A package whose exposed-DAP is soldered to a 2in2 piece of 1 ounce printed circuit board copper on a bottom side layer

through 21 8mil vias.

Note 5: The

θJA given is for an MXA28A package whose exposed-DAP is soldered to an exposed 1in 2 piece of 1 ounce printed circuit board copper.

Note 6: The

θJA given is for an MXA28A package whose exposed-DAP is not soldered to any copper.

Note 7: All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown

in Figure 1.

Note 8: When driving 3

Ω loads from a 5V supply the LM4936MH must be mounted to the circuit board and forced-air cooled. The demo board shown in the

datasheet has planes for heat sinking. The top layer plane is 1.05 in2 (675mm2), the inner two layers each have a 1.03 in2 (667mm2) plane and the bottom layer

has a 3.32 in2 (2143mm2) plane. The planes are electrically GND and interconnected through six 15 mil vias directly under the package and eight 28 mil vias in

various locations.

Note 9: When driving 4

Ω loads from a 5V supply the LM4936MH must be mounted to the circuit board. The demo board shown in the datasheet has planes for heat

sinking. The top layer plane is 1.05 in2 (675mm2), the inner two layers each have a 1.03 in2 (667mm2) plane and the bottom layer has a 3.32 in2 (2143mm2) plane.

The planes are electrically GND and interconnected through six 15 mil vias directly under the package and eight 28 mil vias in various locations.

Note 10: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which

guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit

is given, however, the typical value is a good indication of device performance.

Note 11: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θ JA, and the ambient temperature TA. The maximum

allowable power dissipation is PDMAX =(TJMAX −TA )/θJA. For the LM4936, TJMAX = 150˚C, and the typical junction-to-ambient thermal resistance for each package

can be found in the Absolute Maximum Ratings section above.

Note 12: Human body model, 100pF discharged through a 1.5k

Ω resistor.

Note 13: Machine Model, 220pF – 240pF discharged through all pins.

Note 14: Typicals are measured at 25˚C and represent the parametric norm.

Note 15: Limits are guaranteed to National’s AOQL ( Average Outgoing Quality Level). Datasheet min/max specification limits are guaranteed by design, test, or

statistical analysis.

Note 16: I2C/SPI VDD must not be larger than VDD at any time or damage to the IC may occur. During power up and power down, I

2C/SPI V

DD must remain equal

to VDD or lower.

Note 17: PCB design will affect Crosstalk performance.

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