LM4922TL datasheet(5/21 Pages) NSC

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Electrical Characteristics V

DD =3V (Note 1) (Continued)

The following specifications apply for V

DD = 3V and 16

Ω load unless otherwise specified. Limits apply to T

A = 25˚C.

Symbol

Parameter

Conditions

LM4922

Units

(Limits)

Typ

(Note 6)

Limit

(Notes 7, 8)

OUT

Output Impedance

SD-LC =VSD-RC = GND

Input Terminated

Input not terminated

∞

Ω

OUT

Output Impedance

SD-LC =VSD-RC = GND

–500mV

≤ V

OUT

≤ +500mV

(Note 12)

Ω (min)

Input Leakage

±0.1

IN THRESH

Input Voltage Threshold

2.8

mVp

Note 1: All voltages are measured with respect to the GND pin unless otherwise specified.

Note 2: 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 that

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 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum

allowable power dissipation is PDMAX =(TJMAX -TA)/ θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4922, see power

de-rating currents for more information.

Note 4: Human body model, 100pF discharged through a 1.5k

Ω resistor.

Note 5: Machine Model, 220pF - 240pF discharged through all pins.

Note 6: Typicals are measured at 25˚C and represent the parametric norm.

Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Note 9: If the product is in shutdown mode and VDD exceeds 4.2V (to a max of 4.5V VDD), then most of the excess current will flow through the ESD protection

circuits. If the source impedance limits the current to a max of 10mA, then the part will be protected. If the part is enabled when VDD is above 4.5V, circuit

performance will be curtailed or the part may be permanently damaged.

Note 10: Human body model, 100pF discharged through a 1.5k

Ω resistor.

Note 11:

θJA value is measured with the device mounted on a PCB with a 3” x 1.5”, 1oz copper heatsink.

Note 12: VOUT refers to signal applied to the LM4922 outputs.

External Components Description (Figure 1)

Components

Functional Description

Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a

high-pass filter with R

i at fC = 1/(2

πR

iCi). Refer to the section Proper Selection of External Components, for

an explanation of how to determine the value of C

Flying capacitor. Low ESR ceramic capacitor (

≤100mΩ)

Output capacitor. Low ESR ceramic capacitor (

≤100mΩ)

Tantalum capacitor. Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply

Bypassing section for information concerning proper placement and selection of the supply bypass capacitor.

Ceramic capacitor. Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply

Bypassing section for information concerning proper placement and selection of the supply bypass capacitor.

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