LM2876TF datasheet(4/19 Pages) NSC

4 / 19 page

Electrical Characteristics (Notes 4, 5) (Continued)

The following specifications apply for V

+ = +30V, V− = −30V, I

MUTE = −0.5 mA with RL = 8Ω unless otherwise specified. Limits

apply for T

A = 25˚C.

Symbol

Parameter

Conditions

LM2876

Units

(Limits)

Typical

Limit

(Note 9) (Note 10)

eIN

(Note 3)

Input Noise

IHF — A Weighting Filter

2.0

µV (max)

IN = 600Ω (Input Referred)

SNR

Signal-to-Noise Ratio

O = 1W, A-Weighted,

Measured at 1 kHz, R

S = 25Ω

O = 25W, A-Weighted,

112

Measured at 1 kHz, R

S = 25Ω

Ppk= 75W, A-Weighted,

117

Measured at 1 kHz, R

S = 25Ω

IMD

Intermodulation Distortion Test

60 Hz, 7 kHz, 4:1 (SMPTE)

0.004

60 Hz, 7 kHz, 1:1 (SMPTE)

0.006

Note 2: DC Electrical Test; refer to Test Circuit #1.

Note 3: AC Electrical Test; refer to Test Circuit #2.

Note 4: All voltages are measured with respect to the GND pin (pin 7), unless otherwise specified.

Note 5: 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 6: For operating at case temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance of

θJC = 1.0 ˚C/W (junction to case). Refer to the Thermal Resistance figure in the Application Information section under Thermal Considerations.

Note 7: Human body model, 100 pF discharged through a 1.5 k

Ω resistor.

Note 8: The operating junction temperature maximum is 150˚C, however, the instantaneous Safe Operating Area temperature is 250˚C.

Note 9: Typicals are measured at 25˚C and represent the parametric norm.

Note 10: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 11: The LM2876T package TA11B is a non-isolated package, setting the tab of the device and the heat sink at V− potential when the LM2876 is directly

mounted to the heat sink using only thermal compound. If a mica washer is used in addition to thermal compound,

θCS (case to sink) is increased, but the heat sink

will be isolated from V−.

Note 12: The feedback compensation network limits the bandwidth of the closed-loop response and so the slew rate will be reduced due to the high frequency

roll-off. Without feedback compensation, the slew rate is typically larger.

Note 13: V− must have at least −9V at its pin with reference to ground in order for the under-voltage protection circuitry to be disabled.

Note 14: The output dropout voltage is the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs Supply Voltage graph in the Typical Perfor-

mance Characteristics section.

Test Circuit #1 (DC Electrical Test Circuit)

DS011775-3

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