LM4780 datasheet(4/24 Pages) NSC

4 / 24 page

Electrical Characteristics (Notes 1, 2) (Continued)

The following specifications apply for V

+ = +35V, V- = −35V, I

MUTE = -1mA and RL =8

Ω unless otherwise specified. Limits ap-

ply for T

A = 25˚C.

Symbol

Parameter

Conditions

LM4780

Units

(Limits)

Typical

Limit

(Note 6)

(Notes 7, 8)

VOL

Open Loop Voltage Gain

L =2k

Ω, ∆V

O = 40V

115

dB (min)

GBWP

Gain Bandwidth Product

IN = 100kHz, VIN = 50mVRMS

MHz (min)

Input Noise

IHF-A-Weighting Filter,

IN = 600

Ω (Input Referred)

2.0

µV (max)

SNR

Signal-to-Noise Ratio

O =1WRMS; A-Weighted Filter

IN = 1kHz, RS =25

Ω

O = 50WRMS; A-Weighted Filter

IN = 1kHz, RS =25

Ω

114

IMD

Intermodulation Distortion

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

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

0.004

0.009

Note 1: All voltages are measured with respect to the ground pins, 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 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 3: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by TJMAX, θJC, and the ambient temperature TA. The maximum

allowable power dissipation is PDMAX =(TJMAX -TA)/θJC or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4780, TJMAX = 150˚C

and the typical

θJC is 0.8˚C/W. Refer to the Thermal Considerations section for more information.

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

Ω resistor.

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

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

Note 7: Tested 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: The maximum operating junction temperature is 150˚C. However, the instantaneous Safe Operating Area temperature is 250˚C.

Note 10: V- must have at least - 9V at its pin with reference to GND in order for the under-voltage protection circuitry to be disabled. In addition, the voltage

differential between V+ and V- must be greater than 14V.

Note 11: Cross talk performance was measured using the demo board shown in the datasheet. PCB layout will affect cross talk. It is recommended that input and

output traces be separated by as much distance as possible. Return ground traces from outputs should be independent back to a single ground point and useas

wide of traces as possible.

Note 12: The output dropout voltage is defined as the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs. Supply Voltage graph in the

Typical Performance Characteristics section.

Note 13: The Differential Input Voltage Absolute Maximum Rating is based on supply voltages V+ = 40V and V- = - 40V.

Note 14: The TA27A is a non-isolated package. The package’s metal back, and any heat sink to which it is mounted are connected to the V- potential when 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 electrically isolated from

V-.

Note 15: DC electrical test.

Note 16: CCIR/ARM: A Practical Noise Measurement Method; by Ray Dolby, David Robinson and Kenneth Gundry, AES Preprint No. 1353 (F-3).

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