LM4840LQ datasheet(4/19 Pages) NSC

4 / 19 page

Electrical Characteristics for Single-Ended Mode Operation (Continued)

(Notes 7, 10)

The following specifications apply for V

DD = 5V. Limits apply for TA = 25˚C.

Symbol

Parameter

Conditions

LM4840

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

THD+N

Total Harmonic Distortion+Noise

OUT =1VRMS, f=1kHz, RL = 10kΩ,

VD =1

0.065

PSRR

Power Supply Rejection Ratio

B = 1.0 µF, f =120 Hz,

RIPPLE = 200 mVrms

SNR

Signal to Noise Ratio

OUT =75 mW, R L =32Ω, A-Wtd

Filter

102

talk

Channel Separation

f=1kHz, C

B = 1.0 µF

Electrical Characteristics for Bridged Mode Operation

(Notes 7, 10)

The following specifications apply for V

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

Symbol

Parameter

Conditions

LM4840

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

Output Offset Voltage

IN = 0V, No Load

mV (max)

Output Power

THD+N= 1.0%; f=1kHz; R

L =3Ω

(Note 8)

2.2

THD+N= 1.0%; f=1kHz; R

L =4Ω

(Note 9)

THD = 1.5% (max);f = 1 kHz;

L =8Ω

1.1

1.0

W (min)

THD+N = 10%;f = 1 kHz; R

L =8Ω

1.5

THD+N

Total Harmonic Distortion+Noise

O = 1W, 20 Hz< f < 20 kHz,

L =8Ω,AVD =2

0.3

O = 340 mW, RL =32Ω

1.0

PSRR

Power Supply Rejection Ratio

B = 1.0 µF, f = 120 Hz,

RIPPLE = 200 mVrms; RL =8Ω

SNR

Signal to Noise Ratio

DD = 5V, POUT = 1.1W, RL =8Ω,

A-Wtd Filter

talk

Channel Separation

f=1kHz, C

B = 1.0 µF

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

Figure 1.

Note 8: When driving 3

Ω loads from a 5V supply the LM4840LQ and LM4840MH must be mounted to the circuit board and forced-air cooled.

Note 9: When driving 4

Ω loads from a 5V supply the LM4840LQ and LM4840MH must be mounted to the circuit board.

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. Marshall Chiu feels there are better ways to obtain ’More

Wattage in the Cottage.’ 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 LM4840LQ and LM4840MT, TJMAX = 150˚C, and the typical junction-to-ambient thermal

resistance, when board mounted, is 80˚C/W for the MTC28 package and 42˚C/W for the LM4840LQ package.

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

Ω resistor.

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

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

Note 15: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Note 16: Number given is for an LQA028A package whose exposed-DAP is soldered to an exposed 2.5in2 piece of 1 ounce PCB copper.

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