ELECTRICAL CHARACTERISTCS (Continued)

STAND-BY FUNCTION

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Pin 5 DC Voltage

Mute SW Open (play)

6.4

V

Pin 5 Current

Mute SW Closed (st-by)

160

280

µA

Stand-by Attenuation

f = 100Hz to 10kHz

70

90

dB

Stand-by Threshold (pin 5)

3.8

V

Stand-by Current

1

3

mA

Note (*):

MUSIC POWER CONCEPT

MUSIC POWER is ( according to the IEC clauses n.268-3 of Jan 83) the maximal power which the amplifier is capable of producing across the

rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1KHz.

According to this definition our method of measurement comprises the following steps:

1) Set the voltage supply at the maximum operating value -20%

2) Apply a input signal in the form of a 1KHz tone burst of 1 sec duration; the repetition period of the signal pulses is > 60 sec

3) The output voltage is measured 1 sec from the start of the pulse

4) Increase the input voltage until the output signal show a THD = 10%

5) The music power is then V

2

out

The target of this method is to avoid excessive dissipation in the amplifier.

Figure 2: Schematic Diagram

TDA7245

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