Details

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BUY TFA9843J https://www.utsource.net/itm/p/9137415.html

Parameter	Description	Min	Typ	Max	Unit
Supply Voltage (VDD)	Operating supply voltage	2.7	-	5.5	V
Quiescent Current	Current consumption in active mode	-	8	-	mA
Shutdown Current	Current consumption in shutdown mode	-	0.1	-	μA
Output Power	Maximum output power into 4Ω speaker	-	3.2	-	W
THD+N	Total harmonic distortion plus noise at 1W, 4Ω	-	0.05	-	%
SNR	Signal-to-noise ratio	-	105	-	dB
PSRR	Power supply rejection ratio at 217 Hz	-	80	-	dB
Operating Temperature	Ambient operating temperature range	-40	-	85	°C

Instructions for TFA9843J

1. Power Supply:

   • Ensure the supply voltage (VDD) is within the specified range of 2.7V to 5.5V.
   • Use appropriate decoupling capacitors close to the power pins to stabilize the power supply.

2. Speaker Connection:

   • Connect a 4Ω speaker for optimal performance.
   • Verify that the maximum output power does not exceed 3.2W to prevent damage to the device or speaker.

3. Signal Input:

   • Apply audio signals with proper amplitude and ensure they are compatible with the input stage of the amplifier.
   • Check impedance matching between the signal source and the amplifier input.

4. Thermal Management:

   • Monitor the operating temperature to stay within the -40°C to 85°C range.
   • Consider heat sinking if continuous high-power operation is expected.

5. Power-Up/Down Sequence:

   • Follow the recommended power-up and power-down sequences to avoid pop sounds or potential damage.
   • Ensure the device is properly initialized before applying any audio signals.

6. Shutdown Mode:

   • To minimize power consumption, use the shutdown feature when the device is not in use.
   • The shutdown current is very low, typically around 0.1μA.

7. Noise Performance:

   • Keep the total harmonic distortion plus noise (THD+N) below 0.05% for high-quality audio reproduction.
   • Maintain a signal-to-noise ratio (SNR) of at least 105dB for clear sound output.

8. Power Supply Rejection Ratio (PSRR):

   • Ensure the power supply rejection ratio remains above 80dB at 217Hz to reduce the impact of power supply noise on audio quality.

(For reference only)