TS4604 datasheet(26/31 Pages) STMICROELECTRONICS

26 / 31 page

Application information

TS4604

26/31

Doc ID 17913 Rev 1

With a gain set at G = 0 dB, a Rin = 10 k

Ω and Cin = 2.2 µF, to charge Cin to 95% of its final

value, 66 ms are necessary.

Wake-up time of the TS4604

The TS4604 needs 30 ms to become fully operational (see Table 5 and Table 6).

The total startup sequence with the settings described being 66 ms, and since the TS4604

needs 30 ms to wake up, the Enable pin for the line driver and/or headphone can be set high

36 ms after the power supply has reached its normal value (Figure 55).

With a lower input capacitance, the startup phase is quicker.

Figure 55.

Power-up/down sequence

6.13

Layout recommendations

Particular attention must be given to the correct layout of the PCB traces and wires between

the amplifier, load and power supply.

The power and ground traces are critical since they must provide adequate energy and

grounding for all circuits. Good practice is to use short and wide PCB traces to minimize

voltage drops and parasitic inductance.

Proper grounding guidelines help improve audio performances, minimize crosstalk between

channels, and prevent switching noise from coupling into the audio signal. It is also

recommended to use a large-area and multi-via ground plane to minimize parasitic

impedance.

Connect all the VCC tracks (PVCCLD and PVCCHP) to one point one the board.

The copper traces that connect the output pins to the load and supply pins should be as

wide as possible to minimize the trace resistances.

The gain setting resistors must be placed as close as possible to the input in order to

minimize the parasitic capacitors on these inputs pins.

Supply

EN_xx

36 ms

Vout

30 ms

Supply ramp

66 ms

AM06148

TS4604 Datasheet(PDF) 26 Page - STMicroelectronics