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TS4601

High performance stereo headphone amplifier with capacitorless outputs and I2C bus interface

STMicroelectronics 

Application information

TS4601

4.3

Wake-up and standby time definition

The wake-up time of the TS4601 is guaranteed at 12 ms typical (refer to Section 3.1:

Electrical characteristics tables on page 6). However, as the TS4601 is activated with an I2C

bus, the wake-up start procedure is as follows:

1. The master sends a start bit

2. The master sends the address.

3. The slave (TS4601) answers by an acknowledge.

4. The master sends the output mode configuration (CR1).

5. If the TS4601 was in I2C standby (mode 1, 6, 7), the wake-up starts on the falling edge

of the eighth clock signal (SCL) corresponding to CR1 byte.

6. 12 ms after (de-pop sequence time), the TS4601 outputs are operational.

The standby time is guaranteed as 10 µs typical (refer to Section 3.1: Electrical

characteristics tables on page 6). However, as the TS4601 is de-activated with an I2C bus,

the standby time operates as follows:

1. The master sends a start bit

2. The master sends the address.

3. The slave (TS4601) answers by an acknowledge.

4. The master sends the output mode configuration (CR1) and in this case it corresponds

to mode 1, 6, 7.

5. The standby time starts on the falling edge of the eighth clock signal (SCL)

corresponding to CR1 byte.

6. After 10 µs, the TS4601 is in standby mode.

4.4

Decoupling considerations

The TS4601 needs two decoupling capacitors for the positive power supply (battery) and

two capacitors for normal operation of the internal negative supply (refer to Figure 1: Typical

application schematics for the TS4601 on page 4). These capacitors must be placed as

close as possible of the TS4601 to minimize parasitic inductance and resistance that have a

negative impact on audio performance.

Two decoupling capacitors (Cs) of 1 µF and low ESR are recommended for positive power

supply decoupling. Packages like the 0402 or 0603 are also recommended because the

placement close to TS4601 is easier. X5R dielectric for capacitor tolerance behavior and

10 V DC rating voltage for 5 V operation or 6.3 V DC rating operation for 3.6 V operation to

take into consideration the ΔC/ΔV variation of this type of dielectric.

Two decoupling capacitors (C12 and Css) of respectively 1 µF and 2.2 µF and low ESR are

recommended for internal negative power supply decoupling. Packages like the 0402 or

0603 are also recommended because the placement close to TS4601 is easier. X5R

dielectric for capacitor tolerance behavior and 10 V DC rating voltage for 5 V operation or

6.3 V DC rating operation for 3.6 V operation to take into consideration the ΔC/ΔV variation

of this type of dielectric.

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