MIPSZ2012D3R3 datasheet(32/48 Pages) STMICROELECTRONICS

Part #	MIPSZ2012D3R3

Description	High-performance class-G stereo headphone amplifier with I2C volume control

PDF	48 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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32 / 48 page

Application information

TS4621B

32/48

Doc ID 022194 Rev 2

Figure 76.

Efficiency comparison

Most audio signals have a crest factor higher than 6 dB (10 dB on average), which means

that most of the time the music level is low. In this case, the setting of the internal DC/DC

converters is low (1.2 V) and in this way, helps to minimize the power dissipation.

When the audio signal amplitude increases due to a peak or louder music, the setting of the

internal DC/DC converters increases to 1.9 V, automatically increasing the output dynamic

range. This 1.9 V value remains until the end of the decay time.

Figure 77 shows a music sample played at high levels.

Figure 77.

Class-G operating with a music sample

Note:

HPVDD/PVSS voltages are created internally by DC/DC converters. To avoid destruction of

the TS4621B power amplifier, do not connect any external power supply on these pins.

0.1

100

TS4601

Class AB

TS4621B

Class G

Both channels enabled

RL = 32

Ω, F = 1KHz

Vcc = 3.6V, Ta = 25 C

Crest Factor = 3dB

Total Output Power (mW)

HPVDD

High 1.9V

HPVDD

Low 1.2V

PVSS

Low -1.2V

PVSS

High -1.9V

Music

Sample

MIPSZ2012D3R3 Datasheet(PDF) 32 Page - STMicroelectronics