MC13783 查看數據表（PDF） - Freescale Semiconductor

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MC13783

Power Management and Audio Circuit

Freescale Semiconductor 

Introduction

1.1 Audio

The audio section is composed of microphone amplifiers and speaker amplifiers, a voice CODEC, and a

stereo DAC.

Three microphone amplifiers are available for amplification of two handset microphones and of the

headset microphone. The feedback networks are fully integrated for a current input arrangement. A line

input buffer amplifier is provided for connecting external sources. All microphones have their own

stabilized supply with an integrated microphone sensitivity setting. The microphone supplies can be

disabled. The headset microphone supply has a fully integrated microphone detection.

Several speaker amplifiers are provided. A bridged earpiece amplifier is available to drive an earpiece.

Also, a battery supplied bridged amplifier with thermal protection is included to drive a low ohmic speaker

for speakerphone and alert functionality. The performance of this amplifier allows it to be used as well for

earpiece drive to support applications with a single transducer combining earpiece, speakerphone and alert

functionality, thus avoiding the use of multiple transducers.

A left audio out is provided which in combination with a discrete power amplifier and the integrated

speaker amplifier allows for a stereo speaker application. Two, single-ended amplifiers are included for the

stereo headset drive including headset detection. The stereo headset return path is connected to a phantom

ground which avoids the use of large DC decoupling capacitors. The additional stereo receive signal

outputs can be used for connection to external accessories like a car kit. Via a stereo line in, external

sources such as an FM radio or standalone midi ringer can be applied to the receive path.

A voice CODEC with a dual path ADC is implemented following GSM audio requirements. Both narrow

band and wide band voice is supported. The dual path ADC allows for conversion of two microphone

signal sources at the same time for noise cancellation or stereo applications as well as for stereo recording

from sources like FM radio. A 16-bit stereo DAC is available which supports multi-clock modes. An

on-board PLL ensures proper clock generation. The voice CODEC and the stereo DAC can be operated at

the same time via two interchangeable buses supporting master and slave mode, network mode, as well as

the different protocols like I2S.

Volume control is included in both transmit and receive paths. The latter also includes a balance control

for stereo. The mono adder in the receive path allows for listening to a stereo source on a mono transducer.

The receive paths for stereo and mono are separated to allow the two sources to be played back

simultaneously on different outputs. The different sources can be analog mixed and two sources on the SSI

configured in network mode can be mixed as well.

1.2 Switchers and Regulators

The MC13783 provides most of the telephone reference and supply voltages.

Four down converters and an up converter are included. The down, or buck, converters provide the supply

to the processors and to other low voltage circuits such as IO and memory. The four down converters can

be combined into two higher power converters. Dynamic voltage scaling is provided on each of the down

converters. This allows under close processor control to adapt the output voltage of the converters to

minimize processor current drain. The up, or boost, converter supplies the white backlight LEDs and the

MC13783 Technical Data, Rev. 3.5

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Freescale Semiconductor

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