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3. TECHNICAL BRIEF
DIGITAL EQUALIZER SECTION
This is a digital equalizer. Voice of signals from the Hybrid Synthesizer section and voice of digital audio
signals are adjusted.
DVX ARITHMETIC CONTROL
Two-channel virtual speaker image function that is based on DVX technology makes it possible to create
natural stereo sound under the two closely spaced speakers.
OVER SAMPLING FILTER
4 Times of over sampling filter. It converts a signal of sampling frequency 48Khz into a signal of
192Khz,and then send to DAC
GENERAL PARALLEL I/O PORT SECTION(GPIO)
There are six general parallel I/O ports. It is possible to read and write from the Intermediate register.
CLOCK GENERATING BLOCK
This device supports a clock input ranging from 1.5Mhz to 27Mhz.
It is a block to generate a clock which is needed inside of LSI in the PLL.
MIXER SECTION
Selection of an input source(DAC output, RXIN, and EXTIN) against each analog output(SPOUT,
HPOUT,EXTOUT,TXOUT) and mixing are performed.
EQ AMPLIFIER SECTION
The change of filter characteristic and gain is possible by adjusting the resistors and external parts.
SPEAKER AMPLIFIER SECTION
The two digital speakers amplifier, which has a maximum output power of 500mW at SPVDDL/R=3.6V
and RL=8ohm, is integrated in this device. There is a volume to adjust output level in the first stage of
amplifier.
HEADPHONE AMPLIFIER SECTION(HPOUT)
This is an amplifier for stereophonic headphone(RL=16ohm)output.
When it is used as a monaural output, Rch becomes power-down.
In the previous part of it, there are a volume and a bass-boost circuit.
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