UDA1343TT 데이터 시트보기 (PDF) - Philips Electronics

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UDA1343TT

Economy audio CODEC with features

Philips Electronics 

Philips Semiconductors

Economy audio CODEC with features

Preliminary specification

UDA1343TT

Digital output signal

The output to the digital output of the UDA1343TT can be

selected from 3 positions, using the two bits ADC_OUT

select in the L3 microcontroller interface. The 3 positions

are as follows:

• Directly from the ADC and decimator (default)

• After volume control and mute in the ADC data path

• After the digital mixer and before master volume control

and mute. It should be noted that this output is before

the +6 dB gain. This is done in order to prevent clipping

at the mixer output at all times.

Noise shaper (DAC)

The 3rd-order noise shaper operates at 128fs. It shifts

in-band quantization noise to frequencies well above the

audio band. This noise shaping technique enables high

signal-to-noise ratios to be achieved. The noise shaper

output is converted into an analog signal using a Filter

Stream Digital-to-Analog Converter (FSDAC).

In this way very high signal-to-noise performance and low

clock jitter sensitivity is achieved. A post-filter is not

needed due to the inherent filter function of the DAC.

On-board amplifiers convert the FSDAC output current to

an output voltage signal capable of driving a line output.

The output voltage of the FSDAC scales proportionally

with the power supply voltage.

Multiple format input/output audio interface

The digital audio interface supports multiple standards:

• I2S-bus with data word length of up to 24 bits

• MSB-justified serial format with data word length of up to

24 bits

• LSB-justified data formats with word lengths of 16, 18,

20 and 24 bits.

• Four combined data formats with MSB data output

and 16, 18, 20 and 24 LSB data input.

The digital audio interface formats are illustrated in Fig.5.

The Filter Stream DAC (FSDAC)

The FSDAC is a semi-digital reconstruction filter that

converts the 1-bit data stream of the noise shaper to an

analog output voltage. The filter coefficients are

implemented as current sources and are summed at

virtual ground of the output operational amplifier.

2000 Jan 12

10

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