UDA1340M/N1 Просмотр технического описания (PDF) - Philips Electronics

Номер в каталоге

Компоненты Описание

производитель

UDA1340M/N1

Low-voltage low-power stereo audio CODEC with DSP features

Philips Electronics 

Philips Semiconductors

Low-voltage low-power stereo audio

CODEC with DSP features

Preliminary specification

UDA1340

Interpolation filter (DAC)

The digital filter interpolates from 1fs to 128fs by means of

a cascade of a recursive filter and an FIR filter.

Table 3 Interpolation filter characteristics

ITEM

Passband ripple

Stop band

Dynamic range

Gain

CONDITION

0 − 0.45fs

>0.55fs

0 − 0.45fs

DC

VALUE (dB)

±0.03

−50

108

−3.5

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. 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.

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.

1997 Jul 09

7

Share Link: