SAA7712 datasheet(11/44 Pages) PHILIPS

Part #	SAA7712

Description	Sound effects DSP

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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11 / 44 page

1999 Aug 05

11

Philips Semiconductors

Preliminary speciﬁcation

Sound effects DSP

SAA7712H

8

FUNCTIONAL DESCRIPTION

8.1

Analog outputs

8.1.1

ANALOG OUTPUT CIRCUIT

Depending on the configuration of the equalizer sections,

the SAA7712H has 2 or 4 analog outputs which are

supplied by the same power supply. Each of these outputs

has a voltage and a current pin (see Fig.3). The signals are

available on 2 outputs (OUT0 and OUT1), or 4 outputs

(OUT0, OUT1, OUT2 and OUT3).

8.1.2

DAC FREQUENCY

The sample rate (fs) of the selected source is the frame

rate of the DSP. The word clock for the upsample filter and

the clock for the DACs, at 4fs, are derived internally from

the word select of the selected audio source.

Fig.3 Analog output circuit.

handbook, halfpage

MGS208

BIT 0 to 13

MSB

Vref

DAC

OUT0_V

(OUT1_V)

OUT0_I

(OUT1_I)

8.1.3

DACS

Each of the four low noise high dynamic range DACs

consists of a signed-magnitude DAC with current output,

followed by a buffer operational amplifier.

8.1.4

UPSAMPLE FILTER

To reduce spectral components above the audio band, a

fixed 4 times oversampling and interpolating digital filter is

used. The filters give an out-of-audio-band attenuation of

at least 29 dB. The filter is followed by a first-order noise

shaper to expand the dynamic range to more than 105 dB.

The band around multiples of the sample frequency of the

DAC (4fs) is not affected by the digital filter. A capacitor

must be added in parallel with the DAC output amplifier to

attenuate this out-of-band noise further to an acceptable

level.

In Fig.4 the overall frequency spectrum at the DAC audio

output without external capacitor or low-pass filter for the

audio sampling frequencies of 38 kHz is shown. In Fig.5

the detailed spectrum around fs is shown for an fs of

38, 44.1 and 48 kHz. The pass band bandwidth (

−3 dB) is

1

⁄2fs.

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SAA7712 Datasheet(PDF) 11 Page - NXP Semiconductors

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