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PDF TDA1306T Data sheet ( Hoja de datos )
| Número de pieza | TDA1306T | |
| Descripción | Noise shaping filter DAC | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
TDA1306T
Noise shaping filter DAC
Product specification
Supersedes data of September 1994
File under Integrated Circuits, IC01
1998 Jan 06
1 page  
Philips Semiconductors
Noise shaping filter DAC
PINNING
SYMBOL PIN
DESCRIPTION
VDDA
VSSA
TEST1
1 analog supply voltage (+5 V)
2 analog ground
3 test input 1; pin should be connected
to ground
BCK
4 bit clock input
WS 5 word select input
DATA
6 data input
CLKS1
7 clock and format selection 1 input
CLKS2
8 clock and format selection 2 input
VSSD
VDDD
TEST2
9 digital ground
10 digital supply voltage (+5 V)
11 test input 2; pin should be connected
to ground
SYSCLK 12 system clock input 256fs or 384fs
APP3
13 application mode 3 input
APPL
14 application mode selection input
APP2
15 application mode 2 input
APP1
16 application mode 1 input
APP0
17 application mode 0 input
VOL
FILTCL
18 left channel output
19 capacitor for left channel 1st order
filter function; should be connected
between pins 19 and 18
FILTCR
20 capacitor for right channel 1st order
filter function; should be connected
between pins 20 and 21
VOR
Vref
VSSO
VDDO
21 right channel output
22 internal reference voltage for output
channels; 0.5VDDO (typ.)
23 operational amplifier ground
24 operational amplifier supply voltage
Product specification
TDA1306T
Fig.2 Pin configuration.
1998 Jan 06
5
5 Page 
Philips Semiconductors
Noise shaping filter DAC
Product specification
TDA1306T
There are two recommended application situations within
the microcontroller mode:
• The customer wants to use the microcontroller interface
without the volume setting facility. In this event the
operation is as follows:
– Mute ON; by sending the MUSB command
– Mute OFF; by sending the FS command
– Attenuation ON; by sending the ATSB command
– Attenuation OFF; by sending the FS command.
It is possible to switch from ‘Attenuation ON’ to ‘Mute
ON’ but not vice-versa.
• Incorporating the volume control feature operates as
follows:
– Mute ON; by sending the MUSB command the
microcontroller has to store the previous volume
setting
– Mute OFF; by sending succeeding INCR commands
until the previous volume is reached
– Attenuation ON; by sending succeeding DECR
commands until a relative downstep of −12 dB is
reached.
The microcontroller has to store the previous volume
– Attenuation OFF; by sending the succeeding INCR
commands until the previous volume is reached
– Volume UP; by sending succeeding INCR
commands
– Volume DOWN; by sending succeeding DECR
commands.
Double-speed mode
The double-speed mode is controlled by the DSMB bit at
register D6 (microcontroller application mode) or by
activating the APP1 pin (pseudo-static application mode).
When the control bit is active LOW the device operates in
the double-speed mode.
Oversampling filter and noise shaper
The digital filter is a four times oversampling filter.
It consists of two sections which each increase the sample
rate by 2. The noise-shaper operates on 4fs and reduces
the in-band noise density.
DAC and operational amplifiers
In this noise shaping filter DAC a special data code and
bidirectional current sources are used in order to achieve
true low-noise performance. The special data code
guarantees that only small values of current flow to the
output during small signal passages while larger positive
or negative values are generated using the bidirectional
current sources. The noise shaping filter-DAC uses the
continuous calibration conversion technique.
The operational amplifiers and the internal conversion
resistors RCONV1 and RCONV2 convert the DAC current to
an output voltage available at VOL and VOR. Connecting an
external capacitor between FILTCL and VOL, FILTCR and
VOR respectively provides the required 1st-order post
filtering.
De-emphasis
A digital de-emphasis is implemented in the TDA1306T.
By selecting the DEEM bit at register D4 (microcontroller
application mode) or activating the APP3 pin
(pseudo-static application mode), de-emphasis can be
applied by means of an IIR filter. De-emphasis is
synchronized to prevent operation in the middle of a word.
1998 Jan 06
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet TDA1306T.PDF ] | |
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