參數(shù)資料
型號(hào)： TDA1306T-T
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： DAC
英文描述： DUAL, SERIAL INPUT LOADING, 20-BIT DAC, PDSO24
文件頁(yè)數(shù)： 3/24頁(yè)
文件大?。?/td> 166K
代理商： TDA1306T-T
1998 Jan 06
11
Philips Semiconductors
Product specication
Noise shaping lter DAC
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.
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.
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 lter 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 ampliers
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.
相關(guān)PDF資料
PDF描述
TDA1306TD SERIAL INPUT LOADING, 20-BIT DAC, PDSO24
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