Features: · Low power dissipation
· Digital volume control
· Soft mute
· Digital tone control (Bass Boost and Treble)
· Digital de-emphasis
· Analog control of digital sound control functions.Pinout
SpecificationsIn accordance with the Absolute Maximum Rating System (IEC 134).
| SYMBOL |
PARAMETER |
CONDITIONS |
MIN. |
MAX. |
UNIT |
| VDD |
supply voltage |
note 1 |
- |
4.5 |
V |
| Txtal(max) |
maximum crystal temperature |
|
- |
+150 |
|
| Tstg |
storage temperature |
|
-65 |
+125 |
|
| Tamb |
operating ambient temperature |
|
-20 |
+70 |
|
| Ves |
electrostatic handling |
note 2 |
-3000 |
+3000 |
V |
| note 3 |
-300 |
+300 |
V |
Notes
1. All VDD and VSS connections must be made to the same power supply.
2. Equivalent to discharging a 100 pF capacitor via a 1.5 k series resistor. Pin 18 = -1500 V (min) and +1500 V(max).
3. Equivalent to discharging a 200 pF capacitor via a 2.5 H series inductor.DescriptionThe TDA1548T is a dual CMOS digital-to-analog converter (DAC) with up-sampling filter and noise shaper andintegrated headphone driver featuring unique signal processing functions. The digital processing features are of high sound processing quality due to the wide dynamic range of the bitstream conversion technique.
The TDA1548T supports the I2S-bus data input mode with word lengths of up to 20 bits and the LSB justified serial data input format with word lengths of 16, 18 or 20 bits. The clock system is selectable (64fs, 256fs or 384fs) by means of selection pins. Two cascaded half band filters, linear interpolator and a sample-and-hold function increase the oversampling rate from 1fs to 64fs. A second-order noise shaper converts this oversampled data into a bitstream for the 5-bit continuous calibration DACs.
On board amplifiers convert the output current to a voltage signal capable of driving a headphone or line output. The common operational amplifier application eliminates the need for capacitors.
The TDA1548T has some sound processing functions which are controllable by a potentiometer. These functions are volume, bass boost and treble. The flat/min/max switch can also be controlled by a potentiometer. The analog values are converted to a digital code, which is then further translated internally to a set of coefficients for either volume, bass boost or treble.
TDA1548T Data Sheet
