TDA7501TR STMICROELECTRONICS [STMicroelectronics], TDA7501TR Datasheet - Page 14

• Manufacturer Part Number: TDA7501TR
• Description: Line driver for digital car radio Signal processor (DSPLD)
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Description of the output part
4.2
14/29
Figure 11. Level diagram.
Speaker (linedriver) outputs
The Speaker outputs can be configured in three different operating modes:
1.
2.
3.
Basically, in the internalreference mode the linedriver amplifier acts as a buffer with 0dB gain
regardless of the output gain programmed by bit D0. Since the buffer tracks the internal
generated reference, the OUTPUTREF pin may be left floating.
In the external reference mode the linedriver amplifiers reference tracks the voltage present
at the OUTPUTREF pin. This reference does not necessary have to be external to the
device, it can also be generated by invoking the VCC/2 divider inside the TDA7501 (bit
D1/6). In practice, the term external reference implied that the OUTPUTREF pin at least has
to connect to an external capacitor. In the external reference mode, an additional gain of
6dB can be added by assessing bit D0. This provides a nominal 4V
the TDA7501 is powered from a dual supply (V
only 2.8V
For the programming of output gain and reference selection see the programming section.
Figure 12. Speaker (Linedriver) outputs simplified
- Internal reference mode with 0dB output gain,
- External reference mode with 0dB output gain
- External reference mode with 6dB output gain
4.15Vdc
2Vrms
IN
RMS
output level can be acheived.
INPUT GAIN
1dB STEP
0..15dB
from VOLUME-STAGE
INPUT PART
4.15Vdc
4.15Vdc
2Vrms
2Vrms
V
REF
INTERFACE
CODEC
0.8Vrms
1.65Vdc
buffer
0dB
D1/6
TDA7500
TDA7501
2R
2R
6dB
6dB
D00AU1205
R
R
0.9Vrms
1.65Vdc
DD
6dB
6dB
= 8.3V). When fed from a single supply,
3R
3R
D0/6
D0/6
SELECT
LEVEL
GAIN
+6dB or
+12dB
+
-
D1/6
4.15Vdc
2Vrms
VOLUME
-79dB
+15
..
OUTPUT PART
D00AU1207
V
OUTPUTREF
SPKROUT
REF
2Vrms (typ)
4.15Vdc
RMS
LINEDRIVERS
0/+6dB STEP
OUTPUT
output level in case
4.15Vdc
2Vrms
4Vrms
OUT
6Vdc
or
TDA7501