tda6811 Infineon Technologies Corporation, tda6811 Datasheet - Page 2

• Manufacturer Part Number: tda6811
• Description: Tv-stereo-surround Sound Interface
• Manufacturer: Infineon Technologies Corporation

Signal Circuit
The integrated circuit contains the components required for extending a conventional stereo sound
system from a two-channel arrangement to a three-channel Dolby surround system with Dolby
decoder.
The first component is a fine-step two-channel AF-level controller. It is used for adjusting the Dolby
decoder. Its operating range is 3 dB with 0.2 dB steps. The left and right channels can be adjusted
separately.
The second component, a mono volume control with a maximum gain of 10 dB, is used for the rear
channel generated in the Dolby decoder. 56 steps of 1.25 dB each provide a control range of
68.75 dB.
A total of seven switch outputs are provided for controlling the Dolby decoder via the I
Control Circuit
An I
in a latch block.
The telegram structure is as follows:
Start condition – chip address – any number of data bytes – stop condition.
The following conditions apply to data bytes:
The actual data byte (containing the data information) must always be preceded by a subaddress
byte.
Various subaddresses can be accessed within a message (ie. without new start condition).
Chip Address
Subaddress Bytes
Fine adjust, left
Fine adjust, right
Volume control
Switch outputs
Semiconductor Group
2
C Bus interface with listen/talk action controls all functions. The currently valid data are stored
MSB
MSB
X
X
X
X
1
X
X
X
X
0
.
.
2
X
X
X
X
0
.
.
X
X
X
X
1
.
.
0
0
0
0
0
.
.
0
0
0
0
0
.
.
1
0
0
1
1
.
.
TDA 6811
2
C Bus.
LSB
LSB
0
0
1
0
1