PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 375

• Manufacturer Part Number: PSB21473FV13XT
• Manufacturer: Infineon Technologies

Specifications of PSB21473FV13XT

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 144
• Lead Free Status / RoHS Status: Compliant

Figure 20-3 Speakerphone - Signal Connections
Internally, this unit can be divided into an echo cancellation unit and an echo suppression
unit (figure 20-4). The echo cancellation unit provides the attenuation G
suppression unit provides the attenuation G
speakerphone is therefore ATT=G
Figure 20-4 Speakerphone - Block Diagram
The echo cancellation unit estimates that part of the signal at the microphone that
originates from the loudspeaker. This part is then subtracted from the signal at the
microphone. This technique allows a full-duplex speakerphone. Furthermore, the echo
cancellation unit has a built-in noise reduction unit for better sound quality at the line side.
The echo suppression unit attenuates the receive or transmit path dependent on what
path is active. Without the echo cancellation unit and by using a high attenuation of the
echo suppression unit, the echo suppression unit provides a half-duplex speakerphone.
If the echo cancellation unit is active but cannot provide all of the required attenuation
itself, the echo suppression unit can be used to provide additional attenuation.Then, the
echo cancellation unit reports its current attenuation G
that the echo suppression unit can adapt its attenuation G
Data Sheet
loudspeaker
microphone
S
11
I
I
1
2
loudspeaker
microphone
Cancellation
o
u
d
a
c
s
c
s
e
Echo
t
i
i
G
c
Speakerphone
C
+G
s
.
375
s
. The total attenuation ATT of the
n
e
s
d
e
l
i
i
Suppression
c
Echo
to the echo suppression unit so
G
line out
line in
S
s
accordingly.
Digital Signal Processor
c
while the echo
PSB 21473
S
I
I
line out
line in
3
4
2003-03-31
12
INCA-D