PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 391

• 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

Table 20-9
Parameter # of bytes Range
TW
ATT
DS
SW
Note: In addition, attenuation is also influenced by the Automatic Gain Control stages
Note: By programming parameter DS to 0xFF idle mode is disabled and the
20.1.3.4 Echo Suppression Status Output
The INCA-D can report the current state of the echo suppression unit to ease the
optimization of the parameter set of the echo suppression unit. The information is
available in register SPSCTL. The bits SPS0 and SPS1 are coded according to Table
20-10.
Table 20-10 SPS Encoding
20.1.3.5 Automatic Gain Control
The echo suppression unit has two identical automatic gain control units AGCX and
AGCR both referred to as AGC in this section.
Whether the automatic gain control AGC amplifies or attenuates depends on whether the
signal level is above or below the threshold level defined by parameter COM. The
threshold is relative to the maximum PCM-value and thus negative. The parameters
AG_GAIN and AG_ATT determine the amplification and attenuation, respectively. The
bold line in figure 20-16 gives an example for the steady-state output level of the AGC
as a function of the input level.
Data Sheet
SPS
0
0
1
1
(AGCX, AGCR) in order to keep the total loop attenuation constant.
speakerphone will remain in the last state. This parameter must be changed
before enabling the speakerphone.
0
1
1
1
1
SPS
Attenuation Control Parameters
0
1
0
1
1
Echo Suppression Unit State
no echo suppression operation
receive
transmit
idle
16 ms to 4 s
0 to 95 dB
0.6 to 680 ms/dB
0.0052 to 10 ms/dB Decay Rate (used for T
391
Comment
T
Attenuation for GHX and GHR
Decay Speed (to idle state)
TW
to return to idle state
Digital Signal Processor
SW
)
PSB 21473
2003-03-31
INCA-D