PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 401

• 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

Furthermore the AGC contains a comparator that starts and stops the gain regulation.
The signal after the summation point (S17) is filtered by a peak detector with time
constant DEC for decay. Then the signal is compared to a programmable limit LIM.
Regulation takes only place when the filtered signal exceeds the limit.
Table 20-21 shows the associated registers.
Table 20-21 Automatic Gain Control Registers
Register # of Bits
AGCCTL 1
AGCCTL 5
AGCCTL 5
AGCATT 15
AGC1
AGC1
AGC2
AGC2
AGC3
AGC3
AGC4
AGC4
AGC5
20.1.10
Additionally to the noise reduction (NR) unit built in the speakerphone, another noise
reduction unit is available. It can be useful for reducing the noise coming in the receive
path if uncomfortable noise comes from the line side.
Figure 20-24 Noise Reduction - Block Diagram
Data Sheet
8
8
8
8
7
8
7
8
7
Noise Reduction Unit
I
1
Name
EN
I1
I2
ATT
AG_INIT
COM
SPEEDL
SPEEDH
AG_ATT
AG_GAIN
DEC
LIM
LP
Comment
Enable
Input signal 1 for AGC
Input signal 2 for AGC
Attenuation for I
Initial AGC gain/attenuation
Compare level relative to max. PCM-value
Change rate for lower levels
Change rate for higher level
Attenuation range
Gain range
Peak detector time constant
Comparator minimal signal level
AGC low pass time constant
Reduction
Noise
401
2
Digital Signal Processor
S
25
PSB 21473
2003-03-31
INCA-D