psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 116

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

Data Sheet
The controlling and programming of the various operation modes, configurations and
coefficients can be done via the microcontroller interface or the IOM-2 monitor channel
and is described in the corresponding interface section. An overview on these
programmable parameters can be found in chapter 4.8.
4.1
The Analog Front End section of the codec is the interface between the analog
transducers and the digital signal processor. In the transmit direction the AFE function is
to amplify the transducer input signals (microphones) and to convert them into digital
signals. In the AFE receive section the incoming digital signal is converted to an analog
signal which is output to an earpiece and/or a loudspeaker.
The three AFE configuration registers (ACR, ATCR, ARCR) provide a high flexibility to
accommodate an extensive set of user procedures and terminal attributes.
Figure 60 shows the block diagram of the Analog Front End:
.
Figure 60
Block Diagram of AFE
Analog Front End (AFE) Description
DREF
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PSB 21391
PSB 21393
2001-03-07
Codec