PSB21373HV1.1XT Infineon Technologies, PSB21373HV1.1XT Datasheet - Page 105

• Manufacturer Part Number: PSB21373HV1.1XT
• Manufacturer: Infineon Technologies

Specifications of PSB21373HV1.1XT

• Lead Free Status / RoHS Status: Compliant

PSB 21373
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
Analog Front End (AFE) Description
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 ear piece 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 56 shows the block diagram of the Analog Front End:
.
DREF
Figure 56
Block Diagram of AFE
Two differential inputs (MIP1/MIN1 and MIP2/MIN2) and one single-ended input (AXI)
can be connected to the amplifier AMI via an analog input multiplexer (ATCR.AIMX). The
programmable amplifier AMI (ATCR.MIC) provides a coarse gain adjustment range from
Data Sheet
105
2002-05-13