PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 367

• 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

INCA-D
PSB 21473
Analog Front End
Three differential inputs (MIP1/MIN1, MIP2/MIN2 and MIP3/MIN3) 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 0...42dB in
6dB steps.
The maximum value of the programmable gain adjustment of the microphone amplifier
with specified transmission characteristics (see Electrical Characteristics) is 36 dB for
the differential input. Fine gain adjustment is performed in the digital domain via the
programmable gain adjustment stage IG1 (see DSP section).
The fully differential outputs HOP1/HON1 or HOP2/HON2 respectively, connect the
amplifier AHO1 or AHO2 to a handset or headset earpiece. The outputs support loads
of 200
Differential output LSP/LSN is provided for use with a 20 or 25
loudspeaker. The driver
capability for the loudspeaker is 100 or 80mW respectively (sine wave).
The programmable amplifiers AHO1, AHO2 and ALS (ARCR.HOC, ARCR.LSC) provide
a coarse gain adjustment range from 11.5dB...-21.5dB (ALS) or 2.5dB...-21.5dB (AHO1,
AHO2) respectively. The step size is for all three amplifiers 3dB. Fine gain adjustment is
performed in the digital domain via the programmable adjustment stage IG2.
Each output of the differential amplifiers AHO1, AHO2 and ALS can be enabled
separately (ACR.EHOP, EHON, ELSP, ELSN). The "loudhearing" mode is active when
the conversation happens via the handset (with HOP1/HON1 and MIP1/MIN1 being
active for example) and when additionally the loudspeaker is used with LSP/LSN being
active. If loudhearing is active, the override-enable bit OVRE should be set. While the
loudspeaker amplifier ALS amplifies with LSC normally, the ALS amplifies with OVLS if
the speech detector SDR of the echo suppression unit detects speech on the line side.
This technique allows to use a lower amplification of the ALS when speech is received
in order to prevent acoustic echos.
The bandgap reference voltage is low-pass filtered via a capacity connected to pin
BGREF.
The internal and external reference voltages are derived from this filtered bandgap
reference voltage providing a good noise performance.
A square wave signal from the tone generator can be output directly to the loudspeaker
amplifier. To output this signal to the loudspeaker, TRL must be set.
If the DSP does not have enough computational power left to provide the analog frontend
with the appropriate data, the bit COV in the STATUS register is set (see Chapter 20.3
for details on the computational costs). The bit COV will be cleared by a write access to
register AFECTL.
The registers for programming the analog frontend are shown in table 19-1.
Data Sheet
367
2003-03-31