PSB21373HV1.1XT Infineon Technologies, PSB21373HV1.1XT Datasheet - Page 106

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

Specifications of PSB21373HV1.1XT

• Lead Free Status / RoHS Status: Compliant

0...42 dB in 6 dB steps. The maximum value of the programmable gain adjustment of the
microphone amplifier with specified transmission characteristics is 36 dB for the
differential input. The maximum gain value with specified transmission characteristics of
the single ended input AXI is 24 dB. Fine gain adjustment is performed in the digital
domain via the programmable gain adjustment stage GX (see signal processor section).
This allows a perfect level adaptation to various types of microphone transducers without
loss in the signal to noise performance.
The fully differential output HOP/HON connects the amplifier AHO to a handset
hairpiece. Differential output LSP/LSN is provided for use with a 50
programmable amplifiers AHO and ALS (ARCR.HOC, ARCR.LSC) provide a coarse
gain adjustment range from 11.5 dB...-21.5 dB (ALS) or 2.5 dB...-21.5 dB (AHO)
respectively. The step size is for both amplifiers 3dB. Fine gain adjustment is performed
in the digital domain via the programmable adjustment stage GR.
Each output of the differential amplifiers AHO and ALS can be powered down separately
(ACR.DHOP, DHON, DLSP, DLSN). By setting ACR.SEM, a powered down
loudspeaker output can be grounded internally for a single ended operation.
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 (TGSR.TRL) via a level shifter. The A/D and D/A converters can be powered
down by setting the ACR.ADC and ACR.DAC bits.
Note: The single-ended input (AXI) is internally connected to VREF. To avoid an
4.1.1
Figure 57 shows the attenuation plan of the AFE for the transmit and receive direction.
The levels are given for the digital reference level (0 dBm0) and the max. PCM level in
A-law coding (3.14 dBm0) for a supply voltage of 5 V.
The stated microphone amplifier gain (36 dB or 30 dB respectively) is the maximum gain
for guaranteed transmission characteristics.
In the receive path the stated loudspeaker or handset output amplification is the
maximum selectable gain at the maximum digital PCM level (3.14 dBm0) for guaranteed
transmission characteristics.
Data Sheet
unsymmetric input signal to the internal amplifer module, external resitors must
not be connected between AXI and GND or AXI and VREF.
AFE Attenuation Plan
106
loudspeaker. The
PSB 21373
2002-05-13