PSB 2134 H V2.2 Infineon Technologies, PSB 2134 H V2.2 Datasheet - Page 74

• Manufacturer Part Number: PSB 2134 H V2.2
• Description: IC CODEC FILTER 4CHAN MQFP-64
• Manufacturer: Infineon Technologies
• Series: SICOFI®r

Specifications of PSB 2134 H V2.2

• Function: CODEC Filter
• Interface: IOM-2 PCM, SPI
• Number Of Circuits: 4
• Voltage - Supply: 5V
• Current - Supply: 26mA
• Power (watts): 130mW
• Mounting Type: Surface Mount
• Package / Case: 64-QFP
• Includes: Level Metering Function, Tone Generation
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Other names: PSB2134HV2.2X; SP000007389; SP000007390

Semiconductor Group
8
8.1
The purpose of this application note is to describe the handling of the Level Metering
Function and the facts that should be taken into account when using it.
The Level Metering Function is a feature which allows a self test of the chip and also a
test of the connected circuitry i.e. SLIC, subscriber line and analog telephone. No
external components are needed for this function.
8.2
Figure 33 shows the location of the Level Metering Function in the signal flow graph of
one channel.
Figure 30
Block diagram of one SICOFI2/4-TE channel
The level metering function is always used together with a bandpass filter. The
programming of this bandpass filter has to be done by programming the tone generator
coefficients of the tone generator TG2. Due to of the bandpass filter only the power of a
certain test signal is measured and disturbences originated from other signals are
avoided.
After passing the bandpass filter of the Level Metering Function the test signal in the
transmit path is rectified and the power of this signal is compared to the programmable
offset value of the Level Metering Function. The reading of the CR2-bit LMR shows if the
measured level of the test signal was higher or lower than the programmed offset value.
Application Note: Level Metering
Introduction
Level Metering Block
Transmit Path
Receive Path
74
Extended Register 7
Application Note: Level Metering
PSB 2132
PSB 2134
09.97