PSB 2134 H V2.2 Infineon Technologies, PSB 2134 H V2.2 Datasheet - Page 76

• 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
The procedure to find an unknown level is predesigned to be carried out by software.
The first valid LMR-bit is available 4 ms after enabling the level metering via setting bit
LM. Then the LMR-bit is updated every 4 ms corresponding to the topical test signal and
the stored offset byte. During the measurement time of 4ms the test signal has to be
stable. That means for the above mentioned procedure to find an unknown level:
1. After programming the offset register and enabling the Level Metering Function, the
software has to wait for at least 4 ms before accessing the first valid LMR-bit.
2. After programming the offset register again the software has to wait for at least 4 ms
before accessing bit LMR.
3 After a change of the test level the software has to wait for at least 8 ms before
accessing bit LMR.
8.4
The bytes for the offset register are assigned to voltage values with a distance of about
0,02 Vrms. Since a level is measured by determining the bytes below and above, the
distance between two consecutive bytes defines the relative measuring precision.
The maximum relative measuring error is about 0.02 Vrms.
The absolute measuring precision is depending on the gain tracking and described in the
SICOFI2/4-TE data sheet.
8.5
In order to perform a measurement, an appropriate test signal is necessary.
There are 3 different ways to create a test signal: built-in tone generators, test equipment
PCM4 by Wandel and Goltermann or an external analog test source.
8.6
Only tone generator 1 is available for level metering. By setting the LM bit in CR2 tone
generator 2 is automatically switched off. But it is necessary to program both bandpass
filters with the same coefficients because the coefficients of tone generator 2 determine
also the bandpass filter for the Level Metering Function. Only with identically adjusted
bandpass filters a precise level metering is possible.
A very simplified block diagram is shown in figure 35.
Figure 32
Test signal generated by tone generator 1
Analog
Telephone
Set
Relative Measuring Precision
Generating Tests Signals
Tone Generators
Z
T
Subscriber
Line
Z
L
.
76
SLIC
Z
SLIC
Application Note: Level Metering
C
C
Test Signal
Tone Generator 1
Level Metering
Function
SICOFI2/4-TE
PSB 2132
PSB 2134
09.97