PSB 21373 H V1.1 Infineon Technologies, PSB 21373 H V1.1 Datasheet - Page 84

• Manufacturer Part Number: PSB 21373 H V1.1
• Description: IC SPEECH AND VOICE MQFP-44
• Manufacturer: Infineon Technologies
• Series: SCOUT™r

Specifications of PSB 21373 H V1.1

• Function: CODEC
• Interface: IOM-2, SCI
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 97.5mA
• Mounting Type: Surface Mount
• Package / Case: 44-BQFP
• Includes: Activation and Deactivation, Channel Handler, DTMF / Tone / Ringing Generator, HDLC Controller, Speakerphone, Voice Monitoring
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Operating Temperature: -
• Other names: PSB21373HV1.1XT; PSB21373HV11XT; SP000007602

2.3.9
The SCOUT-DX covers the electrical requirements of the line interface for loop lengths
of up to 1.8 km (6 kft) on AWG 24 cable.
In order to additionally reduce the bit error rate in severe conditions, the SCOUT-DX
performs oversampling of the received signal and uses majority decision logic. The
receive signal is sampled at 15.36 MHz clock intervals (XTAL).
2.3.10
The connection of the line transformer is shown in figure 45. External to the line interface
pins Lla and Llb a transformer and external resistors are connected as shown. Note that
the internal resistors of the transformer are calculated as zero. The actual values of the
external resistors must take into account the real resistor of the chosen transformer.
Figure 45
Connection of the Line Transformers to the SCOUT-DX
Because the SCOUT-DX will generate a voltage swing of about 1.4 Vpk at LIa/Llb (figure
44), a 2:1 transformer is needed to achieve the required 0.65 Vpk on the line interface.
E.g. the use of a VAC 3-M5032-X013 transformer is recommended.
Data Sheet
Receiver Characteristics
Line Interface Circuitry
SCOUT-DX
LIa
LIb
84
100 nF
2 : 1
ext_line_circui
330 nF
t d vsd
Line Interface
PSB 21373
2002-05-13