PSB 21373 H V1.1 Infineon Technologies, PSB 21373 H V1.1 Datasheet - Page 122
![no-image](/images/manufacturer_photos/0/3/327/infineon_technologies_sml.jpg)
PSB 21373 H V1.1
Manufacturer Part Number
PSB 21373 H V1.1
Description
IC SPEECH AND VOICE MQFP-44
Manufacturer
Infineon Technologies
Series
SCOUT™r
Datasheet
1.PSB_21373_H_V1.1.pdf
(242 pages)
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
PSB21373HV11XT
SP000007602
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Figure 63
Speakerphone Signal Flow Graph of the SCOUT-DX
4.4.1
The Attenuation Control unit controls the attenuation stages GHX of the transmit and
GHR of the receive directions respectively. The programmable loss is switched either
completely to a single path or, in the “IDLE” mode, is halved to each direction.
In addition, attenuation is also influenced by the Automatic Gain Control stages (AGCX
and AGCR). In order to keep the total loop gain always constant, the sweep range (of
ATT) is automatically enlarged with high-gain amplification of the AGCs while it will be
accordingly reduced with low-gain.
Changing from one speakerphone mode into another one depends on the
determinations of one comparator plus the corresponding speech detector. Hence
attenuation is influenced by the current and past speech activities. Also rate of change
varies: changing from “transmit mode” or “receive mode” to “idle mode” is programmable
by the rate factor DS. Direct changes from “transmit mode” to “receive mode” or vice-
versa and changes from “idle mode” to “transmit mode” or “receive mode” can be
programmed via the factor SW in a large range.
Data Sheet
Signal-Processing
Analog Front End
Signal-Processing
Analog Front End
&
&
Attenuation Control Unit
SX
SR
SCAE
SD
AGCX
Attenuation
GR
Control
122
GHX
GHR
SD
AGCR
SCLE
SR´
SX´
PSB 21373
COMP
EXP
2002-05-13
PCM
PCM
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