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參數資料
| 型號： | LUCL9313GP-DT |
| 英文描述： | Line Interface and Line Access Circuit Full-Feature SLIC and Ringing for TR-57 Applications |
| 中文描述： | 線路接口和線路接入電路全功能SLIC和敲響訓練班- 57應用 |
| 文件頁數： | 33/40頁 |
| 文件大小： | 746K |
| 代理商： | LUCL9313GP-DT |
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Data Sheet
September 2001
Full-Feature SLIC and Ringing Relay for TR-57 Applications
L9313 Line Interface and Line Access Circuit
Agere Systems Inc.
33
ac Applications
(continued)
Codec Types
(continued)
First-Generation Codecs
These perform the basic filtering, A/D (transmit), D/A
(receive), and
μ
-law/A-law companding. They all have
an op amp in front of the A/D converter for transmit
gain setting and hybrid balance (cancellation at the
summing node). Depending on the type, some have
differential analog input stages, differential analog
output stages, +5 V only or
±
5 V operation, and
μ
-law/A-law selectability. These are available in single
and quad designs. This type of codec requires continu-
ous time analog filtering via external resistor/capacitor
networks to set the ac design parameters. An example
of this type of codec is the Agere T7504 quad 5 V only
codec.
This type of codec tends to be the most economical in
terms of piece part price, but tends to require more
external components than a third-generation codec.
Further, ac parameters are fixed by the external R/C
network so software control of ac parameters is diffi-
cult.
Third-Generation Codecs
This class of devices includes all ac parameters set
digitally under microprocessor control. Depending on
the device, it may or may not have data control latches.
Additional functionality sometimes offered includes
tone plant generation and reception, PPM generation,
test algorithms, and echo cancellation. Again, this type
of codec may be +5 V only or
±
5 V operation, single
quad or 16-channel, and
μ
-law/A-law or 16-bit linear
coding selectable. Examples of this type of codec are
the Agere T8536/7 (5 V only, quad, standard features),
T8533/4 (5 V only, quad with echo cancellation), and
the T8531/36 (5 V only 16-channel with self-test).
ac Interface Network
The ac interface network between the L9313 and the
codec will vary depending on the codec selected. With
a first-generation codec, the interface between the
L9313 and codec actually sets the ac parameters. With
a third-generation codec, all ac parameters are set dig-
itally, internal to the codec; thus, the interface between
the L9313 and this type of codec is designed to avoid
overload at the codec input in the transmit direction,
and to optimize signal to noise ratio (S/N) in the receive
direction.
Because the design requirements are very different
with a first- or third-generation codec, the L9313 is
offered with two different receive gains. Each receive
gain was chosen to optimize, in terms of external com-
ponents required, the ac interface between the L9313
and codec.
With a first-generation codec, the termination imped-
ance is set by providing gain shaping through a feed-
back network from the SLIC VITR output to the SLIC
RCVN/RCVP inputs. The L9313 provides a transcon-
ductance from T/R to VITR in the transmit direction and
a single ended to differential gain in the receive direc-
tion, from either RCVN or RCVP to T/R. Assuming a
short from VITR to RCVN or RCVP, the maximum
impedance that is seen looking into the SLIC is the
product of the SLIC transconductance times the SLIC
receive gain, plus the protection resistors. The various
specified termination impedance can range over the
voiceband as low as 300
up to over 1000
. Thus, if
the SLIC gains are too low, it will be impossible to syn-
thesize the higher termination impedances. Further, the
termination that is achieved will be far less than what is
calculated by assuming a short for SLIC output to SLIC
input. In the receive direction, in order to control echo,
the gain is typically a loss, which requires a loss net-
work at the SLIC RCVN/RCVP inputs, which will
reduce the amount of gain that is available for termina-
tion impedance. For this reason, a high-gain SLIC is
required with a first-generation codec.
The ac interface network between the L9313 and the
codec will vary depending on the codec selected. With
a first-generation codec, the interface between the
L9313 and codec actually sets the ac parameters. With
a third-generation codec, all ac parameters are set dig-
itally, internal to the codec; thus, the interface between
the L9313 and this type of codec is designed to avoid
overload at the codec input in the transmit direction,
and to optimize signal to noise ratio (S/N) in the receive
direction.
Because the design requirements are very different
with a first- or third-generation codec, the L9313 is
offered with two different receive gains. Each receive
gain was chosen to optimize, in terms of external com-
ponents required, the ac interface between the L9313
and codec.
With a first-generation codec, the termination imped-
ance is set by providing gain shaping through a feed-
back network from the SLIC VITR output to the SLIC
RCVN/RCVP inputs. The L9313 provides a transcon-
ductance from T/R to VITR in the transmit direction and
a single ended to differential gain in the receive direc-
tion. From either RCVN or RCVP to T/R. Assuming a
short from VITR to RCVN or RCVP, the maximum
impedance that is seen looking into the SLIC is the
product of the SLIC transconductance times the SLIC
receive gain, plus the protection resistors. The various
specified termination impedance can range over the
voiceband as low as 300
up to over 1000
.
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