參數(shù)資料
型號(hào)： MT9196AE1
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Integrated Digital Phone Circuit (IDPC)
中文描述： SPECIALTY TELECOM CIRCUIT, PDIP28
封裝： 0.600 INCH, LEAD FREE, PLASTIC, MS-011AB, DIP-28
文件頁(yè)數(shù)： 9/46頁(yè)
文件大?。?/td> 631K
代理商： MT9196AE1
MT9196
Data Sheet
9
Zarlink Semiconductor Inc.
Since the received digital gain control is used to set the listening level of the received speech, for both handset
receiver and loudspeaker, it is necessary to provide additional gain in the loudspeaker path so that its receive level
can be controlled independently from the receiver output. The Gain0 to Gain3 control bits (address 0Bh) are used
to boost the loudspeaker output to a comfortable listening level for the third parties in group listening. Generally the
Gain3 bit should be set to logic 1 in this mode. This increases the gain programmed via the Gain0 - Gain2 bits by a
factor of 8 dB. In group listening a speaker gain setting of 4 to 16 dB will be required to set a comfortable group
listening level after the handset user has adjusted their listening level as required.
Since the anti-howling circuit has dynamic control over the transmit and receive gain control registers, it is
recommended that this function be turned off momentarily when DTMF tone generation is required. This will ensure
that the proper transmit levels are attained.
Transmit Noise Reduction (squelch)
The transmit signal may be muted to eliminate transmission of excessive background noise.
In this mode the signal level in the transmit path is compared with the high level threshold stored at address 1Dh.
When the transmit signal level exceeds this threshold no loss is inserted into the transmit path. After exceeding the
high level threshold the transmit signal level is then compared to a low level threshold stored at address 1Eh. When
the transmit signal level falls below this threshold the transmit digital gain is reduced by the programmed amount
(Pad0-2) and comparison reverts back to the high threshold level. The receive path gain is not altered by transmit
noise reduction.
Receive Noise Reduction (squelch)
The receive signal may be muted to eliminate background noise resulting from a poor trunk connection.
In this mode the signal level in the receive path is compared with the high level threshold stored at address 1Dh.
When the receive signal level exceeds this threshold no loss is inserted into the receive path. After exceeding the
high level threshold the receive signal level is then compared to a low level threshold stored at address 1Eh. When
the receive signal level falls below this threshold the receive digital gain is reduced by the programmed amount
(Pad2-0) and comparison reverts back to the high threshold level. The transmit path gain is not altered by receive
noise reduction.
Tx/Rx Switched Loss
In this mode the programmed switched loss is inserted into either the transmit or receive path dependent only upon
activity in the receive path. If receive path activity is above the programmed high level threshold then the switched
loss is inserted into the transmit path. If receive path activity is below the programmed low level threshold then the
switched loss is inserted into the receive path.
This mode can be used to implement a loudspeaking function where the receive audio is routed to the SPKR
±
pins
and transmit audio is sourced from the MIC+ pin. In this mode there is no algorithmic cancellation of echo so it is
recommended that this switched loss program be used only in 4-wire systems (i.e., digital set to digital set).
Transducer Interfaces
Four standard telephony transducer interfaces plus an auxiliary I/O are provided by the IDPC. These are:
The handset microphone inputs (transmitter), pins M+/M- and the answerback microphone input MIC+. The
nominal transmit path gain may be adjusted to either 6.0 dB or 15.3 dB. Control of this gain is provided by
the TxINC control bit (Control register 2, address 0Fh). This gain adjustment is in addition to the
programmable gain provided by the transmit filter and Digital Gain circuit.
The handset speaker outputs (receiver), pins HSPKR+/HSPKR-.Thisinternallycompensated, fully differential
output driver is capable of driving the load shown in Figure 4. The nominal handset receive path gain may be
adjusted to either -12.1 dB or -9.6 dB. Control of this gain is provided by the RxINC control bit (Control
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