MT9123 Ver la hoja de datos (PDF) - Mitel Networks
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MT9123 Datasheet PDF : 32 Pages
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MT9123
Preliminary Information
Function
Controllerless
selected when pins CONFIG1 & 2 ≠ 00
Controller
selected when pins CONFIG1 & 2 = 00
Normal Configuration Set pins CONFIG1 to 1 and CONFIG2 1 to select this Set bits Extended-Delay to 0 and BBM to 0 in Control Reg-
configuration.
ister 1 to select.
Back-to-Back
Configuration
Set pins CONFIG1 to 1 and CONFIG2 to 0 to select
this configuration.
Set bit BBM to 1 in Control Register 1 to select.
Extended Delay
Configuration
Set pins CONFIG1 to 0 and CONFIG2 to 1 to select
this configuration.
Set bit Extended-Delay to 1 in Control Register 1 to select.
Mute
Set pins S2/S1 to 00 and S4/S3 to 00 to select for Echo Set bit MuteR to 1 or MuteS to 1 in Control Register 2 to
Canceller A and Echo Canceller B respectively.
select.
Bypass
Set pins S2/S1 to 01 and S4/S3 to 01 to select for Echo Set bit Bypass to 1 in Control Register 1 to select.
Canceller A and Echo Canceller B, respectively.
Disable Adaptation
Set pins S2/S1 to 10 and S4/S3 to 10 to select for Echo Set bit AdaptDis to 1 in Control Register 1 to select.
Canceller A and Echo Canceller B, respectively.
Enable Adaptation
Set pins S2/S1 to 11 and S4/S3 to 11 to select for Echo Set bits AdaptDis to 0 and Bypass to 0 in Control Register
Canceller A and Echo Canceller B, respectively.
1 to select.
SSI
Tie pin F0i to VSS to select.
Tie pin F0i to VSS to select.
ST-BUS
Apply a valid ST-BUS frame pulse to F0i pin to select. Apply a valid ST-BUS frame pulse to F0i pin to select.
12dB Attenuator
Always disabled.
Set bit PAD to 1 in Control Register 1 to enable.
Double-Talk
Detector
Continuously enabled which disables filter adaptation The detection threshold can be controlled via Double-Talk
when double-talk is detected.
Detection Threshold Register 1 and 2.
Non-Linear
Processor
Set pin NLP to 1 to enable.
Set bit NLPDis to 1 to disable.
PCM Law
Set pin LAW to 1 or 0 to select A-Law or µ-Law
respectively.
Set pin LAW to 1or 0 to select A-Law or µ-Law
respectively.
PCM Format
Set pin FORMAT to 0 or 1 to select Sign-Magnitude or Set pin FORMAT to 0 or 1 to select Sign-Magnitude or
ITU-T format respectively.
ITU-T format respectively.
Narrow-Band Signal Continuously enabled which disables the filter adapta- Set bit NBDis to 1 in Control Register 2 to disable.
Detector
tion when narrow band signal is detected.
Offset Null Filter
Continuously enabled which removes the DC compo- Set bit HPFDis to 1 in Control Register 2 to disable.
nent in the PCM input.
Table 7 - MT9123 Function Control Summary
8-56
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