MX806ADW 데이터 시트보기 (PDF) - MX-COM Inc
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MX806ADW Datasheet PDF : 23 Pages
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Audio Processor
EXTERNAL INTEGRATION COMPONENTS
VOGAD
IN
R5
C8
MIC. OUT
- MIC. IN
+
TX
MIC. IN
VOGAD
(Voltage Controlled)
AMPLIFIER
TX INPUT PROCESS
To EXTERNAL AUDIO PROCESSES
8
MX806A
R6
V
DD
R12
VSS
HI - LO PEAK
DETECTOR
VOGAD
OUT
HI PEAK
DETECTOR
MAIN PROCESS
CAL
INPUT
TX
DRIVES
RX
DRIVE
PROCESSED AUDIO IN
Figure 3: VOGAD Sensors and Timing Components (from Figure 5)
VOGAD attack and decay times are set using the external components shown in Figure 2 and Figure 3. They
are calculated as described below.
4.2.1 VOGAD Components Calculations – Figure 2 and Figure 5
Provided R5 1.0k and R6 R12 R5
Then
Attack Time (TA ) R5 x C8
Decay
Time
(TD
)
R6
x
2
C8
4.3 Calibration Methods
To effectively null all internal IC tolerance, the following initial calibration routine is suggested.
4.3.1 TX Calibration: From Mic. In to Modulator Drives Out
Disable Peak Detectors (Mode Command)
Set Transmitter Drives to 0dB (Mod. Levels Set)
Pre-emphasis may be employed as required (Control Command)
Set Input Level Amp to 0dB Control Command)
1. Mic. In = 250mVRMS at 1kHz. Set Process Gain Amp for output of 1440mVP-P (100% deviation).
2. With Process Gain Amp set as 1 and with Mic. In = 25mVRMS at 1kHz, set the Input Level Amp for an
output level of 308mVRMS (60% deviation)
4.3.2 RX Calibration: From RX Audio In to Audio Out
Set Audio Output Drive In to Audio Out
Leave Process Gain Amp set as 1 (See Section 4.3.1)
3. With and RX Audio In level of between 154mVRMS and 308mVRMS (See Section 7) at 1kHz, set the Input
Level Amp for and output level of 308mVRMS.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480064.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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