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參數(shù)資料
| 型號： | MX826DW |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | AMPS/NAMPS SYSTEM AUDIO PROCESSOR |
| 中文描述： | 的AMPS / NAMPS系統(tǒng)的音頻處理器 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 328K |
| 代理商： | MX826DW |
AMPS/NAMPS System Audio Processor.
Description
The MX826 is a
μ
Processor controlled full-duplex
audio processor on a single-chip with separate TX and
RX paths to provide all the filter/gain/limiting functions
necessary to pre-process audio, wideband-data and SAT
cellular communications systems using the AMPS/NAMPS
or TACS/ETACS/JTACS specifications.
Selectable inputs available to the transmit path are: a
choice of two microphones and DTMF/signaling, with
access, in this path, to external compression circuitry.
Operationally the TX path provides input gain/filtering, a
deviation limiter and TX Modulation Drive controls.
In the RX path the SAT signal is separated from the
incoming audio via a filter block and made available at a
separate pin for mixing externally with the TX Modulation
Drive.
The RX path consists of an input gain/filter block for
MX826 Preliminary Information
1997 MX
COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480070.004
All trademarks and service marks are held by their respective companies.
voice, inputs from an external audio expansion system
and an output gain control driving either a loudspeaker
system or earpiece.
Unique to the MX816/826/836 cellular audio
processors is the ability to route audio (TX or RX) to an
external Voice Store and Retrieve (VSR) device such as
the MX802 or MX812 thus providing the radio system with
a voice answering and announcement facility using
external DRAM.
As a member of the DBS800 family, the MX826
follows C-BUS protocol. (C-BUS is the serial interface
used by all DBS800 integrated circuits.)
The MX826, a low-power CMOS device which reduces
the amount of microcircuits and components required in
a cellular audio system by providing more functions on a
single chip, is available in 28-pin SOIC and CDIP packages.
1
Xtal:
The output of the on-chip clock oscillator.
2
Xtal/Clock:
The input to the on-chip clock oscillator. A Xtal or externally derived clock (f
) should be
connected here. Note that operation of the MX826 without a suitable Xtal or clock input may cause device
damage. See Figure 2 (notes).
3
Serial Clock:
The “C-BUS” serial data clock input. This clock, produced by the
μ
Controller, is used for
transfer timing of commands and data to the MX826. See Timing Diagrams.
4
Command Data:
The “C-BUS” serial data input from the μController. Data is loaded to the MX826 in 8-
bit bytes, MSB (B7) first, and LSB (B0) last, synchronized to the Serial Clock. See Timing Diagrams.
5
Chip Select (CS):
The “C-BUS” data loading control function. This input is provided by the
μ
Controller.
Data transfer sequences are initiated, completed or aborted by this signal. See Timing Diagrams.
6
V
BIAS
:
The internal circuitry bias line, held at V
DD
/2 this pin must be decoupled to V
SS
. See Figure 2.
Rx Audio In:
Normally taken from the radio's discriminator output, this input has a 1M
internal resistor
to V
BIAS
and requires to be connected via a capacitor.
7
8
Expand/Store:
A common output that can be used as either an input to an external audio expander or
the input to a voice storage medium such as the MX812. Components relevant to the external device
requirements should be used at this output. See Figures 2 and 3.
9
(Expanded) Audio In:
The audio input, via SW5, from an external expander or audio mixing function. This
input has a 1M
internal resistor to V
BIAS
and requires to be connected via a capacitor. See Figures 2 and
3.
10
TX Mod Out:
The composite TX audio output to the transmitter modulator from a variable attenuation
stage (11
H
). This output is set to V
BIAS
via an internal 1M
resistor when set to Powersave or OFF.
11
LS Audio Out:
An audio output of the Rx path (or selected audios, see Figure 3) for a loudspeaker system.
This is available for handsfree operation. This output can be connected to V
BIAS
when not required, by SW6
(Configuration Command (10
H
)). A driver amplifier may be required.
Notes on nputs:
To minimize aliasing effects, owpass iltering may be required at he nputs o his device
(especially those supplied from switched-capacitor-type devices) to ensure the input spectrum is kept
below 63kHz.
Pin
Function
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| MX826 | AMPS/NAMPS SYSTEM AUDIO PROCESSOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MX826J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AMPS/NAMPS SYSTEM AUDIO PROCESSOR |
| MX-826MC | 制造商:Murata Power Solutions 功能描述:ANLG MUX SGL 8:1 15.5V/5.25V 24PIN DDIP - Bulk 制造商:Murata Power Solutions 功能描述:Analog Multiplexer Single 8:1 24-Pin CDDIP |
| MX-826MM | 制造商:Murata Power Solutions 功能描述:ANLG MUX SGL 8:1 15.5V/5.25V 24PIN DDIP - Bulk 制造商:Murata Power Solutions 功能描述:Analog Multiplexer Single 8:1 24-Pin CDDIP |
| MX828 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:CTCSS/DCS/SelCall Processor |
| MX829 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:Baseband Signal Processor |
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