參數(shù)資料
型號(hào)： MT92303
廠商： Mitel Networks Corporation
元件分類(lèi)： Codec
英文描述： 3.3V Quad Interface, Dual Codec(3.3V 四接口雙編解碼器（提供音頻到PCM的接口）)
中文描述： 3.3四種接口，雙編解碼器（3.3四接口雙編解碼器（提供音頻到的PCM的接口））
文件頁(yè)數(shù)： 5/34頁(yè)
文件大小： 166K
代理商： MT92303
Preliminary Information
MT92303
5
Voice Channel
Figure 4 shows the companding, filtering and gain
stages in a single voice channel as set up by the
Cross-Point. The RX channel (top) and TX channel
(bottom) both use a mixture of digital-DSP and
analog techniques. The DSP domain is towards the
left of the diagram and extends from the PCM
interface to the DAC and ADC blocks.
RX Channel
PCM data is taken in either linear or companded
form and is processed by the DSP circuitry. This
provides a digital volume control, an access point for
sidetone, and the multi-order low-pass filtering
required to remove the sampling aliases in the
digitised data. The 6
th
order low-pass filter response
is shown in Figure 5. An optional 1
st
order high-pass
filter is also provided. In addition to the gain
adjustment, the RX DSP channel may also be
turned-off (‘muted’). The filtered version of the data
is converted to an analog signal by the DAC and
continuous-time low-pass filter before passing
through the Cross-Point circuitry to the variable-gain
output buffer. The buffer provides a differential output
signal which allows near rail-to-rail operation and
can deliver 66mW into a 32 Ohm load.
As shown in Figure 4, the RX gain may be adjusted
in two places. The ‘DSP’ provides adjustment from
-21dB to +0dB in 3dB steps, and the ‘a(chǎn)nalog’ from
-28dB to +2dB in 2dB steps.
Figure 5 - RX Low-Pass Filter Response
0dB
-3dB
-2dB
-1dB
1kHz
2kHz
3kHz
Figure 4 - Single Voice-Channel DSP and Analog Circuitry
ADC
DAC
-21dB to 0dB
in 3dB steps
Bypass
Control
8/16
u/A
Law
Smoothing
Filter
-28dB to +2dB
in 2dB steps
Rec
1.012Vrms
@ 0dBm0
Cross
Point
Bypass
Control
8/16
u/A
Law
G.712 Filtering
6
th
order low-pass @ 3.4kHz
4
th
order hi-pass @ 150Hz
Anti-Alias
Filter
0dB to 22.5dB
in 1.5dB steps
Mic
0.611Vrms
@ 0dBm0
24dB
Bypass
Control
Pre-Amp
Sidetone
-39dB to +6dB
in 3dB steps
G.712 Filtering
6
th
order low-pass @ 3.4kHz
1
st
order hi-pass @ 0-400Hz
Cross
Point
‘DSP’
‘Analog’
RX
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