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參數(shù)資料
| 型號： | MT9094 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Digital Telephone (DPhone-II)(數(shù)字電話) |
| 中文描述： | 數(shù)字電話（DPhone -Ⅱ）（數(shù)字電話） |
| 文件頁數(shù)： | 5/34頁 |
| 文件大小： | 234K |
| 代理商： | MT9094 |
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MT9094
7-49
On PWRST (pin 6) the Filter/CODEC defaults such
that the side-tone path, dial tone filter and 400Hz
transmit filter are off, all programmable gains are set
to 0dB and
μ
-Law companding is selected. Further,
the Filter/CODEC is powered down due to the PuFC
bit (Transducer Control Register, address 0Eh) being
reset. This bit must be set high to enable the Filter/
CODEC.
The internal architecture is fully differential to provide
the best possible noise rejection as well as to allow a
wide dynamic range from a single 5 volt supply
design.
This
fully
differential
continued into the Transducer Interface section to
provide full chip realization of these capabilites.
architecture
is
A reference voltage (V
Ref
), for the conversion
requirements of the CODER section, and a bias
voltage (V
Bias
), for biasing the internal analog
sections, are both generated on-chip. V
Bias
is also
brought to an external pin so that it may be used for
biasing any external gain plan setting amplifiers. A
0.1
μ
F capacitor must be connected from V
Bias
to
analog ground at all times. Likewise, although V
Ref
may only be used internally, a 0.1
μ
F capacitor from
the V
Ref
pin to ground is required at all times. It is
suggested that the analog ground reference point for
these two capacitors be physically the same point.
To facilitate this the V
Ref
and V
Bias
pins are situated
on adjacent pins.
The transmit filter is designed to meet CCITT G.714
specifications. The nominal gain for this filter path is
0dB (gain control = 0dB). An anti-aliasing filter is
SERIAL
PORT
DSP GAIN*
FILTER/CODEC
TRANSDUCER INTERFACE
PCM
PCM
–72 to
+22.5 dB
(1.5dB
steps)
DTMF,
Tone
Ringer &
Handsfree
–72 to
+22.5 dB
(1.5dB
steps)
Receive
Filter Gain
0 to –7 dB
(1 dB steps)
Side-tone
–9.96 to
+9.96dB
(3.32 dB steps)
Side-tone
Nominal
Gain
Transmit
Filter Gain
0 to +7dB
(1 dB steps)
μ
-Law –11 dB
Α
-Law –18.8 dB
-6 dB
Speaker Gain
0 to –24 dB
(8 dB steps)
Receiver
Driver
Speaker
Phone
Driver
0.2dB*
Tone
Ringer
(input
from DSP)
Transmit
Gain
M
U
X
μ
-Law –6.3 dB
Α
-Law –3.7 dB
μ
-Law 6.1dB
Α
-Law 15.4dB
MIC+
MIC–
M+
M–
-6 dB
HSPKR+
HSPKR–
SPKR+
SPKR–
Speakerphone
Speaker
(40
nominal)
(32
min)
Handsfree
mic
Transmitter
microphone
Handset
Receiver
(150
)
Transmit
Internal to Device
External to Device
DIGITAL DOMAIN
ANALOG DOMAIN
75
75
Note: *gain the same for A-Law and m
Law
Receive
Figure 3 - Audio Gain Partitioning
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