參數(shù)資料
型號(hào)： MT9092
廠商： Mitel Networks Corporation
英文描述： ISO2-CMOS ST-BUS⑩ FAMILY Digital Telephone with HDLC (HPhone-II)
中文描述： ISO2 -意法半導(dǎo)體的CMOS總線⑩家庭數(shù)字與HDLC的電話（HPhone -Ⅱ）
文件頁(yè)數(shù)： 5/42頁(yè)
文件大?。?/td> 482K
代理商： MT9092
MT9092
7-7
voice side-tone path is also included to provide
proportional transmit speech feedback to the
handset receiver so that a dead sounding handset is
not encountered. Figure 3 depicts the nominal half-
channel and side-tone gains for the HPhone-
II
.
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
0.1μF capacitor must be connected from V
Bias
to
analog ground at all times. Likewise, although V
Ref
may only be used internally, a 0.1μF 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.
Figure 3 - Audio Gain Partitioning
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
μ
Law
Receive
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MT9094 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS ST-BUS⑩ FAMILY Digital Telephone (DPhone-II)
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