MH88614 Просмотр технического описания (PDF) - Mitel Networks
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MH88614 Datasheet PDF : 10 Pages
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MH88614
Advance Information
Pin Description
IC
IC
TIP
IC
RING
LOOP
BGND
WU
EGB
IC
VBAT
IC
PD
AGND
VDD
VEE
IC
VR
IC
VX
1
IC
21
2
LCA
22
3
IC
23
4
LA
24
5
IC
25
6
VRING
26
7
VMSE
27
8
RE
28
9
MSE
29
10
SHK
30
11
12
13
14
15
16
17
18
19
20
Figure 2 - Pin Connections
Pin # Name
Description
1
IC Internal Connection
2
IC Internal Connection
3
TIP Connects to the “Tip” lead of the telephone line.
4
IC Internal Connection
5
RING Connects to the “Ring” lead of the telephone line
6
LOOP Loop Length Indication. The output on this pin is proportional to the loop length /
resistance, and is valid for off hook conditions only.
7
BGND Battery Ground. This pin is the return pin for the battery feed to the line and also for the
message voltage supply and the Ring Voltage supply. This pin should normally be
connected to AGND.
8
WU Wake Up(Output). When in the power down mode this pin goes high to indicate the phone
has gone off hook. When this occurs the power down signal should be removed.
9
EGB Earth Ground Button Detection (Output) This output goes low when the ring lead or tip
lead is grounded.
10
IC Internal Connection
11
VBAT Battery Feed Supply. This pin is the supply for the line feed. (Typically -48V).
12
IC Internal Connection
13
PD Power Down (Input) Applying a logic 0 (Active low) will Power down the hybrid. This may
be used, but must be removed to allow a call to be made or to reduce power consumption.
14
AGND Analog Ground. This pin is the return pin for the positive and negative supplies and is
normally connected to BGND.
15
VDD Positive Supply. (Typically +5V).
16
VEE Negative Supply. (Typically -5V).
17
IC Internal Connection
18
VR Receive (Input). The audio input signal is applied to this pin from the programmable
CODEC. This signal is internally a.c. coupled
2-130
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