MH88422 データシートの表示（PDF） - Mitel Networks
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MH88422 Datasheet PDF : 14 Pages
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MH88422
Preliminary Information
VDD 1
IC 2
AGND 3
IC 4
LC 5
IC 6
RVLC 7
IC 8
IC 9
IC/NP 10
VX 11
IC/NP 12
VR 13
26 TIP
25
IC
24
RLS
23
IC/NP
22
IC
21
IC/NP
20
TF
19
NP
18
TXIN
17
IC
16
RING
15
NP
14
IC
Figure 2 - Pin Connections
Pin Description
Pin #
Name
Description
1
VDD Positive Supply Voltage. +5V.
2, 4, 6,
8, 9
IC
Internal Connection. This pin is cropped short.
3
AGND Analog Ground. 4-Wire Ground. Normally connected to System Ground.
5
LC
Loop Control (Input). A logic 0 activates internal circuitry which provides a line
termination across Tip and Ring. Used for seizing the line and dial pulsing.
7
RVLC Ringing Voltage and Current Detect (Output). Indicates the status of loop current
and ringing voltage.
10, 12
IC/NP
Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted,
depending on the variant. See Note 1
11
VX
Transmit (Output). Analog output to modem/fax chip set.
13
VR
Receive (Input). Analog input to modem/fax chip set.
14, 17
IC
Internal Connection. This pin is cropped short.
15, 19
NP
No Pin Fitted.
16
RING Ring Lead. Connects to the "Ring" lead of a telephone line.
18
TXIN Dummy Ringer Connection. Connects to the "Ring" lead of a telephone line through a
dummy ringer capacitor.
20
TF
Tip Feed. Connects externally to the RLS pin.
21, 23
IC/NP
Internal Connection or No Pin Fitted. This pin is either cropped short or not fitted,
depending on the variant. See Note 1
24
RLS Ringing Loop Sense. Connects externally to the TF pin.
25
IC
Internal Connection. This pin is cropped short.
26
TIP Tip Lead. Connects to the "Tip" lead of a telephone line.
Notes:
1. Variant 1, 4 BD-1 - pins 10,12, & 21 are cropped short. Pin 23 is not fitted.
2. Variant 2 - pin 23 is cropped short. Pins 10, 12 & 21 are not fitted.
3. Variant 3 - pins 12 and 21 are cropped short. Pins 10 and 23 are not fitted.
2-14
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