MH88435AS-PI 查看數據表（PDF） - Mitel Networks
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MH88435AS-PI Datasheet PDF : 16 Pages
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MH88435-P
Preliminary Information
NB1 1
NB2 2
VR+ 3
VR- 4
VX 5
LC 6
ZA 7
AGND 8
VCC 9
VBIAS 10
LOOP 11
IC 12
RS 13
IC 14
28 TIP
27 RING
26 IC
25 VLOOP1
24 VLOOP2
23 IC
22 SC
21 SC
20 IC
19 NP
18 NP
17 IC
16 RV
15 LCD
Pin Description
Figure 2 - Pin Connections
Pin # Name
Description
1
NB1 Network Balance 1. External passive components must be connected between this pin
and NB2.
2
NB2 Network Balance 2. External passive components must be connected between this pin
and NB1.
3
VR+ Differential Receive (Input). Analog input from modem/fax chip set.
4
VR- Differential Receive (Input). Analog input from modem/fax chip set.
5
VX
Transmit (Output). Ground referenced (AGND) output to modem/fax chip set, biased at
+2.0V.
6
LC
Loop Control (Input). A logic 1 applied to this pin activates internal circuitry which
provides a DC termination across Tip and Ring. This pin is also used for dial pulse
application.
7
ZA
Line Impedance. Connect impedance matching components from this pin to Ground
(AGND).
8
AGND Analog Ground. 4-Wire ground. Connect to earth.
9
VCC
Positive Supply Voltage. +5V.
10 VBIAS Internal Reference Voltage. +2.0V reference voltage. This pin should be decoupled
externally to AGND, typically with a 10µF 6.3V capacitor.
11
LOOP Loop (Output). The output voltage on this pin is proportional to the line voltage across Tip
- Ring, scaled down by a factor of 50.
12,
IC
Internal Connection. No connection should be made to this pin externally.
14,
17,
20,
23,
26
13
RS
Ringing Sensitivity. Connecting a link or resistor between this pin and LOOP (pin 11) will
vary the ringing detection sensitivity of the module.
15
LCD Loop Condition Detect (Output). Indicates the status of loop current.
16
RV
Ringing Voltage Detect (Output). The RV output indicates the presence of a ringing
voltage applied across the Tip and Ring leads.
2-40
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