le9500 Zarlink Semiconductor, le9500 Datasheet - Page 12

• Manufacturer Part Number: le9500
• Description: Igh-voltage Ringing Slic Device For Volp Applications
• Manufacturer: Zarlink Semiconductor

Pre-trip immunity
Ringing will not be tripped by the following loads across Tip and Ring as shown in the reference schematic in the this document.
Ringing frequency = 17 Hz to 23 Hz otherwise specified.
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OPERATING STATES
Operating State Definitions
Forward Active
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Reverse Active
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Scan
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On-Hook Transmission—Forward Battery
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10-kΩ resistor in parallel with 5 Ringer Equivalency Number (REN) (equivalent of 1386-Ω + 40-µF) per GR-909 Issue 2,
December 2004
10-kΩ resistor in parallel with a 2-µF capacitor in parallel with 5 Ringer Equivalency Number (REN) (equivalent of 1386-Ω +
40-µF) per GR 57 Issue 1 October 2001.
Pin PT is positive with respect to PR.
V
Loop closure and common-mode detect are active.
Ring trip detector is turned off to conserve power.
Overhead is set to nominal 7.2 V for undistorted transmission of 3.14 dBm into 900 Ω with 500 mVrms of PPM.
Pin PR is positive with respect to PT.
V
Loop closure and common-mode detect are active.
Ring trip detector is turned off to conserve power.
Overhead is set to nominal 7.2 V for undistorted transmission of 3.14 dBm into 900 Ω with 500 mVrms of PPM.
Except for loop closure, all circuits (including ring trip and common-mode detector) are powered down.
On-hook transmission is disabled.
Pin PT is positive with respect to PR and V
The tip to ring on-hook differential voltage will be typically between –44 V and –51 V with a –51 V to –100 V primary battery.
Pin PT is positive with respect to PR.
V
Supervision circuits, loop closure, and common-mode detect are active.
Ring trip detector is turned off to conserve power.
BAT2
BAT2
BAT1
Table 7. Control States
Table 8. Supervision Coding
0 = off-hook or ring trip or thermal shutdown or ring ground.
1 = on-hook and no ring trip and no thermal shutdown and no ring ground.
is applied to tip/ring drive amplifiers.
is applied to tip/ring drive amplifiers.
is applied to tip/ring drive amplifiers.
B0
0
0
0
0
1
1
1
1
B1
0
1
0
1
1
0
1
0
B2
1
1
0
0
0
0
1
1
BAT1
Forward active
Reverse active
On-hook transmission forward battery
On-hook transmission reverse battery
Ground start
Scan
Disconnect (default device power up state)
Ring
Zarlink Semiconductor Inc.
is applied to tip/ring.
NSTAT
12
Operating State