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參數資料
| 型號： | AG1171 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | +3.3V / +5.0V Low Power Ringing SLIC |
| 中文描述： | 3.3 / 5.0V低功耗振鈴用戶接口 |
| 文件頁數： | 6/16頁 |
| 文件大小： | 228K |
| 代理商： | AG1171 |
V1.0 Dec 2006
Data Sheet
Ag1171
+3.3V / +5.0V Low Power Ringing SLIC
5. Functional Description
5.1. Line Interfacing
As well as being used in an electrically demanding environment, the needs of different
applications and regulatory standards means that the SLIC must be flexible, and have
facilities to ensure robust performance. The Ag1171 SLIC provides a complete and flexible
interface to the telephone.
5.2. Battery Feed
The Ag1171 has an integral DC/DC converter, which generates the battery voltage in the
device. This means that only a single supply of between +3.3V to +5.0V is needed, unlike
conventional SLICs which will also need a battery voltage of anything between 20V and
60V ( 75V for ringing). This confers a significant cost, space and time to market benefit on
the equipment designer.
The battery feed to the telephone line is generated from the positive supply rail. This
provides a 48V battery feed to the line driver, which is adjusted automatically to match line
conditions. In Forward mode the Ring voltage is negative with respect to the Tip voltage.
Power efficiency is good, because the line is supplied with only as much power as is
needed. Little excess heat is generated, even on short lines. The loop current is pre-set to
a constant 30mA, under the conditions shown in Section 10.3 of this datasheet, which
specifies the ‘DC Electrical Characteristics’ for the Ag1171.
5.3. Ringing
The ringing signal is generated by switching the SLIC into ringing mode, by setting the RM
pin high, and then toggling the F/R pin at the required frequency and cadence. The
toggling of the F/R pin produces a balanced signal at Tip and Ring. These signal
waveforms are shown in Figure 3. Ringing voltage of approximately 60Vrms is applied to a
single telephone set. It is important that the RM pin is only set high during ringing and that
this pin is set low at all other times.
During ringing the integral DC/DC converter is switched by RM (H) to produce a battery
voltage of 72V. This will produce greater than 40Vrms into 3 telephones (with tone
ringers). The slope of the edges on the ringing waveform is set internally to give the
correct waveform with 20Hz to 25Hz ringing frequency.
When an “off-hook” condition occurs during ringing, the ring-trip circuit on the Ag1171
senses the loop current flowing and signals the off-hook condition on the SHK output. The
SHK signal must be “de-bounced” (by the controlling processor) for 10ms to remove any
spurious pulses. The DC/DC controller limits the power. The Ag1171 will operate
continuously with a ring-trip load (but this is not recommended as the power dissipation is
high). The ring-trip function will operate up to a loop resistance of typically 470R (including
300R telephone).
Silver Telecom 2006
6
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