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參數(shù)資料
| 型號： | AG1160A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 5V RINGING SLIC |
| 中文描述： | 5V的振鈴用戶接口 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 161K |
| 代理商： | AG1160A |
V1.8 October 2006
Data Sheet
1.0 Line Interfacing
As well as being in an electrically demanding
environment, the needs of different applications and
regulatory standards means that the SLIC must allow
flexibility, together with facilities to ensure robust
performance. The Ag1160 SLIC provides a complete
and flexible interface to the telephone line.
1.1 Battery Feed
The Ag1160 has an integral DC-DC converter, which
generates the battery voltages in the device. This
means that only a supply of +5V, and GND is needed,
unlike conventional SLICs, which will 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 -36V
battery feed to the line driver (-24V for Ag1160A),
except during ringing, when this is increased to -72V.
For applications, which require –48V feed voltage
during the on hook state (eg. some fax machines), a
bleed resistor can be provided. However this will
increase the idle current.
The Ag1160A is designed for use in low power short
loop applications, and provides a battery feed of –24V
to the line.
The loop current is pre-set to a constant 24mA. If the
loop length is such that the constant current feed
cannot be maintained (i.e. >3km, or 0.5km for
Ag1160A), then the Ag1160 will revert to a constant
voltage source, allowing the loop to be serviced at a
reduced loop current.
1.2 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.
During
ringing
the
integral
automatically switches to produce a battery voltage of
-72V. This will produce greater than 40V rms into a
REN of 3. The slope of the edges on the ringing
waveform is determined by the value of the slew rate
capacitor connected between the CAP pin and Ground.
A 220nF capacitor is recommended with 20Hz ringing.
When an “off-hook” condition occurs during ringing, the
ring-trip circuit on the Ag1160 senses the loop current
flowing and signals the off-hook condition on the SHK
Ag1160
5V RINGING SLIC
Silver Telecom 2006
Page 4
DC-DC
converter
output. The SHK signal must be “debounced” to
remove any spurious pulses by the controlling
processor. On detection of SHK the ringing signal
must be removed from the F/R pin and RM taken to a
logic 0 within 500ms to avoid excessive power
dissipation in the line driver circuit. The ring-trip
function will operate correctly up to a maximum loop
resistance of around 800R (including telephone), which
corresponds to around 3km loop length. It is
recommended that a 10K pull-down resistor is fitted to
RM.
1.3 Loop Off and Power Down
The loop current can be removed from the line by
switching the LO input to a logic 1. This can be used
as a power denial to the line or to present a very high
impedance to the line. Typically used when carrying
out maintenance on the line, or to suspend service
during a line fault, etc.
The DC-DC converter can be switched off by applying
a logic 1 to the PD input. This reduces the current
consumption to a nominal 15mA. The SLIC takes
50ms to power up from this powered down state.
When using the power down state it is recommended
that the SLIC is polled (powered up periodically) to
check for SHK (the subscriber has gone off hook).
2.0 The 2-4 Wire (hybrid) Conversion.
The Ag1160 SLIC transmits and receives balanced
2-wire analog signals at the Tip and Ring connections.
These are converted to a ground referenced output at
V
OUT
IN
.
V
OUT
and V
IN
are normally connected to a Codec for
conversion to and from a digital Pulse Code Modulated
(PCM) stream.
2.1 Transmit and Receive Gain.
The gain in both the transmit direction (Tip/Ring to
V
OUT
) and the receive direction (V
IN
to Tip/Ring) is set to
0dB. Normally any gain adjustments required by the
user can be made by programming the Codec.
2.2 The 2 Wire Impedance.
The input impedance (at Tip/Ring), Zin, of the SLIC is
set to 600R. For countries where the line impedance is
600R e.g. North America, no external adjustment is
required. For countries where an alternative line
impedance is used the Codec filter characteristics can
be programmed to give the required matching.
The Codec manufacturer can provide information on
how Codec programming is done. Programmable
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相關(guān)代理商/技術(shù)參數(shù) |
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| AG1160A-48 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5V RINGING SLIC |
| AG11692 | 制造商:Molex 功能描述:LOCKNUT PG9 *52003500* |
| AG1170 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:+5V / +3.3V Low Power Ringing SLIC |
| AG1170-D3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:+5V / +3.3V Low Power Ringing SLIC |
| AG1170-D5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:+5V / +3.3V Low Power Ringing SLIC |
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