V1.0 June 2003
Data Sheet
© Silver Telecom 2003
DESCRIPTION
The Silver Telecom Ag1170 is a single Subscriber Line Interface Circuit (SLIC) in a 14 pin single in line (SIL) or 21 pin dual in line (DIL) format. The combination of features and packaging offers extremely efficient use of board area, saving significant system size and cost, minimising time to market for Telephony Systems developers.
The Ag1170 has been designed to work with loop lengths of up to 3.0km (800Ω including telephone). Its performance to regulatory standards (G713) allows use in public and private network applications.
The Ag1170 has integral dc/dc converter and ringing generation thus providing all the line powering requirements from a single supply. The SLIC requires a minimum of external components.
The system interface has been designed for connection to all popular codecs of both the audio and signalling connections.
The Ag1170 is ideal for low line count and high line count, short loop length applications, such as ISDN Terminal Adaptors, Internet Telephony (VoIP), Computer Telephony Integration (CTI), Wireless Local Loops (WLL) and Small Office Home Office (SOHO).
Silver
Ag1170
FEATURES
• A highly featured low power SLIC in a
14 pin SIL or 21 pin DIL format.
•
Integral high efficiency DC/DC
converter. Single +5V or +3.3V supply voltage.
• Highly integrated with on board ringing generator.
• Tip/Ring polarity reversal. On-Hook Transmission for caller line ID.
•
Line and balance impedance programmable with external
components (on Ag1170-P version)
• Easy to use, with a minimum number of external components.
• Simplified protection in “on-premise” applications.
• Silver Telecom “design-in” assistance.
V IN V OUT
TIP RING
Control and Supervision
V1.0 June 2003
Data Sheet
© Silver Telecom 2003Page 2
Ag1170 +5V / +3.3V LOW POWER RINGING SLIC
Ordering Information
Ag1170-D5 +5V Ringing SLIC, DIL package Ag1170-S5 +5V Ringing SLIC, SIL package
Ag1170-D3 +3.3V Ringing SLIC, DIL package Ag1170-S3 +3.3V Ringing SLIC, SIL package
Above Options also available in the Ag1170P, Programmable Impedance Version
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© Silver Telecom 2003 Page 3
Pin #
Name
Description
1 TIP (A) Tip. Connects to the subscriber line Tip.
2 RING (B) Ring. Connects to the subscriber line Ring.
3 IC Internal Connection. Do not connect externally to this pin.
4 SYNC
Synchronization of DC/DC Converter . A logic 0 powers off the
DC/DC converter. Leave open circuit for free run operation. Input
square wave (50:50 m/s) at 128kHz (+5V) or 64kHz (+3.3V) for synchronized operation. DO NOT input logic 1 to this pin 5 NC No Connection. This pin is not connected internally. 6 NC No Connection. This pin is not connected internally.
7 RM
Ringing Mode. Sets bias conditions during ringing. Must be set to logic 1 during ringing. Logic 0 for other modes. 8 GND A Analog Ground. Normally connected to system ground. 9 +V A
唐家寺的雨伞Analog Supply. Connect to the +5V or +3.3V supply via an RC filter, to supply power to the analog circuits.
10 *ZT2
Line Impedance. Connect to ZT1 via impedance programming
components. 11 *ZT1
Line Impedance. Connect to ZT2 via impedance programming
components. 12 *ZB
Balance Impedance. Connect to VIN via impedance
programming components. 13 V IN
Audio In. Analog input signal from the Codec (which is output on Tip and Ring). Connect via a 100nF capacitor.
14 NC No Connection. This pin is not connected internally. 15 V OUT
Audio Out. Analog output signal (from Tip and Ring) to the Codec. Connect via a 100nF capacitor.
Forward/Reverse. A logic 0 will reverse the Tip and Ring voltage polarities. F/R is toggled to produce the ringing output. 17 SHK Switch Hook. Indicates an off-hook condition when at logic 1. 18 GND PWR DC/DC Ground. Ground input for the DC/DC converter. 19 +V PWR DC/DC Supply. +5V or +3.3V input for the DC/DC converter. 20 GND PWR DC/DC Ground. Ground input for the DC/DC converter. 21 +V PWR
DC/DC Supply. +5V or +3.3V input for the DC/DC converter.
* Only used for the Ag1170P device. No Connect for Ag1170 as impedance is programmed to 600R internally
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© Silver Telecom 2003 Page 4
Pin # Name Description素女妙论
1 RING (B) Tip. Connects to the subscriber line Tip.
2 TIP (A) Ring. Connects to the subscriber line Ring.
3 FR
Forward/Reverse. A logic 0 will reverse the Tip and Ring voltage polarities. F/R is toggled to produce the ringing output. 4 RM
Ringing Mode. Sets bias conditions during ringing. Must be set
to logic 1 during ringing. Logic 0 for other modes. 5 SHK Switch Hook. Indicates an off-hook condition when at logic 1. 6 *ZT1 Line. Connect to ZT2 via impedance programming components. 7 *ZT2
Line Impedance. Connect to ZT1 via impedance programming components 8 *ZB
Balance Impedance. Connect to VIN via impedance
programming components 9 V IN Audio In. Analog input signal from the Codec (which is output on Tip and Ring). Connect via a 100nF capacitor
10 V OUT Audio Out. This is the analog output signal (from Tip and Ring) to the Codec. Connect via a 100nF capacitor.
11 +V A Analog Supply. Connected to the +5V or +3.3V supply via an RC filter, to supply power to the analog circuits.
12 GND PWR DC/DC Ground. Ground input for the DC/DC converter. 13 +V PWR
后援
消防车DC/DC Supply. +5V or +3.3V input for the DC/DC converter.
14 SYNC
Synchronization of DC/DC Converter . A logic 0 powers off the DC/DC converter. Leave open circuit for free run operation. Input
square wave (50:50 m/s) at 128kHz (+5V) or 64kHz (+3.3V) for synchronized operation. DO NOT input logic 1 to this pin.
* Only used for the Ag1170P device. No Connect for Ag1170 as the impedances are programmed to 600R internally
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© Silver Telecom 2003 Page 5
2.0 Line Interfacing
As well as being in an electrically demanding environment, the needs of different applications and regulatory standards means that the SLIC must be flexible, and have facilities to ensure robust performance. The Ag1170 SLIC provides a complete and flexible interface to the telephone line.
2.1 Battery Feed
The Ag1170 has an integral DC/DC converter, which generates the battery voltage in the device. This means that only a supply of +5V or 3.3V 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.
营养块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.
Because the line is supplied with only as much power as needed, efficiency is good. Little excess heat is generated, even on short lines.
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), then the Ag1170 will revert to a constant voltage source, allowing the loop to be serviced at a reduced loop current.
2.2 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 5.
During ringing the integral DC/DC converter automatically switches to produce a battery voltage of -72V. This will produce greater than 40Vrms into a REN of 3. 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 Ag1170 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) to remove any spurious pulses. The DC/DC controller limits the power. The Ag1170 will operate continuously with a ring trip load. 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.
2.3 Synchronisation and Power Down
The DC/DC has in internal oscillator. If it is desired to synchronize the frequency with an external clock for EMI reasons, a 128kHz (+5V) or 64kHz (+3.3V) square wave (50:50 mark space) should be input to the SYNC pin.
The DC/DC converter can be switched off by applying a logic 0 to the SYNC input. 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). If not in SYNC mode or PD the SYNC pin should be left open circuit. An open collector gate should be used for applying the PD signal. Never connect a logic high to this pin. See Figure 4 for details.
3.0 The 2-4 Wire (hybrid) Conversion.
The Ag1170 SLIC transmits and receives balanced 2-wire analog signals at the Tip and Ring connections. These are converted to a ground referenced output at
Figure 4: Sync/PD Control
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