AG1110

Overview

The Silvertel Ag1110 is a single-channel Subscriber Line Interface Circuit (SLIC) designed for low-cost PBX applications. It operates on a single +5V system supply and accepts battery voltages from -42V to -72V, typically -48V. The module provides constant current line feed with voltage fold-over, supporting loop currents of 16mA into 2000Ω loads. It features a 13-pin Single-In-Line (SIL) package with an integral lead frame, measuring 55mm x 13.5mm x 4.0mm. Electrical characteristics include a fixed transmit/receive gain of -1dB, 600Ω input impedance, and short circuit protection. The device ensures low idle power consumption of 20mW and includes integrated relay driver and supervision logic.

Feature Summary

• Highly integrated design requiring minimal external components for board area efficiency.
• Integrated open-collector relay driver for ringing control activation.
• Supports on-hook transmission capability for specific signaling requirements.
• Direct interface compatibility with popular audio codecs for digital conversion.

Applications

• Private Automatic Branch Exchange (PABX) systems
• Computer Telephony Integration (CTI)
• Small Office/Home Office (SOHO) telephony equipment

Procurement Notes

Verify the specific revision level against the V2.9 March 2021 datasheet to ensure component compatibility. Confirm that the application environment supports the specified operating temperature range of 0°C to 70°C. Ensure proper decoupling capacitors are utilized on the power supplies to remove unwanted noise as recommended in the layout guidelines.

Selection Notes

Select this component for high-density line interfacing where cost is a primary constraint and advanced public network signaling is unnecessary. It is suitable for regions utilizing 600Ω line impedance without requiring external impedance programming components. For non-600Ω networks, an intelligent codec must be employed to handle filter characteristic adjustments.

Part Context

The Ag1110 belongs to the Silver Telecom SLIC family, specifically engineered for private branch exchange environments. Unlike modules targeting complex public network standards, this unit focuses on essential line interface functions. It serves as a bridge between analog telephone lines and digital processing systems via direct codec connection.

Replacement Considerations

Public confirmed substitute part numbers: None available.

FAQ

How does the Ag1110 handle long loop lengths?

If the loop length prevents maintaining the preset 25mA constant current, the Ag1110 reverts to a constant voltage source. This allows the loop to be serviced at a reduced current, such as 18.5mA with a 2000Ω loop and -48V battery.

What is the function of the SHK pin?

The Switch Hook Current (SHK) pin indicates when loop current is flowing, such as during an off-hook condition. It outputs a logic 1 when the current exceeds the detection threshold, typically 10mA.

Can the Ag1110 support on-hook transmission?

Yes, by adding a 20k, 0.25W resistor from Tip to Ring, the device can transmit analog signals even when no loop current is flowing. This is useful for sending Caller Line Identification information.