AG1171

Overview

The Silvertel Ag1171 is a Subscriber Line Interface Circuit (SLIC) housed in a 14-pin single in-line (SIL) package. It operates from a single +3.3V to +5.0V supply, utilizing an internal DC/DC converter to generate the necessary line power and ringing signals without external high-voltage rails. The device provides a constant loop current of 30mA and supports a maximum loop resistance of 470 ohms. Key electrical parameters include a typical on-hook supply current of 60mA at 5.0V, a ringing capability of approximately 60Vrms into three telephones, and a wake-up time of 50ms. The input impedance at Tip/Ring is internally set to 600 ohms.

Feature Summary

• Integrates a high-efficiency DC/DC converter for direct operation from low voltage single supplies.
• Includes an on-board ringing generator producing balanced tip/ring signals via control pins.
• Supports tip/ring polarity reversal and on-hook transmission for caller line identification.
• Features thermal protection and simplified overvoltage handling suitable for on-premise applications.

Applications

• Fixed Cellular Terminals (FCT)
• Fixed Wireless Terminals (FWT)
• Wireless Local Loop (WLL) terminals
• Internet Telephony (VoIP) gateways

Procurement Notes

Verify component authenticity by checking the marking code against the datasheet specifications. Confirm the package format matches the 14-pin SIL requirement. Ensure the supplier provides valid traceability documentation. Cross-reference the part number with official manufacturer catalogs to confirm availability status. Validate that the specific revision aligns with design requirements.

Selection Notes

Select this SLIC for designs requiring minimal external components and board space savings. It is optimized for short loop lengths up to 1km. Ensure the system codec interface matches the 2-wire to 4-wire conversion requirements. Verify that the application environment remains within the recommended operating temperature range. Consider the need for external EMI suppression if used in noisy environments.

Part Context

The Ag1171 belongs to the Silvertel portfolio of telephony interface solutions. It is designed to replace conventional SLICs that require complex multi-rail power supplies. The device simplifies integration for developers creating compact telephony systems. It serves as a core component for connecting analog telephone lines to digital processing units.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

FAQ

How is the ringing signal generated?

Ringing is generated by toggling the F/R pin while setting the RM pin high. This activates the internal DC/DC converter to produce a battery voltage of 72V, resulting in approximately 60Vrms applied to the line.

What is the maximum loop resistance supported?

The Ag1171 supports a maximum loop resistance of typically 470 ohms, which corresponds to a line length of approximately 1km combined with a standard telephone set.

How does the device handle off-hook detection during ringing?

When an off-hook condition occurs, the SHK output switches to logic high. The system must debounce this signal for 10ms and switch the RM pin low within 500ms to limit power dissipation.