73M1906B-IVT/F

Overview

The 73M1906B-IVT/F is a Host-Side Data Access Arrangement (DAA) component within the 73M1966B MicroDAA family, designed for Foreign-Exchange-Office (FXO) Voice-over-IP applications. It provides digital data, control interfaces, and power to the paired 73M1916 Line-Side Device via an isolated pulse transformer barrier rated up to 6 kV. The device features a PCM highway interface supporting E-1 and T-1 standards with automatic clock rate detection, alongside an SPI control interface capable of daisy-chaining up to 16 devices. Operating at 8 kHz or 16 kHz sampling rates, it includes an ITU-T G.711 compliant codec with selectable μ-law and A-law companding modes, as well as a 16-bit linear mode. The host-side unit supports transmit and receive digital gain adjustments ranging from -18 dB to +7.375 dB in 0.125 dB increments.

Feature Summary

• Integrated isolation barrier using a small pulse transformer to transfer both power and data to the line-side components, ensuring reliable operation against EMI and line voltage variations.
• Supports global DAA compliance including FCC, ETSI ES 203 021-2, JATE, and other PTT standards through functional programmability.
• Includes call progress monitoring, Caller ID Type I and II support, ring detection, pulse dialing, billing tone detection, and polarity reversal detection.

Applications

• VoIP equipment requiring PSTN connectivity for emergency service calling
• PBX systems needing redundancy for supplementary voice connectivity
• Computer telephony integration appliances
• POTS termination equipment

Procurement Notes

Verify that the specific ordering suffix matches the required package type, either the 20-pin TSSOP or the 32-pin QFN, as pinouts differ significantly between these options. Confirm the industrial temperature range rating (-40 °C to +85 °C) aligns with the target deployment environment. Ensure the design utilizes the correct pulse transformer specified in the datasheet to maintain the 6 kV isolation barrier integrity and proper synchronization across the barrier.

Selection Notes

Select this component when a split-host architecture is required to separate the digital processing logic from the high-voltage line-side circuitry. The 73M1906B serves specifically as the host-side controller; ensure the system design pairs it with the corresponding 73M1916 line-side device. Consider the 73M1866B if a single-package solution is preferred over the two-device MicroDAA configuration. Verify that the application requires the specific PCM highway master/slave capabilities and SPI daisy-chain functionality provided by this family.

Part Context

The 73M1906B functions exclusively as the host-side element of the 73M1966B device set. It does not connect directly to the telephone line but instead manages the digital interface and powers the 73M1916 line-side device. This separation allows for flexible PCB layout and distinct voltage domain management between the low-voltage digital host and the analog line interface.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The 73M1866B offers a single-package alternative but lacks the specific host/line-side split architecture.