Analog Devices Inc./Maxim Integrated 73M1906B-IVTR/F

Overview

73M1906B-IVTR/F from Teridian Semiconductor is a host-side digital interface IC for MicroDAA™ systems, enabling PCM-based voice channel connection between VoIP processors and PSTN line-side devices (e.g., 73M1916). It supports 8/16 kHz sampling, G.711 µ-law/A-law companding, SPI daisy-chain control, and provides programmable transmit/receive gain from –18 dB to +7.375 dB in 0.125 dB steps. Used in VoIP gateways requiring FCC/ETSI-compliant DAA functionality.

For engineers reviewing the 73M1906B-IVTR/F datasheet, 73M1906B-IVTR/F pinout, 73M1906B-IVTR/F application, or 73M1906B-IVTR/F equivalent, this page delivers verified package mapping (20-pin TSSOP), confirmed SPI/PCM timing behavior, real-world gain resolution, isolation barrier interface logic, and validated alternatives for FXO system design.

Technical Context

The 73M1906B-IVTR/F operates as the host-side controller in a split-architecture MicroDAA system, communicating digitally with the line-side 73M1916 via an isolated pulse transformer barrier. It implements full PCM highway interface with automatic clock rate detection and supports both master and slave modes for E1/T1 compatibility.

Control is handled over a 4-wire SPI interface supporting up to 16-device daisy chains; device configuration includes selectable companding law, gain registers, call progress monitoring, polarity reversal detection, and GPIO management-all accessible through dedicated control/status registers.

Key Specifications

Pinout & Package

73M1906B-IVTR/F is housed in a RoHS-compliant 20-pin Thin Shrink Small Outline Package (TSSOP) with exposed thermal pad. Pin functions are defined per Table 1 of DS_1x66B_001 Rev. 1.6.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DAA host-interface applications.

Compared with Si3217x and SLIC2000, the 73M1906B-IVTR/F offers modular isolation barrier architecture, embedded call progress monitoring, and seamless PCM highway integration-making it optimal for designs prioritizing regulatory flexibility, field-serviceable line-side units, and reduced analog design burden.

Availability

73M1906B-IVTR/F is available at Aetrix Electronics and suitable for VoIP gateways, PBX systems, and internet fax terminals requiring stable component supply, long-lifecycle support, and global regulatory compliance assurance.

Supply support for 73M1906B-IVTR/F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Teridian Semiconductor was a fabless analog/mixed-signal IC company specializing in highly integrated communications solutions before its acquisition by Maxim Integrated in 2010.

The 73M1906B-IVTR/F belongs to the MicroDAA™ family, designed specifically to replace discrete DAA components in VoIP endpoints while meeting global PSTN interface standards including FCC Part 68 and ETSI ES 203 021-2.

FAQ

What is the primary function of the 73M1906B-IVTR/F in a MicroDAA system?

The 73M1906B-IVTR/F serves as the host-side digital interface IC in a split-architecture MicroDAA system. It manages PCM data exchange, SPI-based configuration, and real-time line-event detection for the companion 73M1916 line-side device. The 73M1906B-IVTR/F does not connect directly to the telephone line-it communicates across an isolated barrier to handle all digital control and signal processing tasks required for PSTN interface compliance.

Does the 73M1906B-IVTR/F support both µ-law and A-law companding?

Yes, the 73M1906B-IVTR/F implements full ITU-T G.711 compliance with selectable µ-law and A-law companding modes. This selection is controlled via SPI register configuration and applies to both transmit and receive paths. The 73M1906B-IVTR/F also supports 16-bit linear mode for wideband audio applications, making it adaptable to regional PSTN requirements and advanced voice codecs.

What package type is used for the 73M1906B-IVTR/F?

The 73M1906B-IVTR/F is supplied in a 20-pin TSSOP package (4.4 mm × 6.5 mm body, 0.65 mm pitch) with an exposed thermal pad. This package matches the pinout defined in Table 1 of DS_1x66B_001 Rev. 1.6 and is distinct from the 32-pin QFN variant used in other members of the 73M1x66B family. The TSSOP variant is optimized for cost-sensitive, high-volume VoIP endpoint designs.

Can the 73M1906B-IVTR/F operate independently without the 73M1916 line-side device?

No-the 73M1906B-IVTR/F is designed exclusively as the host-side component of the 73M1966B DAA pair and requires the 73M1916 line-side device to complete the PSTN interface. It lacks line-driving capability, high-voltage protection, and analog loop closure circuitry. The 73M1906B-IVTR/F relies on the isolation barrier to power and communicate with the 73M1916, and cannot function as a standalone DAA.

What SPI configuration does the 73M1906B-IVTR/F support?

The 73M1906B-IVTR/F supports standard 4-wire SPI with daisy-chain capability for up to 16 devices. It operates in either 8-bit or 16-bit transaction mode, with configurable CPOL/CPHA settings to match host controller timing. All device registers-including gain, companding law, detector thresholds, and GPIO states-are accessed via this interface, and the 73M1906B-IVTR/F includes dedicated status flags for interrupt-driven operation.