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IC-Hersteller Maxim Integrated

Maxim Integrated 73M1866B

MicroDAA with PCM Highway


Eingangsspannung-0.5-5.5 V
Ausgang 10.45 V


The 73M1866B and 73M1966B use the Teridian patented Data Access Arrangement function (MicroDAA®) designed exclusively for Foreign-Exchange-Office (FXO) in Voice-over-IP (VoIP) applications. These devices provide much of the circuitry required to connect PCM formatted voice channels to a PSTN via a two-wire twisted pair interface. The package options provide the necessary functional programmability and protection required for easy worldwide homologation.

The family of devices consists of the 73M1866B and the 73M1966B. The 73M1866B MicroDAA is the world’s first single-package silicon Data Access Arrangement (DAA). Suitable applications for the 73M1866B and 73M1966B devices include VoIP equipment that must provide connectivity to the PSTN for purposes of guaranteeing emergency service calling, redundancy for supplementary connectivity for voice, and maintenance services.

The 73M1966B device set consists of the 73M1906B Host-Side Device that provides digital data, control interfaces and power to the 73M1916 Line-Side Device.

These devices are based on an innovative and patented technology, which sets new standards in reliability and cost. A small pulse transformer forms a digital isolation barrier, transferring both power and data to the PSTN line-side components. This method results in reliable operation in the presence of EMI and a tolerance to line voltage variations by providing power to the Line-Side Device across the barrier. The devices also support the ability to provide up to an additional +6 dB of analog gain to the line-side transmit and +3 dB in the receive signal paths. The device supports transmit and receive digital gain ranging from –18 dB to +7.375 dB by increments of 0.125 dB.

The digital side provides a PCM highway interface with automatic clock rate detection. With an 8-kHz sampling rate, the devices include an ITU-T G.711 compliant codec with selectable μ-law and A-law companding modes. The devices also provide a 16-bit linear mode, which is suitable for interfacing with wide band codecs, as well as 16 kHz sampling rate. Device control is performed over an SPI interface. The SPI supports daisy chain operation.


    • PCM highway data interface supporting both slave and master modes
    • PCM highway interface supporting both E-1 and T-1
    • SPI control interface, with daisy chain support for up to 16 devices
    • Designed to meet global DAA compliance FCC, ETSI ES 203 021-2, JATE and other PTT standards.
    • 8 kHz and 16 kHz sample rates
    • 16-bit linear mode
    • TX and RX gains adjustable in 0.125 dB increments
    • μ-Law, A-law ITU-T Recommendation G.711 compliant compander operation
    • Automatic clock rate detection
    • Low power modes
    • Polarity Reversal detection
    • GPIO for user-configurable I/O ports
    • Call Progress Monitor
    • Isolation up to 6 kV
    • THD -80 dB
    • 5 V tolerant I/O on selected pins
    • 3.0 V – 3.6 V operating voltage
    • Industrial temperature range (-40 °C to +85 °C)
    • 5x5 mm 32-pin QFN or 20-pin TSSOP packages
    • RoHS compliant (6/6) lead-free package

Typische Anwendungen

  • Voicemail Systems
  • PBX Systems
  • Voicemail Systems
  • Computer Telephony
  • Internet Appliances
  • POTS Termination Equipment

Weiterführende Informationen


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