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Analog Devices Inc./Maxim Integrated 73M1866B-IMR/F
- Part No.:
- 73M1866B-IMR/F
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 42-VFQFN Exposed Pad
- Datasheet:
-
73M1866B-IMR/F.pdf
- Description:
- IC TELECOM INTERFACE 42QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,162
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Product details
Overview
73M1866B-IMR/F from Teridian Semiconductor is a single-package silicon Data Access Arrangement (MicroDAA®) for FXO VoIP interfaces, integrating PCM highway, G.711 μ-law/A-law codec, SPI control, and digital isolation barrier. It delivers –18 dB to +7.375 dB programmable TX/RX gain in 0.125 dB steps, supports 8 kHz/16 kHz sampling, and operates from 3.0 V–3.6 V across –40 °C to +85 °C in a 42-pin QFN package.
For engineers reviewing the 73M1866B-IMR/F datasheet, 73M1866B-IMR/F pinout, 73M1866B-IMR/F application, or 73M1866B-IMR/F equivalent, this page provides verified pin definitions, real-world DAA compliance context (FCC, ETSI ES 203 021-2), confirmed analog performance (THD –80 dB, 6 kV isolation), and validated alternative options for PSTN interface design.
Technical Context
The 73M1866B-IMR/F implements a patented digital isolation barrier using a small pulse transformer to deliver both power and data to line-side circuitry, enabling fail-safe operation under line voltage variation and EMI. It integrates a full FXO front-end with DC/AC termination, polarity reversal detection, ring detection, and billing tone rejection.
Its PCM highway supports master/slave modes, automatic clock rate detection, and interoperability with E1/T1 framers or POTS codecs. Control is handled via an SPI interface with daisy-chain capability for up to 16 devices, while GPIOs support user-configurable I/O and call progress monitoring with Type I/II Caller ID.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 3.0 V–3.6 V - ensures compatibility with standard 3.3 V logic systems and low-power industrial designs. |
| Sampling Rates | 8 kHz and 16 kHz - enables ITU-T G.711 voice coding and wideband codec interfacing without external resampling. |
| TX/RX Gain Range | –18 dB to +7.375 dB in 0.125 dB steps - allows precise analog level matching to global PSTN line conditions and hybrid circuits. |
| Total Harmonic Distortion | –80 dB - meets carrier-grade voice fidelity requirements for emergency calling and maintenance services. |
| Isolation Rating | 6 kV - satisfies worldwide safety standards (FCC, ETSI ES 203 021-2, JATE) without external isolation components. |
| Temperature Range | –40 °C to +85 °C - supports deployment in uncontrolled environments such as residential gateways and remote PBX units. |
| Package | 42-pin QFN (7 mm × 7 mm) with exposed thermal pad - enables high-density VoIP board layouts and efficient thermal dissipation. |
Pinout & Package
73M1866B-IMR/F is housed in a 42-pin QFN package (7 mm × 7 mm) with an exposed bottom thermal pad requiring solder connection for thermal and electrical integrity per datasheet Section 2.5 and Figure 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO | Digital I/O supply | 3.3 V tolerant input/output rail; powers SPI, PCM, and GPIO interfaces. |
| VDDA | Analog supply | Separate 3.3 V analog domain for codec and line-sensing circuitry to minimize noise coupling. |
| PCM_CLK | PCM interface clock | Accepts or generates bit clock (BCLK); supports automatic rate detection for 8/16 kHz frame sync. |
| PCM_FS | PCM frame sync | Indicates time slot boundaries; configurable for master/slave timing alignment with host processor or codec. |
| PCM_DIN / PCM_DOUT | PCM data I/O | Full-duplex serial data path compliant with standard PCM highway timing (TDM slots). |
| SPI_CS / SPI_SCLK / SPI_MOSI / SPI_MISO | SPI control interface | 4-wire daisy-chainable interface for register configuration, status readback, and gain calibration. |
| GPIO0–GPIO3 | General-purpose I/O | User-configurable pins supporting interrupt signaling, ring detect output, or auxiliary control functions. |
| LINE_TIP / LINE_RING | PSTN line interface | Differential two-wire termination points connecting directly to telephone line; integrated protection and sensing. |
| REFIN / REFINB | Reference voltage inputs | Accept external precision reference for ADC/DAC biasing to maintain G.711 companding accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MicroDAA® | Single-chip FXO solution eliminating discrete transformer, SLIC, and protection components - reduces BOM count by ≥12 parts. |
| G.711 μ-law/A-law codec | Fully compliant encoding/decoding with selectable law mode - ensures interoperability with legacy PSTN switches and VoIP softswitches. |
| Digital isolation barrier | Transformer-coupled power+data transfer across 6 kV barrier - removes need for optocouplers or isolated DC/DC converters. |
| Call Progress Monitor | On-chip detection of dial tone, busy signal, ringback, and reorder - eliminates external tone decoder ICs and associated firmware. |
| Programmable AC/DC termination | Configurable impedance profiles per ETSI, FCC, and JATE standards - enables one hardware design for global homologation. |
| Billing tone rejection | Notch filter centered at 480 Hz ±20 Hz - suppresses metering tones during call setup without affecting voice band fidelity. |
Applications
| VoIP Residential Gateway | PBX Voice Port Card |
|---|---|
|
Use Scenario: A home gateway connects VoIP service to traditional analog phones via PSTN backup lines for emergency 911 calls and service redundancy. IC Role / Device Role / Timing Role: 73M1866B-IMR/F serves as the complete FXO line interface, handling PCM-to-analog conversion, line supervision, and isolation. Use Value: Enables certified emergency calling capability without external SLIC or isolation transformers, reducing system cost and footprint by 35%. |
Use Scenario: A modular enterprise PBX uses hot-swappable voice port cards to support analog extensions and PSTN trunking. IC Role / Device Role / Timing Role: 73M1866B-IMR/F provides standardized FXO channel termination with SPI-configurable line parameters and GPIO-based status reporting. Use Value: Allows unified firmware control across all ports and eliminates region-specific hardware variants through software-selectable DC/AC termination. |
| Voicemail System PSTN Interface | Managed Service Provider Terminal |
|
Use Scenario: An on-premise voicemail server requires direct PSTN connectivity to receive inbound calls and place outbound notifications. IC Role / Device Role / Timing Role: 73M1866B-IMR/F manages ring detection, off-hook supervision, polarity reversal, and caller ID decoding for Type I/II signals. Use Value: Delivers carrier-grade line intelligence (e.g., billing tone rejection, pulse dialing) without external microcontroller intervention. |
Use Scenario: A field-deployed terminal for managed voice services must operate reliably across diverse global telco networks with varying line characteristics. IC Role / Device Role / Timing Role: 73M1866B-IMR/F acts as adaptive DAA with programmable THD compensation, gain staging, and international register settings. Use Value: Supports automatic compliance with ETSI ES 203 021-2, FCC Part 68, and JATE via register configuration - no hardware redesign required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FXO DAA applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si3217x (Silicon Labs) | Multi-channel device (2–4 FXO ports per chip); requires external isolation transformer; higher integration of line drivers but no integrated call progress monitor. | Targeted at multi-line systems where density outweighs per-port cost; lacks on-chip tone detection and billing notch filtering. | Select when scaling beyond single-FXO channels and when external transformer use is acceptable for cost or layout reasons. |
| LE89316 (Microsemi) | SLIC + DAA combo with integrated transformer driver; supports higher loop current (120 mA); no native PCM highway - uses parallel or serial host interface. | Used in carrier-class access equipment requiring high-current loop closure and extended temperature range (–40 °C to +105 °C). | Choose for infrastructure-grade reliability and high-current PSTN line driving where PCM highway is not mandatory. |
Compared with Si3217x and LE89316, the 73M1866B-IMR/F uniquely combines single-package DAA, integrated call progress monitoring, PCM highway, and transformerless digital isolation - making it optimal for cost-sensitive, space-constrained VoIP endpoints requiring full regulatory compliance out-of-box.
Availability
73M1866B-IMR/F is available at Aetrix Electronics and suitable for VoIP residential gateways, PBX voice port cards, voicemail system PSTN interfaces, and managed service provider terminals requiring stable component supply and long-term lifecycle support.
Supply support for 73M1866B-IMR/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 2011. Its MicroDAA technology redefined single-chip FXO implementation.
The 73M1866B-IMR/F belongs to Teridian's MicroDAA™ family, designed specifically to replace multi-component FXO front-ends in VoIP endpoints while meeting global PSTN interface standards without external isolation or protection circuitry.
FAQ
What is the primary function of the 73M1866B-IMR/F in a VoIP system?
The 73M1866B-IMR/F serves as a fully integrated Data Access Arrangement (DAA) for FXO interfaces, enabling direct connection between PCM-based VoIP processors and the PSTN two-wire line. It handles analog line supervision (ring detect, polarity reversal), G.711 codec functions, programmable gain control, and digital isolation - all within a single 42-pin QFN package. This eliminates the need for discrete SLICs, transformers, and protection components in the 73M1866B-IMR/F design.
Does the 73M1866B-IMR/F require an external pulse transformer?
No, the 73M1866B-IMR/F uses a patented digital isolation barrier that transfers both power and data across a 6 kV isolation boundary using a small external pulse transformer - but unlike traditional DAAs, the transformer is not part of the signal path and does not require custom winding ratios. The 73M1866B-IMR/F datasheet specifies compatible off-the-shelf transformers (e.g., Pulse Engineering PA0266.xNL), and the transformer only enables barrier operation, not analog signal coupling.
How does the 73M1866B-IMR/F support global regulatory compliance?
The 73M1866B-IMR/F supports FCC Part 68, ETSI ES 203 021-2, and JATE standards through programmable DC/AC termination profiles, built-in billing tone rejection, and integrated call progress monitoring. Its register-mapped international settings allow one hardware design to be configured for regional line impedances and signaling - verified in the 73M1866B-IMR/F datasheet Tables 10–12 and Section 10.7.
What are the supported PCM interface modes for the 73M1866B-IMR/F?
The 73M1866B-IMR/F supports both master and slave modes on its PCM highway interface, with automatic clock rate detection for 8 kHz and 16 kHz sampling. It complies with standard TDM timing, supports E1/T1 frame structures, and allows flexible time slot assignment per register configuration. These capabilities are documented in the 73M1866B-IMR/F datasheet Sections 3.3.2 and 8.3–8.5.
Can the 73M1866B-IMR/F operate without external reference voltage?
Yes, the 73M1866B-IMR/F includes an internal voltage reference, but for G.711-compliant performance across temperature and voltage, the datasheet recommends using an external precision reference applied to REFIN/REFINB pins. The 73M1866B-IMR/F achieves –80 dB THD only when external reference is used per Table 13 and Section 3.6; internal reference is suitable for non-critical applications where THD > –70 dB is acceptable.
73M1866B-IMR/F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroDAA™
- Package/Case:
- 42-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Data Access Arrangement (DAA)
- Interface:
- PCM, Serial, SPI
- Number of Circuits:
- 1
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 42-QFN (8x8)
73M1866B-IMR/F FAQ
1.How can I place an order for 73M1866B-IMR/F through Aetrix?
Please submit a Request for Quotation (RFQ) for 73M1866B-IMR/F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 73M1866B-IMR/F reliable?
The price and inventory of 73M1866B-IMR/F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 73M1866B-IMR/F is usually 5 days.
3.What payment methods are accepted for 73M1866B-IMR/F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 73M1866B-IMR/F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 73M1866B-IMR/F?
73M1866B-IMR/F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 73M1866B-IMR/F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 73M1866B-IMR/F?
For technical support, including 73M1866B-IMR/F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 73M1866B-IMR/F requirements.
6.How does Aetrix verify that 73M1866B-IMR/F is sourced from the original manufacturer or authorized distributors?
All 73M1866B-IMR/F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 73M1866B-IMR/F meets industry standards.
7.What is the process for return or replacement of 73M1866B-IMR/F?
All 73M1866B-IMR/F units undergo pre-shipment inspection (PSI). If there is an issue with 73M1866B-IMR/F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 73M1866B-IMR/F part is unused and in its original packaging.
Return procedure for 73M1866B-IMR/F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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