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Microchip Technology U4089B-PFNG3Y
- Part No.:
- U4089B-PFNG3Y
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 44-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
U4089B-PFNG3Y.pdf
- Description:
- IC TELECOM INTERFACE 44SSO
- Quantity:
- Payment:
- Shipping:
Inventory:3,931
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Product details
Overview
U4089B-PFNG3Y from Atmel is a monolithic telephone line interface IC for feature phones, answering machines, and fax machines. It integrates speech circuitry, sidetone control, ear protection, acoustical feedback suppression, voice switching, and dual-path adjustable gain amplification (TX/RX), operating from 10-mA line current with built-in 3.3V/2mA regulated supply (VMP) and 7V unregulated supply (VB).
For engineers reviewing the U4089B-PFNG3Y datasheet, U4089B-PFNG3Y pinout, U4089B-PFNG3Y application, or U4089B-PFNG3Y equivalent, this device supports hands-free operation via integrated loudspeaker amplifier (SAO), anti-clipping in both transmit and speaker paths, selectable 600Ω/900Ω line impedance, and DTMF-compatible signal routing - all within a single SSO44 package requiring minimal external components.
Technical Context
The U4089B-PFNG3Y implements a fully integrated analog subscriber set architecture with electronic inductance emulation (via SENSE/IND pins), logarithmic envelope detection for acoustical feedback suppression (AFS), and automatic gain adjustment (AGA) tied to line current. Its voice-switch topology dynamically attenuates either transmit (TXA) or speaker amplifier (SAI) paths based on real-time TX/RX envelope comparison.
It features independent gain control for microphone/DTMF (GT), receive path (GR), and speaker amplifier (GSA), with anti-clipping circuits (TTXA, TSACL) and EMI filtering on MIC1, MIC2, RECIN, and STI pins. The AFS loop maintains constant total gain by coupling GSA reduction to proportional AFS attenuation (ΔG = IAT × 0.67 dB/μA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Package | SSO44 surface-mount package, 18.05 × 10.50 mm body, Pb-free, tape-and-reel packaging |
| Line current operation | Functional down to 10 mA; speaker amplifier enables at ≥15 mA; absolute max 140 mA |
| Supply outputs | VMP = 3.3 V ±0.2 V / 2 mA (regulated); VB = 7.0–7.6 V (unregulated, for voice switch) |
| Transmit gain range | 40–50 dB adjustable via GT pin resistor (RGT = 12kΩ to 27kΩ) |
| Receive gain range | –8 to +2 dB adjustable via GR pin resistor (RGR = 22kΩ to 62kΩ) |
| Speaker amplifier gain | 35.5–37.5 dB (RGSA = 560kΩ); disabled when RGSA > 1.3 MΩ |
| AFS attenuation range | 0–50 dB, controlled by RATAFS; automatically tracks GSA changes to preserve loop stability |
Pinout & Package
U4089B-PFNG3Y uses the SSO44 (Shrink Small Outline) package: 44-pin, 0.8 mm pitch, 18.05 mm × 10.50 mm body, 2.35 mm height, with exposed thermal pad (not electrically connected). Pin 1 is top-left corner, pin 44 bottom-left, numbering counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DTMF | DTMF signal input / hands-free/answering machine mode selector | Accepts tone signals; configures MUTX behavior for confidence signaling during dialing |
| 3 MIC2, 4 MIC1 | Differential microphone amplifier inputs | Symmetrical input pair; CMRR ≥60 dB; EMI filtering integrated |
| 11 SAO | Loudspeaker amplifier output | Capable of 3–20 mW into 50 Ω; anti-clipping attack/release: 5 ms / 80 ms |
| 13 VMP | Regulated 3.3 V supply output | Stable 2 mA source for microcontrollers or logic; used to mute GR/GT when pulled high |
| 20 IMPSEL | Line impedance selection control | Logic-selectable 600 Ω or 900 Ω termination; also controls TXA mute and external supply indication |
| 22 GSA | Speaker amplifier gain setting | Logarithmic gain control; RGSA > 2 MΩ disables SAO; max usable GSA = 36 dB |
| 30 AGA | Automatic gain adjustment reference | RAGA-to-GND sets starting gain; provides ±6 dB dynamic range vs. line current (14–100 mA) |
| 39 RECO | Receive amplifier output | Single-ended output; 10 Ω output resistance; ≤0.5 Vrms into 68nF+100Ω earpiece load |
| 42 RECIN | Receive path input | 80 kΩ input impedance; accepts hybrid or line-side receive signals |
Key Features
| Feature | Design Value |
|---|---|
| Integrated voice switch with loudspeaker amplifier | Enables open-listening/hands-free operation without external switch IC or power stage |
| Acoustical feedback suppression (AFS) | Dynamically balances TXA and SAI attenuation to maintain stable loop gain across GSA adjustments |
| Anti-clipping in transmit and speaker paths | TTXA and TSACL pins allow independent time-constant tuning (0.5–9 ms attack, 8–80 ms release) |
| Selectable line impedance | IMPSEL pin selects 600 Ω or 900 Ω termination to match regional PSTN requirements |
| Built-in ear protection | Clips output to ≤1.1 Vrms under 11 Vrms input, preventing acoustic trauma in handset earpiece |
| EMI filtering on critical I/O | Integrated RC filters on MIC1, MIC2, RECIN, and STI reduce susceptibility to RF ingress |
Applications
| Feature Phones | Answering Machines |
|---|---|
Use Scenario: Full-duplex hands-free calling with sidetone control and noise-resistant DTMF entry. IC Role / Device Role / Timing Role: Line-powered subscriber interface IC handling speech path, echo cancellation, and loudspeaker drive. Use Value: Eliminates need for discrete op-amps, relays, and regulators; reduces BOM count by >12 components versus discrete design. | Use Scenario: Recording and playback with automatic line seizure, message playback, and remote access via DTMF commands. IC Role / Device Role / Timing Role: Dual-mode analog front-end supporting both record (MIC→line) and playback (line→speaker/earpiece) paths. Use Value: Enables low-current standby (<10 mA) and instant wake-on-ring; integrated AFS prevents howling during playback. |
| Fax Machines | Speaker Phones |
Use Scenario: Reliable analog fax transmission over PSTN with precise gain control and line-loss compensation. IC Role / Device Role / Timing Role: Signal conditioning IC providing adjustable TX/RX gain, automatic line-loss compensation (ΔGTI/ΔGRI ≈ –6 dB), and hybrid interface. Use Value: Maintains fax signal integrity across varying line lengths (1–10 km); AGA ensures consistent modulation depth. | Use Scenario: Conference-style speakerphone with full-duplex audio, acoustic echo suppression, and volume-adjustable loudspeaker output. IC Role / Device Role / Timing Role: Central analog baseband processor managing microphone array input, speaker output, and feedback cancellation. Use Value: Achieves >45 dB AFS attenuation while preserving natural voice quality; side-tone suppression adjustable independently of TX/RX gain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telephone line interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SLIC3710DZ | Higher integration: includes digital interface (SPI), programmable DSP-based AEC, but requires external DC-DC converter | Targeted at VoIP gateways and IP phones; not line-powered; lacks integrated VMP/VB generation | Choose SLIC3710DZ only if digital control, network connectivity, or advanced AEC algorithms are required - not for pure analog PSTN designs. |
| TP3067CP | Legacy PCM codec; no integrated line interface, speaker amp, or AFS; requires external hybrid, regulator, and op-amps | Used in basic telephony modems and older PBX systems; lacks hands-free support and ear protection | TP3067CP suits cost-sensitive, low-feature designs where external analog support circuitry is already available. |
Compared with SLIC3710DZ and TP3067CP, U4089B-PFNG3Y uniquely delivers complete analog subscriber functionality - including line power harvesting, regulated supplies, loudspeaker drive, and adaptive AFS - in one SSO44 IC, minimizing external component count and PCB area for legacy PSTN endpoints.
Availability
U4089B-PFNG3Y is available at Aetrix Electronics and suitable for feature phone manufacturing, answering machine production, and fax machine design requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for U4089B-PFNG3Y 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
Atmel Corporation was a leading designer of microcontrollers, capacitive touch solutions, and analog ICs, acquired by Microchip Technology in 2016; its legacy telephony products remain widely deployed in PSTN infrastructure.
The U4089B-PFNG3Y belongs to Atmel's CORD (Communications and Radio Devices) product line, engineered specifically for analog telephone terminal equipment requiring line-powered operation, hands-free capability, and regulatory-compliant ear protection.
FAQ
What is the minimum line current required for U4089B-PFNG3Y to power the loudspeaker amplifier?
The U4089B-PFNG3Y loudspeaker amplifier (SAO) activates at a minimum line current of 15 mA. Below this threshold, the OFFSACOMP signal disables the speaker amplifier group (SAI, SA, SACL, AFS). This ensures reliable hands-free operation only when sufficient line power is available, preventing distortion or dropout during low-current conditions. U4089B-PFNG3Y remains functional for microphone and receive paths down to 10 mA.
How does the AFS (acoustical feedback suppression) function in U4089B-PFNG3Y respond to changes in speaker amplifier gain?
In U4089B-PFNG3Y, AFS attenuation automatically decreases by the same amount as any reduction in speaker amplifier gain (GSA) to maintain constant loop gain - for example, reducing GSA from 36 dB to 30 dB lowers AFS attenuation by 6 dB. This coupling is implemented via internal current summation (IAT = IATAFS – IATGSA – IAGAFS) and ensures stable hands-free operation across all volume settings. U4089B-PFNG3Y achieves up to 50 dB of AFS attenuation.
Can U4089B-PFNG3Y operate with both 600Ω and 900Ω line impedances, and how is selection performed?
Yes, U4089B-PFNG3Y supports both 600Ω and 900Ω line impedances via the IMPSEL pin (Pin 20). Driving IMPSEL low selects 600Ω; driving it high selects 900Ω. The last selected value is stored internally. This allows compliance with regional PSTN standards (e.g., North America 600Ω, Europe 900Ω) without hardware changes. U4089B-PFNG3Y also uses IMPSEL to indicate external supply presence in answering machine mode.
What is the purpose of the VMP pin on U4089B-PFNG3Y, and what load can it drive?
The VMP pin on U4089B-PFNG3Y delivers a regulated 3.3 V ±0.2 V supply capable of sourcing up to 2 mA. It powers peripheral circuits such as microcontrollers, DTMF decoders, or logic interfaces. Critically, applying VMP to GT or GR pins mutes the corresponding microphone or receive amplifier - enabling software-controlled signal gating. U4089B-PFNG3Y relies on VMP for safe, low-noise biasing of sensitive analog blocks.
Does U4089B-PFNG3Y include built-in ear protection, and what is its performance specification?
Yes, U4089B-PFNG3Y includes integrated ear protection that limits maximum output voltage to ≤1.1 Vrms when driven by a 11 Vrms input signal - meeting ITU-T P.56 and EN 60950 safety requirements. This protects users from acoustic trauma during high-level ring signals or fault conditions. The protection operates passively within the receive amplifier stage and requires no external components. U4089B-PFNG3Y maintains this limit across temperature (–10°C to +60°C) and line current (≥14 mA).
U4089B-PFNG3Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Monolithic Integrated Feature Phone Circuit
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- 900 mW
- Operating Temperature:
- -25°C ~ 75°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-SSO
U4089B-PFNG3Y FAQ
1.How can I place an order for U4089B-PFNG3Y through Aetrix?
Please submit a Request for Quotation (RFQ) for U4089B-PFNG3Y 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 U4089B-PFNG3Y reliable?
The price and inventory of U4089B-PFNG3Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for U4089B-PFNG3Y is usually 5 days.
3.What payment methods are accepted for U4089B-PFNG3Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for U4089B-PFNG3Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for U4089B-PFNG3Y?
U4089B-PFNG3Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your U4089B-PFNG3Y 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 U4089B-PFNG3Y?
For technical support, including U4089B-PFNG3Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your U4089B-PFNG3Y requirements.
6.How does Aetrix verify that U4089B-PFNG3Y is sourced from the original manufacturer or authorized distributors?
All U4089B-PFNG3Y 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 U4089B-PFNG3Y meets industry standards.
7.What is the process for return or replacement of U4089B-PFNG3Y?
All U4089B-PFNG3Y units undergo pre-shipment inspection (PSI). If there is an issue with U4089B-PFNG3Y, 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 U4089B-PFNG3Y part is unused and in its original packaging.
Return procedure for U4089B-PFNG3Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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