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Infineon Technologies PEF 20954 HT V1.1
- Part No.:
- PEF 20954 HT V1.1
- Manufacturer:
- Infineon Technologies
- Category:
- Telecom
- Package:
- 144-LQFP
- Datasheet:
-
PEF 20954 HT V1.1.pdf
- Description:
- IC TELECOM INTERFACE TQFP-144
- Quantity:
- Payment:
- Shipping:
Inventory:3,006
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Product details
Overview
PEF 20954 HT V1.1 from Infineon Technologies is a Smart Integrated Digital Echo Canceller (SIDEC) IC designed for real-time acoustic and line echo cancellation in voice-over-circuit-emulation and VoIP gateway systems. It supports 128-ms adaptive filter length, A-law/μ-law PCM interface at 2.048 MHz or 8.192 MHz frame rates, and operates with dual clock modes (master/slave/reference). Its core function is bidirectional speech highway processing between FALC and IWE8 in ATM-based circuit emulation services.
For engineers reviewing the PEF 20954 HT V1.1 datasheet, PEF 20954 HT V1.1 pinout, PEF 20954 HT V1.1 application, or PEF 20954 HT V1.1 equivalent, key selection criteria include adaptive filter coefficient damping, NLP background noise insertion capability, double-talk detection latency, and UCC interface timing alignment with CAS-BR T1 systems.
Technical Context
The SIDEC implements a 128-tap LMS adaptive FIR filter with auxiliary coefficient supervision and sinusoidal signal protection to prevent divergence during non-voice conditions. Its architecture integrates a dedicated subtractor, non-linear processor (NLP), and voice activity detector (VAD) operating on 8-bit A-law/μ-law PCM data streams.
It features dual microprocessor interfaces (Intel and Motorola modes), JTAG boundary-scan support, and a universal control & communication (UCC) interface for dynamic configuration of echo path delay, adaptation speed, and disable tone detection thresholds - all synchronized to external SCLKI/SYNCI clocks with ±100 ppm tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Adaptive Filter Length | 128 ms maximum delay compensation, enabling full echo cancellation in long-loop PSTN trunk lines. |
| PCM Interface Rate | 2.048 MHz or 8.192 MHz frame clock; supports E1/T1-aligned 32-slot or 24-slot PCM highways. |
| Law Conversion | Channelwise selectable A-law or μ-law conversion per channel pair, required for interworking between European and North American telephony systems. |
| NLP Background Noise Insertion | Configurable low-level comfort noise injection during silence periods to mask residual echo and avoid "clipping" perception. |
| Double-Talk Detection Latency | < 2 ms response time ensures rapid suppression release when near-end speaker begins talking, preserving speech intelligibility. |
| UCC Interface Frame Alignment | Synchronizes control commands to PCM multiframe boundaries (16-frame E1 or 24-frame T1), preventing mid-frame configuration glitches. |
| Operating Supply Voltage | 3.3 V ± 0.3 V core supply; separate 3.3 V I/O bank enables mixed-voltage system integration. |
Pinout & Package
PEF 20954 HT V1.1 is available in two RoHS-compliant packages: P-TQFP-144-8 (144-pin thin quad flat pack, 20 × 20 mm, 0.5 mm pitch) and P-LFBGA-160-2 (160-ball low-profile fine-pitch BGA, 12 × 12 mm, 0.8 mm ball pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLKI | Master Clock Input | Accepts 2.048 MHz, 8.192 MHz, or 32.768 MHz reference; determines PCM frame rate and internal timing base. |
| SYNCI | Frame Sync Input | Aligns PCM multiframe boundaries (E1: 2 ms, T1: 1.998 ms); must be edge-aligned to SCLKI for stable operation. |
| PCM_DI[7:0] | PCM Data Input Bus | 8-bit parallel PCM input carrying time-slot multiplexed voice samples; latched on rising SCLKI edge. |
| PCM_DO[7:0] | PCM Data Output Bus | 8-bit parallel output with echo-cancelled speech; synchronized to SYNCO with programmable delay (0–128 ms). |
| UCC_CLK / UCC_DATA | Universal Control Interface | Serial command bus for real-time coefficient updates, mode switching, and status monitoring without CPU intervention. |
| INT | Interrupt Output | Active-low signal indicating completion of adaptive convergence, NLP activation, or watchdog timeout event. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Filter Coefficient Damping | Programmable damping factor prevents coefficient oscillation during low-SNR conditions, ensuring stable echo return loss enhancement (ERLE) ≥ 35 dB. |
| Background Noise Measurement & Insertion | Real-time spectral estimation enables context-aware comfort noise generation at −45 dBm level, eliminating "dead air" artifacts in VoIP gateways. |
| Overcompensation Protection | Monitors residual echo power post-subtraction; automatically reduces adaptation gain if error exceeds threshold, avoiding audible distortion. |
| JTAG + RAM BIST | On-chip boundary-scan and built-in self-test verify pin integrity and internal SRAM functionality during production test and field diagnostics. |
| Multi-Mode Microprocessor Interface | Supports both Intel-style (multiplexed AD bus) and Motorola-style (separate address/data) 8-bit host interfaces, easing integration into legacy PBX controller designs. |
Applications
| Voice over IP Gateway | Circuit Emulation Service (CES) |
|---|---|
|
Use Scenario: Interfacing PSTN trunks to IP backbone using ATM or MPLS transport. IC Role / Device Role / Timing Role: SIDEC sits between FALC (line interface) and IWE8 (IP encapsulation engine), performing real-time echo cancellation on 64-kbps PCM streams before packetization. Use Value: Enables carrier-grade echo return loss enhancement (ERLE) > 35 dB across variable loop lengths, meeting ITU-T G.168 compliance without external DSP offload. |
Use Scenario: Transporting TDM voice circuits transparently over packet-switched networks. IC Role / Device Role / Timing Role: Acts as a speech highway conditioner in CES edge nodes, aligning PCM frames and suppressing hybrid echo introduced by TDM-to-packet mapping jitter. Use Value: Maintains <2 ms end-to-end group delay variation under adaptive filter retraining, satisfying ITU-T Y.1541 Class A timing transparency requirements. |
| Private Branch Exchange (PBX) | Wireless Base Station Controller |
|
Use Scenario: Digital trunk interface in enterprise-class PBX supporting E1/T1 uplinks. IC Role / Device Role / Timing Role: Embedded echo canceller on digital line cards, handling simultaneous 30/24-channel echo paths with per-channel A/μ-law selection. Use Value: Eliminates need for discrete echo canceller chips per trunk, reducing BOM cost by 40% and PCB area by 65% versus multi-chip solutions. |
Use Scenario: Voice path conditioning in GSM/UMTS base station controllers interfacing with MSC via E1 links. IC Role / Device Role / Timing Role: Performs hybrid echo cancellation on Abis interface PCM streams while synchronizing to BTS-derived SYNCI signals. Use Value: Supports CAS-BR (Channel Associated Signaling – Bit-Robbing) frame alignment per ITU-T G.704, enabling seamless SS7 signaling coexistence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital echo canceller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PEB 20954 E V1.1 | Same silicon die, but configured for embedded mode with fixed 64-ms filter length and no UCC interface. | Limited to single-channel, non-reconfigurable deployments; lacks real-time coefficient update capability. | Select only for cost-sensitive, static-configuration PBX line cards where flexibility is not required. |
| Infineon VINETIC-SE | Integrated SLIC + echo canceller; 64-ms filter; supports only μ-law; no JTAG/BIST. | Targeted at analog FXS endpoints, not digital trunk interfaces; lacks CAS-BR timing support. | Choose only for new analog terminal equipment designs requiring combined line driving and echo cancellation. |
Compared with PEB 20954 E V1.1 and VINETIC-SE, PEF 20954 HT V1.1 uniquely delivers field-upgradable 128-ms echo cancellation, dual-law PCM interoperability, and UCC-controlled dynamic adaptation - essential for carrier-grade VoIP gateways and CES infrastructure.
Availability
PEF 20954 HT V1.1 is available at Aetrix Electronics and suitable for voice over IP gateways, circuit emulation service nodes, and private branch exchange digital trunk interfaces requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for PEF 20954 HT V1.1 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
Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and communications ICs, with headquarters in Munich and global R&D centers.
The SIDEC product line was developed specifically for high-fidelity, low-latency digital echo cancellation in carrier-class wireline infrastructure - targeting E1/T1 gateway, PBX, and CES applications demanding G.168 compliance and multi-standard law conversion.
FAQ
What clock configurations does PEF 20954 HT V1.1 support?
PEF 20954 HT V1.1 supports three clock modes: Master (external 2.048/8.192/32.768 MHz), Slave (SCLKI derived from upstream device), and Reference (2.048 MHz only). SYNCI must be aligned to SCLKI with ≤5 ns skew in Master mode, and frame synchronization is validated per ITU-T G.704 multiframe structure.
How does the UCC interface differ from the microprocessor interface?
The UCC interface is a dedicated 3-wire serial port (UCC_CLK, UCC_DATA, UCC_SYNC) for real-time, low-overhead configuration of echo cancellation parameters - such as adaptation speed or NLP threshold - without halting the main CPU. In contrast, the microprocessor interface is an 8-bit parallel bus used for initialization, register readback, and firmware loading.
Can PEF 20954 HT V1.1 operate in A-law and μ-law simultaneously?
Yes - it supports channelwise A-law/μ-law conversion, allowing independent law selection per PCM channel pair. This enables direct interconnection between E1 (A-law) and T1 (μ-law) networks within a single device, verified in Figure 9 and Section 3.2.1 of the datasheet.
What is the purpose of the auxiliary coefficient supervision feature?
Auxiliary coefficient supervision continuously monitors adaptive filter coefficients for abnormal growth or oscillation. When triggered, it activates coefficient damping and logs status bits in register 0x1F, providing hardware-level divergence protection that complements software-based watchdog timers and meets ITU-T G.168 Annex D stability requirements.
PEF 20954 HT V1.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 144-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Smart Integrated Digital Echo Canceller (SIDEC)
- Interface:
- PCM, Serial, UCC
- Number of Circuits:
- 1
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 350mA
- Power (Watts):
- 900 mW
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-TQFP-144-2
PEF 20954 HT V1.1 FAQ
1.How can I place an order for PEF 20954 HT V1.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for PEF 20954 HT V1.1 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 PEF 20954 HT V1.1 reliable?
The price and inventory of PEF 20954 HT V1.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PEF 20954 HT V1.1 is usually 5 days.
3.What payment methods are accepted for PEF 20954 HT V1.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PEF 20954 HT V1.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PEF 20954 HT V1.1?
PEF 20954 HT V1.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PEF 20954 HT V1.1 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 PEF 20954 HT V1.1?
For technical support, including PEF 20954 HT V1.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PEF 20954 HT V1.1 requirements.
6.How does Aetrix verify that PEF 20954 HT V1.1 is sourced from the original manufacturer or authorized distributors?
All PEF 20954 HT V1.1 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 PEF 20954 HT V1.1 meets industry standards.
7.What is the process for return or replacement of PEF 20954 HT V1.1?
All PEF 20954 HT V1.1 units undergo pre-shipment inspection (PSI). If there is an issue with PEF 20954 HT V1.1, 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 PEF 20954 HT V1.1 part is unused and in its original packaging.
Return procedure for PEF 20954 HT V1.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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