SI3225-KQ - Dual-Channel SLIC/Codec TQFP-64 | Silicon Laboratories
Référence : SI3225-KQ ✓ ActifSI3225-KQ Présentation
A SLIC/codec is an integrated analog telephone line interface that combines the subscriber-line termination and codec functions required between a telephone network and digital voice equipment. In the hierarchy, a SLIC/codec belongs to the broader category of telecom interface ICs, combines analog line-interface and codec functions in one semiconductor, and serves as the bridge between external telephone-line circuitry and a digital voice system. The SI3225 family is specifically positioned for dual-channel analog telephone interfaces.
Key characteristics include two line circuits, a 65 mA supply current rating, operation from either 3.3 V or 5 V, and a 941 mW power rating. The SI3225 supports external bulk-ringer circuitry, while the related Si3200 series also addresses ringing functions. According to the family documentation, the Si3200 linefeed interface family performs all high-voltage functions and can operate from 3.3 V, 5 V, single-battery, or dual-battery supplies, depending on the device and external circuit configuration.
The SI3225 integrates both SLIC and codec functionality into a single IC. Its published interface options include GCI, PCM, and SPI, providing selectable pathways for connecting the device to a voice-processing system. The two-circuit architecture supports dual-channel line-card designs while reducing the number of separate analog-interface devices required. Internal diagnostics add observability for system troubleshooting, and the external bulk-ringer support broadens the available linepower design options.
Typical uses include analog telephone adapters, voice-over-IP line interfaces, customer-premises equipment, digital PBX line cards, voice gateways, and dual-channel VoIP terminal designs. It is particularly relevant where a compact two-line interface is required and external protection, transformers, ringing, and line-interface networks can be implemented around the IC.
System design requires careful separation between low-voltage digital circuitry and telephone-line high-voltage functions. Review the manufacturer pin-description table and recommended external networks before assigning nets. The 0 °C to 70 °C operating range is suitable for commercial-temperature equipment, but it requires confirmation against the enclosure temperature and applicable system qualification requirements.
This product record combines the verified electrical and package characteristics, interface options, functional family information, and application guidance for the SI3225-KQ. It also identifies the limits of current cross-reference results and distinguishes a genuine pin-compatible replacement from a merely similar telecom interface device.
Alternatives de remplacement direct pour SI3225-KQ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesSI3225-KQ Spécifications
| Product Type | Dual-channel SLIC/codec telecom line interface IC |
| Number of Circuits | 2 circuits |
| Supported Interfaces | GCI, PCM, and SPI |
| Tension d'alimentation | 3.3 V or 5 V |
| Courant d'alimentation | 65 mA |
| Power Rating | 941 mW |
| Température de fonctionnement | 0 °C to 70 °C |
| Boîtier | 64-pin thin quad flat package (TQFP) |
| Type de montage | Surface mount |
| Ringing Support | External bulk-ringer support |
| Diagnostics | Internal diagnostics |
| Linefeed Architecture | Si3200 series high-voltage linefeed interface |
| BORSCHT Functions | Performs all BORSCHT functions |
| Channel Integration | SLIC and codec in one IC |
| Lead-Free Status | Contains lead |
Guide de configuration des broches du SI3225-KQ 64-pin thin quad flat package (tqfp)
Configuration des broches du SI3225-KQ (boîtier 64-pin thin quad flat package (tqfp)). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour SI3225-KQ.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
SI3225-KQ convient pour 6 applications: Dual-Line Voice-over-IP Telephone Adapter, Analog PBX Line Card, Voice Gateway Analog-Line Front End, Analog Telephone Adapter, Customer Premises Telephone Equipment, Dual-Channel Voice Processing Front End.
Dual-Line Voice-over-IP Telephone Adapter
The SI3225-KQ fits a dual-line VoIP adapter because it integrates two SLIC/codec channels in one 64-pin TQFP device while offering GCI, PCM, and SPI connectivity to the voice processor. Its two-circuit architecture can reduce the number of dedicated line-interface ICs compared with a one-channel-per-device design. The 3.3 V or 5 V core supply supports conventional digital telephony equipment, while the 65 mA supply-current rating provides a starting point for supply sizing. The external line network, protection elements, bulk ringer, and telephone-line isolation still require separate implementation and must follow the manufacturer reference design.
Recommandé
Analog PBX Line Card
A dual-channel PBX line card can use the SI3225-KQ to provide the subscriber-line and codec functions for two analog extensions. GCI, PCM, and SPI options allow the interface to be matched to the card controller and voice-processing architecture. The integrated SLIC/codec arrangement reduces the number of separate line-interface functions on each channel, while internal diagnostics assist board-level troubleshooting. Because the device supports external bulk-ringer circuitry, the design can implement a ringing network appropriate to the line card while keeping the 3.3 V or 5 V digital core supply separate from the telephone-line domain.
Recommandé
Voice Gateway Analog-Line Front End
The SI3225-KQ is applicable to the analog-line front end of a voice gateway where two subscriber lines must terminate in digital voice circuitry. PCM support provides a conventional parallel voice-data path, while GCI and SPI offer alternatives for compatible system architectures. The 941 mW device power rating and 65 mA supply-current specification help establish the low-voltage supply design, but actual dissipation should be calculated from operating current and VIN. Telephone-line surge protection, isolation, and the external bulk-ringer network remain critical board-level elements outside the IC.
Recommandé
Analog Telephone Adapter
In an analog telephone adapter, the SI3225-KQ supplies the two-channel SLIC and codec functions needed to connect analog handsets or telephone lines to digital voice hardware. Consolidating both channels into one IC simplifies board partitioning compared with two separate single-line interface devices. Its 0 °C to 70 °C operating range suits many indoor commercial products, provided the enclosure remains within that temperature range. The implementation must include the recommended external line network, ringing path, isolation barrier, and surge protection to preserve normal operation and address the voltages present on subscriber lines.
Recommandé
Customer Premises Telephone Equipment
The SI3225-KQ can support two-channel customer-premises equipment where analog subscriber-line termination and voice coding must coexist with a digital control system. Its GCI, PCM, and SPI interfaces provide flexibility in connecting the codec side to different host processors, while internal diagnostics improve fault visibility. The 64-pin TQFP package provides a compact surface-mount solution for multi-function CPE boards. Designers should use the manufacturer's package drawing and pin descriptions to preserve high-voltage spacing around line-connected nodes and to implement the external bulk-ringer support required by the selected line-power topology.
Recommandé
Dual-Channel Voice Processing Front End
The SI3225-KQ is useful as a front end for a dual-channel voice processor handling two analog endpoints. PCM can carry voice samples between the codec and processor, while GCI or SPI can provide control paths suited to the host design. Combining two SLIC/codec channels in one device reduces the number of line-interface packages and can simplify board routing around the digital side of the system. Internal diagnostics provide additional visibility into channel behavior. The design must still account for the 0 °C to 70 °C rating, external telephone-line protection, and the separate high-voltage ringing and linefeed network.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SI3225-KQ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Brand | Silicon Laboratories |
| Package | 64-pin thin quad flat package (TQFP) |
| Number of Circuits | 2 circuits |
| Supply Voltage | 3.3 V or 5 V |
| Supply Current | 65 mA |
| Power Rating | 941 mW |
| Operating Temperature | 0 °C to 70 °C |
| Supported Interfaces | GCI, PCM, and SPI |
| Ringing Support | External bulk-ringer support |
| Diagnostics | Internal diagnostics |
Principaux différenciateurs
- External bulk-ringer support differentiates the SI3225 within its linefeed family. (vs SI3220)
- Two integrated SLIC/codec channels reduce the number of line-interface packages in a dual-line design. (vs Single-channel SLIC/codec implementation)
- Multiple host-interface options support different voice-processing architectures. (vs Single-interface telecom codec)
Notes de conception
Separate the low-voltage digital region from the telephone-line and bulk-ringer region. Place protection, isolation, and the external line network on the line-facing side of the board, and keep their return paths controlled according to the manufacturer reference design. Use the pin-description and package drawings in the SI3225 family datasheet when assigning every one of the 64 pins and when checking high-voltage clearance around the TQFP.
Design the SI3225-KQ low-voltage supply for 3.3 V or 5 V operation and verify it against the device's 65 mA supply-current specification plus local logic and external-circuit requirements. Keep the ringing and linefeed supplies physically and electrically distinct from the core supply where required by the external circuitry. Use nearby decoupling and a low-impedance ground connection to prevent supply noise from disturbing the codec and digital interfaces.
Estimated device dissipation can be calculated as VIN multiplied by actual operating current, using 3.3 V or 5 V as the applicable core input and measured current as the input value. The published 941 mW rating is a device rating rather than an automatic operating-point result. Check the resulting dissipation against the TQFP thermal characteristics and provide adequate ground-plane and copper area under the device without compromising high-voltage isolation clearances.
Do not treat the SI3225 family name as proof that every ordering code has identical ringing, temperature, or package characteristics. Confirm the -KQ suffix against the manufacturer ordering table, and verify whether external bulk-ringer support matches the intended linepower topology. Also avoid assuming that a similarly described dual-channel telecom interface IC is pin-compatible without checking all 64 assignments and the external line network.
Informations de conformité
The published lead-free status states that the part contains lead. No explicit RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals status was identified for the exact SI3225-KQ ordering code.
