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Renesas 821024JG
- Part No.:
- 821024JG
- Manufacturer:
- Renesas
- Category:
- CODECS
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
821024JG.pdf
- Description:
- IC PCM CODEC QUAD NONPROG 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,639
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Product details
Overview
821024JG from Renesas Electronics is a quad-channel, non-programmable PCM codec IC with on-chip digital filters, supporting A-law/μ-law companding, 2.048–8.192 MHz master clock input, single +5.0 V supply, and hardware-adjustable transmit gain via external resistors. It serves as the analog-digital interface in time-division multiplexed telephony systems.
For engineers reviewing the 821024JG datasheet, 821024JG pinout, 821024JG application, or 821024JG equivalent, this device is selected for fixed-configuration voice channel interfacing where deterministic timing, low-power CMOS operation, and per-channel power-down control are required in PBX, central office switch, and digital telephone designs.
Technical Context
The 821024JG integrates four independent PCM codec channels sharing a common MCLK and PCLK, each with dedicated FSXn/FSRn frame sync signals enabling time-slot assignment across up to 128 slots at 8.192 MHz data rate. Its DSP-based digital filtering implements fixed transmit bandpass and receive lowpass responses without firmware configuration.
Transmit gain is set externally per channel using RREF and RTXn resistors; receive gain is fixed at unity. Power-down is controlled individually via PDN1–PDN4 pins, placing analog outputs in high-impedance state during standby - critical for dynamic channel management in multi-line systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent analog-digital voice channels with separate frame sync control |
| Companding Law | Selectable A-law or μ-law via A/μ pin logic level - determines quantization curve per ITU-T G.711 |
| Master Clock (MCLK) | 2.048 MHz / 4.096 MHz / 8.192 MHz - auto-detected; integer multiple of frame sync frequency |
| Data Rate | Up to 8.192 MHz serial PCM (128 time slots) - supports E1/T1 and extended TDM structures |
| Power Supply | +5.0 V single supply - eliminates need for dual or split rails in legacy telephony designs |
| Power Control | Per-channel PDN1–PDN4 pins - enables selective channel shutdown to reduce active power by >70% |
| Analog Interface | Four differential analog inputs (IIN1–IIN4) and outputs (VOUT1–VOUT4); transhybrid balance impedance adjustable via external components |
Pinout & Package
821024JG is available in 32-pin PLCC and 44-pin TQFP packages. Pin functions are identical across both packages except for NC pins and layout-specific routing; the JG suffix corresponds to the 32-pin PLCC variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FSX1–FSX4 | Transmit Frame Sync (per channel) | Defines start of transmit time slot for respective channel; enables independent channel framing |
| FSR1–FSR4 | Receive Frame Sync (per channel) | Defines start of receive time slot for respective channel; supports asynchronous TDM alignment |
| DX | Serial PCM Data Output | Time-multiplexed transmit data stream (MSB-first) for all 4 channels |
| DR | Serial PCM Data Input | Time-multiplexed receive data stream (MSB-first) for all 4 channels |
| PDN1–PDN4 | Channel Power-Down Control | Active-low enable: logic high = channel powered down (high-Z analog outputs) |
| A/μ | Companding Law Select | High = A-law; low = μ-law - sets quantization algorithm per ITU-T G.711 standard |
| MCLK | Master Clock Input | System timing reference; internal PLL derives all internal clocks (ADC/DAC sampling, DSP) |
| PCLK | PCM Clock Output | Derived from MCLK; used to synchronize external PCM interface logic |
Key Features
| Feature | Design Value |
|---|---|
| On-chip digital filters | DSP-implemented fixed transmit bandpass and receive lowpass filters - eliminates external filter components and tuning |
| Hardware gain adjustment | Per-channel transmit gain set via two external resistors (RREF, RTXn) - enables precise line-level calibration without software |
| Independent channel power-down | Four dedicated PDN pins allow selective channel disable - reduces total system power in idle or partial-load conditions |
| Long/Short Frame Sync modes | Supports both ITU-T G.704-compliant long frame (8-bit sync word) and short frame (1-bit sync pulse) - ensures interoperability with legacy and modern TDM systems |
| Transhybrid balance tuning | External component adjustment of hybrid balance impedance - optimizes echo cancellation performance in 2-wire/4-wire conversion |
Applications
| Central Office Switch Line Card | Digital PBX Subscriber Interface |
|---|---|
Use Scenario: Interface between analog subscriber lines and digital switching fabric in Class 5 CO switches. IC Role / Device Role / Timing Role: Quad-channel A/D-D/A converter with embedded TDM framing and G.711 companding. Use Value: Enables direct connection of four POTS lines to a 2.048 Mbps E1 bus without external filtering or clock synthesis. |
Use Scenario: Analog extension port in enterprise-grade digital PBX systems supporting up to 24 simultaneous voice channels. IC Role / Device Role / Timing Role: Fixed-function PCM codec providing synchronized 8 kHz sampling and frame-aligned PCM I/O per channel. Use Value: Reduces BOM count by integrating anti-aliasing, reconstruction, and companding functions into one 32-pin PLCC device. |
| Integrated Voice/Data Access Unit | Digital Telephone Baseband Processor |
Use Scenario: Multi-service access node aggregating voice, fax, and low-speed data over ISDN or DSL backhaul. IC Role / Device Role / Timing Role: Voice channel termination with programmable frame sync polarity and selectable law for mixed-law network environments. Use Value: Supports coexistence of A-law (Europe) and μ-law (North America) traffic on same hardware platform via A/μ pin control. |
Use Scenario: Baseband processing unit in cordless or VoIP-enabled digital telephones requiring local analog line interface. IC Role / Device Role / Timing Role: Low-power, single-supply PCM codec handling handset/mic signal conditioning and PCM transport to host controller. Use Value: Achieves <15 mW per active channel at 5 V, enabling fanless operation and thermal compliance in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel PCM codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC145508P | 3-channel, no on-chip digital filters; requires external anti-aliasing and reconstruction filters | Limited to 3 channels; lacks per-channel power-down and frame sync flexibility | Choose when cost sensitivity outweighs channel count and integration needs |
| TP3054N | Quad-channel but only supports μ-law; no A/μ selection pin; fixed 2.048 MHz MCLK only | Not suitable for A-law networks or variable-clock-rate systems | Choose only for μ-law-only deployments with fixed 2.048 MHz infrastructure |
Compared with MC145508P and TP3054N, the 821024JG provides full A/μ law flexibility, integrated digital filtering, and scalable MCLK support - making it the sole option among the three for mixed-law, multi-rate TDM systems requiring minimal external components.
Availability
821024JG is available at Aetrix Electronics and suitable for central office switch line cards, digital PBX subscriber interfaces, and integrated voice/data access units requiring stable component supply and long-term industrial availability.
Supply support for 821024JG 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for industrial, automotive, and communications markets.
The 821024JG belongs to Renesas' legacy telephony codec product line, designed specifically for fixed-configuration, high-reliability voice channel interfacing in carrier-grade digital switching systems.
FAQ
What is the function of the A/μ pin on the 821024JG?
The A/μ pin on the 821024JG selects the companding law used for PCM encoding and decoding: a logic high configures A-law per ITU-T G.711 Annex A, while a logic low selects μ-law per Annex B. This pin directly controls the quantization step size mapping in both ADC and DAC paths, ensuring interoperability with regional telephony standards without firmware intervention. The 821024JG applies the selected law consistently across all four channels.
Does the 821024JG support both Long and Short Frame Sync modes?
Yes, the 821024JG supports both Long Frame Sync (8-bit sync word) and Short Frame Sync (1-bit pulse) modes as defined in ITU-T G.704. Mode selection is determined by the timing relationship between MCLK and the FSXn/FSRn signals - no register programming is required. This dual-mode capability allows the 821024JG to interoperate with legacy TDM equipment and modern packetized voice gateways without hardware modification.
How is transmit gain configured on the 821024JG?
Transmit gain on the 821024JG is set per channel using two external resistors: RREF (shared) and RTXn (channel-specific), per the equation provided in Figure 1 of the datasheet. Gain is adjusted entirely in the analog domain prior to ADC sampling, enabling precise calibration against line impedance and loop loss. The 821024JG does not support digital gain adjustment - all transmit gain control is resistor-based and hardware-defined.
What package type does the 821024JG use?
The 821024JG uses a 32-pin Plastic Leaded Chip Carrier (PLCC) package, as indicated by the "JG" suffix in the part number. This surface-mount package features a J-lead profile and is RoHS-compliant. It shares functional pinout compatibility with the 44-pin TQFP variant (821024LG), though pin count and NC assignments differ - PCB layout must match the 32-pin PLCC footprint.
Can all four channels of the 821024JG operate simultaneously?
Yes, all four channels of the 821024JG can operate simultaneously, each with independent FSXn/FSRn frame sync signals and time-slot assignment within the 128-slot PCM highway. Simultaneous operation requires proper MCLK frequency selection (e.g., 8.192 MHz for full 128-slot capacity) and individual PDNn pins held low. The 821024JG's architecture ensures deterministic latency and jitter performance across all active channels without resource contention.
821024JG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- PCM, Filter
- Data Interface:
- PCM Audio Interface
- Resolution (Bits):
- -
- Number of ADCs / DACs:
- 4 / 4
- Sigma Delta:
- No
- S/N Ratio, ADCs / DACs (db) Typ:
- -
- Dynamic Range, ADCs / DACs (db) Typ:
- -
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (14x11.46)
821024JG FAQ
1.How can I place an order for 821024JG through Aetrix?
Please submit a Request for Quotation (RFQ) for 821024JG 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 821024JG reliable?
The price and inventory of 821024JG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 821024JG is usually 5 days.
3.What payment methods are accepted for 821024JG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 821024JG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 821024JG?
821024JG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 821024JG 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 821024JG?
For technical support, including 821024JG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 821024JG requirements.
6.How does Aetrix verify that 821024JG is sourced from the original manufacturer or authorized distributors?
All 821024JG 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 821024JG meets industry standards.
7.What is the process for return or replacement of 821024JG?
All 821024JG units undergo pre-shipment inspection (PSI). If there is an issue with 821024JG, 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 821024JG part is unused and in its original packaging.
Return procedure for 821024JG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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