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NXP Semiconductors SAF7843HL/M295,557
- Part No.:
- SAF7843HL/M295,557
- Manufacturer:
- NXP Semiconductors
- Category:
- Encoders, Decoders, Converters
- Package:
- 144-LQFP
- Datasheet:
-
SAF7843HL/M295,557.pdf
- Description:
- IC AUD DECODER 144LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,077
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Product details
Overview
SAF7843HL/M295,557 from NXP Semiconductors is a single-chip CD audio decoder IC integrating ARM7TDMI-S microprocessor (76 MHz), on-die MP3/WMA decoding, digital servo, 110 kB SRAM, 64 kB reprogrammable Flash ROM, and stereo audio DAC with filterless pseudo-bitstream output. It serves as the central signal-processing and control unit in cost-sensitive CD/MP3/WMA playback systems, supporting CLV/CAV modes up to 6× speed and CD-R/CD-RW/CD-DA/CD-MP3/CD-WMA formats.
For engineers reviewing the SAF7843HL/M295,557 datasheet, SAF7843HL/M295,557 pinout, SAF7843HL/M295,557 application, or SAF7843HL/M295,557 equivalent, this page delivers verified technical context, LQFP144 package mapping, real-world servo/audio subsystem integration details, and validated alternative options for automotive infotainment, portable CD players, and legacy multimedia head units.
Technical Context
The SAF7843HL/M295,557 implements a dual-PLL analog clock architecture: a dedicated 67 MHz PLL for channel decoding and a 152 MHz PLL for ARM core and digital subsystems. Its sigma-delta LF ADCs digitize photodiode signals (D1–D4, R1–R2) at 4 MHz PDM for focus/radial/sledge servo loops, while a 6-bit HF ADC processes summed EFM data at 67.7376 MHz.
Digital audio processing includes sample-rate conversion (8–48 kHz → 44.1 kHz), integrated C3 error correction, CD-text decoding, and real-time ARM-based audio algorithms (e.g., bass boost, volume control) applied to both internal CD streams and external AUX_L/AUX_R inputs. The device supports slave I2S-bus synchronization and loopback mode for external I2S/EIAJ sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Processor | ARM7TDMI-S @ 76 MHz (68 MIPS); enables real-time MP3/WMA decode and servo algorithm execution without external CPU. |
| Memory Integration | 130 kB mask-ROM (low-wait-state decompression), 42 kB boot ROM, 64 kB Flash ROM (field-upgradable firmware), 110 kB SRAM (audio buffer + working memory). |
| Audio DAC | Filterless pseudo-bitstream stereo DAC with differential LP/RP outputs; requires only 10 µF/100 nF decoupling per channel - no external reconstruction filters. |
| Sample Rate Conversion | Hardware SRC converts 8–48 kHz compressed audio to fixed 44.1 kHz output - essential for CD-compliant playback and jitter-free DAC timing. |
| Servo Interface | Dedicated PDM outputs (SL_SIN, COS/GPIO31) drive stepper sledge motors; RA/FO outputs control radial/focus actuators; digital servo logic runs entirely on-chip. |
| ADC System | Six LF sigma-delta ADCs (shared D1/D2/AUX_L/AUX_R, dedicated D3/D4/R1/R2) + two GP sigma-delta ADCs (GPIO0–GPIO3); all deliver 10-bit results with digital DC-offset cancellation. |
| Real-Time Clock | Separate 32 kHz crystal interface (OSC_32K_IN/OUT); maintains timekeeping in low-power Standby mode with full system shutdown. |
Pinout & Package
LQFP144 package (20 × 20 × 1.4 mm, 0.5 mm pitch) with 5 V-tolerant digital I/Os, dedicated analog supply domains (VDDA1–VDDA3, VSSA1–VSSA3), and segregated digital core/periphery supplies (VDDD1–VDDD4, VDDP1–VDDP3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SL_SIN (1) | Sledge actuator PDM output | Generates sine-phase waveform for stepper motor sledge positioning - eliminates need for external driver IC. |
| COS/GPIO31 (2) | Sledge actuator PDM output / GPIO | Provides cosine-phase PDM signal; configurable as general-purpose I/O when sledge control not used. |
| LASER (4) & MONITOR (5) | Laser diode drive & monitor feedback | Integrated laser driver supports up to 120 mA; MONITOR input enables closed-loop power regulation across laser lifetime. |
| DAC_LP/DAC_LN (23/24) & DAC_RP/DAC_RN (26/27) | Differential audio DAC outputs | Deliver filterless pseudo-bitstream left/right channels; require only local decoupling (DAC_VREF pin 25) - no external LC filters. |
| AUX_L/AUX_R (15/16) | External analog audio inputs | Enable ARM-based processing (e.g., EQ, bass boost) of tuner or auxiliary sources; share LF ADCs with D1/D2 - mutually exclusive usage. |
| OSC_32K_IN/OUT (30/31) | Real-time clock crystal interface | Supports standalone 32 kHz oscillator for RTC operation during deep sleep - critical for battery-backed timekeeping. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip MP3/WMA decode engine | ARM7 executes compression algorithms using embedded 130 kB ROM + 110 kB SRAM - eliminates external DSP and reduces BOM count by ≥3 ICs. |
| Digital servo with software-configurable algorithms | Microprocessor accesses raw diode signals (D1–D4, R1–R2) and generates RA/FO/SL outputs - enables custom focus tracking or defect-handling logic. |
| Integrated CD-text and subcode Q-channel extraction | Hardware-accelerated parsing of CD-TEXT metadata and subcode data - enables display of track titles, artist names, and elapsed time without host CPU overhead. |
| Eye pattern monitor system | Configurable RF path node selection (via RFControl1[6:4]) routed to HF_MON pin - allows oscilloscope-based tuning of AGC, offset, and noise filter settings. |
| JTAG debug interface (ARM multi-ICE compatible) | Full boundary-scan and ARM core debugging via TDI/TMS/TCK/TRST/TDO pins - supports firmware development and production test without additional hardware probes. |
Applications
| Automotive CD Head Unit | Portable MP3/CD Player |
|---|---|
Use Scenario: Integrated infotainment system playing CD-DA, CD-MP3, and CD-WMA discs in vehicles with temperature-varying environments and vibration-prone mounting. IC Role / Device Role / Timing Role: Central CD/MP3 decoder, servo controller, and audio DAC - manages optical pickup alignment, laser power regulation, and jitter-critical 44.1 kHz audio output. Use Value: Single-chip integration reduces PCB area by >40% vs. discrete decoder + MCU + DAC + servo solution; AEC-Q100 qualification ensures reliability under automotive thermal and EMC stress. |
Use Scenario: Battery-powered handheld device supporting CD playback, MP3 decoding, and auxiliary line-in from FM tuner or microphone. IC Role / Device Role / Timing Role: Audio subsystem SoC - handles disc reading, format decoding, real-time audio processing (bass boost, volume), and low-noise DAC output. Use Value: Programmable ARM clock frequency allows dynamic power scaling; 32 kHz RTC enables wake-on-timer functionality; filterless DAC cuts external component count by 6 passive parts per channel. |
| Legacy Multimedia Desktop Drive | Industrial CD-Based Kiosk |
Use Scenario: PC-connected CD-ROM drive with MP3/WMA playback capability and CD-text display for educational or archival content. IC Role / Device Role / Timing Role: CD channel decoder and host-agnostic audio processor - interfaces via parallel data bus and I2S to host controller while managing all servo and laser functions autonomously. Use Value: On-chip 2 MB external memory interface (address/data bus + CE/OE/WE) enables large firmware storage and audio buffering; UARTs support host diagnostics and firmware updates. |
Use Scenario: Public-access kiosk using CD-ROM Mode 1/2 for software distribution or interactive media, requiring long-term unattended operation and robust error recovery. IC Role / Device Role / Timing Role: Self-contained CD reader controller - performs C3 error correction, multi-session disc handling, and watchdog-timed reset to prevent lockup during extended playback. Use Value: Integrated watchdog timer and power-on reset (RESET pin 100) ensure fail-safe recovery; CD-R/CD-RW compatibility supports field-updatable content; AEC-Q100 grade implies extended temperature tolerance (−40°C to +105°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CD audio decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAA7834HL | Successor IC with enhanced HF ADC resolution (8-bit vs. 6-bit), higher maximum decode speed (8× vs. 6×), and improved AGC/DC offset compensation - but lacks integrated ARM7 and Flash ROM. | Requires external microcontroller for MP3/WMA decode and system control; better suited for high-fidelity CD-only designs where ARM flexibility is unnecessary. | Select SAA7834HL only if prioritizing analog RF performance over integrated processing - SAF7843HL/M295,557 remains optimal for cost-sensitive, self-contained MP3/CD systems. |
| SAF7847HL | Pin-compatible variant within same SAF784x family; identical LQFP144 package, register map, and peripheral set - differs only in mask-ROM content and minor firmware revisions. | Valid drop-in replacement for SAF7843HL/M295,557 in existing designs; supports identical CD/MP3/WMA formats and servo configurations. | SAF7847HL is a direct functional replacement with verified compatibility - use for lifecycle continuity when SAF7843HL/M295,557 reaches end-of-life. |
Compared with SAF7847HL, the SAF7843HL/M295,557 offers identical hardware functionality and pinout but targets earlier firmware revisions and specific OEM calibration profiles; versus SAA7834HL, it trades raw RF fidelity for full system integration - reducing total component count by eliminating external MCU, Flash, and DAC.
Availability
SAF7843HL/M295,557 is available at Aetrix Electronics and suitable for automotive infotainment systems, portable CD/MP3 players, and industrial CD-based kiosks requiring stable component supply, long-lifecycle support, and AEC-Q100-qualified reliability.
Supply support for SAF7843HL/M295,557 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and consumer applications, with headquarters in Eindhoven, Netherlands.
The SAF784x product line was designed specifically for cost-optimized, single-chip CD audio playback systems requiring integrated MP3/WMA decoding, digital servo control, and high-fidelity audio output - targeting automotive head units and portable multimedia devices.
FAQ
What audio formats does the SAF7843HL/M295,557 support natively?
The SAF7843HL/M295,557 natively supports CD-DA (Red Book), CD-R, CD-RW, CD-MP3, CD-WMA, Video CD, and SACD (CD layer only). MP3 and WMA decoding is performed in real time by the on-chip ARM7TDMI-S processor using embedded ROM and SRAM - no external codec IC is required. Format support is confirmed in the official NXP SAF784X_2 datasheet section 2.2.
Does the SAF7843HL/M295,557 include a real-time clock (RTC) function?
Yes, the SAF7843HL/M295,557 integrates a dedicated real-time clock powered by a separate 32 kHz crystal (pins OSC_32K_IN and OSC_32K_OUT). This RTC remains operational in low-power Standby mode while the rest of the chip is powered down - enabling timekeeping for alarm functions or wake-on-timer features without external RTC ICs.
Is the SAF7843HL/M295,557 pin-compatible with other SAF784x variants like SAF7847HL?
Yes, the SAF7843HL/M295,557 is pin-compatible with SAF7847HL and other members of the SAF784x family in LQFP144 package (SOT486-1). They share identical pinout, register mapping, memory interface, and peripheral configuration - differing only in mask-ROM content and minor firmware-level optimizations. SAF7847HL is a validated drop-in alternative.
What is the role of the SL_SIN and COS/GPIO31 pins on the SAF7843HL/M295,557?
SL_SIN (pin 1) and COS/GPIO31 (pin 2) are programmable PDM outputs that generate sine and cosine waveforms to drive stepper motors in the sledge mechanism. This enables precise linear positioning of the optical pickup without external motor drivers. When not used for sledge control, COS/GPIO31 can be configured as a general-purpose I/O (GPIO31).
How does the SAF7843HL/M295,557 handle laser power regulation over the lifetime of the diode?
The SAF7843HL/M295,557 implements closed-loop laser power control using the MONITOR (pin 5) input. It continuously measures laser diode current via the monitor photodiode and adjusts drive current through LASER (pin 4) to maintain nominal output power - compensating for laser aging and temperature drift. Soft-start circuitry limits turn-on slew rate to 1 ms.
SAF7843HL/M295,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 144-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Type:
- Audio Decoder
- Applications:
- Audio CD
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V, 3.3V
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-LQFP (20x20)
SAF7843HL/M295,557 FAQ
1.How can I place an order for SAF7843HL/M295,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for SAF7843HL/M295,557 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 SAF7843HL/M295,557 reliable?
The price and inventory of SAF7843HL/M295,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SAF7843HL/M295,557 is usually 5 days.
3.What payment methods are accepted for SAF7843HL/M295,557?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAF7843HL/M295,557 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SAF7843HL/M295,557?
SAF7843HL/M295,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SAF7843HL/M295,557 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 SAF7843HL/M295,557?
For technical support, including SAF7843HL/M295,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAF7843HL/M295,557 requirements.
6.How does Aetrix verify that SAF7843HL/M295,557 is sourced from the original manufacturer or authorized distributors?
All SAF7843HL/M295,557 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 SAF7843HL/M295,557 meets industry standards.
7.What is the process for return or replacement of SAF7843HL/M295,557?
All SAF7843HL/M295,557 units undergo pre-shipment inspection (PSI). If there is an issue with SAF7843HL/M295,557, 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 SAF7843HL/M295,557 part is unused and in its original packaging.
Return procedure for SAF7843HL/M295,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SAF7843HL/M295,557 Tags
-
MCP2120T-I/SL
Microchip Technology
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LICAL-ENC-MS001
TE Connectivity Linx
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TW9990AT-NA1-GR
Renesas
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TVP5151IPBSR
Texas Instruments
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TVP5150AM1IPBSR
Texas Instruments
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LICAL-DEC-MS001-T
TE Connectivity Linx
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ADV7391BCPZ
Analog Devices Inc.
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ADV7393BCPZ-REEL
Analog Devices Inc.
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ADV7393BCPZ
Analog Devices Inc.
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ADV7391WBCPZ
Analog Devices Inc.
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ADV7181DBCPZ
Analog Devices Inc.
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ADV7181CBSTZ-REEL
Analog Devices Inc.
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