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NXP Semiconductors SAA7706H/N210S,518
- Part No.:
- SAA7706H/N210S,518
- Manufacturer:
- NXP Semiconductors
- Category:
- DSP (Digital Signal Processors)
- Package:
- 80-BQFP
- Datasheet:
-
SAA7706H/N210S,518.pdf
- Description:
- IC DSP CAR RADIO 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,129
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Product details
Overview
SAA7706H/N210S,518 from NXP Semiconductors (formerly Philips Semiconductors) is a car radio–specific digital signal processor (DSP) integrating dual sigma-delta ADCs, RDS demodulation, FM/AM stereo decoding, and quad-channel FSDAC audio output. It operates at 3.3 V supply, supports 44.1 kHz audio sampling, delivers >85 dB SNR on CD/TAPE inputs, and enables independent front/rear seat audio processing in automotive head units.
For engineers reviewing the SAA7706H/N210S,518 datasheet, SAA7706H/N210S,518 pinout, SAA7706H/N210S,518 application, or SAA7706H/N210S,518 equivalent, key selection criteria include its integrated FM interference absorption circuit (IAC), dual-media source routing capability, RDS data buffering via dedicated pins (RDS_CLOCK/RDS_DATA), and compatibility with 5 V-tolerant digital interfaces including I2S, SPDIF, and I²C-bus.
Technical Context
The SAA7706H/N210S,518 implements two 5-bitstream 3rd-order sigma-delta ADCs for stereo analog sources (CD, TAPE, AUX) and one 1-bitstream 1st-order sigma-delta ADC for RDS-level acquisition. Its digital audio path includes a 128×-oversampled 4-bitstream FSDAC with integrated noise shaper and interpolation filter-eliminating need for external post-filtering.
Signal processing is partitioned across two DSP cores: DSP1 handles FM/AM level analysis, stereo decoding, and RDS update logic; DSP2 manages baseband audio controls (5-band parametric EQ, dynamics compression, Dolby-B tape NR at 44.1 kHz), while both support I²C-bus configuration and flag-based inter-core coordination via DSP1_IN/OUT and DSP2_INOUT pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3 V ±10% (VDD); separate 3.3 V analog/digital rails reduce crosstalk |
| Audio Input SNR | 90 dB (CD/TAPE/AUX at 1 kHz, 20 kHz BW, 0.55 V RMS ref) |
| FM MPX Input THD+N | −65 dB (0.368 V RMS, 1 kHz, 19 kHz BW) - meets automotive weak-signal fidelity requirements |
| Digital Audio Interfaces | I²S-bus (LSB-justified 16/18/20/24-bit), dual SPDIF inputs, and I²C-bus (400 kHz fast mode) |
| Operating Temperature | −40 °C to +85 °C - qualified for under-dash automotive environments |
| Crystal Oscillator | 11.2896 MHz fundamental-mode crystal - generates all internal clocks via PLL |
| RDS Support | Dedicated RDS_CLOCK and RDS_DATA pins with buffered output and clock/data recovery logic |
Pinout & Package
Package: QFP80 (SOT318-2), plastic quad flat package, 80 leads, body size 14 × 20 × 2.8 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDACP / VDACN1 / VDACN2 | Analog reference voltage network | Positive/negative references for all ADCs and level-ADC; require local decoupling to VSSA1/VDDA1 for <85 dB SNR |
| FM_MPX / FM_RDS | FM multiplex and RDS analog inputs | High-GSM-immunity pins; SEL_FR pin enables fast tuner search by switching between FM_MPX and FM_RDS paths |
| FRV / FLV / RRV / RLV | Quad FSDAC audio outputs | Front/rear left/right voltage outputs; short-circuit protected; support voice-over mixing for PHONE/NAV signals |
| RDS_CLOCK / RDS_DATA | RDS interface signals | Open-drain outputs with internal pull-ups; enable buffered RDS data transfer without external latching |
| IIS_IN1 / IIS_IN2 / IIS_OUT1 / IIS_OUT2 | Co-processor I²S interface | Support external audio co-DSP or headphone amplifier; word-select and clock outputs simplify system-level synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Dual-media audio routing | Independent front-seat (FRV/FLV) and rear-seat (RRV/RLV) source selection and volume control - enables zone-based infotainment |
| Integrated FM interference absorption (IAC) | Hardware-accelerated suppression of GSM burst noise without CPU overhead - critical for cellular-integrated head units |
| On-chip 5-band parametric equalizer | Configurable per-channel gain, center frequency, and Q factor - eliminates need for external DSP firmware tuning |
| Dolby-B tape NR (44.1 kHz only) | Real-time noise reduction applied during tape playback - preserves high-frequency detail while attenuating hiss |
| Soft mute and zipper-noise suppression | Interpolated volume transitions prevent audible "stepping" artifacts during dynamic range compression or fade events |
Applications
| Automotive AM/FM Radio Head Unit | Multi-Zone In-Vehicle Entertainment System |
|---|---|
Use Scenario: High-end OEM car radio supporting simultaneous AM/FM reception, CD playback, and RDS traffic announcements. IC Role / Device Role / Timing Role: Central audio signal processor handling tuner IF demodulation, stereo decoding, RDS extraction, and analog-to-digital conversion before power amplification. Use Value: Integrated FM IAC and GSM-immune analog inputs ensure clean audio in cellular-rich environments; pin-compatible upgrade path from SAA7705/SAA7708 simplifies platform migration. |
Use Scenario: Dual-zone head unit delivering independent audio content to front and rear passengers via separate source inputs and volume controls. IC Role / Device Role / Timing Role: Dual-media routing engine managing discrete signal paths for front (CD/phone) and rear (tape/navigation) sources with synchronized DAC output timing. Use Value: Eliminates need for secondary DSP or analog switches; reduces BOM count and PCB area while enabling voice-over for navigation prompts without muting primary audio. |
| CD-Based Automotive Infotainment | Tape-Enhanced Legacy Audio System |
Use Scenario: CD changer–integrated head unit requiring de-emphasis, 5-band EQ, and spectrum analysis for visual feedback. IC Role / Device Role / Timing Role: Digital audio processor performing CD de-emphasis, treble/bass/fader/balance control, and real-time 9-band mono spectrum analysis. Use Value: On-chip spectrum analyzer feeds display driver directly; no host MCU intervention required - lowers system latency and frees CPU resources. |
Use Scenario: Retrofit audio system supporting legacy cassette deck with Music Search System (MSS) detection and Dolby-B noise reduction. IC Role / Device Role / Timing Role: Tape signal conditioner implementing MSS tone detection, tape equalization curves, and Dolby-B encoding/decoding at 44.1 kHz sample rate. Use Value: Restores fidelity of analog tape sources; MSS detection enables automatic track skipping - improves usability without external microcontroller logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar car radio DSP applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAA7705H/N210S,518 | Lower integration: lacks RDS demodulator, single stereo ADC, no dual-media routing | Suitable for cost-sensitive AM/FM-only radios without RDS or rear-seat audio | Select when RDS and multi-zone features are not required; lower pin count and reduced software complexity |
| SAA7708H/N210S,518 | Enhanced feature set: adds digital AM CQUAM stereo decoder and improved AM co-channel rejection | Required for markets mandating AM stereo broadcast compliance (e.g., North America) | Choose for AM stereo–enabled platforms; retains full pin and software compatibility with SAA7706H/N210S,518 |
Compared with SAA7705H/N210S,518 and SAA7708H/N210S,518, the SAA7706H/N210S,518 provides the optimal balance of RDS capability, dual-media routing, and FM interference suppression - making it the preferred choice for mid-tier automotive head units requiring future-proofing without AM stereo licensing overhead.
Availability
SAA7706H/N210S,518 is available at Aetrix Electronics and suitable for automotive infotainment systems, OEM head unit production, and RDS-enabled radio designs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SAA7706H/N210S,518 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 acquired Philips Semiconductors' standard products division in 2006 and continues to support legacy automotive ICs with full documentation and long-term supply commitments.
The SAA7706H/N210S,518 belongs to Philips' car radio DSP family designed specifically for analog/digital hybrid head units - emphasizing integrated RF front-end conditioning, robust GSM immunity, and seamless RDS/CD/tape/phone source convergence.
FAQ
What is the function of the POM pin on the SAA7706H/N210S,518?
The POM (Power-On Mute) pin on the SAA7706H/N210S,518 controls mute timing for the quad FSDAC during power-up. An external capacitor connected to POM sets the mute release delay, preventing audible "plop" noise at startup. This timing is independent of DSP core initialization and ensures clean audio ramp-up after VDD stabilization - a critical requirement for automotive audio systems where abrupt transients are unacceptable. The SAA7706H/N210S,518 datasheet specifies capacitor value vs. mute duration curves for design validation.
Does the SAA7706H/N210S,518 support Dolby-B noise reduction for all sample rates?
No, Dolby-B tape noise reduction in the SAA7706H/N210S,518 is explicitly limited to 44.1 kHz operation, as confirmed in Section 1.2 (Software) of the datasheet. It is not available at 32 kHz or 48 kHz sampling rates. This constraint arises from fixed-coefficient FIR filter implementation optimized for CD-standard timing. Attempting Dolby-B processing at other rates will result in incorrect spectral shaping and degraded noise suppression. The SAA7706H/N210S,518 must be configured for 44.1 kHz I²S input when Dolby-B is enabled.
How does the LEVEL pin interface with tuner circuits in the SAA7706H/N210S,518?
The LEVEL pin on the SAA7706H/N210S,518 accepts a DC-coupled analog voltage (0–3.3 V) representing AM or FM signal strength from the tuner's RSSI or AGC output. Internally, this feeds a dedicated 9-bit sigma-delta level-ADC clocked at 38 kHz, producing a 76 kHz decimated stream used by DSP1 for soft mute, sliding stereo, and multipath detection. The SAA7706H/N210S,518 requires no external conditioning - its high-impedance input allows direct connection to tuner output buffers, and the 14 mV LSB resolution enables precise field-strength quantization across the full dynamic range.
Can the SAA7706H/N210S,518 process both SPDIF1 and SPDIF2 inputs simultaneously?
No, the SAA7706H/N210S,518 supports only one active SPDIF input at a time - either SPDIF1 (pin 25) or SPDIF2 (pin 24) - selected via I²C-bus configuration bit. Both inputs share the same internal SPDIF bitslicer and recovery logic; concurrent use would cause signal contention and undefined behavior. The selection is software-controlled and can be changed dynamically during operation, but hardware arbitration is not implemented. The SAA7706H/N210S,518 datasheet explicitly prohibits simultaneous SPDIF input assertion in Section 7 (Pinning) and Section 8.14 (Digital Serial Inputs/Outputs).
Is the SAA7706H/N210S,518 pin-compatible with newer NXP automotive DSPs?
The SAA7706H/N210S,518 is pin-compatible with the SAA7705H/N210S,518 and SAA7708H/N210S,518 within the same QFP80 package (SOT318-2), as stated in Section 1.1 (Hardware) of the datasheet. However, it is not pin-compatible with later-generation NXP TDA7xxx or UJA1xxx families - those use different pinouts, voltage domains, and interface protocols. Migration beyond the SAA77xx series requires PCB redesign. The SAA7706H/N210S,518 remains supported for legacy program continuity, but no roadmap extensions to newer packages exist.
SAA7706H/N210S,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 80-BQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Car Signal Processor
- Interface:
- I2C, I2S, LSB, SPDIF
- Clock Rate:
- -
- Non-Volatile Memory:
- -
- On-Chip RAM:
- -
- Voltage - I/O:
- 3.30V
- Voltage - Core:
- 3.30V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-PQFP (14x20)
SAA7706H/N210S,518 FAQ
1.How can I place an order for SAA7706H/N210S,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SAA7706H/N210S,518 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 SAA7706H/N210S,518 reliable?
The price and inventory of SAA7706H/N210S,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SAA7706H/N210S,518 is usually 5 days.
3.What payment methods are accepted for SAA7706H/N210S,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAA7706H/N210S,518 transactions.
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4.How is shipping managed for SAA7706H/N210S,518?
SAA7706H/N210S,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SAA7706H/N210S,518 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 SAA7706H/N210S,518?
For technical support, including SAA7706H/N210S,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAA7706H/N210S,518 requirements.
6.How does Aetrix verify that SAA7706H/N210S,518 is sourced from the original manufacturer or authorized distributors?
All SAA7706H/N210S,518 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 SAA7706H/N210S,518 meets industry standards.
7.What is the process for return or replacement of SAA7706H/N210S,518?
All SAA7706H/N210S,518 units undergo pre-shipment inspection (PSI). If there is an issue with SAA7706H/N210S,518, 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 SAA7706H/N210S,518 part is unused and in its original packaging.
Return procedure for SAA7706H/N210S,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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