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NXP Semiconductors SAA7706H/N210,557
- Part No.:
- SAA7706H/N210,557
- Manufacturer:
- NXP Semiconductors
- Category:
- DSP (Digital Signal Processors)
- Package:
- 80-BQFP
- Datasheet:
-
SAA7706H/N210,557.pdf
- Description:
- IC CAR RADIO DSP 80-QFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
SAA7706H/N210,557 from NXP Semiconductors (formerly Philips Semiconductors) is a car radio–specific digital signal processor (DSP) integrating dual-media audio processing, digital FM/AM stereo decoding, RDS demodulation, and 4-channel FSDAC output. It features five sigma-delta ADCs (three stereo, one mono, one level), four-bitstream DACs with 128× oversampling, and operates across −40 °C to +85 °C for automotive head unit applications.
For engineers reviewing the SAA7706H/N210,557 datasheet, SAA7706H/N210,557 pinout, SAA7706H/N210,557 application, or SAA7706H/N210,557 equivalent, key selection considerations include its QFP80 package, I²C-bus control interface, dual front/rear seat audio source support, integrated interference absorption circuit (IAC), and compatibility with CD, TAPE, AUX, PHONE, NAV, AM, and FM MPX analog inputs plus SPDIF/I²S digital inputs.
Technical Context
The SAA7706H/N210,557 implements two independent DSP cores (DSP1 at 50 MHz, DSP2 at 62.9 MHz) handling real-time FM/AM weak-signal processing, stereo decoding, Dolby-B tape noise reduction, and 5-band parametric equalization. Its analog front-end includes three sigma-delta ADCs-two 5-bitstream stereo (ADC1/ADC2), one 1-bitstream mono (ADC3 for RDS)-plus a dedicated level-ADC for tuner signal quality monitoring.
Digital audio paths support simultaneous I²S/LSB-justified and SPDIF inputs, while the Filter Stream DAC (FSDAC) delivers four analog outputs (FLV, FRV, RLV, RRV) with integrated interpolation filtering, noise shaping, and power-on mute (POM) timing controlled by external capacitor. The device uses a single 11.2896 MHz crystal oscillator with PLL-derived internal clocks and supports MOST bus interfacing via external controller.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–3.6 V; powers digital core (VDDD3V1–VDDD3V4), analog sections (VDDA1/VDDA2), and oscillator (VDD(OSC)) independently for noise isolation. |
| DSP Core Frequencies | DSP1 runs at 50 MHz, DSP2 at 62.9 MHz; enables concurrent FM stereo decoding, RDS processing, and multi-band EQ without external co-processor. |
| ADC Architecture | Two 5-bitstream 3rd-order sigma-delta stereo ADCs + one 1-bitstream 1st-order mono ADC + dedicated level-ADC; provides anti-aliasing broadband input filtering and GSM-immune analog inputs. |
| FSDAC Output | Four-channel 4-bitstream DAC with 128× oversampling and integrated noise shaper; eliminates need for external post-filtering and supports short-circuit protected audio outputs. |
| Input Support | FM_MPX, AM_L/NAV, AM_R/AM, CD_L/CD_R, TAPE_L/TAPE_R, AUX_L/AUX_R, PHONE, NAV, SPDIF1/SPDIF2, I²S-bus; all analog inputs feature high CMRR and GSM immunity. |
| Interface | I²C-bus (fast-mode compatible, 400 kHz), test pins (TSCAN/RTCB/SHTCB), and programmable flag I/O (DSP1_IN1/OUT2, DSP2_INOUT1–4); enables full configuration and diagnostics without JTAG. |
| Operating Temperature | −40 °C to +85 °C; qualified for under-dash automotive environments with no derating required up to maximum junction temperature. |
Pinout & Package
Package: QFP80 (plastic quad flat package, 80 leads, body size 14 × 20 × 2.8 mm, lead length 1.95 mm, SOT318-2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDACP / VDACN1 / VDACN2 | Analog reference voltage inputs | Provide positive/negative references for ADC1/2/3 and level-ADC; require direct connection to VDDA1/VSSA1 for optimal SNR and CMRR. |
| LEVEL | Tuner signal level input | Accepts 0–3.3 V DC level signal from AM/FM tuner; digitized by dedicated 9-bit sigma-delta ADC for multipath and field strength calculation in DSP1. |
| POM | Power-on mute control | External capacitor sets mute release timing for FSDAC outputs; prevents audible "plop" during power-up and ensures silent boot sequence. |
| FM_MPX / FM_RDS | FM multiplex and RDS analog inputs | High-GSM-immunity inputs supporting simultaneous stereo decoding and RDS data recovery; SEL_FR pin selects between FM_MPX and FM_RDS paths. |
| IIS_OUT1 / IIS_OUT2 | Digital audio outputs | Drive external I²S receivers (e.g., subwoofer, headphones); clocked by IIS_CLK and word-selected by IIS_WS for synchronized multi-zone playback. |
| RDS_CLOCK / RDS_DATA | RDS interface signals | Provide buffered RDS bit clock and serial data output; support RDS update processing including pause detection and signal-quality freeze without host MCU intervention. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Media Support | Enables independent front-seat (FLV/FRV) and rear-seat (RLV/RRV) audio sources and volume control-no external switching logic required. |
| Integrated Interference Absorption Circuit (IAC) | Hardware-accelerated FM interference suppression; operates autonomously without DSP firmware overhead, improving weak-signal reception in urban environments. |
| Digital FM Stereo Decoder | On-chip 19 kHz MPX filter, de-emphasis, and stereo detection; eliminates need for external analog decoder ICs and reduces BOM count by ≥3 components. |
| RDS Demodulator with Buffer | Dedicated mono ADC + RDS clock/data recovery block; buffers decoded RDS data for host readout via I²C, enabling display updates without interrupt latency. |
| Audio Output Short-Circuit Protection | Hardware-level current limiting on all four FSDAC outputs (FLV/FRV/RLV/RRV); sustains indefinite short-to-ground without latch-up or thermal shutdown. |
| Boot-Up ROM | Embedded fast-start firmware loads DSP configuration within 100 ms of power-on; eliminates external PROM and reduces system boot time versus software-loaded alternatives. |
Applications
| Front/Rear Dual-Zone Audio System | FM/AM Radio Head Unit with RDS Display |
|---|---|
Use Scenario: Automotive infotainment system delivering independent audio content to driver/front passenger and rear passengers via separate left/right front and rear outputs. IC Role / Device Role / Timing Role: SAA7706H/N210,557 acts as central audio signal processor-handling analog/digital source selection, FM/AM decoding, RDS parsing, and 4-channel DAC output generation with synchronized sample rates. Use Value: Eliminates need for discrete stereo decoders, RDS ICs, and multi-channel DACs; reduces PCB area by >35% versus discrete solution while enabling seamless dual-zone volume/tone control. |
Use Scenario: High-end car radio supporting FM stereo, AM CQUAM stereo (where enabled), RDS text/data display, and dynamic loudness compensation. IC Role / Device Role / Timing Role: SAA7706H/N210,557 performs real-time FM/AM signal processing-including soft mute, sliding stereo, high-cut filtering, and RDS update-with hardware-accelerated IAC and stereo decoder blocks. Use Value: Achieves −70 dB THD and 81 dB SNR on FM input, enabling clear audio even at low signal-to-noise ratios; RDS buffer allows display refresh without CPU polling overhead. |
| Tape/CD Source Integration Module | Phone/Navigation Voice-Over System |
Use Scenario: OEM head unit accepting analog CD changer, cassette deck, and auxiliary line-in sources with automatic tape equalization and Music Search System (MSS) detection. IC Role / Device Role / Timing Role: SAA7706H/N210,557 digitizes CD/TAPE/AUX inputs via stereo sigma-delta ADCs, applies Dolby-B noise reduction (at 44.1 kHz), and performs tape EQ/MSS detection in DSP2 firmware. Use Value: Supports legacy tape functionality with digital precision-MSS detection enables instant track search; Dolby-B processing improves perceived SNR by ≥10 dB without analog circuitry. |
Use Scenario: Hands-free calling and turn-by-turn navigation with voice-over capability-temporarily ducking music during phone ring or navigation prompt. IC Role / Device Role / Timing Role: SAA7706H/N210,557 routes PHONE/NAV inputs through dedicated CMRR stages, mixes them into front DAC channels with programmable volume, and triggers voice-over mute via DSP1-controlled fader/volume scaling. Use Value: Delivers tone-sequenced ring alerts and intelligible voice prompts at ≥85 dB(A) SNR; voice-over transitions occur in <15 ms with zero zipper noise due to e-power interpolation. |
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 | Pin-compatible but lacks RDS demodulator and dual-media support; reduced ADC count (two stereo only, no level-ADC). | Suitable for cost-sensitive AM/FM-only radios without RDS or rear-seat audio; cannot replace SAA7706H/N210,557 in RDS-enabled or dual-zone systems. | Select only if RDS and rear-zone outputs are unnecessary; verify tuner interface compatibility-SAA7705H requires external level sensing. |
| SAA7708H | Pin-compatible with enhanced DSP2 clock (75 MHz), added SPDIF transmitter, and extended I²C memory map; identical ADC/DAC architecture. | Supports higher-bandwidth digital interconnect (e.g., optical SPDIF out) and faster audio processing; retains full SAA7706H/N210,557 feature set. | Drop-in upgrade path when additional processing headroom or digital output capability is needed; no PCB changes required. |
Compared with SAA7705H, SAA7706H/N210,557 adds RDS demodulation and dual-zone audio routing-critical for premium navigation-equipped vehicles-while SAA7708H extends performance headroom and digital I/O without altering analog signal chain design.
Availability
SAA7706H/N210,557 is available at Aetrix Electronics and suitable for automotive infotainment systems, OEM head unit production, and RDS-enabled car radio designs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SAA7706H/N210,557 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 (formerly Philips Semiconductors) is a global leader in automotive and secure connectivity solutions, with deep expertise in mixed-signal ICs for infotainment and telematics.
The SAA7706H/N210,557 belongs to NXP's car radio DSP family designed specifically for high-fidelity, feature-rich automotive audio processing-integrating FM/AM decoding, RDS, multi-source mixing, and parametric EQ in a single QFP80 package.
FAQ
What is the primary function of the SAA7706H/N210,557 in automotive audio systems?
The SAA7706H/N210,557 serves as a fully integrated car radio digital signal processor, performing FM/AM stereo decoding, RDS demodulation, analog/digital source mixing, baseband audio processing (tone, balance, fader, dynamics), and 4-channel DAC output generation. It replaces multiple discrete ICs-including analog decoders, RDS chips, and multi-channel DACs-in modern head units, reducing system complexity and board space while maintaining high-fidelity audio performance across −40 °C to +85 °C.
Does the SAA7706H/N210,557 support both FM and AM stereo decoding?
Yes, the SAA7706H/N210,557 supports digital FM stereo decoding with integrated 19 kHz MPX filter, de-emphasis, and stereo detection. For AM, it supports digital AM CQUAM stereo decoding-but only in specific ROM code versions; standard operation includes AM mono processing with dynamic loudness and interference suppression. The device also provides separate AM-left and AM-right inputs to accommodate external AM stereo decoders when CQUAM is not enabled.
How does the SAA7706H/N210,557 handle RDS data reception and buffering?
The SAA7706H/N210,557 integrates a dedicated mono sigma-delta ADC (ADC3) and RDS clock/data recovery block that digitizes and parses RDS signals from the FM_RDS input. Decoded RDS data is stored in an internal buffer accessible via I²C-bus, enabling host microcontrollers to read RDS text (e.g., station name, traffic announcements) without continuous polling. The device also supports RDS update features including pause detection, mute during weak signal, and signal-quality freeze-ensuring consistent display updates even during multipath fading.
What are the key power supply requirements for the SAA7706H/N210,557?
The SAA7706H/N210,557 requires three independent supply domains: a 3.0–3.6 V digital core supply (VDDD3V1–VDDD3V4), a 3.0–3.6 V analog supply (VDDA1/VDDA2), and a dedicated 3.0–3.6 V crystal oscillator supply (VDD(OSC)). Each domain must be decoupled with low-ESR capacitors per the datasheet layout guidelines. Total typical power dissipation is 750 mW at full load (DSP1 at 50 MHz, DSP2 at 62.9 MHz), with analog supply current ≤60 mA and digital supply current ≤150 mA.
Is the SAA7706H/N210,557 pin-compatible with other devices in the SAA77xx family?
Yes, the SAA7706H/N210,557 is pin-compatible with the SAA7705H and SAA7708H in the same QFP80 package. This allows direct substitution in existing PCB layouts where functional requirements align-e.g., upgrading from SAA7705H to SAA7706H/N210,557 adds RDS and dual-zone audio without hardware changes, while moving to SAA7708H enables higher DSP2 clock speed and SPDIF transmit capability. Pin compatibility covers all signal, power, and ground connections defined in the SOT318-2 outline.
SAA7706H/N210,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 80-BQFP
- Packaging:
- Tray
- 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/N210,557 FAQ
1.How can I place an order for SAA7706H/N210,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for SAA7706H/N210,557 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 SAA7706H/N210,557 reliable?
The price and inventory of SAA7706H/N210,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SAA7706H/N210,557 is usually 5 days.
3.What payment methods are accepted for SAA7706H/N210,557?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SAA7706H/N210,557 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SAA7706H/N210,557?
SAA7706H/N210,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SAA7706H/N210,557 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 SAA7706H/N210,557?
For technical support, including SAA7706H/N210,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SAA7706H/N210,557 requirements.
6.How does Aetrix verify that SAA7706H/N210,557 is sourced from the original manufacturer or authorized distributors?
All SAA7706H/N210,557 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 SAA7706H/N210,557 meets industry standards.
7.What is the process for return or replacement of SAA7706H/N210,557?
All SAA7706H/N210,557 units undergo pre-shipment inspection (PSI). If there is an issue with SAA7706H/N210,557, 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 SAA7706H/N210,557 part is unused and in its original packaging.
Return procedure for SAA7706H/N210,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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