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NXP Semiconductors SA608DK/01,112
- Part No.:
- SA608DK/01,112
- Manufacturer:
- NXP Semiconductors
- Category:
- RF Mixers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SA608DK/01,112.pdf
- Description:
- IC MIXER 150MHZ UP CONVRT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,267
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Product details
Overview
SA608DK/01,112 from NXP Semiconductors (formerly Philips) is a monolithic low-voltage FM intermediate frequency (IF) system integrating mixer/oscillator, dual limiting IF amplifiers, quadrature detector, temperature-compensated logarithmic RSSI, voltage regulator, and buffered audio/RSSI op amps. It operates down to 2.7V, delivers 17dB mixer conversion gain at 45MHz, achieves 90dB RSSI dynamic range, and supports crystal oscillator frequencies up to 150MHz. It is used in portable cellular radios and narrowband FM receivers requiring high sensitivity (0.31µV for 12dB SINAD) and rail-to-rail op amp outputs.
For engineers reviewing the SA608DK/01,112 datasheet, SA608DK/01,112 pinout, SA608DK/01,112 application, or SA608DK/01,112 equivalent, this page provides verified technical context, exact pin functions, real-world IF system design meaning of specifications, and two confirmed alternative parts for portable FM receiver signal chains where low supply voltage, integrated RSSI, and buffered frequency check output are required.
Technical Context
The SA608DK/01,112 implements a complete second-IF processing chain: a Gilbert-cell mixer with on-chip oscillator feeds two cascaded limiting IF amplifiers (44dB + 58dB gain), followed by a quadrature detector with internal 90° phase-shift network. Its RSSI circuit uses temperature-compensated logarithmic compression across –118dBm to –23dBm IF input levels, delivering 0.3–2.5V output with ±1.5dB accuracy.
It features three independent buffered outputs: audio (rail-to-rail op amp), RSSI (unity-gain op amp with accessible feedback pin), and frequency check (180° out-of-phase with limiter output, 130mVRMS into 5kΩ). The mixer input impedance is 8kΩ single-ended; IF and limiter inputs are 1.5kΩ and 1.3kΩ respectively - enabling direct connection to 455kHz ceramic filters without external matching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Mixer conversion gain | 17 dB typical at 45MHz - enables high-sensitivity front-end with minimal external gain stages |
| RSSI dynamic range | 90 dB - supports wide RF signal level variation in portable receivers without AGC loop redesign |
| Supply voltage range | 2.7 V to 7.0 V - allows direct operation from single Li-ion or dual alkaline cells |
| IF amplifier + limiter gain | 102 dB total - sufficient for weak-signal detection after ceramic filter insertion loss |
| Noise figure | 6.2 dB at 45MHz - ensures high SINAD performance in battery-powered FM demodulation |
| Quadrature detector bandwidth | 2 MHz small-signal limiter BW - accommodates 8kHz FM deviation with low distortion |
| DC current drain | 3.5 mA typical at 3V - enables >100-hour operation on 350mAh battery |
Pinout & Package
SA608DK/01,112 is supplied in a 20-pin plastic shrink small outline package (SSOP), surface-mount compatible with 0.65mm lead pitch and JEDEC MO-153 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | Decoupling terminals | Dedicated VCC bypass points for mixer, oscillator, IF amp, limiter, quad detector, and audio op amp - minimizes crosstalk in multi-stage IF chain |
| 7 | RF IN+ | Non-inverting mixer input - differential pair base for high-linearity RF signal injection |
| 8 | AUDIO | Buffered quadrature detector output - rail-to-rail op amp drives de-emphasis filter directly |
| 9 | FREQ CHECK / LIM OUT (–) | Inverted limiter output - 180° out-of-phase with Pin 11, used for AFC or FSK demodulation |
| 10 | QUADRATURE | AC-coupled IF port to quadrature network - establishes precise 90° phase shift for FM demodulation |
| 11 | LIMITER OUT (+) | Non-inverted limiter output - 130mVRMS into 5kΩ, paired with Pin 9 for differential frequency comparison |
| 12, 15 | VCC, GND | Primary power and ground - separate pins reduce supply noise coupling between analog blocks |
| 13, 14 | LIMITER IN, IF AMP IN | IF signal path inputs - 1.3kΩ and 1.5kΩ impedances match standard 455kHz ceramic filters |
| 16, 17 | IF AMP OUT, MIXER OUT | Interstage outputs - 1.5kΩ mixer output impedance permits direct ceramic filter connection |
| 18, 19, 20 | OSCIN, OSC–, RF IN– | Oscillator and RF differential inputs - support Hartley/Colpitts/Butler configurations up to 150MHz |
| RSSI, RSSI FEEDBACK | RSSI output and op amp feedback | Logarithmic RSSI voltage (0.3–2.5V) with user-accessible feedback node for calibration or gain adjustment |
Key Features
| Feature | Design Value |
|---|---|
| Integrated voltage regulator | Stabilizes internal bias rails across 2.7–7V supply - eliminates need for external LDO in portable designs |
| Buffered frequency check output | Enables AFC loop implementation using comparator + varactor without additional amplification stage |
| Rail-to-rail op amps | Maximizes dynamic range at audio and RSSI outputs - avoids clipping with 3V supply and ceramic filter loading |
| Temperature-compensated RSSI | Maintains ±1.5dB accuracy over –40°C to +85°C - critical for reliable signal strength reporting in outdoor devices |
| Low external component count | Supports crystal/ceramic/LC filters directly - reduces BOM cost and PCB area in compact handheld radios |
Applications
| Portable Cellular Radio FM IF | Cordless Phone Receiver |
|---|---|
Use Scenario: Battery-powered handheld transceiver receiving 45MHz IF signals with 8kHz FM deviation in NAMPS/NTACS bands. IC Role / Device Role / Timing Role: Full IF subsystem performing mixing, limiting, quadrature detection, and RSSI generation - replaces discrete IF strip plus log amp. Use Value: Achieves 0.31µV sensitivity and 12dB SINAD while consuming only 3.5mA at 3V, extending talk time without compromising audio fidelity. |
Use Scenario: DECT 1.8GHz or 900MHz cordless phone base station demodulating FM IF at 455kHz. IC Role / Device Role / Timing Role: Single-chip IF processor handling signal conditioning, limiting, FM demodulation, and received signal strength monitoring. Use Value: Eliminates 12+ discrete components (limiters, op amps, detector diodes) and reduces layout sensitivity via integrated decoupling pins. |
| RF Level Meter | Spectrum Analyzer Front-End |
Use Scenario: Handheld field strength meter measuring RF signal amplitude across VHF/UHF bands using crystal-controlled local oscillator. IC Role / Device Role / Timing Role: Logarithmic RSSI generator with 90dB dynamic range and ±1.5dB accuracy - core measurement engine. Use Value: Delivers calibrated dBm readings directly from IF stage without external ADC or correction tables due to temperature compensation. |
Use Scenario: Low-cost benchtop spectrum analyzer preselector and IF processing module operating at 455kHz center frequency. IC Role / Device Role / Timing Role: High-linearity IF amplifier chain (102dB gain) with 2MHz bandwidth feeding downstream envelope detector or digitizer. Use Value: Enables resolution of closely spaced tones (e.g., 10kHz apart) while maintaining 45dB AM rejection for clean spectral display. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FM IF system applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SA607D/01,112 | Lower integration: no RSSI, no audio op amp, no frequency check output; 14-pin SO package | Suitable only for basic mixer-IF amp functions - requires external log amp and buffer for RSSI/audio | Select when RSSI and buffered outputs are unnecessary and board space is constrained |
| NE605N | Same RF mixer/oscillator core but lacks IF limiters, quadrature detector, RSSI, and op amps; DIP-16 package | Requires full external IF strip (2 limiters, detector, op amps) - higher BOM and layout complexity | Select only for legacy drop-in replacement where existing design already implements missing functions externally |
Compared with SA608DK/01,112, SA607D/01,112 reduces integration to save cost and size but forfeits RSSI and audio buffering; NE605N provides only the front-end mixer-oscillator, demanding full external IF processing - making SA608DK/01,112 the sole choice for compact, self-contained FM IF systems with calibrated signal strength reporting.
Availability
SA608DK/01,112 is available at Aetrix Electronics and suitable for portable cellular radios, cordless phone receivers, and RF instrumentation requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.
Supply support for SA608DK/01,112 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, headquartered in Eindhoven, Netherlands, develops high-performance analog and RF ICs for wireless communication, automotive, and industrial markets.
The SA608DK/01,112 belongs to NXP's legacy RF Communications product line, designed specifically for portable FM receiver architectures requiring low-voltage operation, integrated IF signal processing, and calibrated RSSI functionality.
FAQ
What is the minimum supply voltage for reliable operation of the SA608DK/01,112?
The SA608DK/01,112 operates reliably down to 2.7V DC, as confirmed in its Absolute Maximum Ratings and DC Electrical Characteristics tables. At this voltage, it maintains 3.5mA typical current drain and full functionality including mixer conversion gain, RSSI accuracy, and limiter saturation - making it suitable for single-cell lithium or dual-cell alkaline battery systems where voltage sag occurs under load.
Does the SA608DK/01,112 support crystal oscillator configurations above 100MHz?
Yes, the SA608DK/01,112 supports crystal oscillator frequencies up to 150MHz using a Butler oscillator configuration, as explicitly stated in the Circuit Description section. Hartley or Colpitts topologies are recommended up to 100MHz; for higher frequencies, the Butler configuration is required to ensure stable oscillation and adequate drive capability into the mixer core.
How is the RSSI output calibrated across temperature for the SA608DK/01,112?
The SA608DK/01,112 incorporates temperature-compensated logarithmic compression circuitry that maintains RSSI output accuracy within ±1.5dB over the full –40°C to +85°C operating range. This is verified by Figure 14 in the datasheet, which shows overlapping RSSI vs RF level curves at –40°C, +27°C, and +85°C - confirming minimal thermal drift without external calibration.
Can the SA608DK/01,112 be used in a single-conversion VHF receiver architecture?
Yes, the SA608DK/01,112 is explicitly listed in the Applications section for "Single conversion VHF receivers." Its mixer input supports signals up to 150MHz, and its IF section is optimized for 455kHz - enabling direct downconversion from VHF bands (e.g., 150MHz input → 455kHz IF) when paired with an appropriate LO source, as demonstrated in the test circuits on pages 6–7 of the datasheet.
What is the purpose of the FREQ CHECK pin (Pin 9) on the SA608DK/01,112?
The FREQ CHECK pin (Pin 9) provides a buffered, inverted output of the limiter stage - 180° out-of-phase with Pin 11 (LIM OUT (+)). This differential pair enables zero-crossing detection in Automatic Frequency Control (AFC) loops or FSK demodulation by feeding both signals into a comparator, eliminating the need for external phase inversion or amplification circuitry.
SA608DK/01,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- SA608
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- RF Type:
- Cellular, ASK, FSK, NAMPS, NTACS, VHF
- Frequency:
- 150MHz
- Number of Mixers:
- 2
- Gain:
- 17dB
- Noise Figure:
- 6.2dB
- Secondary Attributes:
- Up Converter
- Current - Supply:
- 4.2mA
- Voltage - Supply:
- 2.7V ~ 7V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SA608DK/01,112 FAQ
1.How can I place an order for SA608DK/01,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA608DK/01,112 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 SA608DK/01,112 reliable?
The price and inventory of SA608DK/01,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA608DK/01,112 is usually 5 days.
3.What payment methods are accepted for SA608DK/01,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA608DK/01,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA608DK/01,112?
SA608DK/01,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA608DK/01,112 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 SA608DK/01,112?
For technical support, including SA608DK/01,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA608DK/01,112 requirements.
6.How does Aetrix verify that SA608DK/01,112 is sourced from the original manufacturer or authorized distributors?
All SA608DK/01,112 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 SA608DK/01,112 meets industry standards.
7.What is the process for return or replacement of SA608DK/01,112?
All SA608DK/01,112 units undergo pre-shipment inspection (PSI). If there is an issue with SA608DK/01,112, 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 SA608DK/01,112 part is unused and in its original packaging.
Return procedure for SA608DK/01,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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