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NXP Semiconductors SA639DH,512
- Part No.:
- SA639DH,512
- Manufacturer:
- NXP Semiconductors
- Category:
- RF Mixers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SA639DH,512.pdf
- Description:
- IC MIXER 500MHZ UP CONV 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
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Product details
Overview
SA639DH,512 from NXP Semiconductors is a low-voltage (2.7–5.5 V) monolithic FM IF system integrating mixer/oscillator, dual wideband limiting IF amplifiers, quadrature detector, temperature-compensated logarithmic RSSI (80+ dB dynamic range), fast RSSI op amp, post-detection filter amplifier, and programmable data switch - all in a 24-lead TSSOP package. It delivers 9.2 dB mixer conversion gain, 92 dB total IF/limiter power gain, and 1 MHz minimum data bandwidth for DECT and FSK/ASK receivers.
For engineers reviewing the SA639DH,512 datasheet, SA639DH,512 pinout, SA639DH,512 application, or SA639DH,512 equivalent, this device supports high-bandwidth portable communication designs requiring low-power FM demodulation, precise signal strength measurement, and integrated data conditioning with power-down control and external reference generation.
Technical Context
The SA639DH,512 implements a single-conversion or second-IF architecture with RF input up to 500 MHz and L/C oscillator support to 1 GHz. Its Gilbert-cell mixer (NF = 11 dB at 110 MHz) feeds two cascaded 330 Ω-terminated IF stages optimized for 9.8 MHz operation, followed by a quadrature detector driving a low-impedance DATA_OUT with ≥2.4 MHz bandwidth.
Internal signal paths include a dedicated post-detection filter amplifier (Bessel-type low-pass, ~800 kHz fc, 0 dB gain, <500 Ω output impedance) and a precision data switch (1.2–2.0 V DC input range, ±5 mV offset, >14 V/μs slew rate) that sources/sinks 3 mA to maintain RC integration voltage during DECT burst timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 5.5 V - enables direct battery operation in portable devices without external regulation. |
| Supply Current | 8.6 mA typical at 3 V - ensures low power consumption for extended battery life in cordless handsets. |
| Mixer NF / Gain | 11 dB noise figure, 9.2 dB conversion power gain at 110 MHz - provides high sensitivity (2.24 μV for 10 dB S/N). |
| RSSI Dynamic Range | Exceeds 80 dB with temperature compensation - supports accurate link budgeting across industrial temperature range (−40 °C to +85 °C). |
| Data Output Bandwidth | ≥2.4 MHz - meets DECT 576 kHz symbol rate with margin for harmonic content and filtering. |
| Power-Down Mode | CMOS/TTL-compatible HIGH on pin 8 reduces supply current to 140 μA - enables rapid wake-up (<10 μs RSSI valid time). |
| Limiter Small-Signal BW | 25 MHz - maintains fidelity of wideband FM signals before quadrature detection. |
Pinout & Package
SA639DH,512 is housed in a plastic thin shrink small outline package (TSSOP24, SOT355-1) with 24 leads and 4.4 mm body width, optimized for high-density RF PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN (1) | RF input port | Single-ended 800 Ω input for direct connection to antenna matching network or filter. |
| POWER_DOWN_CTRL (8) | Active-HIGH shutdown control | Drives entire IC into standby (140 μA); TTL/CMOS compatible with high input impedance. |
| DATA_OUT (9) | Demodulated baseband output | Low-impedance voltage source supporting ≥2.4 MHz bandwidth into 10 kΩ load. |
| RSSI_FEEDBACK (6) | Negative feedback node for RSSI op amp | Enables external gain adjustment, filtering, or second-order temperature compensation. |
| SWITCH_CTRL (12) | Data switch enable | Controls active switching between internal reference and external integration circuit (closed for sync word capture). |
| POSTAMP_IN (10) / POSTAMP_OUT (11) | Post-detection filter amplifier I/O | Configurable Sallen-Key Bessel low-pass (fc ≈ 800 kHz); DC bias fixed at 1.6 V for comparator compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RSSI op amp | Rail-to-rail output with access to feedback pin (pin 6) for custom gain/filtering without external components. |
| Programmable data switch | Tracks 1.2–2.0 V DC inputs with ±5 mV offset; sinks/sources 3 mA to minimize RC settling time in DECT paging mode. |
| Wideband IF chain | 92 dB total gain across IF amplifier and limiter stages, optimized for 330 Ω ceramic filters - eliminates interstage matching networks. |
| Fast RSSI response | Rise/fall times ≤0.8 μs / ≤2.0 μs - enables real-time AGC and signal monitoring in burst-mode systems. |
| Low-voltage operation | Functional down to 2.7 V with full specification compliance - supports single-cell Li-ion or dual-cell alkaline power rails. |
Applications
| DECT Cordless Handset Receiver | FSK Data Link Receiver |
|---|---|
|
Use Scenario: Digital European Cordless Telephone (DECT) handset receiving 1.88–1.90 GHz carrier via downconversion to 9.8 MHz IF. IC Role / Device Role / Timing Role: Full IF signal processing block: mixer, limiting amplification, quadrature demodulation, RSSI-based AGC, and data conditioning with burst-synchronized reference generation. Use Value: Eliminates discrete IF chain components; enables compact, low-power handset design with guaranteed 576 kHz data throughput and <10 μs RSSI wake-up. |
Use Scenario: Industrial telemetry receiver decoding FSK-modulated sensor data at 100–500 kHz symbol rates. IC Role / Device Role / Timing Role: High-sensitivity FM demodulator with programmable data switch for adaptive threshold setting and post-detection filtering. Use Value: Delivers robust demodulation under fading conditions via 80+ dB RSSI range and supports variable data rates using external RC time constant tuning. |
| ASK Remote Control Receiver | Portable FM Radio IF Subsystem |
|
Use Scenario: Battery-powered garage door opener or smart home remote receiver operating at 315/433 MHz ISM bands. IC Role / Device Role / Timing Role: Low-power IF processor providing ASK envelope detection via DATA_OUT path and RSSI-based signal validation. Use Value: Reduces bill-of-materials with integrated limiter/detector/filter; achieves −100 dBm IF input sensitivity and 140 μA standby current for multi-year battery life. |
Use Scenario: Compact portable FM radio requiring high-fidelity audio recovery from 10.7 MHz IF with minimal external components. IC Role / Device Role / Timing Role: Complete IF subsystem including quadrature detector, post-detection amplifier, and DC-biased output for direct connection to audio ADC or op-amp. Use Value: Provides 0 dB gain, Bessel-filtered output with 1.6 V DC bias - simplifies analog front-end design and improves group delay linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FM IF demodulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SA606DK,518 | Lower integration: no post-detection amplifier or programmable data switch; RSSI range limited to 60 dB. | Suitable for cost-sensitive AM/FM receivers where external filtering and reference generation are acceptable. | Select SA639DH,512 when Bessel-filtered baseband output, 80+ dB RSSI, or DECT-timed data switching are required. |
| NE612D,112 | Legacy bipolar mixer-only IC; lacks IF amplification, limiter, detector, RSSI, and power-down functionality. | Requires full external IF chain and separate RSSI circuitry - increases board area and component count. | Choose SA639DH,512 for complete single-chip IF solution; NE612D,112 only fits retrofit or legacy analog designs. |
Compared with SA606DK,518 and NE612D,112, the SA639DH,512 delivers higher integration, wider RSSI dynamic range, and built-in data conditioning - reducing system-level component count by ≥7 parts while enabling DECT-compliant burst-mode operation.
Availability
SA639DH,512 is available at Aetrix Electronics and suitable for DECT handsets, FSK telemetry links, ASK remote controls, and portable FM radios requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.
Supply support for SA639DH,512 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 deep expertise in RF signal processing and mixed-signal integration.
The SA639DH,512 belongs to NXP's legacy FM IF system product line, designed specifically for high-performance, low-power portable communication devices requiring integrated demodulation, RSSI, and data conditioning in minimal footprint.
FAQ
What is the minimum supply voltage required for full functionality of the SA639DH,512?
The SA639DH,512 operates fully specified from 2.7 V to 5.5 V. At 2.7 V, it maintains 9.2 dB mixer conversion gain, 80+ dB RSSI dynamic range, and 2.4 MHz data output bandwidth per the datasheet. Below 2.7 V, performance degrades unpredictably and is not guaranteed - SA639DH,512 must be powered within this range for compliant operation.
How does the SA639DH,512 implement RSSI temperature compensation?
The SA639DH,512 integrates on-die temperature compensation circuitry within its logarithmic RSSI core, ensuring ≤±1.5 dB variation across −40 °C to +85 °C. This is achieved via bandgap-referenced biasing and matched transistor pairs - no external components are needed to stabilize SA639DH,512 RSSI output over temperature.
Can the SA639DH,512 be used with crystal oscillators above 150 MHz?
No - the SA639DH,512's internal crystal oscillator circuit is rated for up to 150 MHz. For frequencies beyond that, an external L/C tank oscillator (supporting up to 1 GHz) must be injected at OSC_IN (pin 4), as confirmed in the functional description section of the datasheet. Using a >150 MHz crystal directly violates SA639DH,512 specifications.
What is the purpose of the dual LIMITER_DECOUPL pins (16 and 17) on the SA639DH,512?
Pins 16 and 17 are separate decoupling terminals for the limiter stage's two internal amplifier sections. Each requires its own 100 nF ceramic capacitor to ground to suppress high-frequency oscillation and ensure stable limiting action across 25 MHz bandwidth. Omitting either capacitor risks instability - both are mandatory for SA639DH,512 functional integrity.
Does the SA639DH,512 support direct connection to a 330 Ω ceramic IF filter?
Yes - the SA639DH,512's IF amplifier input (pin 22) and limiter input (pin 18) are both internally terminated to 330 Ω, and the mixer output (pin 24) presents a 330 Ω load. This allows direct interface with standard 330 Ω impedance-matched ceramic filters without external matching networks - a key design feature confirmed in the functional description.
SA639DH,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- SA639
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- RF Type:
- Cellular, ASK, DECT, FSK, UHF, VHF
- Frequency:
- 500MHz
- Number of Mixers:
- 2
- Gain:
- 9.2dB
- Noise Figure:
- 11dB
- Secondary Attributes:
- Up Converter
- Current - Supply:
- 10mA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SA639DH,512 FAQ
1.How can I place an order for SA639DH,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA639DH,512 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 SA639DH,512 reliable?
The price and inventory of SA639DH,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA639DH,512 is usually 5 days.
3.What payment methods are accepted for SA639DH,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA639DH,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA639DH,512?
SA639DH,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA639DH,512 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 SA639DH,512?
For technical support, including SA639DH,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA639DH,512 requirements.
6.How does Aetrix verify that SA639DH,512 is sourced from the original manufacturer or authorized distributors?
All SA639DH,512 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 SA639DH,512 meets industry standards.
7.What is the process for return or replacement of SA639DH,512?
All SA639DH,512 units undergo pre-shipment inspection (PSI). If there is an issue with SA639DH,512, 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 SA639DH,512 part is unused and in its original packaging.
Return procedure for SA639DH,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA639DH,512 Tags
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ADEX-10+
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ADE-2+
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ADE-1+
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LT5560EDD#PBF
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LTC5562IUC#TRPBF
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MAX2681EUT+T
Analog Devices Inc./Maxim Integrated
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ADE-1ASK+
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ADE-1L+
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ADL5350ACPZ-R7
Analog Devices Inc.
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