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NXP Semiconductors SA639DH/01,112
- Part No.:
- SA639DH/01,112
- Manufacturer:
- NXP Semiconductors
- Category:
- RF Mixers
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SA639DH/01,112.pdf
- Description:
- IC MIXER 500MHZ UP CONV 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,971
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Product details
Overview
SA639DH/01,112 from NXP Semiconductors is a low-voltage 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. It operates from 2.7 V to 5.5 V with 8.6 mA typical supply current at 3 V and supports RF input up to 500 MHz - designed for DECT and FSK/ASK data receivers.
For engineers reviewing the SA639DH/01,112 datasheet, SA639DH/01,112 pinout, SA639DH/01,112 application, or SA639DH/01,112 equivalent, this page delivers verified circuit role, TSSOP24 pin mapping, real-world performance metrics (e.g., 9.2 dB mixer conversion gain, 11 dB noise figure at 110 MHz), and validated alternatives for portable FM demodulation systems requiring low-power, high-bandwidth signal processing.
Technical Context
The SA639DH/01,112 implements a single-conversion FM IF architecture with Gilbert-cell mixer (NF = 11 dB, IP3i = −9.5 dBm), 90 dB total IF/limiter gain, and 25 MHz small-signal limiter bandwidth optimized for 9.8 MHz IF. Its oscillator supports crystal (≤150 MHz) or LC tank (≤1 GHz) configurations, and the quadrature detector drives a low-impedance DATA_OUT with ≥2.4 MHz bandwidth.
Internal blocks include a rail-to-rail RSSI op amp with feedback access (pin 6), a Bessel-characteristic post-detection filter amplifier (gain = −0.2 dB, 3 dB BW = 12.8 MHz), and a 3-state programmable data switch with <100 nA leakage and >14 V/μs slew rate - all controllable via CMOS/TTL-compatible POWER_DOWN_CTRL (pin 8) and SWITCH_CTRL (pin 12).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V - enables direct battery operation in portable DECT handsets without LDO overhead. |
| Mixer Conversion Gain | 9.2 dB at 110 MHz - provides sufficient signal level to drive 330 Ω ceramic filters without external amplification. |
| RSSI Dynamic Range | >80 dB with temperature compensation - meets DECT cordless telephone sensitivity requirements across −40 °C to +85 °C. |
| Data Output Bandwidth | ≥2.4 MHz - supports demodulation of 576 kHz FSK signals with adequate margin for group delay control. |
| Power-Down Current | 140 μA typical - reduces standby power in DECT paging mode while retaining fast wake-up (tOFF = 5 μs). |
| Limiter Input Impedance | 330 Ω - matches standard ceramic IF filters, eliminating interstage matching networks. |
| Post-Detection Amplifier Slew Rate | 2.4 V/μs - ensures faithful reproduction of fast data transitions without distortion in burst-mode reception. |
Pinout & Package
SA639DH/01,112 is housed in a 24-lead TSSOP package (SOT355-1), 4.4 mm body width, lead pitch 0.65 mm, suitable for high-density RF PCB layouts with thermal impedance Zth(j-a) = 117 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN (1) | RF input | Single-ended 800 Ω input for direct connection to antenna matching network or RF filter. |
| POWER_DOWN_CTRL (8) | Power-down enable | CMOS/TTL-compatible active-HIGH control; asserts low-current state (140 μA) and sets RSSI/data outputs to defined bias points. |
| DATA_OUT (9) | Demodulated data output | Low-impedance voltage output supporting ≥2.4 MHz bandwidth - directly interfaces with external data comparators. |
| RSSI_FEEDBACK (6) | RSSI op amp negative input | Allows external resistor network for gain adjustment, filtering, or second-order temperature compensation of RSSI output. |
| SWITCH_CTRL (12) | Data switch control | Active-LOW enables internal switch to route DATA_OUT to external RC integrator for reference voltage generation. |
| POSTAMP_IN (10) / POSTAMP_OUT (11) | Post-detection filter amplifier I/O | Configurable Sallen-Key low-pass stage with 800 kHz Bessel cutoff - optimizes group delay for digital data recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Wideband data output | ≥2.4 MHz bandwidth enables reliable demodulation of DECT's 576 kHz FSK bursts with minimal intersymbol interference. |
| Programmable data switch | 3 mA sink/source capability and <1 μs activation time support fast settling of external RC integrators during DECT slot synchronization. |
| Temperature-compensated RSSI | ±1.5 dB RSSI variation over −40 °C to +85 °C ensures stable signal strength reporting in varying environmental conditions. |
| Integrated post-detection filter amplifier | 0 dB nominal gain with 12.8 MHz bandwidth and 2.4 V/μs slew rate preserves data integrity while enabling flexible low-pass filtering. |
| Low-voltage operation | 2.7 V minimum supply allows use with single Li-ion or dual NiMH cells without voltage regulation overhead. |
Applications
| DECT Handset Receiver | FSK Data Link Module |
|---|---|
|
Use Scenario: Digital European Cordless Telephone handset receiving 1880–1900 MHz carrier with 576 kHz FSK modulation in burst mode. IC Role / Device Role / Timing Role: Single-chip FM IF processor performing RF-to-baseband conversion, limiting, quadrature detection, and RSSI generation. Use Value: Integrated data switch and post-detection amplifier eliminate discrete components needed for sync-word-triggered reference generation and burst-mode filtering. |
Use Scenario: Industrial telemetry node receiving narrowband FSK signals in noisy 433 MHz ISM band. IC Role / Device Role / Timing Role: High-sensitivity IF subsystem delivering clean baseband data and calibrated RSSI for adaptive receiver gain control. Use Value: 80 dB RSSI dynamic range and 11 dB mixer noise figure enable robust link budget management in fading environments. |
| ASK Remote Control Receiver | Portable FM Radio IF Stage |
|
Use Scenario: Battery-powered garage door opener receiver decoding ASK-modulated 315 MHz or 433 MHz commands. IC Role / Device Role / Timing Role: Low-power IF front-end providing amplitude-insensitive FM demodulation path and fast RSSI for signal presence detection. Use Value: Power-down mode (140 μA) extends battery life between infrequent command receptions while maintaining sub-10 μs wake-up latency. |
Use Scenario: Compact portable FM radio requiring high-fidelity audio IF processing with minimal external components. IC Role / Device Role / Timing Role: Complete IF chain including limiting amplifiers, quadrature detector, and post-detection filtering for analog audio extraction. Use Value: 90 dB IF/limiter gain and 25 MHz limiter bandwidth support wide IF filter selection and high-SNR audio output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FM IF processing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SA606DK/01,112 | Lower integration: no post-detection amplifier or programmable data switch; RSSI range limited to 60 dB. | Suitable for cost-sensitive AM/FM IF applications where external filtering and reference generation are acceptable. | Select SA606DK/01,112 only when full SA639DH/01,112 feature set is unnecessary and BOM count reduction is secondary to unit cost. |
| MAX2102ETL+ | Higher supply voltage (4.75–5.25 V), integrated VCO, but lacks RSSI temperature compensation and data switch functionality. | Better suited for fixed-infrastructure receivers with stable power and no burst-mode timing constraints. | Choose MAX2102ETL+ only for 5 V systems requiring on-chip VCO and where RSSI accuracy over temperature is not critical. |
Compared with SA606DK/01,112 and MAX2102ETL+, the SA639DH/01,112 uniquely combines ultra-low-voltage operation (2.7 V), 80 dB temperature-stable RSSI, and a dedicated data switch - making it the only option qualified for DECT-compliant portable receivers requiring synchronized reference generation and battery longevity.
Availability
SA639DH/01,112 is available at Aetrix Electronics and suitable for DECT handsets, FSK telemetry modules, and ASK remote control receivers requiring stable component supply, guaranteed long-term availability, and traceable sourcing for industrial and consumer OEM programs.
Supply support for SA639DH/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 is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and consumer applications, with deep expertise in RF and mixed-signal IC design.
The SA639DH/01,112 belongs to NXP's legacy FM IF processor family, engineered specifically for high-performance, low-power portable communication devices such as DECT telephones and digital wireless data links.
FAQ
What is the operating voltage range for the SA639DH/01,112?
The SA639DH/01,112 operates from 2.7 V to 5.5 V, enabling direct integration into single-cell lithium-ion or dual-cell NiMH battery systems without external regulation. At 3 V, it draws 8.6 mA typical supply current, and its internal voltage regulator maintains stable biasing across this range. Absolute maximum supply voltage is +6 V per the datasheet limiting values table.
How does the SA639DH/01,112 implement RSSI temperature compensation?
The SA639DH/01,112 uses an on-chip bandgap-referenced logarithmic amplifier with built-in temperature compensation circuitry, achieving ±1.5 dB RSSI variation over −40 °C to +85 °C. The RSSI output voltage ranges from 0.4 V at −90 dBm to 1.6 V at −10 dBm RF input, and the RSSI_FEEDBACK pin (6) allows external resistor networks for additional second-order correction if required.
Can the SA639DH/01,112 be used with crystal or LC oscillators?
Yes - the SA639DH/01,112 supports both crystal and LC-based local oscillators. Crystal configurations work up to 150 MHz using Butler oscillator topology, while LC tank oscillators operate up to 1 GHz. Pins OSC_IN (4) and OSC_OUT (3) provide direct access to the oscillator core, and the datasheet confirms Hartley/Colpitts topologies are valid for crystal use below 100 MHz.
What is the function of the data switch in the SA639DH/01,112?
The SA639DH/01,112 data switch (controlled by SWITCH_CTRL pin 12) routes DATA_OUT to an external RC integrator to generate a precise DC reference voltage for data comparators. It closes for ~10 μs before and during sync-word reception, provides 3 mA drive capability, and maintains <±5 mV DC offset tracking across 1.2–2.0 V input range - critical for DECT burst-mode timing accuracy.
Does the SA639DH/01,112 require external IF filtering?
No - the SA639DH/01,112 is designed for direct interface with standard 330 Ω impedance IF filters (ceramic or crystal). Its IF amplifier and limiter inputs/outputs are internally matched to 330 Ω, eliminating need for external matching networks. However, a 6 dBV interstage loss between IF_AMP_OUT (pin 20) and limiter input is required for optimal RSSI linearity, which may necessitate a small series resistor if the filter insertion loss is insufficient.
SA639DH/01,112 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/01,112 FAQ
1.How can I place an order for SA639DH/01,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA639DH/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 SA639DH/01,112 reliable?
The price and inventory of SA639DH/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 SA639DH/01,112 is usually 5 days.
3.What payment methods are accepted for SA639DH/01,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA639DH/01,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA639DH/01,112?
SA639DH/01,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA639DH/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 SA639DH/01,112?
For technical support, including SA639DH/01,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA639DH/01,112 requirements.
6.How does Aetrix verify that SA639DH/01,112 is sourced from the original manufacturer or authorized distributors?
All SA639DH/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 SA639DH/01,112 meets industry standards.
7.What is the process for return or replacement of SA639DH/01,112?
All SA639DH/01,112 units undergo pre-shipment inspection (PSI). If there is an issue with SA639DH/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 SA639DH/01,112 part is unused and in its original packaging.
Return procedure for SA639DH/01,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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