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Home > Products > RF and Wireless > RF Mixers

NXP Semiconductors SA639DH/01,118

Name: SA639DH/01,118
Brand: NXP Semiconductors
SKU: SA639DH/01,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA639DH/01,118

Manufacturer:: NXP Semiconductors

Category:: RF Mixers

Package:: 24-TSSOP (0.173", 4.40mm Width)

Datasheet:: SA639DH/01,118.pdf

Description:: IC MIXER 500MHZ UP CONV 24TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SA639DH/01,118 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 wideband FSK/ASK data receivers.

For engineers reviewing the SA639DH/01,118 datasheet, SA639DH/01,118 pinout, SA639DH/01,118 application, or SA639DH/01,118 equivalent, this page delivers verified circuit role (FM IF signal processor with integrated RSSI and data switch), package mapping (TSSOP24), key DC/AC specs (e.g., 9.2 dB mixer conversion gain, 1 MHz min data bandwidth, 0.8 µs RSSI rise time), and real-world selection guidance for portable wireless receiver design.

Technical Context

The SA639DH/01,118 implements a complete second-IF or single-conversion FM demodulation chain: Gilbert-cell mixer (NF = 11 dB, IP3i = −9.5 dBm) feeds two cascaded 330 Ω-terminated limiting IF amplifiers (total gain ≈ 92 dB), followed by a quadrature detector producing low-impedance DATA_OUT with ≥2.4 MHz bandwidth. Its oscillator supports crystal (≤150 MHz) or LC (≤1 GHz) configurations.

Core signal conditioning includes a post-detection Sallen-Key Bessel low-pass filter amplifier (gain = −0.2 dB, 3 dB BW = 12.8 MHz, slew rate = 2.4 V/µs) and an active data switch (DC input range 1.2–2.0 V, ±5 mV static offset, >14 V/µs slew rate) that sources/sinks 3 mA to drive external RC integration circuits for data comparator reference generation.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.7 V to 5.5 V - enables direct battery operation in portable 3 V systems without LDO overhead.
Supply Current	8.6 mA typical at 3 V - supports ultra-low-power DECT burst-mode operation with 140 µA standby current.
Mixer Performance	9.2 dB conversion gain, 11 dB noise figure at 110 MHz - delivers high sensitivity (2.24 µV for 10 dB S/N) in compact RF front-ends.
RSSI Dynamic Range	≥80 dB, temperature-compensated - provides stable received signal strength measurement across −40 °C to +85 °C ambient.
Data Output Bandwidth	≥2.4 MHz - supports high-rate FSK/ASK demodulation (e.g., DECT 576 kHz symbol rate with margin).
Power-Down Control	CMOS/TTL-compatible HIGH-active on Pin 8 - reduces current to <500 µA and outputs 1.6 V reference on data switch during sleep.
Post-Detection Filter	0 dB nominal gain, 12.8 MHz 3 dB BW, 2.4 V/µs slew rate - enables precise group-delay-optimized low-pass filtering before external comparators.

Pinout & Package

SA639DH/01,118 is housed in a plastic TSSOP24 package (SOT355-1), 4.4 mm body width, 0.65 mm lead pitch, JEDEC-compliant for surface-mount assembly in space-constrained portable radios.

Pin/Terminal	Circuit Role	Design Meaning
RF_IN (1)	RF input node	Single-ended 800 Ω input impedance; accepts up to 500 MHz signals for direct connection to antenna matching networks.
POWER_DOWN_CTRL (8)	Power-down enable	Active-HIGH TTL/CMOS input; asserts full chip shutdown with 1.6 V data switch reference and <500 µA ICC(stb).
DATA_OUT (9)	Demodulated data output	Low-impedance voltage source; delivers ≥260 mVpp into 10 kΩ/30 pF load with 2.4 MHz bandwidth for robust comparator interfacing.
RSSI_OUT (7)	RSSI analog output	Rail-to-rail op-amp output; provides 0.4–1.6 V linear-in-dB response over 80 dB RF input range (−90 to −10 dBm).
SWITCH_CTRL (12)	Data switch control	Logic input enabling active switching of POSTAMP_OUT to external RC integrator; closed for ~10 µs during sync-word detection.
POSTAMP_OUT (11)	Post-detection filter output	DC-biased at 1.7 V (±0.2 V); drives external data comparators with <500 Ω output impedance and Bessel-filtered group delay.

Key Features

Feature	Design Value
Wideband data output	≥2.4 MHz bandwidth ensures faithful demodulation of high-symbol-rate FSK/ASK signals like DECT's 576 kHz modulation.
Programmable data switch	Tracks 1.2–2.0 V DC inputs with ±5 mV offset and >14 V/µs slew rate, enabling accurate, low-drift reference generation for data comparators.
Temperature-compensated RSSI	±1.5 dB RSSI variation over −40 °C to +85 °C ensures reliable link budget estimation in varying environmental conditions.
Integrated post-detection filter amplifier	Configurable as Sallen-Key Bessel LPF (fc ≈ 800 kHz); maintains constant group delay for minimal inter-symbol distortion in digital receivers.
Low-voltage mixer architecture	Operates down to 2.7 V with 9.2 dB conversion gain and 11 dB NF - eliminates need for external LNA in battery-powered 3 V receivers.

Applications

DECT Cordless Telephony	FSK Data Receivers
Use Scenario: Digital European Cordless Telephone base station and handset RF front-end receiving 1880–1900 MHz carrier with 576 kHz FSK modulation. IC Role / Device Role / Timing Role: Full IF signal processor: mixer downconverts RF to 9.8 MHz IF, limiter/quad detector recovers baseband data, RSSI monitors channel quality, data switch generates comparator threshold. Use Value: Single-chip solution eliminates discrete IF filters, detectors, and RSSI amps - reduces BOM count, PCB area, and calibration complexity while meeting ETSI DECT spectral mask requirements.	Use Scenario: Industrial telemetry receiver decoding 433 MHz ASK/FSK sensor data packets with variable symbol rates up to 57.6 kbps. IC Role / Device Role / Timing Role: High-sensitivity IF demodulator: mixer accepts wideband RF input, limiting amplifiers suppress amplitude noise, quadrature detector extracts clean data, postamp filters harmonics before comparator. Use Value: 2.24 µV sensitivity and 80 dB RSSI range enable reliable reception at edge-of-range; programmable data switch adapts threshold dynamically to fading channels.
ASK Remote Control Receivers	Portable Wireless Audio Links
Use Scenario: Garage door opener or smart home remote receiver operating at 315/433 MHz with OOK/ASK modulation and burst transmission. IC Role / Device Role / Timing Role: Low-power IF processor: power-down mode cuts ICC to 140 µA between bursts; fast RSSI rise/fall times (0.8/2.0 µs) support rapid AGC and wake-up detection. Use Value: CMOS-compatible POWER_DOWN_CTRL allows microcontroller-driven sleep/wake cycles; internal 1.6 V reference maintains RC integrator charge during deep sleep - eliminating external bias components.	Use Scenario: Bluetooth headset companion receiver for analog audio streaming via proprietary 2.4 GHz FHSS or narrowband FM links. IC Role / Device Role / Timing Role: High-fidelity FM demodulator: quadrature detector preserves audio linearity; post-detection Bessel filter minimizes phase distortion; RSSI enables automatic volume leveling. Use Value: 60 dB S/N and <±1.5 dB RSSI drift ensure consistent audio quality across temperature; 330 Ω IF input/output impedances simplify ceramic filter interface without matching networks.

DECT Cordless Telephony

FSK Data Receivers

Use Scenario: Digital European Cordless Telephone base station and handset RF front-end receiving 1880–1900 MHz carrier with 576 kHz FSK modulation.

IC Role / Device Role / Timing Role: Full IF signal processor: mixer downconverts RF to 9.8 MHz IF, limiter/quad detector recovers baseband data, RSSI monitors channel quality, data switch generates comparator threshold.

Use Value: Single-chip solution eliminates discrete IF filters, detectors, and RSSI amps - reduces BOM count, PCB area, and calibration complexity while meeting ETSI DECT spectral mask requirements.

Use Scenario: Industrial telemetry receiver decoding 433 MHz ASK/FSK sensor data packets with variable symbol rates up to 57.6 kbps.

IC Role / Device Role / Timing Role: High-sensitivity IF demodulator: mixer accepts wideband RF input, limiting amplifiers suppress amplitude noise, quadrature detector extracts clean data, postamp filters harmonics before comparator.

Use Value: 2.24 µV sensitivity and 80 dB RSSI range enable reliable reception at edge-of-range; programmable data switch adapts threshold dynamically to fading channels.

ASK Remote Control Receivers

Portable Wireless Audio Links

Use Scenario: Garage door opener or smart home remote receiver operating at 315/433 MHz with OOK/ASK modulation and burst transmission.

IC Role / Device Role / Timing Role: Low-power IF processor: power-down mode cuts ICC to 140 µA between bursts; fast RSSI rise/fall times (0.8/2.0 µs) support rapid AGC and wake-up detection.

Use Value: CMOS-compatible POWER_DOWN_CTRL allows microcontroller-driven sleep/wake cycles; internal 1.6 V reference maintains RC integrator charge during deep sleep - eliminating external bias components.

Use Scenario: Bluetooth headset companion receiver for analog audio streaming via proprietary 2.4 GHz FHSS or narrowband FM links.

IC Role / Device Role / Timing Role: High-fidelity FM demodulator: quadrature detector preserves audio linearity; post-detection Bessel filter minimizes phase distortion; RSSI enables automatic volume leveling.

Use Value: 60 dB S/N and <±1.5 dB RSSI drift ensure consistent audio quality across temperature; 330 Ω IF input/output impedances simplify ceramic filter interface without matching networks.

Equivalent & Alternatives

The following parts are listed as comparable options for similar FM IF signal processing applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SA606DK/01,118	Lower integration: no post-detection filter amplifier or programmable data switch; RSSI range limited to 60 dB.	Suitable for basic FSK receivers where external filtering and fixed-threshold comparison suffice.	Select SA606DK/01,118 only if cost reduction outweighs loss of adaptive thresholding and integrated filtering.
NE605N,112	Legacy bipolar process; higher supply current (4.5 mA at 3 V vs. 8.6 mA), no power-down mode, no RSSI, no data switch.	Applicable to simple mixer-oscillator functions in non-battery-powered equipment with relaxed power and feature requirements.	Choose NE605N,112 only for legacy redesigns requiring pin-for-pin compatibility with older designs lacking RSSI/data switch needs.

Compared with SA606DK/01,118 and NE605N,112, the SA639DH/01,118 delivers uniquely integrated RSSI, data switch, and post-detection filtering - enabling single-chip DECT/FSK receivers with adaptive thresholding, low-power burst operation, and reduced external component count.

Availability

SA639DH/01,118 is available at Aetrix Electronics and suitable for DECT cordless telephony, industrial FSK telemetry, ASK remote control, and portable wireless audio links requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SA639DH/01,118 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/01,118 belongs to NXP's legacy RF receiver product line targeting low-power, high-integration FM/FSK/ASK demodulation for portable wireless communication - emphasizing single-chip IF processing, battery efficiency, and system-level simplification.

FAQ

What is the primary function of the SA639DH/01,118 in an RF receiver design?

The SA639DH/01,118 serves as a fully integrated FM intermediate frequency (IF) signal processor. It performs RF-to-IF mixing, IF amplification and limiting, quadrature FM demodulation, logarithmic RSSI generation, post-detection filtering, and programmable data switching - consolidating functions traditionally requiring multiple discrete ICs into one TSSOP24 device. This makes the SA639DH/01,118 ideal for compact, low-power receivers like DECT handsets.

Does the SA639DH/01,118 support crystal-based local oscillators?

Yes, the SA639DH/01,118 supports crystal oscillator configurations up to 150 MHz using its OSC_IN (Pin 4) and OSC_OUT (Pin 3) terminals. The datasheet specifies Butler oscillator topology for optimal performance in crystal mode. For higher frequencies, external LC tank oscillators injecting into the mixer can extend LO operation to 1 GHz - but crystal-based designs are explicitly validated and recommended for stability in portable applications.

How does the data switch in the SA639DH/01,118 improve FSK/ASK receiver performance?

The SA639DH/01,118 data switch (controlled by SWITCH_CTRL on Pin 12) actively routes POSTAMP_OUT to an external RC integrator to generate a dynamic data comparator reference voltage. With ±5 mV DC offset accuracy and >14 V/µs slew rate, it tracks signal envelope variations across receive bursts - enabling adaptive thresholding that maintains bit error rate stability under fading or interference. This eliminates manual threshold tuning and improves robustness in variable-channel environments.

What is the minimum required insertion loss between IF stages to ensure accurate RSSI operation in the SA639DH/01,118?

To achieve optimum linearity of the SA639DH/01,118's logarithmic RSSI, a 6 dBV insertion loss must be present between the first and second IF stages - specifically between IF_AMP_OUT (Pin 20) and the interstage network. If the ceramic or crystal IF filter does not provide this loss, a fixed or variable resistor must be added. Failure to meet this requirement degrades RSSI accuracy and compresses its effective dynamic range below the specified 80 dB.

Can the SA639DH/01,118 operate reliably at the lower end of its supply voltage range?

Yes, the SA639DH/01,118 is fully characterized and guaranteed to operate from 2.7 V to 5.5 V. At 2.7 V, it maintains 9.2 dB mixer conversion gain, 11 dB noise figure, and functional RSSI output - confirmed across −40 °C to +85 °C ambient. Its 8.6 mA typical supply current at 3 V and 140 µA standby current make the SA639DH/01,118 suitable for single-cell Li-ion or dual-cell alkaline battery systems without voltage regulation.

SA639DH/01,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: SA639

Package/Case:: 24-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

RF Type:: ASK, DECT, FSK

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/01,118 FAQ

1.How can I place an order for SA639DH/01,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA639DH/01,118 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/01,118 reliable?

The price and inventory of SA639DH/01,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA639DH/01,118 is usually 5 days.

3.What payment methods are accepted for SA639DH/01,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA639DH/01,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA639DH/01,118?

SA639DH/01,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA639DH/01,118 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/01,118?

For technical support, including SA639DH/01,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA639DH/01,118 requirements.

6.How does Aetrix verify that SA639DH/01,118 is sourced from the original manufacturer or authorized distributors?

All SA639DH/01,118 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/01,118 meets industry standards.

7.What is the process for return or replacement of SA639DH/01,118?

All SA639DH/01,118 units undergo pre-shipment inspection (PSI). If there is an issue with SA639DH/01,118, 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/01,118 part is unused and in its original packaging.

Return procedure for SA639DH/01,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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