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Home > Products > RF and Wireless > RF Mixers

NXP Semiconductors SA636DK/01,112

Name: SA636DK/01,112
Brand: NXP Semiconductors
SKU: SA636DK/01,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA636DK/01,112

Manufacturer:: NXP Semiconductors

Category:: RF Mixers

Package:: 20-LSSOP (0.173", 4.40mm Width)

Datasheet:: SA636DK/01,112.pdf

Description:: IC MIXER 500MHZ UP CONVRT 20SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SA636DK/01,112 from NXP Semiconductors is a low-voltage (2.7–5.5 V) monolithic FM IF system integrating mixer/oscillator, dual limiting IF amplifiers, quadrature detector, temperature-compensated logarithmic RSSI (90 dB dynamic range), wideband data output (≥600 kHz), and power-down control. It delivers 11 dB mixer conversion gain at 240 MHz, 92 dB total IF/limiter gain, and supports DECT, FSK/ASK data receivers, and portable VHF/UHF communications.

For engineers reviewing the SA636DK/01,112 datasheet, SA636DK/01,112 pinout, SA636DK/01,112 application, or SA636DK/01,112 equivalent, key selection criteria include RSSI voltage calibration at −118 dBm (0.2–0.5 V), SSOP20 package compatibility, 6.5 mA typical supply current at 3 V, and support for external crystal or LC oscillators up to 150 MHz or 1 GHz respectively.

Technical Context

The SA636DK/01 implements a single-conversion architecture with a Gilbert-cell mixer and integrated oscillator, optimized for 10.7 MHz IF operation using 330 Ω source/load impedance. Its IF amplifier chain provides 38 dB gain and 25 MHz small-signal bandwidth, while the limiter stage adds 54 dB gain with 28 MHz bandwidth - both stages designed for direct interface with ceramic or crystal filters without external matching.

RSSI generation uses a temperature-compensated logarithmic detector with rail-to-rail op-amp output (RSSI_OUT), accessible via feedback pin (RSSI_FEEDBACK) for gain adjustment or filtering. Power-down mode reduces ICC to 200 μA when POWER_DOWN_CTRL is LOW, with CMOS/TTL-compatible input logic and 5 μs typical turn-off time.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.7 V to 5.5 V - enables battery-powered portable operation with stable performance down to 2.7 V.
Supply Current (Active)	6.5 mA typical at 3 V - low quiescent draw suitable for handheld devices with extended runtime.
Mixer Conversion Gain	11 dB at 240 MHz - ensures strong IF signal generation from weak RF inputs in narrowband systems.
RSSI Dynamic Range	>90 dB - supports precise signal strength measurement across cellular, DECT, and cordless telephone link budgets.
Data Output Bandwidth	≥600 kHz - sufficient for demodulating wideband digital modulation such as DECT's 1.152 Mbps FSK.
IF Amplifier Input Impedance	330 Ω - matches standard 10.7 MHz ceramic filters directly, eliminating external matching networks.
Power-Down Current	0.2 mA typical - reduces standby consumption during idle periods in intermittent-reception applications.

Pinout & Package

SA636DK/01,112 is housed in a plastic shrink small outline package (SSOP20), SOT266-1, with 20 leads, 0.65 mm pitch, and 4.4 mm body width. The exposed die attach paddle is not electrically connected in this variant and must be left floating or grounded per layout best practices.

Pin/Terminal	Circuit Role	Design Meaning
RF_IN (Pin 1)	RF input terminal	Single-ended 700 Ω input for frequencies up to 500 MHz; requires decoupling at RF_IN_DECOUPL (Pin 2).
OSC_OUT (Pin 3) / OSC_IN (Pin 4)	Oscillator interface	Supports crystal (≤150 MHz) or LC tank (≤1 GHz) configurations; emitter-follower output and base input topology.
VCC (Pin 5)	Positive supply	Accepts 2.7–5.5 V; bypassing with 0.1 μF capacitor at IF_AMP_DECOUPL (Pins 17 & 19) improves sensitivity.
RSSI_FEEDBACK (Pin 6)	RSSI op-amp feedback node	Enables external resistor network to adjust RSSI gain or add low-pass filtering for noise reduction.
RSSI_OUT (Pin 7)	RSSI analog output	Rail-to-rail op-amp output delivering 0.2–0.5 V at −118 dBm IF level; calibrated for log response over 90 dB range.
POWER_DOWN_CTRL (Pin 8)	CMOS/TTL power control	Active-HIGH logic; pulls ICC to 200 μA when driven LOW; high-impedance input minimizes control-line loading.
DATA_OUT (Pin 9)	Demodulated data output	Voltage-mode FM quadrature output with ≥600 kHz bandwidth; drives 100 kΩ loads with 130 mV RMS amplitude.
QUADRATURE_IN (Pin 10)	Quadrature detector input	AC-coupled port for external 90° phase-shifted IF signal; used with internal IF path for coherent detection.
LIMITER_OUT (Pin 11)	Limiter amplifier output	300 Ω output impedance; feeds quadrature detector and supports direct connection to external audio/data circuits.
LIMITER_DECOUPL (Pins 12 & 13)	Limiter decoupling terminals	Dual 1.23 V bias points requiring local 1 nF capacitors to stabilize limiter DC operating point.
LIMITER_IN (Pin 14)	Limiter amplifier input	330 Ω input impedance; accepts IF signal from IF_AMP_OUT (Pin 16) after interstage 6 dB insertion loss.
GND (Pin 15)	Signal and power ground	Reference for all analog blocks; must be low-impedance and isolated from digital return paths.
IF_AMP_OUT (Pin 16)	IF amplifier output	330 Ω output impedance; connects to limiter input or external filter networks; DC voltage = +1.22 V.
IF_AMP_DECOUPL (Pins 17 & 19)	IF amplifier decoupling	Two dedicated 1.22 V bias nodes requiring separate 0.1 μF bypass capacitors for noise suppression.
IF_AMP_IN (Pin 18)	IF amplifier input	330 Ω input impedance; receives mixer output (MIXER_OUT, Pin 20) through internal 330 Ω load resistor.
MIXER_OUT (Pin 20)	Mixer output terminal	Internally loaded with 330 Ω resistor; compatible with direct connection to 10.7 MHz ceramic filters.

Key Features

Feature	Design Value
Wideband data output	≥600 kHz minimum bandwidth enables reliable demodulation of DECT and other high-data-rate FSK/ASK signals.
Temperature-compensated RSSI	±1.5 dB RSSI variation over −40 °C to +85 °C ensures consistent signal-strength reporting in varying environmental conditions.
Low-power operation	6.5 mA typical ICC at 3 V and 0.2 mA in power-down mode extends battery life in portable communication devices.
High mixer input frequency	Supports RF inputs up to 500 MHz, enabling use in VHF/UHF receivers including 240 MHz and 110.592 MHz DECT bands.
Integrated oscillator flexibility	Accepts crystal (≤150 MHz) or external LC oscillator (≤1 GHz), simplifying LO design for diverse frequency plans.
Low external component count	330 Ω IF/limiter impedances and built-in decoupling pins reduce need for external matching, biasing, and filtering components.

Applications

DECT Base Stations	Digital Cordless Handsets
Use Scenario: 110.592 MHz RF reception with 9.8 MHz IF in ETSI-compliant DECT systems. IC Role / Device Role / Timing Role: Full IF signal processing block - mixing, limiting, quadrature detection, and RSSI generation - replacing discrete IF chains. Use Value: Enables compact, low-power base station designs with 13 dB conversion gain and 700 kHz data bandwidth for 1.152 Mbps FSK.	Use Scenario: Portable handset receiver supporting 240 MHz RF input and 10.7 MHz IF filtering. IC Role / Device Role / Timing Role: Single-chip FM IF subsystem handling RF-to-baseband conversion, signal strength monitoring, and data recovery. Use Value: Delivers 0.54 μV sensitivity (12 dB SINAD) and 90 dB RSSI range, meeting RCR-28 cordless telephone requirements.
FSK/ASK Data Receivers	Portable VHF/UHF Scanners
Use Scenario: Wireless sensor network node receiving 433 MHz ASK-modulated telemetry. IC Role / Device Role / Timing Role: High-speed RSSI and wideband DATA_OUT provide real-time signal quality assessment and clean digital output. Use Value: Fast RSSI rise/fall times (1.1–1.2 μs / 2.0–7.3 μs) enable burst-mode packet detection and adaptive AGC in low-duty-cycle IoT links.	Use Scenario: Battery-powered handheld scanner covering 136–174 MHz VHF and 400–470 MHz UHF bands. IC Role / Device Role / Timing Role: Core IF processor with external LO injection capability supporting wide tuning ranges. Use Value: Mixer NF of 12 dB at 240 MHz and IP3i of −16 dBm ensure usable sensitivity and selectivity in crowded RF environments.

DECT Base Stations

Digital Cordless Handsets

Use Scenario: 110.592 MHz RF reception with 9.8 MHz IF in ETSI-compliant DECT systems.

IC Role / Device Role / Timing Role: Full IF signal processing block - mixing, limiting, quadrature detection, and RSSI generation - replacing discrete IF chains.

Use Value: Enables compact, low-power base station designs with 13 dB conversion gain and 700 kHz data bandwidth for 1.152 Mbps FSK.

Use Scenario: Portable handset receiver supporting 240 MHz RF input and 10.7 MHz IF filtering.

IC Role / Device Role / Timing Role: Single-chip FM IF subsystem handling RF-to-baseband conversion, signal strength monitoring, and data recovery.

Use Value: Delivers 0.54 μV sensitivity (12 dB SINAD) and 90 dB RSSI range, meeting RCR-28 cordless telephone requirements.

FSK/ASK Data Receivers

Portable VHF/UHF Scanners

Use Scenario: Wireless sensor network node receiving 433 MHz ASK-modulated telemetry.

IC Role / Device Role / Timing Role: High-speed RSSI and wideband DATA_OUT provide real-time signal quality assessment and clean digital output.

Use Value: Fast RSSI rise/fall times (1.1–1.2 μs / 2.0–7.3 μs) enable burst-mode packet detection and adaptive AGC in low-duty-cycle IoT links.

Use Scenario: Battery-powered handheld scanner covering 136–174 MHz VHF and 400–470 MHz UHF bands.

IC Role / Device Role / Timing Role: Core IF processor with external LO injection capability supporting wide tuning ranges.

Use Value: Mixer NF of 12 dB at 240 MHz and IP3i of −16 dBm ensure usable sensitivity and selectivity in crowded RF environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SA636BS,115	HVQFN20 package (4 × 4 × 0.85 mm); thermal pad requires PCB grounding; Zth(j-a) = 40 K/W vs. 117 K/W for SSOP20.	Better thermal performance for high-density or continuous-duty applications; identical electrical specs and pinout mapping (reordered).	Select SA636BS,115 when board space is constrained and thermal management is critical; verify HVQFN20 layout compliance with DAP grounding.
SA636DK/02J	RSSI output voltage screened to 0.15–0.45 V at −118 dBm IF level (vs. 0.2–0.5 V for SA636DK/01,112); otherwise identical.	Optimized for applications requiring tighter RSSI calibration tolerance, e.g., closed-loop transmit power control in DECT handsets.	Choose SA636DK/02J only if RSSI linearity within ±0.15 V at low signal levels is required; otherwise SA636DK/01,112 offers broader calibration margin.

Compared with SA636BS,115 and SA636DK/02J, SA636DK/01,112 provides the most flexible RSSI calibration range and SSOP20 compatibility for legacy or cost-sensitive designs, while maintaining full functional equivalence in RF/IF performance and power-down behavior.

Availability

SA636DK/01,112 is available at Aetrix Electronics and suitable for DECT base stations, digital cordless telephones, and portable VHF/UHF communications receivers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SA636DK/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 founded by Philips, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The SA636 product line was engineered for high-bandwidth portable communication receivers, targeting low-voltage operation, minimal external component count, and integrated RSSI functionality in single-conversion FM IF architectures.

FAQ

What is the RSSI output voltage range of SA636DK/01,112 at −118 dBm IF level?

The SA636DK/01,112 delivers an RSSI output voltage of 0.2 V to 0.5 V when the IF level is −118 dBm. This calibrated range reflects its logarithmic response over >90 dB dynamic range and is specified under VCC = 3 V and Tamb = 25 °C. The SA636DK/01,112 does not undergo the tighter screening applied to SA636DK/02J (0.15–0.45 V), offering broader tolerance for general-purpose RSSI applications.

Can SA636DK/01,112 operate with an external LO instead of its internal oscillator?

Yes, SA636DK/01,112 supports external LO injection via the OSC_IN (Pin 4) and OSC_OUT (Pin 3) terminals. When using an external buffer, the oscillator section is disabled, and the device functions as a high-performance mixer with 11 dB conversion gain at 240 MHz. The datasheet confirms operation with external LO up to 500 MHz, making SA636DK/01,112 suitable for multi-band or tunable receiver designs.

What is the recommended decoupling strategy for SA636DK/01,112's IF amplifier section?

SA636DK/01,112 requires three dedicated decoupling points for its IF amplifier: IF_AMP_DECOUPL (Pins 17 and 19) and IF_AMP_IN (Pin 18). Each must be bypassed with a 0.1 μF ceramic capacitor to ground. Additionally, RF_IN_DECOUPL (Pin 2) and both LIMITER_DECOUPL pins (12 and 13) need 1 nF capacitors. This multi-node strategy stabilizes DC bias points and suppresses supply-induced intermodulation in the sensitive IF path.

Does SA636DK/01,112 support crystal oscillator configurations, and what is the maximum frequency?

Yes, SA636DK/01,112 supports crystal oscillator configurations up to 150 MHz using the OSC_IN/OSC_OUT pins. The datasheet specifies Butler oscillator topology for crystals in this range, and Hartley or Colpitts configurations up to 100 MHz. Crystal drive level and load capacitance must be selected per manufacturer recommendations; SA636DK/01,112's internal oscillator circuitry is optimized for low-phase-noise operation in portable FM receivers.

How does the power-down mode affect RSSI and DATA_OUT functionality in SA636DK/01,112?

When POWER_DOWN_CTRL (Pin 8) is driven LOW, SA636DK/01,112 enters power-down mode, reducing ICC to 0.2 mA. In this state, RSSI_OUT (Pin 7) and DATA_OUT (Pin 9) become invalid - RSSI falls to 10% of final value in ≤5 μs, and DATA_OUT ceases FM demodulation. All internal amplifiers and oscillators are disabled; full functionality resumes within 10 μs after POWER_DOWN_CTRL returns HIGH.

SA636DK/01,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: SA636

Package/Case:: 20-LSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Obsolete

RF Type:: Cellular, ASK, DECT, FSK, UHF, VHF

Frequency:: 500MHz

Number of Mixers:: 1

Gain:: 11dB

Noise Figure:: 12dB

Secondary Attributes:: Up Converter

Current - Supply:: 6.5mA

Voltage - Supply:: 2.7V ~ 5.5V

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SSOP

SA636DK/01,112 FAQ

1.How can I place an order for SA636DK/01,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA636DK/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 SA636DK/01,112 reliable?

The price and inventory of SA636DK/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 SA636DK/01,112 is usually 5 days.

3.What payment methods are accepted for SA636DK/01,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA636DK/01,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA636DK/01,112?

SA636DK/01,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA636DK/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 SA636DK/01,112?

For technical support, including SA636DK/01,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA636DK/01,112 requirements.

6.How does Aetrix verify that SA636DK/01,112 is sourced from the original manufacturer or authorized distributors?

All SA636DK/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 SA636DK/01,112 meets industry standards.

7.What is the process for return or replacement of SA636DK/01,112?

All SA636DK/01,112 units undergo pre-shipment inspection (PSI). If there is an issue with SA636DK/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 SA636DK/01,112 part is unused and in its original packaging.

Return procedure for SA636DK/01,112:

1.Submit a request within 90 days.

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

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