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NXP Semiconductors SA636DK/02J
- Part No.:
- SA636DK/02J
- Manufacturer:
- NXP Semiconductors
- Category:
- RF Mixers
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SA636DK/02J.pdf
- Description:
- IC MIXER 500MHZ RSSI 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,521
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Product details
Overview
SA636DK/02J from NXP Semiconductors is a low-voltage, high-performance FM IF system IC 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 operates down to 2.7 V and targets portable digital cordless telephony (e.g., DECT) requiring stable signal strength indication and wideband FSK/ASK demodulation.
For engineers reviewing the SA636DK/02J datasheet, SA636DK/02J pinout, SA636DK/02J application, or SA636DK/02J equivalent, key selection criteria include its screened RSSI output voltage (0.15–0.45 V at −118 dBm IF), SSOP20 package compatibility, 2.7–5.5 V supply range, 6.5 mA typical ICC, and 10.7 MHz/9.8 MHz IF filter matching capability.
Technical Context
The SA636DK/02J implements a single-conversion FM IF architecture with a Gilbert-cell mixer (NF = 12 dB, Gp = 11 dB at 240 MHz), 92 dB total IF/limiter gain, and 25 MHz small-signal limiter bandwidth optimized for 10.7 MHz ceramic filters. Its internal RSSI uses a temperature-compensated log amplifier with rail-to-rail op-amp output and external feedback (RSSI_FEEDBACK pin) for gain adjustment or filtering.
It supports both crystal (≤150 MHz) and LC (≤1 GHz) oscillator configurations, features CMOS/TTL-compatible POWER_DOWN_CTRL (active HIGH), and delivers fast RSSI rise/fall times (1.1–1.2 µs / 2.0–7.3 µs) with 0.2 mA standby current. The device is specified for −40 °C to +85 °C operation and includes ESD protection exceeding 2000 V HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V - enables battery-powered portable designs with brownout margin |
| Supply Current (Active) | 6.5 mA typical at 3 V - low power consumption critical for handheld devices |
| RSSI Output Range | 90 dB dynamic range - supports precise signal strength measurement across weak to strong RF inputs |
| Data Output Bandwidth | ≥600 kHz - sufficient for DECT and other wideband FSK/ASK data demodulation |
| Mixer Noise Figure | 12 dB at 240 MHz - ensures high sensitivity in VHF/UHF receiver front-ends |
| IF Input Impedance | 330 Ω - direct interface with standard 10.7 MHz ceramic or crystal filters without matching network |
| Power-Down Current | 0.2 mA typical - reduces system power during idle periods while retaining fast wake-up (10 µs) |
Pinout & Package
SA636DK/02J is housed in a plastic shrink small outline package (SSOP20), SOT266-1, with 20 leads, body width 4.4 mm, and 0.65 mm lead pitch. The exposed die attach paddle must be connected to ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN (1) | RF input to mixer | Single-ended 700 Ω input impedance; accepts up to 500 MHz RF signals |
| RSSI_FEEDBACK (6) | Negative feedback terminal for RSSI op amp | Enables external gain setting or low-pass filtering of RSSI output |
| POWER_DOWN_CTRL (8) | Power-down enable control | CMOS/TTL-compatible active-HIGH logic; pulls ICC to 0.2 mA when LOW |
| DATA_OUT (9) | Demodulated wideband data output | Voltage-mode output supporting ≥600 kHz bandwidth for FSK/ASK recovery |
| QUADRATURE_IN (10) | Quadrature detector input | Accepts AC-coupled 90° phase-shifted IF signal for FM demodulation |
| LIMITER_DECOUPL (12,13) | Limiter stage decoupling terminals | Dual 330 Ω-terminated pins requiring local 1 nF bypass capacitors |
| GND (15) | Ground reference | Must connect to PCB ground plane; die attach paddle also tied to GND |
Key Features
| Feature | Design Value |
|---|---|
| Screened RSSI output | Vo(RSSI) = 0.15–0.45 V at −118 dBm IF level - tighter tolerance than SA636DK/01 for precision RSSI applications |
| Wideband data output | ≥600 kHz minimum bandwidth - supports DECT 1.88–1.90 GHz and other high-data-rate wireless protocols |
| Low-power operation | 6.5 mA typical ICC at 3 V and 0.2 mA in power-down - extends battery life in portable receivers |
| Integrated oscillator support | Crystal oscillator effective to 150 MHz; LC tank oscillator compatible to 1 GHz - flexible LO generation |
| Temperature-compensated RSSI | ±1.5 dB RSSI variation over −40 °C to +85 °C - stable signal strength reporting across environmental conditions |
Applications
| DECT Cordless Telephony | Digital Cellular Handsets |
|---|---|
Use Scenario: 1.88–1.90 GHz DECT base station or handset receiving 9.8 MHz IF with 288 kHz deviation FSK modulation. IC Role / Device Role / Timing Role: FM IF signal processor performing mixing, limiting, quadrature detection, and RSSI generation. Use Value: Enables robust voice/data link with 700 kHz data bandwidth and screened RSSI (0.15–0.45 V) for accurate channel quality assessment. | Use Scenario: Single-conversion VHF/UHF receiver in GSM/AMPS handsets operating at 10.7 MHz IF with 12 dB SINAD requirement. IC Role / Device Role / Timing Role: Complete IF subsystem delivering 92 dB gain, 12 dB noise figure, and temperature-stable RSSI. Use Value: Achieves 0.54 µV sensitivity into 50 Ω and meets AMPS/RCR-28 cellular cordless specifications with minimal external components. |
| Wireless LAN Receivers | FSK/ASK Data Receivers |
Use Scenario: Low-power 2.4 GHz ISM band receiver using external LO injection and 10.7 MHz IF filtering. IC Role / Device Role / Timing Role: High-linearity IF processor with 54 dB limiter gain and 330 Ω input/output impedance. Use Value: Supports narrowband and wideband IF architectures with no impedance-matching networks required for standard ceramic filters. | Use Scenario: Industrial telemetry receiver demodulating 100–500 kHz FSK/ASK signals in noisy environments. IC Role / Device Role / Timing Role: Wideband data output stage with rail-to-rail op-amp buffering and fast RSSI response (1.1 µs rise). Use Value: Delivers clean, high-SNR data output and real-time signal strength monitoring for adaptive receiver gain control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FM IF processing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SA636DK/01 | RSSI output at −118 dBm IF is 0.2–0.5 V (wider tolerance); otherwise identical functionality and pinout | Suitable where RSSI calibration flexibility is preferred over tight screening | Select SA636DK/01 when RSSI absolute accuracy is less critical than cost or inventory consolidation |
| SA636BS | HVQFN20 package (4 × 4 × 0.85 mm), lower thermal impedance (40 K/W vs. 117 K/W), same electrical specs | Better thermal performance in space-constrained, high-density PCB layouts | Choose SA636BS for thermally demanding applications or when HVQFN20 footprint is already standardized |
Compared with SA636DK/01 and SA636BS, SA636DK/02J provides the narrowest RSSI output voltage window (0.15–0.45 V) at −118 dBm IF level, making it optimal for systems requiring precise, factory-calibrated signal strength reporting without post-production trimming - while maintaining full functional and pin compatibility with both alternatives.
Availability
SA636DK/02J is available at Aetrix Electronics and suitable for DECT cordless telephony, digital cellular handsets, and wireless data receivers requiring stable component supply, extended temperature operation (−40 °C to +85 °C), and RoHS-compliant packaging.
Supply support for SA636DK/02J 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, founded by Philips, is a global leader in high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets.
The SA636 product line was designed specifically for portable, battery-operated FM IF signal processing in digital cordless telephones and single-conversion VHF/UHF receivers - emphasizing low voltage operation, integrated RSSI, and minimal external component count.
FAQ
What is the key functional difference between SA636DK/02J and SA636DK/01?
The SA636DK/02J is screened to deliver a tighter RSSI output voltage range of 0.15 V to 0.45 V when the IF level is −118 dBm, whereas SA636DK/01 specifies 0.2 V to 0.5 V under the same condition. All other electrical, thermal, and mechanical characteristics - including pinout, supply current, bandwidth, and package - are identical between SA636DK/02J and SA636DK/01.
Does SA636DK/02J support internal oscillator operation?
Yes, SA636DK/02J supports both internal and external oscillator configurations. Its oscillator section accepts crystal (up to 150 MHz) or LC tank (up to 1 GHz) implementations. When using internal oscillation, the SA636DK/02J achieves an RSSI output of 1.4 V at −10 dBm RF level and maintains 12 dB SINAD at −106 dBm RF input, as verified in system-level testing per the datasheet.
What is the recommended decoupling for LIMITER_DECOUPL pins on SA636DK/02J?
The SA636DK/02J has two LIMITER_DECOUPL pins (12 and 13), each requiring a dedicated 1 nF ceramic capacitor connected directly to ground. These pins provide local AC ground for the limiter stage and must be decoupled close to the package to maintain stability and prevent oscillation - especially critical given the 25 MHz small-signal bandwidth and 54 dB limiter gain specified in the datasheet.
Can SA636DK/02J be used with 9.8 MHz IF filters in DECT applications?
Yes, SA636DK/02J is explicitly validated for 9.8 MHz IF operation in DECT systems, as shown in Figure 15 and Table 9 of the datasheet. At 110.592 MHz RF and 9.8 MHz IF, it delivers 13 dB mixer conversion gain, 12 dB noise figure, and 700 kHz data bandwidth - fully meeting DECT spectral and sensitivity requirements without modification to the SA636DK/02J itself.
What is the thermal resistance (Zth(j-a)) of SA636DK/02J in its SSOP20 package?
The transient thermal impedance from junction to ambient for SA636DK/02J in the SSOP20 package (SOT266-1) is 117 K/W, as specified in Table 6 of the datasheet. This value assumes standard JEDEC test board conditions and confirms the device's suitability for moderate-power portable applications where ambient temperatures remain within −40 °C to +85 °C.
SA636DK/02J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- SA636
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- RF Type:
- General Purpose
- Frequency:
- 500MHz
- Number of Mixers:
- 2
- Gain:
- 11dB
- Noise Figure:
- 12dB
- Secondary Attributes:
- -
- Current - Supply:
- 6.5mA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SA636DK/02J FAQ
1.How can I place an order for SA636DK/02J through Aetrix?
Please submit a Request for Quotation (RFQ) for SA636DK/02J 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/02J reliable?
The price and inventory of SA636DK/02J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA636DK/02J is usually 5 days.
3.What payment methods are accepted for SA636DK/02J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA636DK/02J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA636DK/02J?
SA636DK/02J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA636DK/02J 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/02J?
For technical support, including SA636DK/02J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA636DK/02J requirements.
6.How does Aetrix verify that SA636DK/02J is sourced from the original manufacturer or authorized distributors?
All SA636DK/02J 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/02J meets industry standards.
7.What is the process for return or replacement of SA636DK/02J?
All SA636DK/02J units undergo pre-shipment inspection (PSI). If there is an issue with SA636DK/02J, 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/02J part is unused and in its original packaging.
Return procedure for SA636DK/02J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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