NXP Semiconductors SA676DK/01,112

Overview

SA676DK/01,112 from NXP Semiconductors is a low-voltage monolithic FM intermediate frequency (IF) system IC integrating mixer/oscillator, dual limiting IF amplifiers, quadrature detector, logarithmic RSSI, voltage regulator, and dual rail-to-rail op amps. It operates at 3 V typical supply, delivers 17 dB mixer conversion gain at 45 MHz, provides 70 dB RSSI dynamic range, and targets analog cordless telephone receivers.

For engineers reviewing the SA676DK/01,112 datasheet, SA676DK/01,112 pinout, SA676DK/01,112 application, or SA676DK/01,112 equivalent, this page delivers verified functional identity, SSOP20 package mapping, 20-pin terminal roles, confirmed RF/IF performance metrics, and real-world design constraints for FM IF signal chain implementation.

Technical Context

The SA676DK/01,112 implements a second-IF architecture with 455 kHz center frequency, using a Gilbert cell mixer with integrated oscillator capable of >100 MHz operation in LC or crystal configurations. Its IF amplifier/limiter chain delivers 44 dB + 58 dB gain across two stages, optimized for 1.5 kΩ source impedance to interface directly with 455 kHz ceramic filters without external matching.

Signal processing includes a quadrature detector with internal IF-driven multiplier and AC-coupled phase-shifted input, plus dual op amps - one for audio output (rail-to-rail, 60–120 mV RMS), another for RSSI conditioning (0.5–2.2 V over 70 dB range). Temperature-compensated logarithmic RSSI output and ESD protection exceeding 2000 V HBM are built-in.

Key Specifications

Pinout & Package

SA676DK/01,112 is housed in a plastic shrink small outline package (SSOP20) with 20 leads and 4.4 mm body width (SOT266-1). The package supports fine-pitch surface-mount assembly and meets JEDEC MO-152 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SA676DK/01,112, SA606DK/01 lacks integrated RSSI amplification and delivers 22 dB less IF gain, while MC3362P uses obsolete packaging, consumes nearly twice the current, and offers significantly reduced RSSI range - making SA676DK/01,112 the optimal choice for new low-power, high-dynamic-range FM IF designs.

Availability

SA676DK/01,112 is available at Aetrix Electronics and suitable for cordless telephony, wireless intercoms, FM audio monitoring, and battery-powered RF receiver applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for SA676DK/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 core expertise in RF, analog, and mixed-signal IC design.

The SA676DK/01,112 belongs to NXP's legacy FM receiver IC family, engineered specifically for cost-sensitive, low-power analog cordless telephone systems requiring integrated IF signal processing without external tuning.

FAQ

What is the primary function of the SA676DK/01,112 in an FM receiver design?

The SA676DK/01,112 serves as a complete FM intermediate frequency (IF) signal processor, integrating mixer/oscillator, dual limiting IF amplifiers, quadrature detector, logarithmic RSSI generator, voltage regulator, and dual rail-to-rail op amps. It converts RF input (up to 100 MHz) to baseband audio while providing precise signal strength indication - all within a single SSOP20 package. This eliminates 12+ discrete components typically needed in analog cordless telephone receivers.

Does the SA676DK/01,112 support crystal-based oscillator configurations?

Yes, the SA676DK/01,112 supports crystal-based oscillator configurations via pins 3 (OSC_OUT) and 4 (OSC_IN), with documented operation up to 100 MHz using Hartley or Colpitts topologies. The datasheet confirms compatibility with a 44.545 MHz crystal (ICM4712701) on the reference demo board, and specifies that crystal configurations are valid up to 100 MHz - enabling stable local oscillator generation without external synthesizers.

What is the recommended supply decoupling for the SA676DK/01,112?

The SA676DK/01,112 requires two-tier supply decoupling: a 0.1 µF ceramic capacitor placed as close as possible to pin 6 (VCC), and a 10–15 µF tantalum capacitor on the main supply rail. The datasheet states that the 0.1 µF bypass improves sensitivity by 2–3 dB, while the larger tantalum capacitor is "essential" for consistent production sensitivity. Both capacitors must be grounded near their respective connection points to minimize noise coupling into the RF and IF sections.

Can the SA676DK/01,112 interface directly with standard 455 kHz ceramic filters?

Yes, the SA676DK/01,112 is explicitly designed for direct interface with standard 455 kHz ceramic filters. Its IF amplifier input impedance (1.5 kΩ) and mixer output resistance (1.5 kΩ) match the characteristic impedance of Murata CFUKF455KB4X-R0 and similar filters, eliminating the need for external impedance-matching networks. The datasheet confirms this in Section 7 and lists the Murata filter as the reference component in Table 7.

What is the guaranteed RSSI output voltage range of the SA676DK/01,112?

The SA676DK/01,112 delivers a guaranteed RSSI output voltage range of 0.5 V to 2.2 V over its full 70 dB dynamic input range. At −110 dBm IF input level, RSSI output is 0.5–0.9 V; at −50 dBm, it rises to 1.7–2.2 V. This logarithmic response is temperature-compensated and conditioned by an internal rail-to-rail op amp, allowing direct ADC interfacing or analog AGC implementation without external signal conditioning.