NXP Semiconductors SA676DK/01,118

Overview

SA676DK/01,118 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 with 3.5 mA typical supply current, delivers 17 dB mixer conversion gain at 45 MHz, and supports RF input up to 100 MHz - designed specifically for analog cordless telephone receivers.

For engineers reviewing the SA676DK/01,118 datasheet, SA676DK/01,118 pinout, SA676DK/01,118 application, or SA676DK/01,118 equivalent, key selection criteria include its 70 dB RSSI dynamic range, 2 MHz IF small-signal bandwidth, 102 dB total IF/limiter gain, absence of external adjustments, and SSOP20 package compatibility with 455 kHz ceramic filters in cost-sensitive portable voice systems.

Technical Context

The SA676DK/01,118 implements a two-stage IF architecture: first-stage IF amplifier (44 dB gain, 5.5 MHz bandwidth) feeds a second-stage limiter (58 dB gain, 4.5 MHz bandwidth), optimized for 455 kHz ceramic filter interfaces with 1.5 kΩ input/output impedance. Its Gilbert-cell mixer features 7.0 dB noise figure and −10 dBm input IP3, while the on-chip oscillator supports crystal, LC, or external LO configurations up to 100 MHz.

Signal path includes AC-coupled quadrature detection with internal 90° phase-shift network, followed by dual op amps - one for audio output (rail-to-rail, 60–120 mV RMS), another for temperature-compensated RSSI (0.5–2.2 V over 70 dB range). All analog blocks share a single 3 V supply and integrate ESD protection exceeding 2000 V HBM.

Key Specifications

Pinout & Package

SA676DK/01,118 is housed in a plastic shrink small outline package (SSOP20) with 20 leads, 4.4 mm body width, and 0.65 mm lead pitch per SOT266-1 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SA606DK/01,118 and MC3362P, the SA676DK/01,118 delivers 22 dB more IF/limiter gain, integrated rail-to-rail audio/RSSI op amps, and 20 dB wider RSSI range - enabling smaller, lower-cost, and more reliable cordless receiver designs without external gain or compensation components.

Availability

SA676DK/01,118 is available at Aetrix Electronics and suitable for cordless telephony, wireless intercom systems, and FM signal monitoring equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for SA676DK/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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The SA676DK/01,118 belongs to NXP's legacy analog radio receiver IC family, engineered specifically for high-integration, low-power FM IF processing in cost-sensitive analog cordless telephone systems.

FAQ

What is the maximum RF input frequency supported by the SA676DK/01,118?

The SA676DK/01,118 supports RF input frequencies up to 100 MHz, as confirmed by its mixer input specification and oscillator capability. This allows direct reception of 45 MHz, 900 MHz (with external downconversion), or other sub-100 MHz FM bands without intermediate stages - verified in Table 6 of the NXP datasheet under "fi" and "fosc" parameters.

Does the SA676DK/01,118 require external passive components for basic operation?

Yes, the SA676DK/01,118 requires external components including a 455 kHz ceramic filter (e.g., Murata CFUKF455KB4X-R0), crystal or LC tank for oscillator, RF/IF decoupling capacitors, and feedback resistors for audio/RSSI op amps. However, it eliminates all external gain-setting, biasing, and trimming components - reducing external part count by >15 versus discrete solutions.

What is the typical supply current of the SA676DK/01,118 at 3 V?

The SA676DK/01,118 draws 3.5 mA typical supply current at 3 V and 25 °C, as specified in Table 5 (Static Characteristics) of the NXP datasheet. Current increases to 5.0 mA maximum across temperature and voltage extremes, supporting battery-powered operation with multi-day talk time in cordless handsets.

Can the SA676DK/01,118 be used with crystal filters instead of ceramic filters?

Yes, the SA676DK/01,118 is compatible with both 455 kHz ceramic and crystal filters due to its 1.5 kΩ IF input/output impedance - which matches common 455 kHz crystal filter impedances. The datasheet explicitly states "no impedance matching network is necessary" for most 455 kHz crystal filters, enabling drop-in replacement in existing designs.

What is the dynamic range of the RSSI output in the SA676DK/01,118?

The SA676DK/01,118 provides a 70 dB RSSI dynamic range, with output voltage spanning 0.5 V at −110 dBm IF level to 2.2 V at −50 dBm IF level (Table 6, Vo(RSSI)). This logarithmic response is temperature-compensated and delivered via a dedicated rail-to-rail op amp - enabling accurate signal-strength estimation across real-world RF conditions.