NXP Semiconductors SA58641DK,118

Overview

SA58641DK,118 from NXP Semiconductors is a monolithic FM intermediate frequency (IF) system with integrated mixer/oscillator, dual limiting IF amplifiers, quadrature detector, temperature-compensated logarithmic RSSI, wideband data output, and power-down control. It operates down to 3 V, delivers 92 dB IF/limiter gain, supports RF input up to 500 MHz, and achieves 600 kHz minimum data bandwidth-designed for DECT and portable digital cordless telephony.

For engineers reviewing the SA58641DK,118 datasheet, SA58641DK,118 pinout, SA58641DK,118 application, or SA58641DK,118 equivalent, key selection criteria include its 12 dB noise figure at 240 MHz, rail-to-rail RSSI op amp with feedback access, CMOS/TTL-compatible power-down logic, 330 Ω IF/limiter impedance matching, and SSOP20 package compatibility with 10.7 MHz ceramic filters.

Technical Context

The SA58641DK,118 implements a single-conversion architecture with a Gilbert-cell mixer and internal oscillator capable of >1 GHz in LC configurations or up to 150 MHz with crystal-based Butler oscillators. Its IF chain features two cascaded 330 Ω-terminated stages optimized for 10.7 MHz operation, delivering 38 dB IF amplifier gain and 54 dB limiter gain with 25 MHz small-signal bandwidth.

RSSI generation uses a temperature-compensated logarithmic detector with >90 dB dynamic range and fast rise/fall times (1.1–1.2 µs rise, 2.0–7.3 µs fall), while the DATA_OUT stage provides voltage-mode demodulation with 700 kHz typical 3 dB bandwidth. Power-down mode reduces supply current to 200 µA via active-HIGH POWER_DOWN_CTRL (Pin 8).

Key Specifications

Pinout & Package

SA58641DK,118 is housed in a plastic shrink small outline package (SSOP20), SOT266-1 variant, with 20 leads, 4.4 mm body width, and 0.65 mm lead pitch. The package is moisture sensitivity level (MSL) 3 and reflow-solderable per J-STD-020C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SA605D and NE612DR2G, the SA58641DK,118 integrates full IF signal chain functionality-including limiting amplifiers, quadrature detection, and temperature-stable RSSI-with 22 dB higher gain, 300× lower power-down current, and native support for 600 kHz digital data, making it uniquely suited for modern portable digital radio systems.

Availability

SA58641DK,118 is available at Aetrix Electronics and suitable for DECT base stations, digital cordless telephones, portable high-performance communications receivers, and FSK/ASK data receivers requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).

Supply support for SA58641DK,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 communication markets, with deep expertise in RF front-end and mixed-signal IC design.

The SA58641DK,118 belongs to NXP's high-performance FM IF receiver family, engineered specifically for battery-operated digital cordless telephony and wideband data demodulation in compact portable radios.

FAQ

What is the operating supply voltage range for the SA58641DK,118?

The SA58641DK,118 operates from 3.0 V to 5.5 V, enabling direct integration into 3 V battery-powered systems without regulation. At 5 V, typical supply current is 7.5 mA in active mode and drops to 200 µA in power-down mode. The device maintains full RF performance down to 3 V, supporting long-life portable applications.

How does the RSSI output of the SA58641DK,118 interface with external circuitry?

The SA58641DK,118 provides an internal rail-to-rail op amp for RSSI output (Pin 7), with negative feedback accessible at Pin 6 (RSSI_FEEDBACK). This allows designers to add external gain-setting resistors or low-pass filters. RSSI voltage ranges from 0.2 V to 2.3 V across −90 dBm to −10 dBm IF input levels, with ±2.0 dB temperature stability over −40 °C to +85 °C.

Can the SA58641DK,118 be used with 10.7 MHz ceramic filters without impedance matching?

Yes - the SA58641DK,118 features 330 Ω IF amplifier and limiter input/output impedances, which match standard 10.7 MHz ceramic filters (e.g., Murata SFE10.7MA5-A) directly. No external matching network is required, simplifying layout and reducing component count. This is confirmed in both functional description and Table 8 of the datasheet.

What is the maximum RF input frequency supported by the SA58641DK,118 mixer stage?

The SA58641DK,118 mixer supports RF input frequencies up to 500 MHz, as specified in Table 7 (Dynamic Characteristics). In practice, it has been validated at 240 MHz (NF = 12 dB) and 110.592 MHz (DECT), with oscillator operation exceeding 1 GHz in LC tank configurations - making it suitable for VHF, UHF, and low-band cellular receivers.

Does the SA58641DK,118 include a built-in oscillator, and what are its frequency limits?

The SA58641DK,118 includes an on-chip oscillator that supports crystal configurations up to 150 MHz (Butler topology) and LC tank configurations beyond 1 GHz. Pin 3 (OSC_OUT) and Pin 4 (OSC_IN) provide emitter-base connections for external crystal or LC networks. Oscillator frequency is tunable and optimized for 10.7 MHz IF systems, but not fixed internally.