NXP Semiconductors SA606D/01,112

Overview

SA606D/01,112 from NXP Semiconductors is a low-voltage monolithic FM IF system integrating mixer/oscillator, dual limiting IF amplifiers, quadrature detector, logarithmic RSSI, voltage regulator, and rail-to-rail audio/RSSI op amps. It operates down to 2.7 V, delivers 17 dB mixer conversion gain at 45 MHz, provides 102 dB total IF/limiter gain, and supports RF input up to 150 MHz - enabling portable cellular radio and cordless phone receivers.

For engineers reviewing the SA606D/01,112 datasheet, SA606D/01,112 pinout, SA606D/01,112 application, or SA606D/01,112 equivalent, key selection criteria include its 90 dB RSSI dynamic range, 2.7–7.0 V supply range, SO20 package compatibility, and verified performance in 455 kHz IF architectures with ceramic or crystal filters.

Technical Context

The SA606D/01,112 implements a Gilbert-cell mixer with integrated oscillator capable of >150 MHz operation using LC or crystal configurations, and features a two-stage IF signal path: first-stage IF amplifier (43 dB gain, 5.5 MHz bandwidth) followed by limiter (60 dB gain, 4.5 MHz bandwidth), optimized for 455 kHz center frequency with 1.5 kΩ impedance matching.

Its quadrature detector accepts AC-coupled IF input and internal IF reference to generate FM-demodulated audio, while the temperature-compensated logarithmic RSSI provides ≥90 dB dynamic range with rail-to-rail output op amps accessible via dedicated feedback pins (AUDIO_FEEDBACK and RSSI_FEEDBACK) for gain adjustment and filtering.

Key Specifications

Pinout & Package

SA606D/01,112 is housed in a plastic small outline package (SO20) per SOT163-1, with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch - compatible with industry-standard reflow soldering and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SA606DK/01,112 and SA616D/01,112, the SA606D/01,112 offers proven reliability in legacy portable radios and lower thermal resistance in SO20, while SA616D/01,112 delivers measurable improvements in noise and power - making it ideal for next-generation battery-sensitive applications.

Availability

SA606D/01,112 is available at Aetrix Electronics and suitable for portable cellular radio FM IF, cordless phone receivers, and wireless RF level meters requiring stable component supply and long-term industrial availability.

Supply support for SA606D/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 communication markets, with deep expertise in RF analog and mixed-signal IC design.

The SA606 product line was engineered specifically for low-voltage, high-sensitivity FM IF processing in portable wireless devices - emphasizing integration, battery efficiency, and compliance with cellular radio specifications.

FAQ

What is the minimum operating voltage for the SA606D/01,112?

The SA606D/01,112 operates down to 2.7 V, enabling direct use with single-cell lithium-ion or two-cell alkaline batteries without intermediate regulation. This low-voltage capability is confirmed in Table 6 (Static Characteristics) of the NXP datasheet Rev. 6, with full functionality maintained across the −40 °C to +85 °C ambient range. The SA606D/01,112 maintains specified mixer gain, RSSI linearity, and audio output performance at 2.7 V.

Does the SA606D/01,112 support crystal oscillator configurations above 45 MHz?

Yes, the SA606D/01,112 supports crystal oscillator configurations up to 150 MHz using a Butler oscillator topology, as documented in Section 7 (Functional Description). For frequencies up to 100 MHz, Hartley or Colpitts configurations are recommended. The SA606D/01,112 oscillator section is fully functional with external crystals or LC tanks, and the datasheet confirms operation beyond 45 MHz in both crystal and LC modes.

Can the SA606D/01,112 drive a 455 kHz ceramic filter directly without matching components?

Yes, the SA606D/01,112 is designed for direct connection to standard 455 kHz ceramic filters. Its MIXER_OUT pin has a nominal 1.5 kΩ output impedance, and the IF_AMP_IN pin presents 1.5 kΩ input impedance - matching the characteristic impedance of Murata CFUKF455KB4X-R0 and similar filters. The datasheet explicitly states "no impedance matching network is necessary" for most 455 kHz ceramic and crystal filters.

What is the measured sensitivity of the SA606D/01,112 at 45 MHz input?

The SA606D/01,112 achieves 0.31 µV sensitivity into a 50 Ω matching network for 12 dB SINAD with 1 kHz tone modulation at 45 MHz RF and 455 kHz IF, as specified in Section 2 (Features and benefits). This corresponds to −116 dBm input power and is verified under standardized test conditions (Figure 10, Table 7). Sensitivity remains stable across temperature and supply voltage variations per Figures 9–12.

How is RSSI output voltage scaled on the SA606D/01,112?

The SA606D/01,112 RSSI output voltage scales linearly with input RF level across a 90 dB range: 0.3 V at −118 dBm, 1.1 V at −68 dBm, and 2.5 V at −23 dBm (Table 7, Vo(RSSI) row). This logarithmic response is temperature-compensated to ±1.5 dB over −40 °C to +85 °C. The RSSI_FEEDBACK pin allows external resistor networks to adjust output scaling or add second-order compensation if required.