Renesas M61531FP#RF0G

Overview

M61531FP#RF0G from Renesas Electronics is a 6-channel electronic volume IC with 10-input stereo selector, tone control (±16 dB bass, ±10 dB treble), built-in loudness circuit, and 4-line REC output. It operates from ±7 V analog supplies and 2.7–5.5 V digital supply, delivering <0.05% THD at 0.3 Vrms output, and targets high-fidelity audio signal routing and level management in multi-source AV systems.

For engineers reviewing the M61531FP#RF0G datasheet, M61531FP#RF0G pinout, M61531FP#RF0G application, or M61531FP#RF0G equivalent, key selection criteria include its 0 to –99 dB/1 dB step volume resolution, 3-wire MCU interface timing (min. 4 µs clock cycle), ±7 V analog rail tolerance, JIS-A weighted noise floor of 9–25 µVrms, and support for external L/R bypass input selection.

Technical Context

The M61531FP#RF0G integrates six independent digitally controlled analog volume channels using high-voltage transistor attenuation, each supporting precise 1 dB steps from 0 to –99 dB plus mute (–∞ dB). Its input path includes dual-stage selection: a primary 10-input L/R selector and a secondary 2-input per-channel multi-selector (C, SW, SR, SL, L, R).

Tone processing is implemented via discrete BASS/TREBLE pins with programmable gain settings (–16/+16 dB bass, –10/+10 dB treble), selectable tone block position (pre- or post-volume), and configurable tone input attenuation (0/–6/–12/–18 dB). Loudness compensation uses center-tap topology with on/off control and balance output capability.

Key Specifications

Pinout & Package

Package: 80-pin plastic QFP (14 mm × 20 mm, 0.65 mm pitch), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 6-channel audio volume control applications.

Compared with AK4118VN and CS4361-KQZ, the M61531FP#RF0G uniquely combines 10-input analog selection, tone control, loudness, and REC routing in a single ±7 V analog volume IC-making it optimal for legacy analog source aggregation without DAC conversion.

Availability

M61531FP#RF0G is available at Aetrix Electronics and suitable for home theater receivers, multi-zone audio amplifiers, and Hi-Fi stereo preamps requiring stable component supply, long-lifecycle availability, and guaranteed RoHS compliance.

Supply support for M61531FP#RF0G 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, and power devices for automotive, industrial, and consumer applications.

The M61531FP#RF0G belongs to Renesas' legacy audio signal processing product line, designed specifically for high-fidelity analog audio routing, level control, and tone enhancement in consumer AV equipment.

FAQ

What is the maximum analog supply voltage rating for the M61531FP#RF0G?

The M61531FP#RF0G has an absolute maximum analog supply rating of AVCC–AVEE = ±8.0 V. The recommended operating range is AVCC = +4.5 to +7.5 V and AVEE = –7.5 to –4.5 V, with +7.0 V / –7.0 V being the typical bias point. Exceeding ±8.0 V risks permanent damage to the internal high-voltage transistors used in the volume attenuation circuitry of the M61531FP#RF0G.

Does the M61531FP#RF0G support I²C or only 3-wire serial control?

The M61531FP#RF0G supports only the proprietary 3-wire serial interface (CLOCK/DATA/LATCH) with fixed 24-bit frame format and timing requirements (min. 4 µs clock cycle). It does not implement I²C, SMBus, or SPI protocols. Control data must be shifted in MSB-first on the rising edge of CLOCK, then latched on the rising edge of LATCH to update registers in the M61531FP#RF0G.

What is the function of pins 14, 15, 17, and 18 on the M61531FP#RF0G?

Pins 14 and 15 are BALANCE L/+ and LOUD L/BALANCE L/–, forming a differential output pair for left-channel balance or loudness tap. Pins 17 and 18 serve the same function for the right channel (BALANCE R/+ and LOUD R/BALANCE R/–). These pins enable hardware-level balance adjustment or loudness compensation without external op-amps, and their operation is controlled by register bits D13d and D14d in the M61531FP#RF0G configuration space.

Can the M61531FP#RF0G drive headphones directly?

No, the M61531FP#RF0G is not designed to drive headphones directly. Its outputs (e.g., LOUT, ROUT) are line-level (max 4.2 Vrms into 10 kΩ) with 47 kΩ output impedance-intended for connection to power amplifier inputs, not low-impedance headphone loads. Driving headphones would require external buffer amplifiers. The M61531FP#RF0G's architecture focuses on signal routing and level control within AV receivers, not current delivery.

How does the loudness circuit in the M61531FP#RF0G operate?

The M61531FP#RF0G implements a center-tap loudness circuit that applies frequency-dependent boost below ~1 kHz to compensate for reduced human ear sensitivity at low listening volumes. Activation is controlled by bit D13d; when enabled, it modifies the L/R channel signal path using internal RC networks tied to pins 15 and 18. The circuit operates independently of tone controls and requires no external components-its behavior is fully defined in the M61531FP#RF0G datasheet section "Loudness" on page 8.