Renesas M61540FP#DF0R

Overview

M61540FP#DF0R from Renesas Electronics is a 6-channel audio signal processor IC for home audio systems, integrating independent electronic volume control (0 to –99 dB in 1 dB steps), 6-channel gain control (0/6/12/18 dB), 5-input stereo selector, dual-band tone control (bass/treble ±14 dB), REC output routing, and built-in ADC output pins. It operates with AVCC = 7.0 V, AVEE = –7.0 V, DVDD = 3.0–5.5 V and targets multi-source AV receivers and surround sound preamplifiers.

For engineers reviewing the M61540FP#DF0R datasheet, M61540FP#DF0R pinout, M61540FP#DF0R application, or M61540FP#DF0R equivalent, key selection considerations include its 40-pin FP package, analog/digital dual-supply architecture, serial MCU interface (CLOCK/DATA), channel-specific attenuation resolution, and tone control frequency response (100 Hz bass / 10 kHz treble).

Technical Context

The M61540FP#DF0R implements a fully integrated analog signal path with digitally controlled voltage-variable resistors for volume and gain stages, using high-voltage transistors to support ±7 V analog rails. Its input selector supports five stereo sources with dedicated L/R pins per source and REC output re-routing capability.

Tone control uses discrete passive RC networks (BASL1/BASL2, BASR1/BASR2, TREL/TRER) to set bass center frequency (~100 Hz) and treble center frequency (~10 kHz), with programmable boost/cut up to ±14 dB in 2 dB steps. The ADC output pins (ADCL/ADCR) provide buffered analog signals for external digitization.

Key Specifications

Pinout & Package

Package: FP-40B (40-pin plastic flatpack, JEITA-compliant, 9.0 × 7.0 mm body, 0.65 mm lead pitch, 0.2 g mass).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar audio signal processor applications.

Compared with AK4118VN and CS4272-KQZ, the M61540FP#DF0R delivers fully integrated analog signal conditioning - including 6-channel volume, 5-input selection, and passive tone control - without requiring external memory, clock trees, or digital audio infrastructure, making it optimal for cost-sensitive, analog-first home audio designs.

Availability

M61540FP#DF0R is available at Aetrix Electronics and suitable for home theater AV receivers, multi-source stereo preamplifiers, surround sound processor modules, and audio distribution amplifiers requiring stable component supply and long-term industrial availability.

Supply support for M61540FP#DF0R 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.

The M61540FP#DF0R belongs to Renesas' legacy audio signal processor product line, designed specifically for analog-centric home audio equipment requiring high-channel-count volume control, source selection, and tone adjustment without digital signal processing overhead.

FAQ

What is the maximum output voltage swing supported by the M61540FP#DF0R?

The M61540FP#DF0R supports a maximum output voltage of 4.4 Vrms under specified conditions (THD = 1%, RL = 10 kΩ, Output Gain Control = +6 dB). This is enabled by its ±7 V analog supply rails (AVCC = 7 V, AVEE = –7 V), allowing sufficient headroom for line-driving applications in home theater systems. The M61540FP#DF0R achieves this while maintaining <0.002% THD+N at lower output levels.

Does the M61540FP#DF0R require external passive components for tone control?

Yes, the M61540FP#DF0R requires external resistors and capacitors connected to pins BASL1/BASL2 (left bass), BASR1/BASR2 (right bass), TREL (left treble), and TRER (right treble) to set center frequencies and Q factors. The datasheet provides recommended values (e.g., 4.7 kΩ, 0.047 µF, 0.15 µF) for 100 Hz bass and 10 kHz treble response. The M61540FP#DF0R does not include internal tone filter components.

How many input sources can be selected simultaneously on the M61540FP#DF0R?

The M61540FP#DF0R supports selection of one stereo input source at a time from five available sources (IN1–IN5), each with dedicated L/R pins (INL1–INL5, INR1–INR5). While only one source is active in the main signal path, the REC output function allows two inputs (e.g., IN4 and IN5) to be routed simultaneously to the REC output pins - enabling monitoring and recording of different sources. The M61540FP#DF0R does not support true multi-source mixing.

What is the function of the ADCR and ADCL pins on the M61540FP#DF0R?

The ADCR and ADCL pins on the M61540FP#DF0R provide buffered analog outputs tapped *before* the electronic volume stage, delivering the raw input signal (post-gain control, pre-volume) for external analog-to-digital conversion. These pins enable simultaneous analog output to power amplifiers and digital capture for recording or analysis - eliminating need for external signal splitters. The M61540FP#DF0R specifies JIS-A weighted noise performance for these outputs.

Is the M61540FP#DF0R compatible with 3.3 V-only digital systems?

Yes, the M61540FP#DF0R supports DVDD = 3.0–5.5 V, making it compatible with 3.3 V MCU interfaces. Its DATA and CLOCK inputs accept logic "H" ≥ DVDD × 0.7 V and logic "L" ≤ DVDD × 0.2 V, ensuring reliable communication with standard 3.3 V microcontrollers. However, the analog section remains independent at ±7 V, so level-shifting is unnecessary for the digital interface - the M61540FP#DF0R natively supports mixed-supply system architectures.