New Product Bulletin Sound Processors for Car AV Systems BD37033FV / BD37034FV / BD37068FV High Fidelity + High Definition Audio Product Outline SSOP-B28 In recent years, with the increasing proliferation of EVs and HEVs that provide silent operation comes a greater demand for increased fidelity in car AV equipment. ROHM sound processors utilize the most advanced proprietary analog technology for lower noise and distortion, contributing to greater system sound quality. In addition, advanced switching technology reduces popping noises during volume/tone adjustment, and a special function is included that cuts unpleasant noise induced in audio equipment when receiving phone calls (an industry first). The BD37034FV also integrates a function that prevents sound leakage during power OFF, resulting in higher audio fidelity and definition in car AV systems. SSOP-B40 ■ Superior noise and distortion countermeasures Distortion Reduction Frequency vs. Noise 1 Without Function -100 Before Improvement Before Improvement -110 Noise [dB] 0.1 THD+N [%] Advanced Switching Function Noise Reduction Output Amplitude vs. Distortion 0.01 0.001 0.0001 0.001 ■ Smooth, natural volume and tone adjustment With Function M a g n i f i e d -120 M a g n i f i e d -130 After Improvement 0.005 0.01 0.05 0.1 0.2 0.5 1 2 -140 After Improvement 10 20 50 100 200 500 1k 2k Smooth, natural volume/tone adjustment 5k 10k 20k Frequency [Hz] Vo [Vrms] ROHM utilizes proprietary technology cultivated over many years to minimize both noise and distortion in regions that cannot be reproduced through simulation for superior sound quality. ■ Mobile phone RF noise significantly reduced Volume control is considered the most important function of a sound processor. In order to achieve natural volume control, ROHM integrates advanced switching technology to enable smooth volume adjustment with no popping noise similar to analog methods. ■ No through-audio from external sources (when power is OFF) Through-Audio Power OFF Audio Player Power Amp Conventional New Noise reduced by more than 10x Conventional New Sound leakage reduced by more than 30x Unpleasant noise can be generated when listening to music in the car a few seconds before receiving a phone call. In response, ROHM has developed technology that cuts noise to 1/10th or less vs. conventional levels with no degradation in sound quality, resulting in higher fidelity playback. A special function is also included that reduces audio leakage when the power is OFF, decreasing through-audio from external sources by more than 30 times when using an external power amp. ROHM Co., Ltd. (BD37034FV) Sound Processor Lineup Category Selector Car Audio BD349x Series BD37033FV BD37034FV BD375xx Series BD37068FV BD346x Series BD34701KS2 BD347x Series Advanced Switching Function (For Reducing Popping Noise) BD381x Series Links with DSP for Car Audio Applications Links with DSP for AV Receivers Key Specifications (Models with Advanced Switching Function) Recommended Application Car Audio Car Audio (DSP Link Enabled) AV Receivers (DSP Link Enabled) RF Noise Pop Noise Input Source Volume (ch) (ch) Reduction Reduction Fader (ch) Part No. Package Operating Voltage (V) BD37033FV SSOP-B28 7.0 to 9.5 2 6 BD37034FV SSOP-B28 VCCL=7.0 to 9.5 VCCH=VCCL to13.0 2 6 BD37534FV SSOP-B28 7.0 to 9.5 2 6 BD37523FS SSOP-A24 7.0 to 9.5 2 5 BD37503FV SSOP-B20 7.0 to 9.5 2 4 BD37068FV SSOP-B40 VCCL=7.0 to 9.5 VCCH=VCCL to 17.0 6 BD3461FS SSOP-A24 7.0 to 9.5 6 BD3465FV SSOP-B20 7.0 to 9.5 4 BD34701KS2 SQFP-T52 ±6.5 to ±7.5 8 BD3473KS2 SQFP-T80C ±6.5 to ±7.5 8 BD3474KS2 SQFP-T80C ±6.5 to ±7.5 6 16th December,2013. .56F6759E 12.2013 Tone Control (Bands) External Input (ch) High Voltage Output