BD34352EKV
32-bit, 768 kHz Sampling Stereo Audio D/A Converter

BD34352EKV is 32-bit high sound quality stereo audio D/A converter with ROHM original sound quality design, realizing excellent numerical performance (SNR: 126 dB(Typ), THD+N: -112 dB(Typ)) suitable for high-end audio. Favorite sound is selectable by switching 2 kinds of digital FIR filters (Sharp Roll-Off, Slow Roll-Off). PCM I/F supports up to 768kHz and DSD I/F supports up to 22.4MHz.

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Product Detail

 
Part Number | BD34352EKV-E2
Status | Recommended
Package | HTQFP64BV
Unit Quantity | 1000
Minimum Package Quantity | 1000
Packing Type | Taping
RoHS | Yes

Specifications:

Sampling Rate (Max.) [kHz]

768

Resolution (Max.) [bit]

32

DAC channels

2

Input Types

I2S DSD

Output Types

Line

SNR (Typ.) [dB]

126

THD+N (Typ.) [dB]

-112

Dynamic Range (Typ.) [dB]

126

DSD Clock (Max.) [MHz]

22.4

Supply Voltage Range of AVCC [V]

4.5 to 5.5

Supply Voltage Range of DVDD [V]

1.4 to 1.6

Supply Voltage Range of DVDDIO [V]

3.0 to 3.6

I/F

2-wire

Operating Temperature (Min.)[°C]

-25

Operating Temperature (Max.)[°C]

85

Package Size [mm]

12x12 (t=1)

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Features:

  • SNR 126dB(Typ), THD+N -112dB (Typ)(PCM mode)
  • Sampling Frequency 32kHz to 768kHz (PCM mode)
  • 2 Kinds of Digital FIR Filters (PCM mode)
  • DSD 2.8MHz, 5.6MHz, 11.2MHz, 22.4MHz Available
  • Supports Stereo Mode (2ch) and Mono Mode(1ch)
  • Selectable 4 Device Addresses (38h, 3Ah, 3Ch, 3Eh)

Supporting Information

 

Background

Designed to maximally extract and convert high resolution digital audio data to analog audio signals, audio DAC chips are one of the most important components for determining the quality in audio equipment.
Leveraging 50 years of expertise in developing audio ICs allowed ROHM to establish ‘sound quality design technology’ – capable of extracting the full amount of information from sound sources and offer products that deliver superior sound quality, including sound processor and power management ICs.

Overview

The new DAC chip BD34352EKV is specially tuned to powerfully express the energy of sound sources while maintaining the natural flat sound characteristics of ROHM’s DAC chips design concept. At the same time, an advanced digital filter is included - the same as for BD34301EKV. That leads to superior numerical performance (S/N ratio: 126dB, THD+N: -112dB) of the DAC chip, making it ideal for high-end audio equipment. In addition, the BD34352EKV features pin compatibility with the BD34301EKV. It has the same customizable filter as the BD34301EKV. This enables different sound quality tunings for each audio device – reducing development load while contributing to the creation of ideal sound sought by audio manufacturers.

Key Features

Developed as a DAC chip for high-end audio equipment, the BD34352EKV not only maintains the natural flat sound characteristics of ROHM’s DAC chips design concept. It is also specially tuned to express the energy of sound sources more powerfully than the BD34301EKV, which emphasizes quietness and spatial reverberation.
To achieve the desired sound, the BD34352EKV provides the following features by leveraging sound quality design technology cultivated from identifying 28 parameters related to sound quality.

1. Achieves the demanded numerical and sound quality performance of DAC chips for high-end models

The BD34352EKV achieves excellent numerical performance (S/N ratio: 126dB, THD+N: -112dB) while also improving sound quality in ways that cannot be defined by simple numerical values. For example, in the D/A conversion circuit consisting of current segments, the output current has been adjusted by adopting circuit technology used in the BD34301EKV. At the same time, the digital filter (FIR filter), a key function of the digital signal processing circuit, is designed to faithfully process even the smallest signals by achieving a rejection band attenuation of -150dB or less (a performance indicator of digital filters). This makes it possible to extract the full range of information from sound sources. It provides sound quality characteristics that allow listeners to hear more powerful, natural flat sound.

BD34352EKV Circuit Block Diagram and Features

Input Levels vs THD+N Characteristics
Digital Filter Frequency Response Graph

2.Customizable digital filter allows designers to tailor the sound to audio equipment

The BD34352EKV enables customization of the digital filter (FIR filter) in the digital signal processing circuit which affects sound quality. Preset, custom, or external settings can be selected. Even the filter’s calculation coefficients and oversampling rate can be programmatically customized. As a result, it not only features pin compatibility but also has the same customizable filter as the BD34301EKV. That allows to achieve different sound quality tunings for each device. Overall, this reduces development load while contributing to the creation of ideal sound sought by audio manufacturers.

Built-In Customizable Digital Filters

Evaluation
Board

 
    • Evaluation Board
    • BD34352EKV-EVK-001
    • BD34352EKV is 32-bit high sound quality stereo audio D/A converter with ROHM original sound quality design, realizing excellent numerical performance (SNR: 126 dB(Typ), THD+N: -112 dB(Typ)) suitable for high-end audio. Favorite sound is selectable by switching 2 kinds of digital FIR filters (Sharp Roll-Off, Slow Roll-Off). PCM I/F supports up to 768kHz and DSD I/F supports up to 22.4MHz.

  • User's Guide Buy