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DSD1792
SLES067B MARCH 2003 REVISED NOVEMBER 2006
www.ti.com
29
APPLICATION INFORMATION
APPLICATION CIRCUIT
The design of the application circuit is very important in order to actually realize the high S/N ratio of which the
DSD1792 is capable. This is because noise and distortion that are generated in an application circuit are not
negligible.
In the circuit of Figure 33, the output level is 2 V rms and 127 dB S/N is achieved.
The circuit of Figure 34 can realize the highest performance. In this case the output level is set to 4.5 V rms
and 129 dB S/N is achieved (stereo mode). In monaural mode, if the output of the L-channel and R-channel
is used as a balanced output, 132 dB S/N is achieved (see Figure 36).
Figure 35 shows a circuit for the DSD mode, which is a 4th-order LPF in order to reduce the out-of-band noise.
I/V Section
The current of the DSD1792 on each of the output pins (IOUTL+, IOUTL–, IOUTR+, IOUTR–) is 7.8 mA p-p at 0
dB (full scale). The voltage output level of the I/V converter (Vi) is given by following equation:
Vi = 7.8 mA p-p
× Rf (Rf : feedback resistance of I/V converter)
An NE5534 operational amplifier is recommended for the I/V circuit to obtain the specified performance.
Dynamic performance such as the gain bandwidth, settling time, and slew rate of the operational amplifier
affects the audio dynamic performance of the I/V section.
Differential Section
The DSD1792 voltage outputs are followed by differential amplifier stages, which sum the differential signals
for each channel, creating a single-ended I/V op-amp output. In addition, the differential amplifiers provide a
low-pass filter function.
The operational amplifier recommended for the IV circuit is the NE5534, and the operational amplifier
recommended for the differential circuit is the Linear Technology LT1028, because their input noise is low.
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DSD1792DBR 功能描述:音频数/模转换器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 转换器数量: 分辨率:16 bit 接口类型:I2S, UBS 转换速率: 信噪比:98 dB 工作电源电压:5 V DAC 输出端数量:2 工作温度范围:- 25 C to + 85 C 电源电流:23 mA 安装风格:SMD/SMT 封装 / 箱体:TQFP-32 封装:Reel
DSD1792DBRG4 功能描述:音频数/模转换器 IC 24B 192kHz Sampl Adv Segment Aud St DAC RoHS:否 制造商:Texas Instruments 转换器数量: 分辨率:16 bit 接口类型:I2S, UBS 转换速率: 信噪比:98 dB 工作电源电压:5 V DAC 输出端数量:2 工作温度范围:- 25 C to + 85 C 电源电流:23 mA 安装风格:SMD/SMT 封装 / 箱体:TQFP-32 封装:Reel
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