參數(shù)資料
型號(hào)： PCM1794ADBRG4
英文描述： 24-bit,192-khz sampling,advanced segment, audio stereo digital-to-analog converter
中文描述： 24位,192 - kHz的采樣，先進(jìn)的部分，立體聲音頻數(shù)字模擬轉(zhuǎn)換器
文件頁(yè)數(shù)： 19/30頁(yè)
文件大?。?/td> 301K
代理商： PCM1794ADBRG4
SLES117A – AUGUST 2004 – REVISED NOVEMBER 2006
www.ti.com
19
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
PCM1794A is capable. This is because noise and distortion that are generated in an application circuit are not
negligible.
In the circuit of Figure 24, the output level is 2 V RMS, and 127 dB S/N is achieved. The circuit of Figure 25 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 26).
I/V Section
The current of the PCM1794A on each of the output pins (I
OUT
L+, I
OUT
L–, I
OUT
R+, I
OUT
R–) 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
×
R
f
(R
f
: 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 PCM1794A 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 differential circuit is the Linear Technology LT1028, because its input
noise is low.
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PDF描述
PCM1794ADBG4 24-bit,192-khz sampling,advanced segment, audio stereo digital-to-analog converter
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PCM1796 24BIT 192 KHZ SAMPLING ADVANCED SEGMENT AUDIO STEREO DIGITAL TO ANALOG CONVERTER
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCM1794AQDBRQ1 功能描述:DAC, Audio 24 bit 192k I2S, PCM 28-SSOP 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類(lèi)型:DAC，音頻 分辨率（位）:24 b 采樣率（每秒）:192k 數(shù)據(jù)接口:I2S，PCM 電壓源:模擬和數(shù)字 電壓 - 電源:3 V ~ 3.6 V，5V 工作溫度:-25°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商器件封裝:28-SSOP 標(biāo)準(zhǔn)包裝:1
PCM1794DB 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類(lèi)型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel
PCM1794DB 制造商:Texas Instruments 功能描述:24BIT AUDIO DAC SMD 1794 SSOP28
PCM1794DBG4 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類(lèi)型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel
PCM1794DBR 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC 24-Bit 192kHz Smplng Adv Stg Stereo DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類(lèi)型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel
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