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参数资料
| 型号： | PCM1737E |
| 英文描述： | 24-Bit, 192kHz Sampling Enhanced Multi-Level, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 24位192kHz采样增强的多级，Δ-Σ，音频数字模拟转换器 |
| 文件页数： | 15/27页 |
| 文件大小： | 180K |
| 代理商： | PCM1737E |
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PCM1737
FIGURE 11. Output Filter Frequency Response.
ANALOG OUTPUTS
The PCM1737 includes two independent output channels:
VOUTL and VOUTR. These are unbalanced outputs, each
capable of driving 3.1Vp-p typical into a 5k
AC-coupled
load (VCC = +5V). The internal output amplifiers for VOUTL
and VOUTR are DC biased to a DC common-mode (or
bipolar zero) voltage, equal to VCC/2.
The output amplifiers include an RC continuous-time filter,
which helps to reduce the out-of-band noise energy present
at the DAC outputs due to the noise shaping characteristics
of the PCM1737’s delta-sigma D/A converters. The fre-
quency response of this filter is shown in Figure 11. By
itself, this filter is not enough to attenuate the out-of-band
noise to an acceptable level for most applications. An
external low-pass filter is required to provide sufficient out-
of-band noise rejection. Further discussion of DAC post-
filter circuits is provided in the Applications Information
section of this data sheet.
VCOML AND VCOMR OUTPUTS
Two unbuffered common-mode voltage output pins, VCOML
(pin 17) and VCOMR (pin 12), are brought out for decoupling
purposes. These pins are nominally biased to a DC voltage
level equal to VCC/2. These pins may be used to bias external
circuits, a voltage follower is required for buffering pur-
poses. Figure 12 shows an example of using the VCOML and
VCOMR pins for external biasing applications.
ZERO FLAG AND INFINITE ZERO DETECT MUTE
FUNCTIONS
The PCM1737 includes circuitry for detecting an all ‘0’ data
condition for the data input pin, DATA. This includes two
independent functions: Zero Output Flags and Zero Detect
Mute. Although the flag and mute functions are independent
of one another, the zero detection mechanism is common to
both functions.
Zero Detect Condition
Zero Detection for each output channel is independent from
the other. If the data for a given channel remains at a ‘0’
level for 1024 sample periods (or LRCK clock periods), a
Zero Detect condition exists for that channel.
Zero Output Flags
Given that a Zero Detect condition exists for one or more
channels, the Zero flag pins for those channels will be set to
a logic ‘1’state. There are Zero Flag pins for each channel,
ZEROL (pin 23) and ZEROR (pin 24). These pins can be
used to operate external mute circuits, or used as status
indicators for a microcontroller, audio signal processor, or
other digitally-controlled functions.
Infinite Zero Detect Mute
Infinite Zero Detect Mute is an internal logic function. The
Zero Detect Mute can be enabled or disabled using the INZD
bit of Control Register 18. The reset default is Zero Detect
Mute disabled, INZD = 0. Given that a Zero Detect Condi-
tion exists for one or more channels, the zero mute circuitry
will immediately force the corresponding DAC output(s) to
the bipolar zero level, or VCC/2.
100
1k
10k
ANALOG FILTER RESPONSE
100k
10M
1M
10
0
–10
–20
–30
–40
–50
–60
Level
(dB)
Frequency (Hz)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCM1737E/2K | 功能描述:音频数/模转换器 IC 24-Bit 192kHz Smplg Enh Mltl D-S 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 |
| PCM1737E/2KG4 | 功能描述:音频数/模转换器 IC 24-Bit 192kHz Smplg Enh Mltl D-S 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 |
| PCM1737E-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| PCM1737EG4 | 功能描述:音频数/模转换器 IC 24-Bit 192kHz Smplg Enh Mltl D-S 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 |
| PCM1738 | 制造商:BB 制造商全称:BB 功能描述:24-Bit, 192kHz Sampling, Advanced Segment, Audio-Stereo DIGITAL-TO-ANALOG CONVERTER |
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