參數(shù)資料
型號(hào)： PCM3003
元件分類： Codec
英文描述： 16-/20-Bit Single-Ended Analog Input/Output STEREO AUDIO CODECs
中文描述： 16-/20-Bit單端模擬輸入/輸出立體聲編解碼器
文件頁(yè)數(shù)： 22/23頁(yè)
文件大小： 206K
代理商： PCM3003
PCM3002/3003
22
EXTERNAL MUTE CONTROL
For Power-Down ON/OFF control without click noise which
is generated by DAC output DC level change, an external
mute control is recommended. The control sequence, which
is external mute ON, CODEC Power-Down ON, SYSCLK
stop and resume if necessary, CODEC Power-down OFF,
and external mute OFF is recommended.
THEORY OF OPERATION
ADC SECTION
The PCM3002/3003 ADC consists of two reference circuits,
a stereo single-to-differential converter, a fully differential
5th-order delta-sigma modulator, a decimation filter (includ-
ing digital high pass), and a serial interface circuit. The
Block Diagram in this data sheet illustrates the architecture
of the ADC section, Figure 1 shows the single-to-differential
converter, and Figure 13 illustrates the architecture of the
5th-order delta-sigma modulator and transfer functions.
An internal reference circuit with three external capacitors
provides all reference voltages which are required by the
ADC, which defines the full scale range for the converter.
The internal single-to-differential voltage converter saves
the space and extra parts needed for external circuitry
required by many delta-sigma converters. The internal full-
differential signal processing architecture provides a wide
dynamic range and excellent power supply rejection perfor-
mance. The input signal is sampled at 64X oversampling
rate, eliminating the need for a sample-and-hold circuit, and
simplifying anti-alias filtering requirements. The 5th-order
delta-sigma noise shaper consists of five integrators which
use a switched-capacitor topology, a comparator and a
feedback loop consisting of a one-bit DAC. The delta-sigma
modulator shapes the quantization noise, shifting it out of
the audio band in the frequency domain. The high order of
the modulator enables it to randomize the modulator out-
puts, reducing idle tone levels.
The 64f
S
one-bit data stream from the modulator is con-
verted to 1f
S
18-bit data words by the decimation filter,
which also acts as a low pass filter to remove the shaped
quantization noise. The DC components are removed by a
high pass filter function contained within the decimation
filter.
THEORY OF OPERATION
DAC SECTION
The delta-sigma DAC section of PCM3002/3003 is based on
a 5-level amplitude quantizer and a 3rd-order noise shaper.
This section converts the oversampled input data to 5-level
delta-sigma format. A block diagram of the 5-level delta-
sigma modulator is shown in Figure 14. This 5-level delta-
sigma modulator has the advantage of improved stability
and reduced clock jitter sensitivity over the typical one-bit
(2 level) delta-sigma modulator. The combined oversampling
rate of the delta-sigma modulator and the internal 8X inter-
polation filter is 64f
S
for a 256fS system clock. The theoreti-
cal quantization noise performance of the 5-level delta-
sigma modulator is shown in Figure 15.
+
+
–
+
+
+
5th SW-CAP
Integrator
4th SW-CAP
Integrator
3rd SW-CAP
Integrator
2nd SW-CAP
Integrator
1st SW-CAP
Integrator
+
+
+
+
–
+
+
–
1-Bit
DAC
H(z)
Qn(z)
Analog In
X(z)
Digital Out
Y(z)
Y(z) = STF(z) X(z) + NTF(z) Qn(z)
Signal Transfer Function
Noise Transfer Function
STF(z) = H(z)/[1 + H(z)]
NTF(z) = 1/[1 + H(z)]
Comparator
FIGURE 13. Simplified 5th-Order Delta-Sigma Modulator.
相關(guān)PDF資料
PDF描述
PCM3003E 16-/20-Bit Single-Ended Analog Input/Output STEREO AUDIO CODECs
PCM3002 16-/20-Bit Single-Ended Analog Input/Output SoundPlus8482，
PCM4104 High-Performance, 24-Bit, 216kHz sampling, Four-channel Audio Digital-to-Analog Converter
PCM4104PFBR High-Performance, 24-Bit, 216kHz sampling, Four-channel Audio Digital-to-Analog Converter
PCM4104PFBT High-Performance, 24-Bit, 216kHz sampling, Four-channel Audio Digital-to-Analog Converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCM-300-324 功能描述:電線鑒定 Pre-Printed WM Card, Vinyl Cloth, .22" W RoHS:否 制造商:TE Connectivity / Q-Cees 產(chǎn)品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長(zhǎng)度:1 in
PCM3003E 功能描述:接口—CODEC 16/20-Bit Sngl-end Anlg I/O Ster Codec RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
PCM3003E 制造商:Texas Instruments 功能描述:IC AUDIO CODEC SMD 3003 SSOP24
PCM3003E/2K 功能描述:接口—CODEC 16/20-Bit Sngl-end Anlg I/O Ster Codec RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
PCM3003E/2KG4 功能描述:接口—CODEC 16/20-Bit Sngl-end Anlg I/O Ster Codec RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*