參數(shù)資料
型號： CDB4270
廠商： Cirrus Logic, Inc.
元件分類： Codec
英文描述： 24-Bit, 192 kHz Stereo Audio CODEC
中文描述： 24位192千赫立體聲音頻CODEC
文件頁數(shù)： 28/48頁
文件大小： 730K
代理商： CDB4270
28
DS686A1
CS4270
5.4
Analog Connections
5.4.1 Input Connections
The analog modulator samples the input at 6.144 MHz.The digital filter will reject signals within the stopband of the
filter. However, there is no rejection for input signals which are multiples of the input sampling frequency
(n
×
6.144 MHz), where n=0,1,2,... Refer to
Figure 12
which shows the recommended topology of the analog input
network. The capacitor values chosen not only provide the appropriate filtering of noise at the modulator sampling
frequency, but also act as a charge source for the internal sampling circuits. The use of capacitors which have a
large voltage coefficient (such as general purpose ceramics) must be avoided since these can degrade signal lin-
earity.
Three parameters determine the values of resistors R1 and R2 as shown in
Figure 12
: source impedance,
attenuation, and input impedance. Source impedance is defined as the impedance as seen from the ADC
looking back into the signal network. Analog performance is optimized for small source impedance and a
source impedance above 2.5 k
results in degraded THD+N.
The required attenuation factor depends on the magnitude of the input signal. The full-scale input voltage
scales with VA; for VA = 5 V, the CS5344 full-scale input magnitude is 1 Vrms. R1 and R2 should be set
such that an input signal greater than the full-scale input should be attenuated to the appropriate magni-
tude. Typical line-level voltage in audio applications is 2 Vrms, in which case R1 and R2 must combine to
form an attenuation factor of 2, thus giving the CS5344 a 1 Vrms input.
Input impedance is the impedance from the signal source to the ADC analog input pins. The target input
impedance depends on the overall system specifications, but typical audio systems require an input im-
pedance of 10 k
.
Table 6
shows the input parameters and the associated design equations.
Figure 13
illustrates an example configuration for a source impedance of 46
, an attenuation factor of 1, and input
impedance of 9.8 k
.
Source Impedance
Attenuation Factor
Input Impedance
Table 6. Analog Input Design Parameters
Figure 12. CS4270 Recommended Analog Input Network
CS4270
AINx
2200 pF
R2
10
μ
F
R1
Analog
Input
1
R
1
R
2
R
2
×
+
-R
)
2
×
R
1
R
2
-----R
R
1
R
2
+
(
)
相關(guān)PDF資料
PDF描述
CDB4271 24-Bit, 192 kHz Stereo Audio CODEC
CDB4272 24-Bit, 192 kHz Stereo Audio CODEC
CDB42L51 Silver Mica Capacitor; Capacitance:120pF; Capacitance Tolerance:+/- 5%; Series:CDV16; Voltage Rating:1000VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:5.94mm; Leaded Process Compatible:Yes RoHS Compliant: Yes
CDB42L50 Silver Mica Capacitor; Capacitance:100pF; Capacitance Tolerance:+/- 5%; Series:CDS; Voltage Rating:300VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:3mm; Leaded Process Compatible:No RoHS Compliant: No
CDB43122 122dB, 24-Bit, 192kHz DAC for Digital Audio
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CDB4271 功能描述:音頻 IC 開發(fā)工具 Eval Bd CS4271 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
CDB4272 功能描述:音頻 IC 開發(fā)工具 Eval Bd CS4272 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
CDB4299 功能描述:音頻 IC 開發(fā)工具 Eval Bd AC’97 CODEC w/SRC RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
CDB42L50 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:Low Voltage, Stereo CODEC with headphone Amp
CDB42L51 功能描述:音頻 IC 開發(fā)工具 Eval Bd Low-volt CODEC RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
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