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| 型號： | ADAU1401AWBSTZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/52頁 |
| 文件大小： | 0K |
| 描述： | IC AUDIO PROC 28/56BIT 48LQFP |
| 標準包裝： | 1 |
| 系列： | SigmaDSP® |
| 類型： | 音頻處理器 |
| 應用： | 監(jiān)控器，電視 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應商設備封裝： | 48-LQFP（7x7） |
| 包裝： | 托盤 |
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ADAU1401A
Rev. A | Page 20 of 52
AUDIO ADCs
The ADAU1401A has two Σ-Δ ADCs. The signal-to-noise ratio
(SNR) of the ADCs is 100 dB, and the THD + N is 83 dB.
The stereo audio ADCs are current input; therefore, a voltage-
to-current resistor is required on the inputs. This means that
the voltage level of the input signals to the system can be set to
any level; only the input resistors need to be scaled to provide
the proper full-scale current input. The ADC0 and ADC1 input
pins, as well as the ADC_RES pin, have an internal 2 kΩ resistor
for ESD protection. The voltage seen directly on the ADC input
pins is the 1.5 V common-mode voltage.
The external resistor connected to ADC_RES sets the full-scale
current input of the ADCs. The full range of the ADC inputs is
100 μA rms with an external 18 kΩ resistor on ADC_RES (20 kΩ
total, because it is in series with the internal 2 kΩ). The only
reason to change the ADC_RES resistor is if a sampling rate
other than 48 kHz is used.
The voltage-to-current resistors connected to ADC0 and ADC1 set
the full-scale voltage input of the ADCs. With a full-scale current
input of 100 μA rms, a 2.0 V rms signal with an external 18 kΩ
resistor (in series with the 2 kΩ internal resistor) results in an
input using the full range of the ADC. The matching of these
resistors to the ADC_RES resistor is important to the operation of
the ADCs. For these three resistors, a 1% tolerance is recommended.
The ADC0 input pin and/or the ADC1 input pin can be left
unconnected if the corresponding channel of the ADC is unused.
The calculations of resistor values assume a 48 kHz sample rate.
The recommended input and current setting resistors scale linearly
with the sample rate because the ADCs have a switched-capacitor
input. The total value (2 kΩ internal plus external resistor) of the
ADC_RES resistor with sample rate fS_NEW can be calculated as
follows:
NEW
S
TOTAL
f
R
_
000
,
48
kΩ
20
×
=
The values of the resistors (internal plus external) in series with
the ADC0 and ADC1 pins can be calculated as follows:
NEW
S
TOTAL
INPUT
f
Voltage
Input
rms
R
_
000
,
48
kΩ
10
)
(
×
=
Table 14 lists the external and total resistor values for common
signal input levels at a 48 kHz sampling rate. A full-scale rms
input voltage of 0.9 V is shown in the table because a full-scale
signal at this input level is equal to a full-scale output on the DACs.
Table 14. ADC Input Resistor Values
Full-Scale
RMS Input
Voltage (V)
ADC_RES
Value (kΩ)
ADC0/ADC1
Resistor
Value (kΩ)
Total ADC0/ADC1
Input Resistance
(External +
Internal) (kΩ)
0.9
18
7
9
1.0
18
8
10
2.0
18
20
Figure 17 shows a typical configuration of the ADC inputs for
a 2.0 V rms input signal for a fS of 48 kHz. The 47 μF capacitors are
used to ac-couple the signals so that the inputs are biased at 1.5 V.
ADC1
ADC0
ADC_RES
18k
47F
18k
47F
18k
ADAU1401A
08
50
6-
0
17
Figure 17. Audio ADC Input Configuration
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADAU1401AWBSTZ-RL | 功能描述:IC AUDIO PROC 28/56BIT 48LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:SigmaDSP® 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| ADAU1401YSTZ | 功能描述:IC AUDIO PROC 28/56BIT 48LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:SigmaDSP® 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| ADAU1401YSTZ-RL | 功能描述:IC AUDIO PROC 28/56BIT 48LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:SigmaDSP® 其它有關文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應商設備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| ADAU1421YSTZ | 制造商:Analog Devices 功能描述: |
| ADAU1421YSTZ-REEL | 制造商:Analog Devices 功能描述: |
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