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參數資料
| 型號： | EVAL-ADAU1401EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 14/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADAU1401 |
| 標準包裝： | 1 |
| 系列： | SigmaDSP® |
| 主要目的： | 音頻編解碼器 |
| 嵌入式： | 是，DSP |
| 已用 IC / 零件： | ADAU1401 |
| 主要屬性： | 在 50-MIPS 時的 28/56 位音頻處理器，2 ADC，4 DAC |
| 次要屬性： | 均衡，交叉，低音增強，多頻帶動態(tài)處理，延遲等 |
| 已供物品： | 2 個板，線纜，電源 |
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Data Sheet
ADAU1401
Rev. C | Page 21 of 52
AUDIO ADCs
The ADAU1401 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 ADC_RES, 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.
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/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.
Either the ADC0 and/or ADC1 input pins can be left
unconnected if that channel of the ADC is unused.
These 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
ADAU1401
06
75
2-
0
17
Figure 17. Audio ADC Input Configuration
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| EVAL-ADAU1401-EBZ | 制造商:Analog Devices 功能描述:EVALUATION KIT ((NS)) |
| EVAL-ADAU1442EBZ | 功能描述:BOARD EVAL FOR ADAU1442 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:SigmaDSP® 標準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
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| EVAL-ADAU1590EBZ | 制造商:Analog Devices 功能描述:EVAL BOARD - Bulk |
| EVAL-ADAU1592EBZ | 制造商:Analog Devices 功能描述:Evaluation Board For ADAU1592 制造商:Analog Devices 功能描述:EVAL BOARD - Boxed Product (Development Kits) |
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