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參數(shù)資料
| 型號： | ADC12138 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 串行ADC |
| 英文描述： | Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold |
| 中文描述： | 自校準12位帶符號串行I /辦公自動化/ D轉換器MUX和采樣/保持 |
| 文件頁數(shù)： | 30/41頁 |
| 文件大?。?/td> | 1085K |
| 代理商： | ADC12138 |
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Application Hints
(Continued)
The Multiplexer assignment tables for the ADC12130/2/8
(Table 2 and Table 3) summarize the aforementioned func-
tions for the different versions of A/Ds.
2.1 Biasing for Various Multiplexer Configurations
Figure 11 is an example of biasing the device for
single-ended operation. The sign bit is always low. The digi-
tal output range is 0 0000 0000 0000 to 0 1111 1111 1111.
One LSB is equal to 1 mV (4.1V/4096 LSBs).
For pseudo-differential signed operation, the biasing circuit
shown in Figure 12 shows a signal AC coupled to the ADC.
This gives a digital output range of 4096 to +4095. With a
2.5V reference, as shown, 1 LSB is equal to 610 μV. Al-
though, the ADC is not production tested with a 2.5V refer-
ence, when V
A+
and V
D+
are +5.0V linearity error typically
will not change more than 0.1 LSB (see the curves in the
Typical Electrical Characteristics Section). With the ADC set
to an acquisition time of 10 clock periods, the input biasing
resistor needs to be 600
or less. Notice though that the in-
put coupling capacitor needs to be made fairly large to bring
down the high pass corner. Increasing the acquisition time to
34 clock periods (with a 5 MHz CCLK frequency) would al-
low the 600
to increase to 6k, which with a 1 μF coupling
capacitor would set the high pass corner at 26 Hz. Increas-
ing R, to 6k would allow R
2
to be 2k.
DS012079-38
FIGURE 11. Single-Ended Biasing
A
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADC12138CIMSA | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC12138CIMSA/NOPB | 功能描述:模數(shù)轉換器 - ADC SELF-CALIBR 12B PLUS SIGN SERIAL I/O ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC12138CIMSANOPB | 制造商:TI 功能描述:Pb Free |
| ADC12138CIMSAX | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC12138CIMSAX/NOPB | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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