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參數資料
| 型號： | ADS7806PB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PDIP28 |
| 封裝： | 0.300 INCH, GREEN, PLASTIC, DIP-28 |
| 文件頁數： | 7/25頁 |
| 文件大小： | 670K |
| 代理商： | ADS7806PB |
ADS7806
15
SBAS021B
www.ti.com
CAP
CAP (pin 4) is the output of the internal reference buffer. A
2.2
F tantalum capacitor should be placed as close as
possible to the CAP pin from ground to provide optimum
switching currents for the CDAC throughout the conversion
FIGURE 10. Characteristic Impedances of Internal Buffer.
PWRD 0
PWRD 1
REFD 0
REFD 1
REFD 0
REFD 1
Z
CAP ()
1
200
Z
REF ()
6k
100M
6k
100M
FIGURE 9. Circuit Diagrams Showing External and Internal Resistors.
tied HIGH will power-down the internal reference reducing
the overall power consumption of the ADS7806 by approxi-
mately 5mW.
The internal reference has approximately an 8 ppm/
°C drift
(typical) and accounts for approximately 20% of the full-scale
error (FSE =
±0.5% for low grade, ±0.25% for high grade).
The ADS7806 also has an internal buffer for the reference
voltage. Figure 10 shows characteristic impedances at the
input and output of the buffer with all combinations of power-
down and reference down.
REF
REF (pin 5) is an input for an external reference or the output
for the internal 2.5V reference. A 2.2
F tantalum capacitor
should be connected as close as possible to the REF pin
from ground. This capacitor and the output resistance of REF
create a low-pass filter to bandlimit noise on the reference.
Using a smaller value capacitor will introduce more noise to
the reference, degrading the SNR and SINAD. The REF pin
should not be used to drive external AC or DC loads, as
shown in Figure 10.
The range for the external reference is 2.3V to 2.7V and
determines the actual LSB size. Increasing the reference
voltage will increase the full-scale range and the LSB size of
the converter which can improve the SNR.
39.8k
200
V
IN
CDAC (High Impedance)
(0.3125V to 2.8125V)
+5V
9.9k
100
20k
40k
+2.5V
66.5k
+2.5V
39.8k
200
CDAC (High Impedance)
(0.3125V to 2.8125V)
V
IN
9.9k
33.2k
20k
40k
+2.5V
100
+2.5V
39.8k
200
V
IN
CDAC (High Impedance)
(0.3125V to 2.8125V)
9.9k
33.2k
20k
40k
+2.5V
100
+2.5V
CDAC
CAP
(Pin 4)
Z
CAP
Buffer
Internal
Reference
REF
(Pin 5)
Z
REF
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADS7806PBG4 | 功能描述:模數轉換器 - ADC Low-Power 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數量: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 |
| ADS7806PG4 | 功能描述:模數轉換器 - ADC Low-Power 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數量: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 |
| ADS7806U | 功能描述:模數轉換器 - ADC Low-Power 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數量: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 |
| ADS7806U | 制造商:Texas Instruments 功能描述:12BIT ADC LOW POWER SERIAL 7806 |
| ADS7806U/1K | 功能描述:模數轉換器 - ADC Low-Power 12-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數量: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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