參數(shù)資料
型號(hào)： ADS7807PBG4
英文描述： Low-Power, 16-Bit, Sampling CMOS ANALOG-to-DIGITAL CONVERTER
中文描述： 低功耗，16位，采樣CMOS模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 15/24頁(yè)
文件大?。?/td> 534K
代理商： ADS7807PBG4
ADS7807
SBAS022C
15
www.ti.com
tied HIGH will power-down the internal reference reducing
the overall power consumption of the ADS7807 by approxi-
mately 5mW.
The internal reference has approximately an 8ppm/
°
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 ADS7807 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
μ
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.
FIGURE 10. Characteristic Impedances of Internal Buffer.
PWRD 0
REFD 0
PWRD 0
REFD 1
PWRD 1
REFD 0
PWRD 1
REFD 1
Z
CAP
(
)
Z
REF
(
)
1
1
200
200
6k
100M
6k
100M
FIGURE 9. Circuit Diagrams Showing External and Internal Resistors.
CAP
CAP (pin 4) is the output of the internal reference buffer. A
2.2
μ
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
39.8k
200
V
IN
CDAC
(0.3125V to 2.8125V)
+5V
9.9k
100
20k
40k
+2.5V
66.5k
+2.5V
39.8k
200
CDAC
(0.3125V to 2.8125V)
V
IN
9.9k
33.2k
20k
40k
+2.5V
100
+2.5V
39.8k
200
V
IN
CDAC
(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
相關(guān)PDF資料
PDF描述
ADS7807PG4 Low-Power, 16-Bit, Sampling CMOS ANALOG-to-DIGITAL CONVERTER
ADS7808UBE4 12-Bit 10us Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER
ADS7808UBG4 12-Bit 10us Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER
ADS7808UE4 12-Bit 10us Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER
ADS7809PB 16-Bit 10ms Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS7807PG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807U 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807U/1K 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807U/1KE4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807U/1KG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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