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參數(shù)資料
| 型號(hào)： | ADS7805U |
| 英文描述： | CMOS Quad 2-Input NOR Gate 14-PDIP -55 to 125 |
| 中文描述： | 16位10ms的采樣CMOS模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大小： | 135K |
| 代理商： | ADS7805U |
ADS7805
11
FIGURE 7. Full Scale Transfer Function.
REFERENCE
The ADS7805 can operate with its internal 2.5V reference or
an external reference. By applying an external reference to
pin 5, the internal reference can be bypassed. The reference
voltage at REF is buffered internally with the output on CAP
(pin 4).
The internal reference has 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).
REF
REF (pin 3) is an input for an external reference or the output
for the internal 2.5V reference. A 2.2
μ
F capacitor should be
connected as close to the REF pin as possible. The 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 degrad-
ing the SNR and SINAD. The REF pin should not be used
to drive external AC or DC loads.
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.
–9.99983V –9.9998V
–10V
Digital
Output
7FFF
Analog
Input
8000
9.999815V
+10V
Ideal Transfer Function
With External Resistors
Range of Transfer Function
Without External Resistors
9.9997V
–50mV
–15mV
CAP
CAP (pin 4) is the output of the internal reference buffer. A
2.2
μ
F capacitor should be placed as close to the CAP pin as
possible to provide optimum switching currents for the
CDAC throughout the conversion cycle and compensation
for the output of the internal buffer. Using a capacitor any
smaller than 1
μ
F can cause the output buffer to oscillate and
may not have sufficient charge for the CDAC. Capacitor
values larger than 2.2
μ
F will have little affect on improving
performance.
The output of the buffer is capable of driving up to 2mA of
current to a DC load. DC loads requiring more than 2mA of
current from the CAP pin will begin to degrade the linearity
of the ADS7805. Using an external buffer will allow the
internal reference to be used for larger DC loads and AC
loads. Do not attempt to directly drive an AC load with the
output voltage on CAP. This will cause performance degra-
dation of the converter.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7805U/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 10us 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 |
| ADS7805U/1KE4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 10us 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 |
| ADS7805U/1KG4 | 功能描述:IC 16BIT 100KHZ SMPL ADC 28-SOIC 制造商:texas instruments 系列:- 包裝:帶卷（TR） 零件狀態(tài):在售 位數(shù):16 采樣率（每秒）:100k 輸入數(shù):1 輸入類型:單端 數(shù)據(jù)接口:并聯(lián) 配置:S/H-ADC 無(wú)線電 - S/H:ADC:1:1 A/D 轉(zhuǎn)換器數(shù):1 架構(gòu):SAR 參考類型:外部， 內(nèi)部 電壓 - 電源，模擬:5V 電壓 - 電源，數(shù)字:5V 特性:- 工作溫度:-25°C ~ 85°C 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商器件封裝:28-SOIC 基本零件編號(hào):ADS7805 標(biāo)準(zhǔn)包裝:1,000 |
| ADS7805UB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 10us 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 |
| ADS7805UB/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 10us 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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