- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄364640 > ADS7810 12-Bit 800kHz Sampling CMOS ANALOG-to-DIGITAL CONVERTER PDF資料下載
參數(shù)資料
| 型號(hào)： | ADS7810 |
| 英文描述： | 12-Bit 800kHz Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| 中文描述： | 12位800kHz采樣CMOS模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 10/11頁(yè) |
| 文件大小： | 208K |
| 代理商： | ADS7810 |
ADS7810
10
CALIBRATION
The ADS7810 can be trimmed in hardware or software. The
offset should be trimmed before the gain since the offset
directly affects the gain.
Hardware Calibration
To calibrate the offset and gain of the ADS7810, install the
proper resistors and potentiometers as shown in Figure 4a.
The calibration range is
±
50mV for bipolar zero and
±
120mV
for full scale.
Potentiometer P
1
and resistor R
1
form the offset adjust
circuit and P
2
and R
2
the gain adjust circuit. The exact values
are not critical. R
1
and R
2
should not be made any larger than
the value shown. They can easily be made smaller to provide
increased adjustment range. Reducing these below 15% of
the indicated values could begin to adversely affect the
operation of the converter.
P
1
and P
2
can also be made larger to reduce power dissipa-
tion. However, larger resistances will push the useful adjust-
ment range to the edges of the potentiometer. P
1
should
probably not exceed 20k
and P2 100k
in order to main-
tain reasonable sensitivity.
Software Calibration
To calibrate the offset and gain of the ADS7810, no external
resistors are required. See the
No Calibration
section for
details on the effects of the external resistor.
No Calibration
See Figure 4b for circuit connections. Note that the actual
voltage dropped across the 50
resistor is nearly two orders
of magnitude lower than the voltage dropped across the
internal resistor divider network. This should be taken into
consideration when choosing the accuracy and drift specifi-
cations of the external resistors. In most applications, 1%
metal-film resistors will be sufficient.
The external 50
resistor shown in Figure 4b may not be
necessary in some applications. This resistor provides trim
capability for the offset and compensates for a slight gain
adjustment internal to the ADS7810. Not using the 50
resistor will cause a small gain error but will have no effect
on the inherent offset error. Figure 5 shows typical transfer
function characteristics with and without the 50
resistor in
the circuit.
REFERENCE
The ADS7810 can operate with its internal 2.5V reference or an
external reference. By applying an external reference to pin 3,
the internal reference can be bypassed. The reference voltage at
REF is buffered internally and output on CAP (pin 4).
REF
REF (pin 3) is an input for an external reference or the
output for the internal 2.5V reference. A 0.1
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 band limit noise on the reference. Using a smaller
value capacitor will introduce more noise to the reference
degrading the SNR and SINAD. The internal reference
should not be used to sink or source currents greater than
100
μ
A. In addition, all external loads should be static.
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 5. Comparison of the ADS7810 Transfer Function With and Without the 50
Series Resistor on V
IN
.
–9.84V
–10.0V
Digital
Output
+ Full Scale
Analog
Input
– Full Scale
Typical Transfer Function
with 50
Resistor
Typical Transfer Function
without 50
Resistor
9.84V
10.0V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7810U | CMOS Quad 2-Input NOR Gate 14-CDIP -55 to 125 |
| ADS7810UB | CMOS Quad 2-Input NOR Gate 14-CDIP -55 to 125 |
| ADS7811 | 16-Bit 250kHz Sampling CMOS ANALOG-to-DIGITAL CONVERTER |
| ADS7811U | CMOS Quad 2-Input NOR Gate 14-PDIP -55 to 125 |
| ADS7812 | Low-Power, Serial 12-Bit Sampling ANALOG-TO-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7810U | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 800kHz 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 |
| ADS7810U/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 800kHz 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 |
| ADS7810U/1KE4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 800kHz 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 |
| ADS7810U/1KG4 | 功能描述:IC 12BIT 800KHZ SMPL ADC 28SOIC 制造商:texas instruments 系列:- 包裝:帶卷（TR） 零件狀態(tài):停產(chǎn) 位數(shù):12 采樣率（每秒）:800k 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:-40°C ~ 70°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):ADS7810 標(biāo)準(zhǔn)包裝:1,000 |
| ADS7810U-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。