- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄364640 > ADS7810UB CMOS Quad 2-Input NOR Gate 14-CDIP -55 to 125 PDF資料下載
參數(shù)資料
| 型號： | ADS7810UB |
| 英文描述： | CMOS Quad 2-Input NOR Gate 14-CDIP -55 to 125 |
| 中文描述： | 12位800kHz采樣CMOS模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 208K |
| 代理商： | ADS7810UB |
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 |
|---|---|
| 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 |
| ADS7812P | Low-Power, Serial 12-Bit Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS7812PB | 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 |
|---|---|
| ADS7810UB | 制造商:Texas Instruments 功能描述:12BIT ADC 800KHZ CMOS SMD SOIC28 |
| ADS7810UB/1K | 功能描述:IC 12-BIT 800KHZ SMPL A/D 28SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| ADS7810UB/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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7810UB-1 | 制造商:Texas Instruments 功能描述: |
| ADS7810UBE4 | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
發(fā)布緊急采購，3分鐘左右您將得到回復。