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參數(shù)資料
| 型號： | ADC12L034CIWM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold |
| 中文描述： | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數(shù)： | 27/36頁 |
| 文件大小： | 828K |
| 代理商： | ADC12L034CIWM |
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Application Hints
(Continued)
2.1 Biasing for Various Multiplexer Configurations
Figure 11 is an example of biasing the device for
single-ended operation. The sign bit is always low. The digi-
tal output range is 0 0000 0000 0000 to 0 1111 1111 1111.
One LSB is equal to 610 μV (2.5V/4096 LSBs).
For pseudo-differential signed operation the biasing circuit
shown in Figure 12 shows a signal AC coupled to the ADC.
This gives a digital output range of 4096 to +4095. With a
1.25V reference, as shown, 1 LSB is equal to 305 μV. Al-
though the ADC is not production tested with a 1.25V refer-
ence linearity error typically will not change more than 0.3
LSB. With the ADC set to an acquisition time of 10 clock pe-
riods the input biasing resistor needs to be 600
or less. No-
tice though that the input coupling capacitor needs to be
made fairly large to bring down the high pass corner. In-
creasing the acquisition time to 34 clock periods (with a
5 MHz CCLK frequency) would allow the 600
to increase to
6k, which with a 1 μF coupling capacitor would set the high
pass corner at 26 Hz. The value of R1 will depend on the
value of R2.
An alternative method for biasing pseudo-differential opera-
tion is to use the +1.25V from the LM4040 to bias any ampli-
fier circuits driving theADC as shown in Figure 13 The value
of the resistor pull-up biasing the LM4040-2.5 will depend
upon the current required by the op amp biasing circuitry.
Fully differential operation is shown in Figure 14 One LSB
for this case is equal to (2.5V/4096) = 610 mV.
Differential
Configuration
DS011830-40
A/DIN1 and A/DIN2 can be assigned as the + or input
Single-Ended
Configuration
DS011830-41
A/DIN1 is + input
A/DIN2 is input
FIGURE 10.
DS011830-46
FIGURE 11. Single-Ended Biasing
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADC12L034CIWMX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| ADC12L038 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold |
| ADC12L038CIN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Ended Data Acquisition System |
| ADC12L038CIWM | 制造商:Rochester Electronics LLC 功能描述:12BIT +SIGN 3.3V SERIAL A/D - Bulk 制造商:Texas Instruments 功能描述: |
| ADC12L038CIWM/NOPB | 功能描述:IC ADC 12BIT W/S&H +SIGN 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(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
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