參數(shù)資料
型號(hào)： 5962-0051901NXD
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： ADC
英文描述： 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32
封裝： PLASTIC, TSSOP-32
文件頁(yè)數(shù)： 20/42頁(yè)
文件大小： 840K
代理商： 5962-0051901NXD
THS12082
12-BIT, 8 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTERS
SLAS271B – MAY 2000 – REVISED DECEMBER 2002
27
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
analog input configuration and reference voltage (continued)
A differential operation is desired for many applications. Figure 16 shows a simplified model for the analog
inputs AINM and AINP, which are configured for differential operation. This configuration has a few advantages,
which are discussed in the following paragraphs.
12-Bit
ADC
VREFP
VREFM
AINP
Σ
VADC
AINM
+
–
Figure 16. Differential Input Stage
In comparison to the single-ended configuration it can be seen that the voltage, VADC, which is applied at the
input of the ADC, is the difference between the input AINP and AINM. This means that VREFM defines the
minimum voltage (VADC), which can be applied to the ADC. VREFP defines the maximum voltage (VADC), which
can be applied to the ADC. The voltage VADC can be calculated as follows:
V
ADC +
ABS(AINP–AINM)
An advantage to single-ended operation is that the common-mode voltage
V
CM +
AINM
) AINP
2
can be rejected in the differential configuration, if the following condition for the analog input voltages is true:
AGND
v AINM, AINP v AV
DD
1V
v V
CM v
4V
In addition to the common-mode voltage rejection, the differential operation allows a dc-offset rejection, which
is common to both analog inputs. See also Figure 18.
single-ended mode of operation
The THS12082 can be configured for single-ended operation using dc or ac coupling. In either case, the input
of the THS12082 must be driven from an operational amplifier that does not degrade the ADC performance.
Because the THS12082 operates from a 5-V single supply, it is necessary to level-shift ground-based bipolar
signals to comply with its input requirements. This can be achieved with dc- and ac-coupling. An application
example is shown for dc-coupled level shifting in the following section, dc-coupling.
(2)
(3)
(4)
(5)
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5962-0052201HXA 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter
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5962-0052201HYA 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter
5962-0052201HYC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter
5962-0052201HZA 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC to DC Converter
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