參數(shù)資料
型號： THS1041IDWRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
封裝： GREEN, PLASTIC, SOIC-28
文件頁數(shù)： 13/41頁
文件大?。?/td> 777K
代理商： THS1041IDWRG4
THS1041
SLAS289C OCTOBER 2001 REVISED OCTOBER 2004
20
www.ti.com
PRINCIPLES OF OPERATION
onboard reference generator configuration
The internal bandgap reference A1 can provide a supply-voltage-independent and temperature-independent
voltage on pin VREF.
External connections to REFSENSE control A1’s output to the VREF pin as shown in Table 1.
Table 1. Effect of REFSENSE Connection on VREF Value
REFSENSE CONNECTION
A1 OUTPUT TO VREF
REFER TO:
VREF pin
0.5 V
Figure 30
AGND
1 V
Figure 31
External divider junction
(1 + Ra/Rb)/2 V
Figure 32
AVDD
Open circuit
Figure 33
REFSENSE = AVDD powers the internal bandgap reference A1 down, saving power when A1 is not required.
If MODE is connected to AVDD or AVDD/2, then the voltage at VREF determines the ADC reference voltages:
REFT
+
AV
DD
2
) VREF
2
REFB
+
AV
DD
2
* VREF
2
REFT–REFB
+ VREF
_
+
_
+
VBG
ADC
References
Buffer A2
MODE =
REFSENSE
0.1
F 1 F
AGND
VREF = 0.5 V
AVDD
2
or AVDD
Figure 30. 0.5-V VREF Using the Internal Bandgap Reference A1
(10)
(11)
(12)
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THS1041CDW 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
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