參數(shù)資料
型號(hào): THS1040CPW
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, TSSOP-28
文件頁數(shù): 11/36頁
文件大?。?/td> 751K
代理商: THS1040CPW
THS1040
SLAS290C OCTOBER 2001 REVISED OCTOBER 2004
19
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
SEE:
VREF pin
0.5 V
Figure 25
AGND
1 V
Figure 26
External divider junction
(1 + Ra/Rb)/2 V
Figure 27
AVDD
Open circuit
Figure 28
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 25. 0.5-V VREF Using the Internal Bandgap Reference A1
(9)
(10)
(11)
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