參數(shù)資料
型號: THS1040CDWR
廠商: Texas Instruments, Inc.
英文描述: LABELS,CABLE MARKERS,CABLE MARKERS,LABELS, CABLE MARKERS,WIRE IDENTIFICATION AND MARKING SYSTEMS,SCOTCHCODE? WIRE MARKER TAPE REFILLS RoHS Compliant: Yes
中文描述: 3伏,10位,40 MSPS的CMOS模擬數(shù)字轉(zhuǎn)換器
文件頁數(shù): 19/32頁
文件大?。?/td> 545K
代理商: THS1040CDWR
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
Open circuit
Figure 27
AVDD
Figure 28
REFSENSE = AV
DD
powers the internal bandgap reference A1 down, saving power when A1 is not required.
If MODE is connected to AV
DD
or AV
DD
/2, then the voltage at VREF determines the ADC reference voltages:
AVDD
2
2
REFT
VREF
REFB
AVDD
2
VREF
2
REFT–REFB
VREF
_
+
_
+
VBG
ADC
References
Buffer A2
MODE =
AVDD
2
REFSENSE
0.1
μ
F
1
μ
F
AGND
VREF = 0.5 V
or AVDD
Figure 25. 0.5-V VREF Using the Internal Bandgap Reference A1
(9)
(10)
(11)
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PDF描述
THS1040CPWR TAPE,SCOTCHCODE? WIRE MARKER TAPE REFILLS FOR WIRE MARKER TAPE DISPENSER,TAPE,SCOTCHCODE SDR WIRE MARKER TAPE REFILL A" RoHS Compliant: Yes
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