參數(shù)資料
型號(hào): THS1030CPWR
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(yè)數(shù): 19/37頁(yè)
文件大?。?/td> 727K
代理商: THS1030CPWR
THS1030
3V TO 5.5V, 10BIT, 30 MSPS
CMOS ANALOGTODIGITAL CONVERTER
SLAS243E NOVEMBER 1999 REVISED DECEMBER 2003
26
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
details (continued)
The ac input resistance RAIN is then
RAIN = dIin / dVin
= 1 / (dVin / dIin)
= 1 / (CS x fclk)
driving the VREF pin (differential mode)
Figure 30 shows the equivalent load on the VREF pin when driving the internal reference buffer via this pin
(MODE = AVDD/2 and REFSENSE = AVDD).
AVDD
AGND
AVDD + VREF
VREF
RIN
14 k
REFSENSE = AVDD,
Mode = AVDD
_
+
2
4
Figure 30. Equivalent Circuit of VREF
The current flowing into IIN is given by
I
IN +
3
VREF
* AV
DD
4
R
IN
Note that the actual IIN may differ from this value by up to ±50% due to device-to-device processing variations
and allowing for operating temperature variations.
The user should ensure that VREF is driven from a low noise, low drift source, well-decoupled to analog ground
and capable of driving IIN.
(11)
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