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| 型號： | THS1041IPWRG4 |
| 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)： | 22/41頁 |
| 文件大小： | 810K |
| 代理商： | THS1041IPWRG4 |
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THS1041
SLAS289C OCTOBER 2001 REVISED OCTOBER 2004
29
www.ti.com
APPLICATION INFORMATION
C1
8 pF
AVDD
AGND
VCM = AIN+/AIN Common Mode Voltage
AIN
_
+
IIN
R2 = 1/CS fCLK
Figure 43. Equivalent Circuit for the AIN Switched Capacitor Input
AIN input damping
The charging current pulses into AIN+ and AIN can make the signal sources jump or ring, especially if the
sources are slightly inductive at high frequencies. Inserting a small series resistor of 20
or less and a small
capacitor to ground of 20 pF or less in the input path can damp source ringing (see Figure 44). The resistor and
capacitor values can be made larger than 20
and 20 pF if reduced input bandwidth and a slight gain error (due
to potential division between the external resistors and the AIN equivalent resistors) are acceptable.
Note that the capacitors should be soldered to a clean analog ground with a common ground point to prevent
any voltage drops in the ground plane appearing as a differential voltage at the ADC inputs.
AIN
R< 20
VS
C < 20 pF
Figure 44. Damping Source Ringing Using a Small Resistor and Capacitor
driving the VREF pin
Figure 45 shows the equivalent load on the VREF pin when driving the ADC internal references buffer via this
pin (MODE = AVDD/2 or AVDD and REFSENSE = AVDD).
AVDD
AGND
(AVDD + VREF) /4
VREF
RIN
10 k
REFSENSE = AVDD,
MODE = AVDD/2 or AVDD
_
+
MODE = AVDD
Figure 45. Equivalent Circuit of VREF
The nominal input current IREF is given by:
I
REF +
3V
REF *
AV
DD
4
R
IN
(15)
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