參數(shù)資料
型號(hào)： THS1215IPWR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： ADC
英文描述： 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
封裝： GREEN, PLASTIC, TSSOP-28
文件頁(yè)數(shù)： 5/22頁(yè)
文件大小： 391K
代理商： THS1215IPWR
www.ti.com
THS1215
RS
VS+
VS
RS
RSW
CI
VCM
_
+
_
+
R
S t
1
2f
CLK
C
I
In(256)
–R
SW
VIN+
VIN
R1
R2
+
R1
R2
+
C1
C2
THS1215
AIN+
AIN
REFT
REFB
AVDD
2
THS1215
SLAS292A – MARCH 2001 – REVISED MARCH 2004
Figure 16. Simplified Equivalent Input Circuit
To maintain the frequency performance outlined in the specifications, the total source impedance should be
limited to the following equation with fCLK = 15 MHz, CI = 5 pF, RSW = 200 :
So, for applications running at a lower fCLK, the total source resistance can increase proportionally.
The analog input of the THS1215 is a differential input that can be configured in various ways depending on the
signal source and the required level of performance. A fully differential connection (see Figure 17) delivers the
best performance from the converter.
Figure 17. AC-Coupled Differential Input
The analog input can be dc-coupled (see Figure 18) as long as the inputs are within the analog input common
mode voltage range. For example (see Figure 18), VIN+ and VIN- are signals centered on GND with a
peak-to-peak voltage of 2 V, and the circuit in Figure 18 is used to interface it with the THS1215. Assume AVDD
13
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