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參數(shù)資料
| 型號： | THS1230IPWRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | GREEN, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 6/25頁 |
| 文件大?。?/td> | 884K |
| 代理商： | THS1230IPWRG4 |
www.ti.com
VIN+
VIN
R1
R2
+
R1
R2
+
C1
C2
THS1230
AIN+
AIN
REFT
REFB
AVDD
2
THS1230
SLAS291B – OCTOBER 2000 – REVISED MARCH 2004
The analog input of the THS1230 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), V+ and V– 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 THS1230. Assume AVDD of the
converter is 3 V. Two problems have to be solved. The first is to shift common mode level (CML) from 0 V to 1.5
V (AVDD/2). To do that, a V bias voltage and an adequate ratio of R1 and R2 have to be selected. For instance, if
V bias = AVDD = 3 V, then R1 = R2. The second is that the differential voltage has to be reduced from 4 V (2 x 2
V) to 1 V, and for that an attenuation of 4 to1 is needed. The attenuation is determined by the relation:
(R3||2R2)/((R3||2R2) + 2R1). One possible solution is R1 = R2 = R3 = 150
. In this case, moreover, the input
impedance (2R1 + (R3||2R2)) will be 400
. The values can be changed to match any other input impedance. A
capacitor, C, connected from AIN+ to AIN– helps filter any high frequency noise on the inputs, also improving
performance. Note that the chosen value of capacitor C must take into account the highest frequency component
of the analog input signal.
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