參數(shù)資料
型號(hào): THS0842PFB
廠(chǎng)商: Texas Instruments, Inc.
英文描述: DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER WITH SINGLE OR DUAL PARALLEL BUS OUTPUT
中文描述: 雙輸入,8位,40 MSPS的低功耗模擬數(shù)字轉(zhuǎn)換器單路或雙路并行總線(xiàn)輸出
文件頁(yè)數(shù): 20/29頁(yè)
文件大小: 479K
代理商: THS0842PFB
THS0842
DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER
WITH SINGLE OR DUAL PARALLEL BUS OUTPUT
SLAS246 – DECEMBER 1999
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
analog input (continued)
1.5 V
I/Q+
1.5 + 0.25 V
I/Q+
1.5 – 0.25 V
Positive
Analog
Input
1.5 V
I/Q–
1.5 – 0.25 V
I/Q–
1.5 + 0.25 V
Negative
Analog
Input
0 V
+0.5 V
Differential
Input
–0.5 V
1.0 Vp–p
Figure 19. Differential Input Waveform
The analog input can be dc coupled (Figure 21) as long as the inputs are within the analog input common mode
voltage range. The resistors, R, in Figure 21 are not absolutely necessary but may be used as load setting
resistors. A capacitor, C, connected from I/Q IN+ to I/Q IN– will help 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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