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參數(shù)資料
| 型號： | TLV5580PW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 8-BIT, 80 MSPS LOW-POWER A/D CONVERTER |
| 中文描述： | 8位，80 MSPS的低功耗A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/34頁 |
| 文件大小： | 531K |
| 代理商： | TLV5580PW |
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TLV5580
8-BIT, 80 MSPS LOW-POWER A/D CONVERTER
SLAS205A – DECEMBER 1998 – REVISED JANUARY 1999
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLE OF OPERATION
dc coupled input
_
+
AVDD
VIN
REFTI
REFTO
REFBI
REFBO
AIN
TLV5580
_
+
VREF
VIN
REFTI
REFTO
REFBI
REFBO
AIN
TLV5580
RIN
R1
RIN
R2
(a)
(b)
Figure 13. DC-Coupled Input Circuit
For dc-coupled systems an opamp can level-shift a ground-referenced input signal. A circuit as shown in
Figure 13(a) is acceptable. Alternatively, the user might want a bipolar shift together with the bottom reference
voltage as seen in Figure 13(b). In this case the AIN voltage is given by:
AIN
2
R2
÷
R
1
R2
VREF– VIN
ac coupled input
VIN
AIN
TLV5580
R1
R2
VBIAS
+
–
C1
C2
Figure 14. AC-Coupled Input Circuit
For many applications, especially in single supply operation, ac coupling offers a convenient way for biasing
the analog input signal at the proper signal range. Figure 14 shows a typical configuration. To maintain the
outlined specifications, the component values need to be carefully selected. The most important issue is the
positioning of the 3 dB high-pass corner point f
–3 dB
, which is a function of R
2
and the parallel combination of
C
1
and C
2
, called C
eq
. This is given by the following equation:
f–3 dB
1
÷
2
π
x R2x Ceq
where C
eq
is the parallel combination of C
1
and C
2
.
Since C1 is typically a large electrolytic or tantalum capacitor, the impedance becomes inductive at higher
frequencies. Adding a small ceramic or polystyrene capacitor, C2 of approximately 0.01
μ
F, which is not
inductive within the frequency range of interest, maintains low impedance. If the minimum expected input signal
frequency is 20 kHz, and R2 equals 1 k
and R1 equals 50
, the parallel capacitance of C1 and C2 must be
a minimum of 8 nF to avoid attenuating signals close to 20 kHz.
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