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參數(shù)資料
型號: ADA4922-1ACPZ-RL7
廠商: ANALOG DEVICES INC
元件分類: 運動控制電子
英文描述: High Voltage, Differential 18-Bit ADC Driver
中文描述: OP-AMP, DSO8
封裝: 3 X 3 MM, LEAD FREE, LFCSP-8
文件頁數(shù): 14/20頁
文件大小: 312K
代理商: ADA4922-1ACPZ-RL7
ADA4922-1
THEORY OF OPERATION
The ADA4922-1 is dual amplifier that has been optimized to
drive a differential ADC from a single-ended input source with
a minimum number of external components (see Figure 41).
Rev. 0 | Page 14 of 20
R
R
IN
OUT+
OUT–
REF
0
Figure 41. Functional Diagram
The differential output voltage is defined as
V
O, dm
=
V
OUT+
V
OUT
(1)
Each amplifier in Figure 41 is identical, and the value of Resistor R
is set at 600 Ω, yielding an optimal trade-off between output
differential noise, internal power dissipation, and overall
system linearity. For basic operation, the REF input is tied to
the midswing level of the input signal, which is often midsupply.
The input signal (referenced to REF) produces a differential
output signal with an overall gain of +2. Figure 42 shows typical
operation on ±12 V supplies with the source referenced to 0 V
and the REF pin tied to 0 V.
20
–10
0
50
0
TIME (
μ
s)
V
10
0
–10
–20
10
5
0
–5
5
15
10
20
25
30
35
40
45
OUT+
OUT–
REF
V
IN
Figure 42. Typical Input/Output Response—Centered Reference
If an application uses an input midswing voltage other than
midsupply, the REF pin needs to be offset to the input midswing
level to obtain outputs that do not exhibit a differential offset
(see Figure 43). If the voltage applied to the REF pin is different
from the midswing level of the input signal, a dc offset is
created between outputs V
OUT+
and V
OUT
. Figure 44 illustrates
this condition when the input signal is referenced to a positive
level, and the REF pin is connected to 0 V.
10
–2.5
0
50
0
TIME (
μ
s)
V
5
0
–5
–10
10
5
0
5
15
10
20
25
30
35
40
45
OUT+
OUT–
REF
V
IN
Figure 43. Typical Input/Output Response—Equal Input/Reference
20
–10
0
50
0
TIME (
μ
s)
V
15
10
5
0
–5
10
5
0
–5
5
15
10
20
25
30
35
40
45
OUT+
OUT–
REF
V
IN
Figure 44. Typical Input/Output Response—Unequal Input/Reference
相關(guān)PDF資料
PDF描述
ADA4922-1ARDZ High Voltage, Differential 18-Bit ADC Driver
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ADA4937-1 Ultralow Distortion, Differential ADC Driver
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