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參數(shù)資料
| 型號(hào)： | AD8139ACPZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Low Noise Rail-to-Rail Differential ADC Driver |
| 中文描述： | OP-AMP, 500 uV OFFSET-MAX, DSO8 |
| 封裝： | 3 X 3 MM, LEAD FREE, LFCSP-8 |
| 文件頁數(shù)： | 20/24頁 |
| 文件大小： | 720K |
| 代理商： | AD8139ACPZ-REEL |
AD8139
Using the β notation, Equation 15 can be written as
(
OCM
ACM
V
V
+
β
=
1
Rev. A | Page 20 of 24
)
ICM
V
β
(16)
or equivalently,
(
)
ICM
OCM
V
ICM
ACM
V
V
V
β
+
=
(17)
where
V
ICM
is the common-mode voltage of the input signal, i.e.,
V
V
V
=
.
2
IN
IP
ICM
+
For proper operation, the voltages at V
AN
and V
AP
must stay
within their respective linear ranges.
Calculating Input Impedance
The input impedance of the circuit in Figure 57 will depend on
whether the amplifier is being driven by a single-ended or a
differential signal source. For balanced differential input signals,
the differential input impedance (
R
IN, dm
) is simply
G
dm
IN,
R
R
2
=
(18)
For a single-ended signal (for example, when V
IN
is grounded
and the input signal drives V
IP
), the input impedance becomes
)
(
1
F
G
F
+
G
R
IN
R
R
R
R
=
(19)
The input impedance of a conventional inverting op amp
configuration is simply R
G
, but it is higher in Equation 19
because a fraction of the differential output voltage appears at
the summing junctions, V
AN
and V
AP
. This voltage partially
bootstraps the voltage across the input resistor R
G
, leading to
the increased input resistance.
Input Common-Mode Swing Considerations
In some single-ended-to-differential applications, when using a
single-supply voltage attention must be paid to the swing of the
input common-mode voltage, V
ACM
.
Consider the case in Figure 59, where
V
IN
is 5 V p-p swinging
about a baseline at ground and
V
REF
is connected to ground.
0
DGND AGND REFGND REF REFBUFIN PDBUF
ADR431
2.5V
REFERENCE
47
μ
F
AD7674
IN+
IN–
AVDD
DVDD
AD8139
+
–
8
V
REF
2.5V
2
1
6
3
4
5
V
OCM
200
200
324
324
5V
20
15
15
V
IN
2.7nF
2.7nF
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
+1.7V
+0.95V
+0.2V
V
ACM
WITH V
REF
+2.5V
GND
–2.5V
Figure 59. AD8139 Driving AD7674, 18-Bit, 800 kSPS A/D Converter
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