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| 型號(hào)： | AD8137YCPZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Low Cost, Low Power 12-Bit Differential ADC Driver |
| 中文描述： | OP-AMP, 2600 uV OFFSET-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, LFCSP-8 |
| 文件頁(yè)數(shù)： | 18/24頁(yè) |
| 文件大小： | 594K |
| 代理商： | AD8137YCPZ-REEL |
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AD8137
APPLICATIONS
ANALYZING A TYPICAL APPLICATION WITH
MATCHED R
F
AND R
G
NETWORKS
Typical Connection and Definition of Terms
Figure 63 shows a typical connection for the AD8137, using
matched external R
F
/R
G
networks. The differential input
terminals of the AD8137, V
AP
and V
AN
, are used as summing
junctions. An external reference voltage applied to the V
OCM
terminal sets the output common-mode voltage. The two
output terminals, V
OP
and V
ON
, move in opposite directions in a
balanced fashion in response to an input signal.
Rev. A | Page 18 of 24
0
+
–
V
AP
V
AN
V
ON
V
OP
–
+
V
O, dm
R
L, dm
AD8137
C
F
R
F
R
G
R
G
C
F
R
F
V
IP
V
OCM
V
IN
Figure 63. Typical Connection
The differential output voltage is defined as
ON
OP
dm
O,
V
V
V
=
(1)
Common-mode voltage is the average of two voltages. The
output common-mode voltage is defined as
2
,
ON
OP
cm
O
V
V
V
+
=
(2)
Output Balance
Output balance is a measure of how well V
OP
and V
ON
are
matched in amplitude and how precisely they are 180 degrees
out of phase with each other. It is the internal common-mode
feedback loop that forces the signal component of the output
common-mode towards zero, resulting in the near perfectly
balanced differential outputs of identical amplitude and exactly
180 degrees out of phase. The output balance performance does
not require tightly matched external components, nor does it
require that the feedback factors of each loop be equal to each
other. Low frequency output balance is limited ultimately by the
mismatch of an on-chip voltage divider.
Output balance is measured by placing a well matched resistor
divider across the differential voltage outputs and comparing
the signal at the divider’s midpoint with the magnitude of the
differential output. By this definition, output balance is equal to
the magnitude of the change in output common-mode voltage
divided by the magnitude of the change in output differential-
mode voltage:
dm
O
cm
O
V
V
Balance
Output
,
,
=
(3)
The differential negative feedback drives the voltages at the sum-
ming junctions V
AN
and V
AP
to be essentially equal to each other.
AP
AN
V
V
=
(4)
The common-mode feedback loop drives the output common-
mode voltage, sampled at the midpoint of the two internal
common-mode tap resistors in Figure 61, to equal the voltage
set at the V
OCM
terminal. This ensures that
2
,
dm
O
OCM
V
OP
V
V
+
=
(5)
and
2
,
dm
O
OCM
V
ON
V
V
=
(6)
ESTIMATING NOISE, GAIN, AND BANDWITH WITH
MATCHED FEEDBACK NETWORKS
Estimating Output Noise Voltage and Bandwidth
The total output noise is the root-sum-squared total of several
statistically independent sources. Since the sources are statisti-
cally independent, the contributions of each must be individu-
ally included in the root-sum-square calculation. Table 7 lists
recommended resistor values and estimates of bandwidth and
output differential voltage noise for various closed-loop gains.
For most applications, 1% resistors are sufficient.
Table 7. Recommended Values of Gain-Setting Resistors, and
Voltage Gain for Various Closed-Loop Gains
3 dB
Bandwidth (MHz)
1
1 k
1 k
72
2
1 k
2 k
40
5
1 k
5 k
12
10
1 k
10 k
6
The differential output voltage noise contains contributions
from the AD8137’s input voltage noise and input current noise
as well as those from the external feedback networks.
Gain
R
G
()
R
F
()
Total Output
Noise (nV/√Hz)
18.6
28.9
60.1
112.0
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