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| 型号： | AD8137YRZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/33页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF R-R LP 20MA 8SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 输出类型： | 差分，满摆幅 |
| 转换速率： | 450 V/µs |
| -3db带宽： | 110MHz |
| 电流 - 输入偏压： | 500nA |
| 电压 - 输入偏移： | 700µV |
| 电流 - 电源： | 3.2mA |
| 电流 - 输出 / 通道： | 20mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 12 V，± 2.7 V ~ 6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
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Data Sheet
AD8137
Rev. E | Page 23 of 32
APPLICATIONS INFORMATION
ANALYZING A TYPICAL APPLICATION WITH
MATCHED RF AND RG NETWORKS
Typical Connection and Definition of Terms
matched external RF/RG networks. The differential input
junctions. An external reference voltage applied to the VOCM
terminal sets the output common-mode voltage. The two
output terminals, VOP and VON, move in opposite directions
in a balanced fashion in response to an input signal.
04771-0-055
+
–
VAP
VAN
VON
VOP
–
+
VO, dm
RL, dm
AD8137
CF
RF
RG
CF
RF
VIP
VOCM
VIN
Figure 64. Typical Connection
The differential output voltage is defined as
VO, dm = VOP VON
(1)
Common-mode voltage is the average of two voltages. The
output common-mode voltage is defined as
2
,
ON
OP
cm
O
V
+
=
(2)
Output Balance
Output balance is a measure of how well VOP and VON are
matched in amplitude and how precisely they are 180° out of
phase with each other. It is the internal common-mode feedback
loop that forces the signal component of the output common-
mode toward zero, resulting in the near perfectly balanced
differential outputs of identical amplitude and are exactly 180°
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 ultimately limited 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
Balance
Output
,
=
(3)
The differential negative feedback drives the voltages at the summing
junctions VAN and VAP to be essentially equal to each other.
VAN = VAP
(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 62, to equal the voltage
set at the VOCM terminal. This ensures that
2
, dm
O
OCM
OP
V
+
=
(5)
and
2
, dm
O
OCM
ON
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. Because the sources are
statistically independent, the contributions of each must be
individually 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
Gain
RG ()
RF ()
3 dB Bandwidth
(MHz)
Total Output
Noise (nV/√Hz)
1
1 k
72
18.6
2
1 k
2 k
40
28.9
5
1 k
5 k
12
60.1
10
1 k
10 k
6
112.0
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