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| 型号： | ADA4950-1YCP-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADA4950-1YCP |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 放大器类型： | 差分 |
| 板类型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 16-LFCSP 封装 |
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ADA4950-1/ADA4950-2
Data Sheet
Rev. A | Page 20 of 28
Table 12. Differential Input, DC-Coupled
Nominal Linear Gain
RF (Ω)
RG (Ω)
RIN, dm (Ω)
Differential Output Noise Density (nV/√Hz)
1
500
1000
9.25
2
500
250
500
12.9
3
500
250||500
333
16.6
Table 13. Single-Ended, Ground-Referenced Input, DC-Coupled, RS = 50
Nominal Linear Gain
RF (Ω)
RG1 (Ω)
RT (Ω) (Std 1%) RIN, se (Ω)
Differential Output Noise Density (nV/√Hz)
1
500
53.6
667
526
9.07
2
500
250
57.6
375
277
12.2
3
500
250||500 61.9
267
194
15.0
1
RG2 = RG1 + (RS||RT).
Similar to the case of a conventional op amp, the output noise
voltage densities can be estimated by multiplying the input-
referred terms at +INx and INx by the appropriate output
factor, where:
(
)
2
1
N
β
G
+
=
2
is the circuit noise gain.
G1
F1
G1
1
R
β
+
=
and
G2
F2
G2
2
R
β
+
=
are the feedback factors.
When the feedback factors are matched, RF1/RG1 = RF2/RG2,
β1 = β2 = β, and the noise gain becomes
G
F
N
R
β
G
+
=
1
Note that the output noise from VOCM goes to 0 in this case. The
total differential output noise density, vnOD, is the root-sum-
square of the individual output noise terms.
∑
=
8
1
i
2
nOi
nOD
v
Table 12 and Table 13 list the three available gain settings,
associated resistor values, input impedance, and output noise
density for both balanced and unbalanced input configurations.
CALCULATING THE INPUT IMPEDANCE FOR AN
APPLICATION CIRCUIT
The effective input impedance of a circuit depends on whether
the amplifier is being driven by a single-ended or differential
signal source. For balanced differential input signals, as shown
RIN, dm = (RG + RG) = 2 × RG
The value of RG depends on the selected gain.
+VS
–VS
+IN
–IN
RF
VOCM
RG
VOUT, dm
VIN, dm
07957-
054
ADA4950-x
Figure 54. ADA4950-x Configured for Balanced (Differential) Inputs
For an unbalanced, single-ended input signal (see Figure 55),
the input impedance is
(
)
+
×
=
F
G
F
G
se
IN
R
2
1
,
ADA4950-x
RL VOUT, dm
+VS
–VS
RG
RF
VOCM
RIN, se
07957-
055
Figure 55. ADA4950-x with Unbalanced (Single-Ended) Input
The input impedance of the circuit is effectively higher than it
is for a conventional op amp connected as an inverter because a
fraction of the differential output voltage appears at the inputs
as a common-mode signal, partially bootstrapping the voltage
across the input resistor, RG. The common-mode voltage at the
amplifier input terminals can be easily determined by noting
that the voltage at the inverting input is equal to the noninverting
output voltage divided down by the voltage divider that is formed
by RF and RG in the lower loop. This voltage is present at both
input terminals due to negative voltage feedback and is in phase
with the input signal, thus reducing the effective voltage across
RG in the upper loop and partially bootstrapping RG.
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