MINIMUM RG VALUE Due to the wide band" />
參數(shù)資料
型號(hào)： ADA4930-2YCP-EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 13/29頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR ADA4930-2YCP
標(biāo)準(zhǔn)包裝： 1
每 IC 通道數(shù)： 2 - 雙
放大器類型： 差分
板類型： 裸（未填充）
已供物品： 板
已用 IC / 零件： 24-LFCSP 封裝
ADA4930-1/ADA4930-2
Rev. A | Page 19 of 28
MINIMUM RG VALUE
Due to the wide bandwidth of the ADA4930-1/ADA4930-2, the
value of RG must be greater than or equal to 301 Ω at unity gain
to provide sufficient damping in the amplifier front end. In the
terminated case, RG includes the Thevenin resistance of the
source and load terminations.
SETTING THE OUTPUT COMMON-MODE VOLTAGE
The VOCM pin of the ADA4930-1/ADA4930-2 is biased at 3/10 of
the total supply voltage above VS with an internal voltage divider.
The input impedance of the VOCM pin is 8.4 kΩ. When relying
on the internal bias, the output common-mode voltage is within
about 100 mV of the expected value.
In cases where accurate control of the output common-mode
level is required, it is recommended that an external source or
resistor divider be used with source resistance less than 100 Ω.
The output common-mode offset listed in the Specifications
section assumes that the VOCM input is driven by a low impedance
voltage source.
It is also possible to connect the VOCM input to a common-mode
voltage (VCM) output of an ADC. However, care must be taken
to ensure that the output has sufficient drive capability. The
input impedance of the VOCM pin is approximately 10 kΩ. If
multiple ADA4930-1/ADA4930-2 devices share one reference
output, it is recommended that a buffer be used.
CALCULATING THE INPUT IMPEDANCE FOR AN
APPLICATION CIRCUIT
The effective input impedance depends on whether the signal
source is single-ended or differential. For a balanced differential
input signal, as shown in Figure 44, the input impedance (RIN,dm)
between the inputs (+DIN and DIN) is RIN, dm = 2 × RG.
+VS
ADA4930
+IN
–IN
RF
+DIN
–DIN
VOCM
RG
VOUT, dm
09
20
9-
0
51
Figure 44. ADA4930-1/ADA4930-2 Configured for Balanced (Differential) Inputs
For an unbalanced single-ended input signal, as shown in
Figure 45, the input impedance is
RIN,SE = RG1
)
1
(
+
β2
β1
β2
β1
where:
β1 =
F1
G1
R
+
β2 =
2
F
G2
G
R
+
ADA4930
RL VOUT, dm
+VS
–VS
RG1
RG2
RF2
RF1
VOCM
RIN, SE
0
92
09
-05
2
Figure 45. ADA4930-1/ADA4930-2 with Unbalanced (Single-Ended) Input
For a balanced system where RG1 = RG2 = RG and RF1 = RF2 = RF,
the equations simplify to
+
=
+
=
)
2(
1
F
G
F
G
IN,SE
F
G
R
and
R
β2
β1
The input impedance of the circuit is effectively higher than it
would be 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 RG1. 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
formed by RF2 and RG2. 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
RG1, partially bootstrapping it.
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