VICM is dened as the average of the two input voltages,
參數(shù)資料
型號(hào)： LT1994MPDD#PBF
廠(chǎng)商： Linear Technology
文件頁(yè)數(shù)： 4/20頁(yè)
文件大小： 0K
描述： IC OP AMP I/O DIFF LN 8-DFN
標(biāo)準(zhǔn)包裝： 121
放大器類(lèi)型： 差分
電路數(shù)： 1
輸出類(lèi)型： 滿(mǎn)擺幅
轉(zhuǎn)換速率： 65 V/µs
增益帶寬積： 70MHz
電流 - 輸入偏壓： 18µA
電壓 - 輸入偏移： 3000µV
電流 - 電源： 14.8mA
電流 - 輸出 / 通道： 85mA
電壓 - 電源，單路/雙路(±)： 2.375 V ~ 12.6 V，±1.188 V ~ 6.3 V
工作溫度： -55°C ~ 125°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-WFDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 8-DFN-EP（3x3）
包裝： 管件
LT1994
12
1994fb
VICM is dened as the average of the two input voltages,
VINP and VINM (also called the input common mode
voltage):
VV
V
ICM
INP
INM
=+
()
1
2
and VINDIFF is dened as the difference of the input
voltages:
VINDIFF = VINP – VINM
When the feedback ratios mismatch (
Δβ), common mode
to differential conversion occurs.
Setting the differential input to zero (VINDIFF = 0), the de-
gree of common mode to differential conversion is given
by the equation:
VV
V
VV
V
OUTDIFF
OUT
ICM
OCM
AVG
INDIFF
–
0
In general, the degree of feedback pair mismatch is a source
of common mode to differential conversion of both signals
and noise. Using 1% resistors or better will provide about
28dB of common mode rejection. Using 0.1% resistors
will provide about 48dB of common mode rejection. A low
impedance ground plane should be used as a reference
for both the input signal source and the VOCM pin. A direct
short of VOCM to this ground plane or bypassing the VOCM
with a high quality 0.1μF ceramic capacitor to this ground
plane will further mitigate against common mode signals
from being converted to differential.
Input Impedance and Loading Effects
The input impedance looking into the VINP or VINM input
of Figure 1 depends on whether or not the sources VINP
and VINM are fully differential. For balanced input sources
(VINP = –VINM), the input impedance seen at either input
is simply:
RINP = RINM = RI
For single-ended inputs, because of the signal imbalance
at the input, the input impedance actually increases over
the balanced differential case. The input impedance looking
into either input is:
RR
R
RR
INP
INM
I
F
IF
==
+
1
2
–
Input signal sources with non-zero output impedances can
also cause feedback imbalance between the pair of feedback
networks. For the best performance, it is recommended
that the source’s output impedance be compensated for.
If input impedance matching is required by the source,
R1 should be chosen (see Figure 3):
R
RR
INM
S
INM
S
1
=
According to Figure 3, the input impedance looking into
the differential amp (RINM)reectsthesingle-endedsource
case, thus:
R
RR
INM
I
F
IF
=
+
1
2
–
R2 is chosen to balance R1||RS:
R
RR
S
2
1
=
+
Figure 3. Optimal Compensation for Signal-Source Impedance
1994 F03
RI
RF
RS
VS
+
–
+
LT1994
RI
RF
R2 = RS || R1
R1 CHOSEN SO THAT R1 || RINM = RS
R2 CHOSEN TO BALANCE R1 || RS
R1
RINM
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