The LT1994’s input common mode voltage (VICM
參數(shù)資料
型號(hào)： LT1994IDD#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 0K
描述： IC DIFF AMP/DRIVER LN 8-DFN
標(biāo)準(zhǔn)包裝： 121
放大器類型： 差分
電路數(shù)： 1
輸出類型： 滿擺幅
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： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 8-DFN-EP（3x3）
包裝： 管件
產(chǎn)品目錄頁(yè)面： 1322 (CN2011-ZH PDF)
13
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LT1994
Input Common Mode Voltage Range
The LT1994’s input common mode voltage (VICM)isdened
as the average of the two input voltages, VIN+, and VIN–.
It extends from V– to approximately 1.25V below V+. The
input common mode range depends on the circuit con-
guration (gain), VOCM and VCM (refer to Figure 4). For
fully differential input applications, where VINP = –VINM,
the common mode input is approximately:
V
VV
V
R
RR
V
R
RR
ICM
IN
OCM
I
IF
CM
F
FI
=
+
≈
+
+
+
–
2
With singled-ended inputs, there is an input signal com-
ponent to the input common mode voltage. Applying only
VINP (setting VINM to zero), the input common voltage is
approximately:
V
VV
V
R
RR
V
R
RR
VR
RR
ICM
IN
OCM
I
IF
CM
F
FI
INP
F
FI
=
+
≈
+
+
+
+
–
2
Output Common Mode Voltage Range
The output common mode voltage is dened as the aver-
age of the two outputs:
VV
OUTCM
OCM
OUT
==
+
–
2
The VOCM sets this average by an internal common mode
feedback loop which internally forces VOUT+ = –VOUT–. The
output common mode range extends from approximately
1.1V above V– to approximately 0.8V below V+. The VOCM
pin sits in the middle of an 80k
Ω to 80kΩ voltage divider
that sets the default mid-supply open-circuit potential.
In single-supply applications, where the LT1994 is used
to interface to an ADC, the optimal common mode input
range to the ADC is often determined by the ADC’s refer-
ence. If the ADC makes a reference available for setting
the input common mode voltage, it can be directly tied
to the VOCM pin, but must be capable of driving a 40k
equivalent resistance that is tied to a mid-supply potential.
If an external reference drives the VOCM pin, it should still
be bypassed with a high quality 0.1μF capacitor to a low
impedance ground plane to lter any thermal noise and
to prevent common mode signals on this pin from being
inadvertently converted to differential signals.
Noise Considerations
The LT1994’s input referred voltage noise is on the order
of 3nV/√Hz. Its input referred current noise is on the
order of 2.5pA/√Hz. In addition to the noise generated
by the amplier, the surrounding feedback resistors also
contribute noise. The output noise generated by both the
amplier and the feedback components is given by the
equation:
e
R
IR
e
R
e
no
ni
F
I
nF
nRI
F
I
nRF
=
+
+
() +
+
12
22
2
Figure 4. Circuit for Common Mode Range
VCM
1994 F04
RI
RF
RL
VS
VSHDNB
VINM
VINP
+
–
+
3
7
6
8
1
2
5
4
LT1994
VOCM
VOUT
+
VIN
–
VOUT
–
VIN
+
0.1μF
RI
RF
RL
SHDN
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