參數(shù)資料
型號(hào)： LTC6601CUF-1#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 10/40頁(yè)
文件大小： 0K
描述： IC DRVR FILTER/ADC LN 20-QFN
標(biāo)準(zhǔn)包裝： 91
頻率 - 截止或中心： 28Mhz
濾波器數(shù)： 3
濾波器階數(shù)： 2nd
電源電壓： 2.7 V ~ 5.25 V
安裝類型： 表面貼裝
封裝/外殼： 20-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 20-QFN 裸露焊盤（4x4）
包裝： 管件
LTC6601-1
18
66011f
LTC6601 ideally suited for pre-amplication, level shift-
ing and conversion of single-ended signals to differential
output signals for driving differential input ADCs.
INPUT IMPEDANCE
Calculating the low frequency input impedance of the
LTC6601 depends on how the inputs are driven (whether
they are driven from a single-ended or a differential
source).
Figure 4 shows a simplied low frequency equivalent
circuit of the LTC6601. For balanced input sources (VINP
= –VINM), the low frequency input impedance is given by
the equation:
RINP = RINM = R1
The differential input impedance is simply:
RINDIFF = 2 R1
For single-ended inputs (VINM = 0), the input impedance
actually increases over the balanced differential case due
to the fact the summing node (at the junction of R1, R2
and R3) moves in phase with VINP to bootstrap the input
impedance. Referring to Figure 4 with VINM = 0, the input
impedance looking into either input is:
RINP =RINM
R1
1– 1
2
R2
R1+R2
Input and Output Common Mode Voltage Range
The input common mode voltage is dened as the average
of the two inputs:
VINCM =
VINP + VINM
2
The lower limit of the input common mode range is dic-
tated by the ESD protection diodes at the input. While it
is possible for the inputs to swing below V–, the diodes
will conduct if the inputs are taken a diode drop below V–.
The upper limit of the input common mode range varies
as a function of the lter conguration (GAIN), VOCM po-
tential, and whether or not the inputs are single-ended or
differential. While it is possible to exceed the upper limit
of the common mode range, doing so will degrade lter
linearity. Referring to Figure 4, for linear operation, the
summing junction where R1, R2 and R3 merge together
should be prevented from swinging to within 1.4V of the
V+ power supply.
For the general case, the upper input common mode volt-
age limit should be constrained to:
VOCM
R1
R1+R2
+ VINCM
R2
R1+R2
≤ V+ – 1.4V
Or equivalently:
VINCM ≤ 1+
R1
R2
V+ 1.4V
() R1
R2
VOCM
The specications for input common mode range (VINCMR)
are based on these constraints with R1 = R2 = 100Ω, and
VOCM = mid-supply. Substituting the numbers for a single
3V power supply, (V+ = 3V, V– = 0V) with VOCM =1.5V, and
R1 = R2 = 100Ω, into the above equation, the input com-
mon mode range (VINCMR) is between the two limits:
0V ≤ VINCM ≤ 1.7V
which is as is specied for a 3V supply.
APPLICATIONS INFORMATION
–
+
R2
VOUT
–
VOUT
+
VOCM
VOUTDIFF
0.1μF
66011 F04
R1
RINP
VINP
VINM
R1
R2
R3
+
–
+
–
RINM
Figure 4. Input Impedance
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