參數(shù)資料
型號(hào)： LTC6605IDJC-7#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 6/20頁(yè)
文件大小： 0K
描述： IC FILTER 7MHZ DUAL 22-DFN
標(biāo)準(zhǔn)包裝： 61
濾波器類型： 抗混迭
頻率 - 截止或中心： 5MHz
濾波器數(shù)： 2
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： 22-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 22-DFN（6x3）裸露焊盤
包裝： 管件
LTC6605-7
14
66057f
Input Impedance
Calculating the low frequency input impedance depends
on how the inputs are driven.
Figure 6 shows a simplied low frequency equivalent cir-
cuit. For balanced input sources (VINP = –VINM), the low
frequency input impedance is given by the equation:
RINP = RINM = R1
Therefore, the differential input impedance is simply:
RIN(DIFF) = 2 R1
APPLICATIONS INFORMATION
–
+
R2
VOUT
–
VOUT
+
VOCM
VOUTDIFF
0.1μF
66057 F06
R1
RINP
VINP
VINM
R1
R2
R3
+
–
+
–
RINM
Figure 6. Input Impedance
For single-ended inputs (VINM = 0), the input impedance
increases over the balanced differential case due to the
fact that the summing node (at the junction of R1, R2
and R3) moves in phase with VINP to bootstrap the input
impedance. Referring to Figure 6 with VINM = 0, the input
impedance looking into either input is:
RINP = RINM
R1
1
2
R2
R1+ R2
Input Common Mode Voltage Range
The input common mode voltage is dened as the average
of the two inputs into resistor R1:
VINCM =
VINP + VINM
2
The input common mode range is a function of the lter
conguration (GAIN), VINDIFF and the VOCM potential.
Referring to Figure 6, the summing junction where R1, R2
and R3 merge together should not swing within 1.4V of
the V+ power supply. Additionally, to avoid forward biasing
the ESD protection diodes on the input pins, neither input
should swing further than 325mV below the V– power
rail. Therefore, the input common mode voltage should
be constrained to:
V –325mV +
VINDIFF
2
≤ VINCM ≤ 1+
R1
R2
V+ 1.4V
()
R1
R2
VOCM
The specications in the Electrical Characteristics table are
a special case of the general equation above. For a single
3V power supply, (V+ = 3V, V– = 0V) with VOCM = 1.5V,
ΔVINDIFF = ±0.25V and R1 = R2, the valid input common
mode range is:
–200mV ≤ VINCM ≤ 1.7V
Likewise, for a single 5V power supply, (V+ = 5V, V–= 0V)
with VOCM = 2.5V, ΔVINDIFF = ±0.25V and R1 = R2, the valid
input common mode range is:
–200mV ≤ VINCM ≤ 4.7V
Output Common Mode and VOCM Pin
The output common mode voltage is dened as the aver-
age of the two outputs:
VOUTCM = VOCM =
VOUT+ + VOUT
2
As the equation shows, the output common mode voltage
is independent of the input common mode voltage, and
is instead determined by the voltage on the VOCM pin, by
means of an internal feedback loop.
If the VOCM pin is left open, an internal resistor divider
develops a potential halfway between the V+ and V– volt-
ages. The VOCM pin can be overdriven to another voltage
if desired. For example, when driving an ADC, if the ADC
makes a reference available for setting the common mode
voltage, it can be directly tied to the VOCM pin, as long as the
ADC is capable of driving the input impedance presented by
the VOCM pin as listed in the Electrical Characteristics table
(RVOCM). The Electrical Characteristics table also species
the valid range that can be applied to the VOCM pin.
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