參數(shù)資料
型號(hào)： LTC6605IDJC-10#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 0K
描述： IC FILTER 10MHZ 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
LTC6605-10
16
660510f
Board Layout and Bypass Capacitors
For single-supply applications it is recommended that a
high quality X5R or X7R, 0.1μF bypass capacitor be placed
directly between V+ and the adjacent V– pin. The V– pins,
including the Exposed Pad, should be tied directly to a low
impedance ground plane with minimal routing.
For split power supplies, it is recommended that addi-
tional high quality X5R or X7R, 0.1μF capacitors be used
to bypass pin V+ to ground and V– to ground, again with
minimal routing.
For driving heavy differential loads (< 200Ω), additional
bypass capacitance may be needed between V+ and V– for
optimal performance. Keep in mind that small geometry
(e.g., 0603) surface mount ceramic capacitors have a much
higher self-resonant frequency than do leaded capacitors,
and perform best in high speed applications.
The VOCM pins should be bypassed to ground with a high
quality ceramic capacitor (at least 0.01μF). In split-sup-
ply applications, the VOCM pin can be either bypassed to
ground or directly hard wired to ground.
Stray parasitic capacitances to any unused input pins
should be kept to a minimum to prevent deviations from the
ideal frequency response. The best approach is to remove
the solder pads for the unused component pins and strip
away any ground plane underneath. Floating unused pins
does not reduce the reliability of the part.
APPLICATIONS INFORMATION
At the output, always keep in mind the differential nature
of the LTC6605-10, because it is important that the load
impedances seen by both outputs (stray or intended) be
as balanced and symmetric as possible. This will help pre-
serve the balanced operation that minimizes the generation
of even-order harmonics and maximizes the rejection of
common mode signals and noise.
Driving ADCs
The LTC6605-10’s rail-to-rail differential output and
adjustable output common mode voltage make it ideal
for interfacing to differential input ADCs. These ADCs
are typically supplied from a single-supply voltage
which can be as low as 3V (2.7V minimum), and have an
optimal common mode input range near mid-supply. The
LTC6605-10 makes interfacing to these ADCs easy, by
providing antialiasing, single-ended to differential conver-
sion and common mode level shifting.
The sampling process of ADCs creates a transient that is
caused by the switching in of the ADC sampling capaci-
tor. This momentarily “shorts” the output of the amplier
as charge is transferred between amplier and sampling
capacitor. The amplier must recover and settle from this
load transient before the acquisition period has ended, for a
valid representation of the input signal. The LTC6605-10 will
settle quickly from these periodic load impulses. The RC
network between the outputs of the driver decouples the
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