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参数资料
| 型号： | LTC6605IDJC-7#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC FILTER 7MHZ DUAL 22-DFN |
| 标准包装： | 2,500 |
| 滤波器类型： | 抗混迭 |
| 频率 - 截止或中心： | 5MHz |
| 滤波器数： | 2 |
| 滤波器阶数： | 2nd |
| 电源电压： | 2.7 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 22-WFDFN 裸露焊盘 |
| 供应商设备封装： | 22-DFN（6x3）裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC6605-7
16
66057f
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.
At the output, always keep in mind the differential nature
of the LTC6605-7, because it is important that the load
impedances seen by both outputs (stray or intended) be
APPLICATIONS INFORMATION
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 LTC6605-7’s rail-to-rail differential output and adjust-
able output common mode voltage make it ideal for inter-
facing 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 LTC6605-7 makes
interfacing to these ADCs easy, by providing antialiasing,
single-ended to differential conversion 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 LTC6605-7
will settle quickly from these periodic load impulses. The
RC network between the outputs of the driver decouples
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