参数资料
型号: LTC6605IDJC-14#TRPBF
厂商: Linear Technology
文件页数: 2/20页
文件大小: 0K
描述: IC FILTER 14MHZ 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)
LTC6605-14
10
660514f
Functional Description
The LTC6605-14 is designed to make the implementation
of high frequency fully differential ltering functions very
easy. Two very low noise ampliers are surrounded by
precision matched resistors and precision matched capaci-
tors enabling various lter functions to be implemented by
hard wiring pins. The ampliers are wide band, low noise
and low distortion fully differential ampliers with accurate
output phase balancing. They are optimized for driving
low voltage, single-supply, differential input analog-to-
digital converters (ADCs). The LTC6605-14 operates with
a supply voltage as low as 2.7V and accepts inputs up to
325mV below the Vpower rail, which makes it ideal for
converting ground referenced, single-ended signals into
differential signals that are referenced to the user-supplied
common mode voltage. This is ideal for driving low volt-
age, single-supply, differential input ADCs. The balanced
differential nature of the amplier and matched surround-
ing components provide even-order harmonic distortion
cancellation, and low susceptibility to common mode
noise (like power supply noise). The LTC6605-14 can be
operated with a single-ended input and differential output,
or with a differential input and differential output.
The outputs of the LTC6605-14 can swing rail-to-rail.
They can source or sink a transient 70mA of current. Load
capacitances should be decoupled with at least 25Ω of
series resistance from each output.
Filter Frequency Response and Gain Adjustment
Figure 3 shows the lter architecture. The Laplace transfer
function can be expressed in the form of the following
generalized equation for a 2nd order lowpass lter:
VOUT(DIFF)
VIN(DIFF)
=
GAIN
1+
s
2πfO Q
+
s2
2πfO
()
2
,
with GAIN, fO and Q as given in Figure 3.
Note that GAIN and Q of the lter are based on component
ratios, which both match and track extremely well over
temperature. The corner frequency fO of the lter is a
function of an RC product. This RC product is trimmed to
±1% and is not expected to drift by more than ±1% from
nominal over the entire temperature range –40°C to 85°C.
As a result, fully differential lters with tight magnitude,
phase tolerance and repeatability are achieved.
Various values for resistors R1 and R4 can be formed
by pin-strapping the internal 100Ω and 200Ω resis-
tors, and optionally by including one or more external
resistors. Note that non-zero source resistance should be
combined with, and included in, R1.
Figure 3. Filter Architecture and Equations
APPLICATIONS INFORMATION
+
VOUT(DIFF)
660514 F03
VIN(DIFF)
R2
200Ω
R2
200Ω
R3
125Ω
R3
125Ω
R1
R4 = R4A + R4B + REXT
REXT
R4A
R4B
C1
48.2pF
C1
48.2pF
C2
81.5pF
C2
81.5pF
+
+
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