参数资料
| 型号： | LTC6603CUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS 24-QFN |
| 标准包装： | 91 |
| 滤波器类型： | 低通 |
| 频率 - 截止或中心： | 80MHz |
| 滤波器数： | 2 |
| 滤波器阶数： | 9th |
| 电源电压： | 2.7 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 管件 |
LTC6603
21
6603fa
APPLICATIONS INFORMATION
results in four matched lter channels, all synchronized to
the same clock. The master has its CLKCNTL pin pulled
to V+D, conguring its CLKIO pin as an output, while the
slave has its CLKCNTL pin pulled to ground, conguring its
CLKIO pin as an input. Note that in order to synchronize the
two lters, the clock frequency must not be buffered. This
requires that the lters be close together on the PC board.
If the clock is buffered, the lters would have matching
bandwidths, but would not be synchronized.
Output Drive
The lter outputs can drive 1k and/or 50pF loads connected
to AC ground with a 0.5V to 2.5V signal (corresponding
to a 4VP-P differential signal). For differential loads (loads
connected between +OUTA and –OUTA or +OUTB and
–OUTB) the outputs can produce a 4VP-P signal across 2k
and/or 25pF. For smaller signal amplitudes, the outputs can
drive correspondingly larger loads. For larger capacitive
loads, an external 50Ω series resistor is recommended
for each output.
Clock Feedthrough
Clock feedthrough is dened as the RMS value of the clock
frequency and its harmonics that are present at the lter’s
output. The clock feedthrough is measured with +INA and
–INA (or +INB, –INB) tied to VOCM and depends on the PC
board layout and the power supply decoupling. The clock
feedthrough can be reduced with a simple RC post lter.
Decoupling Capacitors
The LTC6603 uses sampling techniques, therefore its
performance is sensitive to supply noise. 0.1μF ceramic
decoupling capacitors must be connected from V+A (Pin 2)
and V+D (Pin 16) to ground with leads as short as possible.
A ground plane should be used. Noisy signals should be
isolated from the lter’s input pins. In addition, a 0.1μF
decoupling capacitor at Pin 20 is recommended since this
pin receives clocked current injection.
Aliasing
Aliasing is an inherent phenomenon of sampled data lters.
Signicant aliasing only occurs when the frequency of
the input signal approaches the sampling frequency or
multiples of the sampling frequency. The ratio of the
LTC6603 input sampling frequency to the clock frequency,
fCLK, is determined by the state of control bits LPF1 and
LPF0. Table 6 shows the possible input sampling frequen-
cies for a clock frequency of 80MHz. The input sampling
frequency is proportional to the clock frequency. For
example, if the clock frequency is lowered from 80MHz
to 40MHz, the input sampling frequency will be lowered
by half. Input signals with frequencies near the input
sampling frequency will be aliased to the passband of
the lter and appear at the output unattenuated.
Table 6. Input Sampling Frequency (fCLK = 80MHz)
LPF1
LPF0
Input Sampling Frequency (MHz)
00
20
01
40
1
0
160
1
160
A simple LC anti-aliasing lter is recommended at the
lter inputs to attenuate frequencies near the input sam-
pling frequency that will be aliased to the passband. For
example, if the clock frequency is set to 80MHz and the
cutoff frequency of the lter is set to its maximum (LPF1
= 1), the lowest frequency that would be aliased to the
passband would be fCLK – fCUTOFF, i.e., 160MHz – 2.5MHz
= 157.5MHz. The LTC6603 lter inputs should be driven
by a low impedance output (<100Ω).
Wideband Noise
The wideband noise of the lter is the RMS value of the
device’s output noise spectral density. The wideband noise
is nearly independent of the value of the clock frequency
and excludes the clock feedthrough. Most of the wideband
noise is concentrated in the lter passband and cannot be
removed with post ltering.
Power Supply Current
The power supply current depends on the state of the
lowpass cutoff frequency controls (LPF1, LPF0) and the
value of RBIAS. When the LTC6603 is programmed for the
middle cutoff frequency (LPF1 = 0, LPF0 = 1), the supply
current is reduced by about 23% relative to the supply
current for the higher bandwidth setting. Programming
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6603CUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Adjustable Lowpass Filter |
| LTC6603IUF#PBF | 功能描述:IC FILTER LOWPASS 24-QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 滤波器 - 有源 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1,000 系列:- 滤波器类型:连续时间，带通低通 频率 - 截止或中心:150kHz 滤波器数:4 滤波器阶数:8th 电源电压:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) |
| LTC6603IUF#TRPBF | 功能描述:IC FILTER LOWPASS 24-QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 滤波器 - 有源 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1,000 系列:- 滤波器类型:连续时间，带通低通 频率 - 截止或中心:150kHz 滤波器数:4 滤波器阶数:8th 电源电压:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) |
| LTC6603IUF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Adjustable Lowpass Filter |
| LTC6603IUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Adjustable Lowpass Filter |
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