参数资料
| 型号： | LTC6603CUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/24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
16
6603fa
APPLICATIONS INFORMATION
The following graphs show a few of the possible lowpass
lters.
Gain and Group Delay vs Frequency
(2.5MHz Lowpass Response)
Gain and Group Delay vs Frequency
(650kHz Lowpass Response)
The oscillator is sensitive to transients on the positive
supply. The IC should be soldered to the PC board and
the PCB layout should include a 0.1μF ceramic capacitor
between V+A (Pin 2) and ground, as close as possible to
the IC to minimize inductance. The PCB layout should also
include an additional 0.1μF ceramic capacitor between
V+D (Pin 16) and ground. Avoid parasitic capacitance on
RBIAS (Pin 4) and avoid routing noisy signals near RBIAS.
Use a ground plane connected to Pin 14 and the Exposed
Pad (Pin 25).
FREQUENCY (Hz)
GAIN
(dB)
GROUP
DELA
Y
(μs)
6603 G17
0
–20
–100
–80
–60
–40
–120
1.2
1.0
0.2
0.4
0.6
0.8
0
100k
10M
1M
GAIN
GROUP DELAY
FREQUENCY (Hz)
GAIN
(dB)
GROUP
DELA
Y
(μs)
6603 G18
0
–60
–40
–20
–80
1
2
3
4
0
100k
1M
GAIN
GROUP DELAY
Alternative Methods of Setting the Clock Frequency of
the LTC6603
The oscillator may be programmed by any method that
sinks a current out of the RBIAS pin. The circuit in Figure 6
sets the clock frequency by using a programmable current
source and in the expression for fCLK, the resistor RBIAS
is replaced by the ratio of 1.17V/ICONTROL. Because the
voltage of the RBIAS pin is approximately 1.17V ±5%, the
Figure 6 circuit is less accurate than if a resistor controls
the clock frequency.
In this circuit, the LTC2621 (a 12-bit DAC) is daisy-chained
with the LTC6603. Because the sinking current from the
RBIAS pin is:
V
RBIAS k
2
N R1
the equivalent RBIAS is:
2
N R1
k
,
where k is the binary DAC input code and N is the resolu-
tion. Figure 7 shows some of the frequency responses
that can be obtained using this circuit.
Figure 8 shows the LTC6603’s oscillator congured as
a VCO. A voltage source is connected in series with the
RBIAS resistor. The clock frequency, fCLK, will vary with
VCONTROL. Again, this circuit decouples the relationship
between the current out of the RBIAS pin and the voltage
of the RBIAS pin; the frequency accuracy will be degraded.
The clock frequency, however, will increase monotonically
with decreasing VCONTROL.
Operation Using an External Clock
The LTC6603 may be clocked by an external oscillator
for tighter bandwidth control by pulling CLKCNTL (Pin 5)
to ground and driving a clock into CLKIO (Pin 15). If an
external clock is used, the RBIAS resistor is still necessary.
The value of RBIAS must be no larger than the value that
would be required for using the internal oscillator. For
example, a 100k resistor would program the internal oscil-
lator for 24.705MHz, so an external oscillator frequency of
24.705MHz would require an RBIAS resistance of no more
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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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