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參數(shù)資料
| 型號： | LTC6603CUF#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FILTER LOWPASS 24-QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 濾波器類型： | 低通 |
| 頻率 - 截止或中心： | 80MHz |
| 濾波器數(shù)： | 2 |
| 濾波器階數(shù)： | 9th |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 24-QFN 裸露焊盤（4x4） |
| 包裝： | 帶卷 (TR) |
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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| LTC6603IUF#TRPBF | 功能描述:IC FILTER LOWPASS 24-QFN RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時(shí)間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
| LTC6603IUF-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Adjustable Lowpass Filter |
| LTC6603IUF-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Adjustable Lowpass Filter |
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