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参数资料
| 型号： | LTC1562AIG#TR |
| 厂商： | Linear Technology |
| 文件页数： | 28/28页 |
| 文件大小： | 0K |
| 描述： | IC FILTER UNIV RC QUAD LN 20SSOP |
| 标准包装： | 1,800 |
| 滤波器类型： | 通用连续计时 |
| 频率 - 截止或中心： | 150kHz |
| 滤波器数： | 4 |
| 滤波器阶数： | 8th |
| 电源电压： | 4.75 V ~ 10.5 V，±4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
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9
LTC1562
1562fa
APPLICATIONS INFORMATION
WU
U
Parameters
ωO = 2πfO and Q are set by R2 and RQ as
above. The highpass gain parameter is HH = CIN/159pF.
For a 2nd order highpass response the gain magnitude at
frequency fO is QHH, and approaches HH at high frequen-
cies (f >> fO). For Q > 0.707, a gain peak occurs at a
frequency above fO as shown in Figure 4. The transfer
function includes a sign inversion.
at frequency fO, and for Q > 0.707, a gain peak occurs at
a frequency below fO, as shown in Figure 4.
Basic Bandpass
There are two different ways to obtain a bandpass function
in Figure 3, both of which give the following transfer
function form:
Hs
HQ s
sQ s
BP
BO
OO
()
–/
/
=
()
+
() +
ω
ωω
2
ωO = 2πfO and Q are set by R2 and RQ as described previ-
ously in Setting fO and Q. When ZIN is a resistor of value
RIN, a bandpass response results at the V1 output (Figure
6a) with a gain parameter HB = RQ/RIN. Alternatively, a
capacitor of value CIN gives a bandpass response at the V2
output (Figure 6b), with the same HBP(s) expression, and
the gain parameter now HB = (RQ/10k)(CIN/159pF). This
transfer function has a gain magnitude of HB (itspeakvalue)
when the frequency equals fO and has a phase shift of 180°
at that frequency. Q measures the sharpness of the peak
(the ratio of fO to – 3dB bandwidth) in a 2nd order band-
pass function, as illustrated in Figure 4.
INV
V1
2nd ORDER
1/4 LTC1562
(b) Capacitive Input
(a) Resistive Input
V2
1562 F06
R2
RQ
CIN
VIN
VOUT
INV
V1
2nd ORDER
1/4 LTC1562
V2
R2
RQ
RIN
VIN
VOUT
Figure 6. Basic Bandpass Configurations
Basic Highpass
When ZIN of Figure 3 is a capacitor of value CIN, a highpass
response appears at the V1 output (Figure 7).
Vs
Hs
sQ s
IN
HP
H
OO
1
2
()
–
/
==
+
() +
ωω
INV
V1
2nd ORDER
1/4 LTC1562
V2
1562 F07
R2
RQ
CIN
VIN
VOUT
Figure 7. Basic Highpass Configuration
Signal Swings
The V1 and V2 outputs are capable of swinging to within
roughly 100mV of each power supply rail. As with any
analog filter, the signal swings in each 2nd order section
must be scaled so that no output overloads (saturates),
even if it is not used as a signal output. (Filter literature
often calls this the “dynamics” issue.) When an unused
output has a larger swing than the output of interest, the
section’s gain or input amplitude must be scaled down to
avoid overdriving the unused output. The LTC1562 can
still be used with high performance in such situations as
long as this constraint is followed.
For an LTC1562 section as in Figure 3, the magnitudes of
the two outputs V2 and V1, at a frequency
ω = 2πf, have
the ratio,
|(
) |
|(
) |
()
Vj
kHz
f
2
1
100
ω
=
regardless of the details of ZIN. Therefore, an input fre-
quency above or below 100kHz produces larger output
amplitude at V1 or V2, respectively. This relationship can
guide the choice of filter design for maximum dynamic
range in situations (such as bandpass responses) where
there is more than one way to achieve the desired fre-
quency response with an LTC1562 section.
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