LTC1562CG#PBF Linear Technology, LTC1562CG#PBF Datasheet - Page 12

• Manufacturer Part Number: LTC1562CG#PBF
• Description: IC FILTER UNIV RC QUAD LN 20SSOP
• Manufacturer: Linear Technology

Specifications of LTC1562CG#PBF

• Filter Type: Universal, Continuous-Time
• Frequency - Cutoff Or Center: 150kHz
• Number Of Filters: 4
• Max-order: 8th
• Voltage - Supply: 4.75 V ~ 10.5 V, ±4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS
LTC1562
This procedure can be iterated, adjusting the value of R
to find convenient values for C
values are generally available in finer increments than
capacitor values.
Different “f
Standard 2nd order filter algebra, as in Figure 4 and the
various transfer-function expressions in this data sheet,
uses a center frequency parameter f
2 f
ing:
• The frequency where a bandpass response has 180
• The frequency where a bandpass response has peak
• The geometric mean of the – 3.01dB gain frequencies in
An ideal mathematical 2nd order response yields exactly
the same frequency by these three measures. However,
real 2nd order filters with finite-bandwidth circuitry show
small differences between the practical f
which may be important in critical applications. The issue
is chiefly of concern in high-Q bandpass applications
where, as the data below illustrate, the different f
surements tend to converge anyway for the LTC1562. At
low Q the bandpass peak is not sharply defined and the
12
phase shift
gain
a bandpass (
O
). f
O
can also be measured in practical ways, includ-
O
” Measures
L H
U
in Figure 4)
INFORMATION
U
INA
and C
W
O
INB
(or
since resistor
O
O
measures,
U
, which is
0
mea-
T
,
– 3dB frequencies f
peak.
The LTC1562’s f
accurate 180 phase shift in the configuration of Figure
6a with resistor values setting f
Table 1 below shows typical differences between f
values measured via the bandpass 180 criterion and f
values measured using the two other methods listed
above (Figure 6a, R
Table 1
LTC1562 Demo Board
The LTC1562 demo board is assembled with an LTC1562
or LTC1562A in a 20-pin SSOP package and power supply
decoupling capacitors. Jumpers on the board configure
the LTC1562 for dual or single supply operation and power
shutdown. Pads for surface mount resistors and capaci-
tors are provided to build application-specific filters. Also
provided are terminals for inputs, outputs and power
supplies.
(BP 180 )
100kHz
140kHz
60kHz
f
O
BP-PEAK f
+ 0.3%
+ 0.6%
+ 0.8%
Q = 1
O
L
is trimmed in production to give an
IN
and f
O
= R
H
+ 0.3%
+ 0.6%
+ 0.8%
Q = 1
Q
are widely separated from this
L H
).
f
O
0
= 100kHz and Q = 1.
BP-PEAK f
+ 0.05%
+ 0.15%
+ 0.1%
Q = 5
O
+ 0.05%
+ 0.15%
+ 0.1%
Q = 5
L H
1562fa
f
O
O
O