LTC1562 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1562' PDF : 28 Pages View PDF
LTC1562
PIN FUNCTIONS
(Figure 1). For single supply operation, the AGND pin
should be bypassed to the ground plane with at least a
0.1µF capacitor (at least 1µF for best AC performance)
(Figure 2).
ANALOG
GROUND
PLANE
V+
0.1µF
1
20
2
19
3
18
4
17
5
LTC1562
16
6
15
7
14
8
13
9
12
10
11
V–
0.1µF
SINGLE-POINT
SYSTEM GROUND
DIGITAL
GROUND PLANE
(IF ANY)
1562 F01
Figure 1. Dual Supply Ground Plane Connection
(Including Substrate Pins 4, 7, 14, 17)
ANALOG
GROUND
PLANE
V+
0.1µF
1
20
2
19
3
18
4
17
5
LTC1562
16
6
15
7
14
1µF
8
13
9
12
10
11
V +/2
REFERENCE
SINGLE-POINT
SYSTEM GROUND
DIGITAL
GROUND PLANE
(IF ANY)
1562 F01
Figure 2. Single Supply Ground Plane Connection
(Including Substrate Pins 4, 7, 14, 17)
Shutdown (SHDN): When the SHDN input goes high or is
open-circuited, the LTC1562 enters a “zero-power” shut-
down state and only junction leakage currents flow. The
AGND pin and the amplifier outputs (see Figure 3) assume
a high impedance state and the amplifiers effectively
disappear from the circuit. (If an input signal is applied to
a complete filter circuit while the LTC1562 is in shutdown,
some signal will normally flow to the output through
passive components around the inactive op amps.)
A small pull-up current source at the SHDN input defaults
the LTC1562 to the shutdown state if the SHDN pin is left
floating. Therefore, the user must connect the SHDN pin
to a logic “low” (0V for ±5V supplies, V – for 5V total
supply) for normal operation of the LTC1562. (This con-
vention permits true “zero-power” shutdown since not
even the driving logic must deliver current while the part
is in shutdown.) With a single supply voltage, use V – for
logic “low”— do not connect SHDN to the AGND pin.
1/4 LTC1562
1
sR1C*
*R1 AND C ARE PRECISION
INTERNAL COMPONENTS
C
–
+
V2
R2
INV
RQ
ZIN
+– VIN
V1
1562 F01
ZIN TYPE
R
C
RESPONSE
AT V1
BANDPASS
HIGHPASS
RESPONSE
AT V2
LOWPASS
BANDPASS
IN EACH CASE,
( ) fO = (100kHz)
10kΩ
R2
( ) Q =
RQ
R2
100kHz
fO
Figure 3. Equivalent Circuit of a Single 2nd Order Section
(Inside Dashed Line) Shown in Typical Connection. Form of ZIN
Determines Response Types at the Two Outputs (See Table)
5
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