LTC1562-2 데이터 시트보기 (PDF) - Linear Technology
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LTC1562-2 Datasheet PDF : 16 Pages
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LTC1562-2
PIN FUNCTIONS
should be connected to the ground plane (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
16
LTC1562-2
6
15
7
14
8
13
9
12
10
11
V–
0.1µF
SINGLE-POINT
SYSTEM GROUND
DIGITAL
GROUND PLANE
(IF ANY)
1562-2 F01
Figure 1. Dual Supply Ground Plane Connection
(Including Substrate Pins 4, 7, 14, 17)
Shutdown (SHDN): When the SHDN input goes high or is
open-circuited, the LTC1562-2 enters a “zero-power”
shutdown 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 effec-
tively disappear from the circuit. (If an input signal is
applied to a complete filter circuit while the LTC1562-2 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 LTC1562-2 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 LTC1562-2. (This
convention 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 LTC1562-2
1
sR1C*
*R1 AND C ARE PRECISION
INTERNAL COMPONENTS
C
ANALOG
GROUND
PLANE
V+
0.1µF
1
20
2
19
3
18
4
17
5
16
LTC1562-2
6
15
7
14
1µF
8
13
9
12
10
11
V +/2
REFERENCE
SINGLE-POINT
SYSTEM GROUND
DIGITAL
GROUND PLANE
(IF ANY)
1562-2 F01
Figure 2. Single Supply Ground Plane Connection
(Including Substrate Pins 4, 7, 14, 17)
–
+
V2
R2
INV
V1
RQ
ZIN
+– VIN
ZIN TYPE
R
C
RESPONSE
AT V1
BANDPASS
HIGHPASS
RESPONSE
AT V2
LOWPASS
BANDPASS
IN EACH CASE,
( ) fO = (200kHz)
7958Ω
R2
( ) Q
=
RQ
R2
200kHz
fO
1562-2 F03
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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