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參數資料
| 型號： | LTC1562I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Advanced LinEPIC Self-Calibrating Precision Dual Operational Amplifier 8-CDIP -55 to 125 |
| 中文描述： | 非常低噪聲，低失真有源RC四通用濾波器 |
| 文件頁數： | 5/16頁 |
| 文件大?。?/td> | 179K |
| 代理商： | LTC1562I |
5
LTC1562-2
PI
FU
CTIO
N
S
U
U
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 0.1
μ
F capacitor (at least
1
μ
F for best AC performance) (Figure 2).
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 f the SHDN pin s eft
floating Therefore, the user mustconnect the SHDN pin
to a logic “l(fā)ow” (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 “l(fā)ow,” do not connect SHDN to the AGND pin.
0.1
μ
F
V
–
1562-2 F01
DIGITAL
GROUND PLANE
(IF ANY)
V
+
0.1
μ
F
LTC1562-2
ANALOG
GROUND
PLANE
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
SINGLE-POINT
SYSTEM GROUND
Figure 1. Dual Supply Ground Plane Connection
(Including Substrate Pins 4, 7, 14, 17)
1
μ
F
1562-2 F01
DIGITAL
GROUND PLANE
(IF ANY)
V
+
0.1
μ
F
LTC1562-2
V
+
/2
REFERENCE
ANALOG
GROUND
PLANE
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
SINGLE-POINT
SYSTEM GROUND
Figure 2. Single Supply Ground Plane Connection
(Including Substrate Pins 4, 7, 14, 17)
–
+
+
R2
R
Q
V
IN
INV
*R1 AND C ARE PRECISION
INTERNAL COMPONENTS
V2
V1
1/4 LTC1562-2
1562-2 F03
C
1
sR1C*
Z
IN
Z
IN
TYPE
R
C
RESPONSE
AT V1
BANDPASS
HIGHPASS
RESPONSE
AT V2
LOWPASS
BANDPASS
7958
R2
IN EACH CASE,
Q =
f
O
= (200kHz)
RQ
R2
(
)
200kHz
f
O
(
)
Figure 3. Equivalent Circuit of a Single 2nd Order Section
(Inside Dashed Line) Shown in Typical Connection. Form of
Z
IN
Determines Response Types at the Two Outputs (See Table)
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