PIN FUNCTIO
參數(shù)資料
型號: LTC1562AIG#TR
廠商: Linear Technology
文件頁數(shù): 24/28頁
文件大?。?/td> 0K
描述: IC FILTER UNIV RC QUAD LN 20SSOP
標(biāo)準(zhǔn)包裝: 1,800
濾波器類型: 通用連續(xù)計時
頻率 - 截止或中心: 150kHz
濾波器數(shù): 4
濾波器階數(shù): 8th
電源電壓: 4.75 V ~ 10.5 V,±4.75 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 20-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 20-SSOP
包裝: 帶卷 (TR)
5
LTC1562
1562fa
PIN FUNCTIONS
UU
U
package does not have the four substrate pins (Pins 4, 7,
14, 17 in the 20-pin package).
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 “l(fā)ow” (0V for
±5V supplies, Vfor 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 “l(fā)ow”— do not connect SHDN to the AGND pin.
(Figure 1). For single supply operation, the AGND pin
should be bypassed to the ground plane with at least a
0.1
F capacitor (at least 1F for best AC performance)
(Figure 2). These figures show 20-pin package connec-
tions. The same principles apply to the 16-pin package
with allowance for its different pin numbers. The 16-pin
Figure 1. Dual Supply Ground Plane Connection
(Including Substrate Pins 4, 7, 14, 17)
0.1
F
V
1562 F01
DIGITAL
GROUND PLANE
(IF ANY)
V+
LTC1562
20-PIN SSOP
0.1
F
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
1
F
1562 F01
DIGITAL
GROUND PLANE
(IF ANY)
V+
LTC1562
20-PIN SSOP
V+/2
REFERENCE
0.1
F
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
RQ
VIN
INV
*R1 AND C ARE PRECISION
INTERNAL COMPONENTS
V2
V1
1/4 LTC1562
1562 F01
C
1
sR1C*
ZIN
ZIN TYPE
R
C
RESPONSE
AT V1
BANDPASS
HIGHPASS
RESPONSE
AT V2
LOWPASS
BANDPASS
10k
R2
IN EACH CASE,
Q =
fO = (100kHz)
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)
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