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LTC1562CG-2#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
4
LTC1562-2
15622fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Peak BP Gain vs Nominal f
O
(V
S
= ±5V) (Figure 3, V1 Output)
Q Error vs Nominal f
O
(V
S
= ±2.5V)
Peak BP Gain vs Nominal f
O
(V
S
= ±2.5V) (Figure 3, V1 Output)
NOMINAL f
O
(kHz)
100
Q ERROR (%)
55
50
45
40
35
30
25
20
15
10
5
0
–5
260
1562-2 G04
140 180 220 300240120 160 200 280
Q = 5
Q = 2.5
Q = 1
T
A
= 70°C
T
A
= 25°C
R
IN
= R
Q
NOMINAL f
O
(kHz)
100
PEAK BP GAIN (dB)
0.25
0
0.50
1.00
3.00
2.00
140
180
200 280
2.50
1.50
0.75
1.25
2.25
2.75
1.75
120 160
220
240
260
300
1562-2 G5
Q = 5
Q = 2.5
Q = 1
T
A
= 70°C
T
A
= 25°C
R
IN
= R
Q
NOMINAL f
O
(kHz)
100
PEAK BP GAIN (dB)
0.25
0
0.50
1.00
3.00
2.00
140
180
200 280
2.50
1.50
0.75
1.25
2.25
2.75
4.00
3.50
3.25
3.75
1.75
120 160
220
240
260
300
1562-2 G6
Q = 5
Q = 2.5
Q = 1
T
A
= 70°C
T
A
= 25°C
R
IN
= R
Q
LP Noise vs Nominal f
O
(V
S
= ±5V, 25°C) (Figure 3,
V2 Output) (R
IN
= R2)
NOMINAL f
O
(kHz)
120
10
LP NOISE (µV
RMS
)
30
60
70
80
90
100
160
200
220
1562-2 G07
20
50
40
140 180
240
260
280
Q = 5
Q = 2.5
Q = 1
BP Noise vs Nominal f
O
(V
S
= ±5V, 25°C) (Figure 3,
V1 Output) (R
IN
= R
Q
)
NOMINAL f
O
(kHz)
120
10
BP NOISE (µV
RMS
)
30
60
70
80
90
100
160
200
220
1562-2 G08
20
50
40
140 180
240
260
280
Q = 5
Q = 2.5
Q = 1
PIN FUNCTIONS
UUU
Distortion vs External Load
Resistance and Frequency
(V
S
= ±5V, 25°C) (Figure 8)
EXTERNAL LOAD RESISTANCE (Ω)
10k
–100
THD (AMPLITUDE BELOW FUNDAMENTAL) (dB)
THD (AMPLITUDE BELOW FUNDAMENTAL) (%)
–80
–70
–60
–50
–40
–30
5k
2k
1562-2 G09
–20
–10
0
0.001
0.01
0.1
1
10
100
–90
1k
f
IN
= 20kHz
f
IN
= 50kHz
2nd ORDER LOWPASS
f
O
= 200kHz
Q = 0.7
OUTPUT LEVEL 1V
RMS
(2.83V
P-P
)
±5V SUPPLIES
f
IN
= 100kHz
Power Supply Pins: The V
+
and V
–
pins should be
bypassed with 0.1µF capacitors to an adequate analog
ground or ground plane. These capacitors should be
connected as closely as possible to the supply pins. Pins
4, 7, 14 and 17 are internally connected to V
–
(Pin 16) and
should also be tied to the same point as Pin 16 for best
shielding. Low noise linear supplies are recommended.
Switching supplies are not recommended as they will
lower the filter dynamic range.
Analog Ground (AGND): The AGND pin is the midpoint of
a resistive voltage divider, developing a potential halfway
between the V
+
and V
–
pins, with an equivalent series
resistance nominally 7k. This serves as an internal ground
reference. Filter performance will reflect the quality of the
analog signal ground and an analog ground plane
surrounding the package is recommended. The analog
ground plane should be connected to any digital ground at
a single point. For dual supply operation, the AGND pin
5
LTC1562-2
15622fa
PIN FUNCTIONS
UUU
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.
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).
0.1µF
V
–
1562-2 F01
DIGITAL
GROUND PLANE
(IF ANY)
V
+
LTC1562-2
0.1µF
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)
1µF
1562-2 F01
DIGITAL
GROUND PLANE
(IF ANY)
V
+
LTC1562-2
V
+
/2
REFERENCE
0.1µF
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
7958Ω
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)
6
LTC1562-2
15622fa
V
+
V
–
SHDN
1562-2 BD
2ND ORDER SECTIONS
R
R
INV V1 V2
C
SHUTDOWN
SWITCH
SHUTDOWN
SWITCH
AGND
V
+
V
–
–
+
INV V1 V2
INV V1 V2 INV V1 V2
C
CC
AB
DC
–
+
–
+
–
+
∫∫
∫∫
BLOCK DIAGRA
W
PIN FUNCTIONS
UUU
INV A, INV B, INV C, INV D: Each of the INV pins is a virtual-
ground summing point for the corresponding 2nd order
section. For each section, all three external components
Z
IN
, R2, R
Q
connect to the INV pin as shown in Figure 3 and
described further in the Applications Information. Note
that the INV pins are sensitive internal nodes of the filter
and will readily receive any unintended signals that are
capacitively coupled into them. Capacitance to the INV
nodes will also affect the frequency response of the filter
sections. For these reasons, printed circuit connections to
the INV pins must be kept as short as possible, less than
one inch (2.5cm) total and surrounded by a ground plane.
V1 A, V1 B, V1 C, V1 D: Output Pins. Provide a bandpass,
highpass or other response depending on external cir-
cuitry (see Applications Information section). Each V1 pin
also connects to the R
Q
resistor of the corresponding 2nd
order filter section (see Figure 3 and Applications Informa-
tion). Each output is designed to drive a nominal net load
of 4kΩ and 30pF, which includes the loading due to the
external R
Q
. Distortion performance improves when the
outputs are loaded as lightly as possible.
V2 A, V2 B, V2 C, V2 D: Output Pins. Provide a lowpass,
bandpass or other response depending on external cir-
cuitry (see Applications Information section). Each V2 pin
also connects to the R2 resistor of the corresponding 2nd
order filter section (see Figure 3 and Applications Informa-
tion). Each output is designed to drive a nominal net load
of 4kΩ and 30pF, which includes the loading due to the
external R2. Distortion performance improves when the
outputs are loaded as lightly as possible.
Overall Block Diagram Showing Four 3-Terminal 2nd Order Sections
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC1562CG-2#TRPBF

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Buy LTC1562CG-2#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Active Filter Active RC Quad Universal Filter
Lifecycle:
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