LTC1562-2 Linear Technology, LTC1562-2 Datasheet - Page 4

• Manufacturer Part Number: LTC1562-2
• Description: Very Low Noise/ Low Distortion Active RC Quad Universal Filter
• Manufacturer: Linear Technology

PIN
LTC1562-2
TYPICAL PERFOR A CE CHARACTERISTICS
Power Supply Pins: The V
bypassed with 0.1 F 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
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.
4
100
40
10
90
80
70
60
50
30
20
– 5
U
55
50
45
40
35
30
25
20
15
10
5
0
120
100
Q Error vs Nominal f
LP Noise vs Nominal f
(V
V2 Output) (R
R
FUNCTIONS
S
120
IN
140
= 5V, 25 C) (Figure 3,
= R
140
U
Q
160
T
T
A
A
160
= 70 C
= 25 C
NOMINAL f
NOMINAL f
180
180
IN
Q = 2.5
Q = 5
Q = 1
200 220
= R2)
200
U
O
O
220
(kHz)
O
(kHz)
Q = 2.5
Q = 5
(V
O
240
Q = 1
S
240 260 280
W
= 2.5V)
260
+
1562-2 G07
280
1562-2 G04
and V
U
300
–
100
40
90
80
70
60
50
30
20
10
pins should be
120
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
BP Noise vs Nominal f
(V
V1 Output) (R
–
0
S
(Pin 16) and
100
140
Peak BP Gain vs Nominal f
(V
= 5V, 25 C) (Figure 3,
R
S
120
IN
160
= 5V) (Figure 3, V1 Output)
= R
140
NOMINAL f
Q
T
T
180
A
A
160
= 70 C
= 25 C
IN
NOMINAL f
Q = 2.5
Q = 5
Q = 1
200 220
= R
180 200
O
Q
(kHz)
)
Analog Ground (AGND): The AGND pin is the midpoint of
a resistive voltage divider, developing a potential halfway
between the V
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
O
O
220 240 260
Q = 2.5
(kHz)
240 260 280
Q = 5
Q = 1
1562-2 G08
O
280
1562-2 G5
300
+
–100
– 40
– 60
–10
–20
–30
– 50
–70
– 80
– 90
and V
0
10k
Distortion vs External Load
Resistance and Frequency
(V
2nd ORDER LOWPASS
f
Q = 0.7
OUTPUT LEVEL 1V
O
S
4.00
3.75
3.50
3.25
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
5V SUPPLIES
0.25
= 200kHz
–
= 5V, 25 C) (Figure 8)
EXTERNAL LOAD RESISTANCE ( )
0
100
pins, with an equivalent series
Peak BP Gain vs Nominal f
(V
R
120
S
IN
= 2.5V) (Figure 3, V1 Output)
= R
5k
140
f
IN
f
f
Q
T
T
IN
IN
A
A
RMS
= 100kHz
= 50kHz
= 20kHz
160
= 70 C
= 25 C
NOMINAL f
(2.83V
180 200
2k
P-P
O
)
220 240 260
(kHz)
Q = 2.5
Q = 1
Q = 5
1562-2 G09
O
1k
100
10
1
0.1
0.01
0.001
280
1562-2 G6
300