Datasheet
4
LTC1562
1562fa
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)
NOMINAL f
O
(kHz)
50
Q ERROR (%)
35
30
25
20
15
10
5
0
–5
130
1562 G04
70 90 110 15012060 80 100 140
Q = 10
Q = 5
Q = 2.5
Q = 1
T
A
= 70°C
T
A
= 25°C
R
IN
= R
Q
NOMINAL f
O
(kHz)
50
–0.5
PEAK BP GAIN (dB)
0
0.5
1.0
3.0
2.0
70
90
100 140
2.5
1.5
60 80
110
120
130
150
1562 G5
Q = 10
Q = 5
Q = 2.5
Q = 1
T
A
= 70°C
T
A
= 25°C
R
IN
= R
Q
NOMINAL f
O
(kHz)
50
–0.5
PEAK BP GAIN (dB)
0
0.5
1.0
3.0
2.0
70
90
100 140
2.5
1.5
60 80
110
120
130
150
1562 G6
Q = 10
Q = 5
Q = 2.5
Q = 1
T
A
= 70°C
T
A
= 25°C
R
IN
= R
Q
Peak BP Gain vs Nominal f
O
(V
S
= ±2.5V) (Figure 3, V1 Output)
Distortion vs External Load
Resistance (V
S
= ±5V, 25°C)
(Figure 8)
EXTERNAL LOAD RESISTANCE (Ω)
10k
–100
THD (AMPLITUDE BELOW FUNDAMENTAL) (dB)
–80
–70
–60
–50
–40
–30
5k
2k
1562 G09
–20
–10
0
–90
1k
f
IN
= 50kHz
f
IN
= 20kHz
2nd ORDER LOWPASS
f
O
= 100kHz
Q = 0.7
OUTPUT LEVEL 1V
RMS
(2.83V
P-P
)
±5V SUPPLIES
LP Noise vs Nominal f
O
(V
S
= ±5V, 25°C) (Figure 3,
V2 Output) (R
IN
= R2)
NOMINAL f
O
(kHz)
60
10
BP NOISE (µV
RMS
)
15
25
30
35
60
45
80
100
110
1562 G08
20
50
55
40
70 90
120
130
140
Q = 5
Q = 2.5
Q = 1
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. In the
20-lead SSOP package, the additional 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 sup-
plies are not recommended as they will lower the filter
dynamic range.
Analog Ground (AGND): The AGND pin is the midpoint of
an internal resistive voltage divider, developing a potential
halfway between the V
+
and V
–
pins, with an equivalent
series resistance nominally 7kΩ. This serves as an inter-
nal 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 should be connected to the ground plane
BP Noise vs Nominal f
O
(V
S
= ±5V, 25°C) (Figure 3,
V1 Output) (R
IN
= R
Q
)
NOMINAL f
O
(kHz)
60
10
NOISE (µV
RMS
)
15
25
30
35
60
45
80
100
110
1562 G07
20
50
55
40
70 90
120
130
140
Q = 5
Q = 2.5
Q = 1
UU
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PI FU CTIO S