LTC1562 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1562' PDF : 28 Pages View PDF
LTC1562
TYPICAL PERFOR A CE CHARACTERISTICS
Q Error vs Nominal fO (VS = ±2.5V)
35
TA = 70°C
30
TA = 25°C
RIN = RQ
25
Q = 10
20
Q=5
15
10
Q = 2.5
5
0
Q=1
–5
50 60 70 80 90 100 110 120 130 140 150
NOMINAL fO (kHz)
1562 G04
LP Noise vs Nominal fO
(VS = ±5V, 25°C) (Figure 3,
V2 Output) (RIN = R2)
60
55
50
45
Q=5
40
35
Q = 2.5
30
25
Q=1
20
15
10
60 70 80 90 100 110 120 130 140
NOMINAL fO (kHz)
1562 G07
Peak BP Gain vs Nominal fO
(VS = ±5V) (Figure 3, V1 Output)
3.0
TA = 70°C
2.5
TA = 25°C
RIN = RQ
Q = 10
2.0
1.5
Q=5
1.0
Q = 2.5
0.5
0
Q=1
– 0.5
50 60 70 80 90 100 110 120 130 140 150
NOMINAL fO (kHz)
1562 G5
BP Noise vs Nominal fO
(VS = ±5V, 25°C) (Figure 3,
V1 Output) (RIN = RQ)
60
55
50
45
Q=5
40
35
30
Q = 2.5
25
20
Q=1
15
10
60 70 80 90 100 110 120 130 140
NOMINAL fO (kHz)
1562 G08
Peak BP Gain vs Nominal fO
(VS = ±2.5V) (Figure 3, V1 Output)
3.0
TA = 70°C
2.5
TA = 25°C
RIN = RQ
Q = 10
2.0
1.5
Q=5
1.0
Q = 2.5
0.5
0
Q=1
– 0.5
50 60 70 80 90 100 110 120 130 140 150
NOMINAL fO (kHz)
1562 G6
Distortion vs External Load
Resistance (VS = ±5V, 25°C)
(Figure 8)
0
2nd ORDER LOWPASS
–10 fO = 100kHz
Q = 0.7
–20 OUTPUT LEVEL 1VRMS (2.83VP-P)
–30 ± 5V SUPPLIES
– 40
– 50
– 60
– 70
– 80
fIN = 50kHz
– 90
fIN = 20kHz
–100
10k
5k
2k
1k
EXTERNAL LOAD RESISTANCE (Ω)
1562 G09
PIN FUNCTIONS
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
4
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