Datasheet
LTC1068 Series
7
1068fc
ELECTRICAL CHARACTERISTICS
LTC1068
Maximum Q vs Center Frequency
(Modes 1, 1b, 2)
LTC1068
Maximum Q vs Center Frequency
(Modes 2, 3)
LTC1068-200
Maximum Q vs Center Frequency
(Modes 1, 1b, 2)
Table 1. Output DC Offsets One 2nd Order Section
MODE V
OSN
V
OSBP
V
OSLP
1 V
OS1
[(1/Q) + 1 + ||HOLP||] – V
OS3
/Q V
OS3
V
OSN
– V
OS2
1b V
OS1
[(1/Q) + 1 + R2/R1] – V
OS3
/Q V
OS3
~(V
OSN
– V
OS2
)(1 + R5/R6)
2 [V
OS1
(1 + R2/R1 + R2/R3 + R2/R4) – V
OS3
(R2/R3)X
[R4/(R2 + R4)] + V
OS2
[R2/(R2 + R4)]
V
OS3
V
OSN
– V
OS2
3 V
OS2
V
OS3
V
OS1
[1 + R4/R1 + R4/R2 + R4/R3] – V
OS2
(R4/R2) – V
OS3
(R4/R3)
TYPICAL PERFORMANCE CHARACTERISTICS
CENTER FREQUENCY, f
O
(kHz)
0
A B C
0
MAXIMUM Q
5
15
20
25
50
35
20
40
50
1068 G01
10
40
45
30
10
30
60
70
A. V
S
= 3.3V, f
CLK(MAX)
= 1.5MHz
B. V
S
= 5V, f
CLK(MAX)
= 3.4MHz
C. V
S
= ±5V, f
CLK(MAX)
= 5.6MHz
(FOR MODE 2 R4 ≥ 10R2)
CENTER FREQUENCY, f
O
(kHz)
0
A B C
0
MAXIMUM Q
5
15
20
25
50
35
20
40
50
1068 G02
10
40
45
30
10
30
60
A. V
S
= 3.3V, f
CLK(MAX)
= 1MHz
B. V
S
= 5V, f
CLK(MAX)
= 3MHz
C. V
S
= ±5V, f
CLK(MAX)
= 5MHz
(FOR MODE 2 R4 < 10R2)
CENTER FREQUENCY, f
O
(kHz)
0
A
B C
55
50
45
40
35
30
25
20
15
10
5
0
TYPICAL MAXIMUM Q
8
16
20 24
1068 G03
4
12
28
32
A: V
S
= 3.3V, f
CLK(MAX)
= 1.2MHz
B: V
S
= 5V, f
CLK(MAX)
= 3.2MHz
C: V
S
= ±5V, f
CLK(MAX)
= 6.1MHz
(FOR MODE 2, R4 ≥ 10R2)
LTC1068-200
Maximum Q vs Center Frequency
(Modes 2, 3)
LTC1068-50
Maximum Q vs Center Frequency
(Modes 1, 1b, 2)
LTC1068-50
Maximum Q vs Center Frequency
(Modes 2, 3)
CENTER FREQUENCY, f
O
(kHz)
0
A
B C
55
50
45
40
35
30
25
20
15
10
5
0
TYPICAL MAXIMUM Q
8
16
20 24
1068 G04
4
12
28
32
A: V
S
= 3.3V, f
CLK(MAX)
= 1.2MHz
B: V
S
= 5V, f
CLK(MAX)
= 3.2MHz
C: V
S
= ±5V, f
CLK(MAX)
= 6.1MHz
(FOR MODE 2, R4 < 10R2)
CENTER FREQUENCY, f
O
(kHz)
0
A
B
C
55
50
45
40
35
30
25
20
15
10
5
0
TYPICAL MAXIMUM Q
8
16
20 24
1068 G05
4
12
28
32
A: V
S
= 3.3V, f
CLK(MAX)
= 1.1MHz
B: V
S
= 5V, f
CLK(MAX)
= 2.1MHz
C: V
S
= ±5V, f
CLK(MAX)
= 3.6MHz
(FOR MODE 2, R4 ≥ 10R2)
CENTER FREQUENCY, f
O
(kHz)
0
A
B
C
55
50
45
40
35
30
25
20
15
10
5
0
TYPICAL MAXIMUM Q
8
16
20 24
1068 G06
4
12
28
32
A: V
S
= 3.3V, f
CLK(MAX)
= 1.1MHz
B: V
S
= 5V, f
CLK(MAX)
= 2.1MHz
C: V
S
= ±5V, f
CLK(MAX)
= 3.6MHz
(FOR MODE 2, R4 < 10R2)