Datasheet
3
LTC1264
1264fb
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Offset Voltage (Note 3) V
OS1
(DC Offset of Input Inverter) ● ±20 mV
V
OS2
(DC Offset of First Integrator) ● ±45 mV
V
OS3
(DC Offset of Second Integrator) ● ±45 mV
Clock Feedthrough V
S
= ±7.5V (f
CLK
is a Square Wave) 160 µV
RMS
V
S
= ±5V (f
CLK
is a Square Wave) 120 µV
RMS
V
S
= ±2.375V (f
CLK
is a Square Wave) 90 µV
RMS
Maximum Clock Frequency V
S
= ±7.5V, T
A
= 25°C 6 MHz
Power Supply Current V
S
= ±5V 9 14 23 mA
● 26 mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Please refer to Typical Maximum Q vs Clock Frequency graphs.
Note 3: Calculations of output DC offsets of one 2nd order section. Also
see Block Diagram.
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Typical Maximum Q
vs Clock Frequency
Typical Maximum Q
vs Clock Frequency
Typical Maximum Q
vs Clock Frequency
f
O
(measured) – f
O
(ideal)
f
O
(ideal)
V
OSN
V
OSBP
V
OSLP
MODE PINS 2, 11, 14, 23 PINS 3, 10, 15, 22 PINS 4, 9, 16, 21
1V
OS1
[(1Q) + 1 ||H
OLP
||] – 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)] V
OS3
V
OSN
– V
OS2
• [R4/(R2 + R4)] + V
OS2
[R2/(R2 + R4)]
3V
OS2
V
OS3
V
OS1
[1 + R4/R1 + R4/R2 + R4/R3] – V
OS2
(R4/R2)
– V
OS3
(R4/R3)
Note 4: The center frequency f
O
, error is calculated as:
CLOCK FREQUENCY (MHz)
1.5
TYPICAL MAXIMUM Q
26
24
22
20
18
16
14
12
10
8
6
4
2
0
2.5
3.5
4.0
1264 G01
2.0
3.0
4.5
5.0
V
S
= ±7.5V
T
A
≤ 85°C
A
B
A. MODES 1, 1b
B. MODES 3, 3a
CLOCK FREQUENCY (MHz)
1.0
TYPICAL MAXIMUM Q
26
24
22
20
18
16
14
12
10
8
6
4
2
0
2.0
3.0
3.5
1264 G02
1.5
2.5
4.0
V
S
= ±5V
T
A
≤ 85°C
A
B
A. MODES 1, 1b
B. MODES 3, 3a
CLOCK FREQUENCY (MHz)
1.0
TYPICAL MAXIMUM Q
20
18
16
14
12
10
8
6
4
2
0
1.8
1264 G03
1.2
1.4
1.6
2.0
B
A
V
S
= SINGLE 5V
T
A
≤ 85°C
A. MODES 1, 1b
B. MODES 3, 3a
• 100
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Complete Filter) V
S
= ±5V, f
CLK
= 1MHz, all sides mode 1, f
O
= 50kHz,
Q = 5, unless otherwise noted.