LTC1068(RevA) データシートの表示（PDF） - Linear Technology
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LTC1068 Datasheet PDF : 28 Pages
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LTC1068 Series
ELECTRICAL CHARACTERISTICS LTC1068-25 (Complete Filter) VS = ±5V, TA = 25°V, unless otherwise noted.
PARAMETER
DC Offset Voltage (Note 5)
(See Table 1)
Clock Feedthrough
Max Clock Frequency (Note 6)
Power Supply Current
CONDITIONS
VS = ±5V, fCLK = 1MHz, VOS1
(DC Offset of Input Inverter)
VS = ±5V, fCLK = 1MHz, VOS2
(DC Offset of First Integrator)
VS = ±5V, fCLK = 1MHz, VOS3
(DC Offset of Second Integrator)
VS = ±5V, fCLK = 1MHz
VS = ±5V, Q ≤ 1.6, Mode 1
VS = 3.14V, fCLK = 1MHz (Note 2)
VS = 4.75V, fCLK = 1MHz (Note 3)
VS = ±5V, fCLK = 1MHz
MIN
q
q
q
q
q
q
TYP
MAX UNITS
0
±15
mV
–2
±25
mV
–5
±40
mV
0.25
mVRMS
5.6
MHz
3.5
8
mA
6.5
11
mA
9.5
15
mA
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Production testing for single 3.14V supply is achieved by
using the equivalent dual supplies of ±1.57V.
Note 3: Production testing for single 4.75V supply is achieved by
using the equivalent dual supplies of ±2.375V.
Note 4: Pin 7 (AGND) is the internal analog ground of the device. For
single supply applications this pin should be bypassed with a 1µF
capacitor. The biasing voltage of AGND is set with an internal resistive
divider from Pin 8 to Pin 23 (see Block Diagram).
Note 5: Side D is guaranteed by design.
Note 6: See Typical Performance Characteristics.
Table 1. Output DC Offsets One 2nd Order Section
MODE
1
1b
2
3
VOSN
VOS1[(1/Q) + 1 + ||HOLP||] – VOS3/Q
VOS1[(1/Q) + 1 + R2/R1] – VOS3/Q
[VOS1(1 + R2/R1 + R2/R3 + R2/R4) – VOS3(R2/R3)X
[R4/(R2 + R4)] + VOS2[R2/(R2 + R4)]
VOS2
VOSBP
VOS3
VOS3
VOS3
VOS3
VOSLP
VOSN – VOS2
~(VOSN – VOS2)(1 + R5/R6)
VOSN – VOS2
VOS1[1 + R4/R1 + R4/R2 + R4/R3] – VOS2(R4/R2) – VOS3(R4/R3)
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1068
Maximum Q vs Center Frequency
(Modes 1, 1b, 2)
50
45
A. VS = 3.3V, fCLK(MAX) = 1.5MHz
B. VS = 5V, fCLK(MAX) = 3.4MHz
40
C. VS = ± 5V, fCLK(MAX) = 5.6MHz
(FOR MODE 2 R4 ≥ 10R2)
35
30
25
20
15
10
5
A
B
C
0
0 10 20 30 40 50 60 70
CENTER FREQUENCY, fO (kHz)
1068 G01
6
LTC1068
Maximum Q vs Center Frequency
(Modes 2, 3)
50
45
A. VS = 3.3V, fCLK(MAX) = 1MHz
B. VS = 5V, fCLK(MAX) = 3MHz
40
C. VS = ± 5V, fCLK(MAX) = 5MHz
(FOR MODE 2 R4 < 10R2)
35
30
25
20
15
10
5
A
B
C
0
0 10 20 30 40 50 60
CENTER FREQUENCY, fO (kHz)
1068 G02
LTC1068-200
Maximum Q vs Center Frequency
(Modes 1, 1b, 2)
55
50
A: VS = 3.3V, fCLK(MAX) = 1.2MHz
B: VS = 5V, fCLK(MAX) = 3.2MHz
45
C: VS = ± 5V, fCLK(MAX) = 6.1MHz
40
(FOR MODE 2, R4 ≥ 10R2)
35
30
25
20
15
10
A
BC
5
0
0 4 8 12 16 20 24 28 32
CENTER FREQUENCY, fO (kHz)
1068 G03
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