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參數(shù)資料
| 型號(hào)： | LTC1264CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | High Speed, Quad Universal Filter Building Block |
| 中文描述： | QUAD SWITCHED CAPACITOR FILTER, BUTTERWORTH/CHEBYSHEV, UNIVERSAL, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOL-24 |
| 文件頁(yè)數(shù)： | 3/12頁(yè) |
| 文件大小： | 301K |
| 代理商： | LTC1264CS |
3
LTC1264-7
ELECTRICAL C
V
S
=
±
7.5V, R
L
= 10k, T
A
= 25
°
C, f
CUTOFF
= 100kHz or 50kHz, f
CLK
= 2.5MHz, TTL or CMOS level (maximum clock rise or fall
time
≤
1
μ
s) and all gain measurements are referenced to passband gain, unless otherwise specified.
HARA TERISTICS
PARAMETER
Group Delay (t
d
)
t
d
= (F/360)(1/f
C
);
(Note 2, 3)
CONDITIONS
(f
CLK
/f
C
) = 25:1, f
≤
f
CUTOFF
(f
CLK
/f
C
) = 50:1, f
≤
f
CUTOFF
(f
CLK
/f
C
) = 25:1, f
≤
f
CUTOFF
(f
CLK
/f
C
) = 50:1, f
≤
f
CUTOFF
(f
CLK
/f
C
) = 25:1, f
≤
f
CUTOFF
(f
CLK
/f
C
) = 50:1, f
≤
f
CUTOFF
(f
CLK
/f
C
) = 25:1, f
≤
f
CUTOFF
(f
CLK
/f
C
) = 50:1, f
≤
f
CUTOFF
(f
CLK
/f
C
) = 25:1
(f
CLK
/f
C
) = 50:1
V
S
= Single 5V (GND = 2V)
V
S
=
±
5V
V
S
=
±
7.5V
25:1,
±
7.5V, f = f
CLK
V
S
= Single 5V
V
S
=
±
5V
V
S
=
±
7.5V
MIN
TYP
11.3
21.6
MAX
UNITS
μ
s
μ
s
μ
s
μ
s
%
%
%
%
G
G
10.9
20.8
11.7
22.9
Group Delay Ripple
(Note 2)
±
1.0
±
1.0
G
G
±
2.0
±
2.0
Input Frequency Range
(Table 9, 10)
Maximum f
CLK
<f
CLK
<f
CLK
/2
2
3
5
120
140
±
5%
160
±
5%
175
±
5%
50
±
1.0
±
2.3
±
3.8
±
100
±
100
±
200
±
200
11
kHz
kHz
MHz
MHz
MHz
μ
V
RMS
μ
V
RMS
μ
V
RMS
μ
V
RMS
Clock Feedthrough
Wideband Noise
(1Hz
≤
f < f
CLK
)
Input Impedance
Output DC Voltage Swing
(Note 4)
30
75
k
V
S
=
±
2.375V
V
S
=
±
5V
V
S
=
±
7.5V
25:1, V
S
=
±
5V
50:1, V
S
=
±
5V
25:1, V
S
=
±
5V
50:1, V
S
=
±
5V
V
S
=
±
2.375V
V
V
V
G
G
±
2.0
±
3.0
Output DC Offset
(f
CLK
= 1MHz)
Output DC Offset TempCo
±
220
±
220
mV
mV
μ
V/
°
C
μ
V/
°
C
mA
mA
mA
mA
mA
mA
Power Supply Current
(f
CLK
= 1MHz)
22
22
23
26
28
32
±
8
G
V
S
=
±
5V
14
G
V
S
=
±
7.5V
17
G
Power Supply Range
±
2.375
V
The
G
denotes specifications which apply over the full operating temperature range.
Note 1:
Input frequencies, f, are linearly phase shifted through the filter as long as f
≤
f
C
;
f
C
= cutoff frequency.
Figure 1 curve (A) shows the typical phase response of an LTC1264-7 operating at
f
CLK
= 2.5MHz, f
C
= 100kHz. An endpoint straight line, curve (B), depicts the ideal linear
phase response of the filter. It is described by: phase shift = 180
°
– F(f/f
C
); f
≤
f
C
.
F is arbitrarily called the “phase factor” expressed in degrees. The phase factor together
with the specified deviation from the ideal straight line allows the calculation of the phase
at a given frequency. Note, the maximum phase nonlinearity, Figure 1, occurs at the vicinity
of f = 0.25 f
C
and = 0.75 f
C
. Example: The phase shift at 70kHz of the LTC1264-7 shown in
Figure 1 is: phase shift = 180
°
– 407
°
(70kHz/100kHz)
±
nonlinearity
104.9
°
±
1% or –104.9
° ±
1.05
°
.
Note 2:
Group delay and group delay deviation are calculated from the measured phase
factor and phase deviation specifications.
Note 3:
The filter cutoff frequency is abbreviated as f
CUTOFF
or f
C
.
Note 4:
The AC swing is typically 9V
P-P
, 5.6V
P-P
, 1.8V
P-P
with
±
7.5V,
±
5V,
±
2.5V supply
respectively. For more information refer to the THD + Noise vs Input graphs.
= –
Figure 1. Phase Response in the Passband (Note 1)
FREQUENCY (kHz)
0
–360
P
–270
–180
–90
0
90
180
20
40
60
80
LTC1264-7 F01
100
10
30
50
70
90
A
B
f
CLK
= 2.5MHz
(f
CLK
/f
C
) = 25:1
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