LTC1264-7CS Ver la hoja de datos (PDF) - Linear Technology
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LTC1264-7CS Datasheet PDF : 12 Pages
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LTC1264-7
ELECTRICAL CHARACTERISTICS
VS = ±7.5V, RL = 10k, TA = 25°C, fCUTOFF = 100kHz or 50kHz, fCLK = 2.5MHz, TTL or CMOS level (maximum clock rise or fall
time ≤ 1µs) and all gain measurements are referenced to passband gain, unless otherwise specified.
PARAMETER
Group Delay (td)
td = (F/ 360)(1/fC);
(Note 2, 3)
Group Delay Ripple
(Note 2)
Input Frequency Range
(Table 9, 10)
Maximum fCLK
Clock Feedthrough
Wideband Noise
(1Hz ≤ f < fCLK)
Input Impedance
Output DC Voltage Swing
(Note 4)
Output DC Offset
(fCLK = 1MHz)
Output DC Offset TempCo
Power Supply Current
(fCLK = 1MHz)
Power Supply Range
CONDITIONS
(fCLK / fC) = 25:1, f ≤ fCUTOFF
(fCLK / fC) = 50:1, f ≤ fCUTOFF
(fCLK / fC) = 25:1, f ≤ fCUTOFF
(fCLK / fC) = 50:1, f ≤ fCUTOFF
(fCLK / fC) = 25:1, f ≤ fCUTOFF
(fCLK / fC) = 50:1, f ≤ fCUTOFF
(fCLK / fC) = 25:1, f ≤ fCUTOFF
(fCLK / fC) = 50:1, f ≤ fCUTOFF
(fCLK / fC) = 25:1
(fCLK / fC) = 50:1
VS = Single 5V (GND = 2V)
VS = ±5V
VS = ±7.5V
25:1, ±7.5V, f = fCLK
VS = Single 5V
VS = ±5V
VS = ±7.5V
VS = ±2.375V
VS = ±5V
VS = ±7.5V
25:1, VS = ±5V
50:1, VS = ±5V
25:1, VS = ±5V
50:1, VS = ±5V
VS = ±2.375V
VS = ±5V
VS = ±7.5V
MIN
TYP
MAX
UNITS
11.3
µs
21.6
µs
q
10.9
11.7
µs
q
20.8
22.9
µs
±1.0
%
±1.0
%
q
± 2.0
%
q
± 2.0
%
< fCLK
kHz
< fCLK / 2
kHz
2
MHz
3
MHz
5
MHz
120
140 ± 5%
160 ± 5%
175 ± 5%
30
50
75
µVRMS
µVRMS
µVRMS
µVRMS
kΩ
±1.0
V
q
±2.0
±2.3
V
q
±3.0
±3.8
V
±100
±220
mV
±100
±220
mV
±200
±200
µV/°C
µV/°C
11
22
mA
q
22
mA
14
23
mA
q
26
mA
17
28
mA
q
32
mA
± 2.375
±8
V
The q 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 ≤ fC;
fC = cutoff frequency.
Figure 1 curve (A) shows the typical phase response of an LTC1264-7 operating at
fCLK = 2.5MHz, fC = 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/fC); f ≤ fC.
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 fC and = 0.75 fC. 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 fCUTOFF or fC.
Note 4: The AC swing is typically 9VP-P, 5.6VP-P, 1.8VP-P with ± 7.5V, ±5V, ±2.5V supply
respectively. For more information refer to the THD + Noise vs Input graphs.
180
fCLK = 2.5MHz
90
(fCLK/fC) = 25:1
0
– 90
–180
B
A
–270
–360
0 10 20 30 40 50 60 70 80 90 100
FREQUENCY (kHz)
LTC1264-7 F01
Figure 1. Phase Response in the Passband (Note 1)
3
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