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參數(shù)資料
| 型號： | LTC1264-7 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Linear Phase, Group Delay Equalized, 8th Order Lowpass Filter |
| 中文描述： | 線性相位，群時(shí)延均衡，8階低通濾波器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 301K |
| 代理商： | LTC1264-7 |
10
LTC1264-7
Filter Input Pin (2)
The input pin is connected internally through a 50k resistor
tied to the inverting input of an op amp.
Filter Output Pins (9, 6)
Pin 9 is the specified output of the filter; it can typically
source 3mA and sink 1mA. Driving coaxial cables or
resistive loads less than 20k will degrade the total har-
monic distortion of the filter. When evaluating the device’s
PI FU
U
distortion an output buffer is required. A noninverting
buffer, Figure 4, can be used provided that its input
common-mode range is well within the filter’s output
swing. Pin 6 is an intermediate filter output providing an
unspecified 6th order lowpass filter. Pin 6 should not be
loaded.
External Connection Pins (7, 14)
Pins 7 and 14 should be connected together. In a printed
circuit board the connection should be done under the IC
package through a short trace surrounded by the analog
ground plane.
NC Pin (1, 5, 8, 13)
Pins 1, 5, 8 and 13 are not connected to any internal circuit
point on the device and should be preferably tied to analog
ground.
Figure 4. Buffer for Filter Output
1k
1264-7 F04
–
+
LT1220
U
S
A
Clock Feedthrough
Clock feedthrough is defined as the RMS value of the clock
frequency and its harmonics that are present at the filter’s
output pin (9). The clock feedthrough is tested with the
input pin (2) grounded and it depends on PC board layout
and on the value of the power supplies. With proper layout
techniques the values of the clock feedthrough are shown
in Table 8.
O
PPLICATI
U
U
clock feedthrough, if bothersome, can be greatly reduced
by adding a simple R/C lowpass network at the output of
the filter pin (9). This R/C will completely eliminate any
switching transients.
Wideband Noise
The wideband noise of the filter is the total RMS value of
the device’s noise spectral density and it is used to
determine the operating signal-to-noise ratio. Most of its
frequency contents lie within the filter passband and it
cannot be reduced with post filtering. For instance, the
LTC1264-7 wideband noise at
±
5V supply is 160
μ
V
RMS
,
145
μ
V
RMS
of which have frequency contents from DC up
to the filter’s cutoff frequency. The total wideband noise
(
μ
V
RMS
) is nearly independent of the value of the clock.
The clock feedthrough specifications are not part of the
wideband noise.
Speed Limitations
To avoid op amp slew rate limiting at maximum clock
frequencies, the signal amplitude should be kept below a
specified level as shown in Table 9.
Any parasitic switching transients during the rise and fall
edges of the incoming clock are not part of the clock
feedthrough specifications. Switching transients have fre-
quency contents much higher than the applied clock; their
amplitude strongly depends on scope probing techniques
as well as grounding and power supply bypassing. The
Note: The clock feedthrough at 25:1 is imbedded in the wideband
noise of the filter. Clock waveform is a square wave.
Table 8. Clock Feedthrough
V
S
Single 5V
±
5V
±
7.5V
25:1
50:1
100
μ
V
RMS
100
μ
V
RMS
120
μ
V
RMS
100
μ
V
RMS
400
μ
V
RMS
1000
μ
V
RMS
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