參數(shù)資料
型號(hào): LTC1264-7CN
廠商: Linear Technology
文件頁(yè)數(shù): 3/16頁(yè)
文件大?。?/td> 0K
描述: IC FILTER 8TH ORDR LOWPASS 14DIP
標(biāo)準(zhǔn)包裝: 25
濾波器類型: 線性相位,低通開關(guān)電容器
頻率 - 截止或中心: 200kHz
濾波器數(shù): 1
濾波器階數(shù): 8th
電源電壓: ±2.37 V ~ 8 V
安裝類型: 通孔
封裝/外殼: 14-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 14-PDIP
包裝: 管件
LTC1264-7
12647fa
11
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.
Ratio Input Pin (10)
The DC level at this pin determines the ratio of the clock
frequency to the cutoff frequency of the filter. Pin 10 at V
+
gives a 25:1 ratio and pin 10 at V
gives a 50:1 ratio. For
single supply operation the ratio is 25:1 when pin 10 is at
V
+ and 50:1 when pin 10 is at ground. When pin 10 is not
tied to ground, it should be bypassed to analog ground
with a 0.1
F capacitor. If the DC level at pin 10 is switched
mechanically or electrically at slew rates greater than
1V/
s while the device is operating, a 10k resistor should
be connected between pin 10 and the DC source.
UU
U
PI FU CTIO S
Clock Input Pin (11)
Any TTL or CMOS clock source with a square-wave output
and 50% duty cycle (
±10%) is an adequate clock source
for the device. The power supply for the clock source
should not be the filter’s power supply. The analog ground
for the filter should be connected to clock’s ground at a
single point only. Table 7 shows the clock’s low and high
level threshold values for a dual or single supply operation.
A pulse generator can be used as a clock source provided
the high level ON time is greater than 0.1
s. Sine waves are
not recommended for clock input frequencies less than
100kHz, since excessively slow clock rise or fall times
generate internal clock jitter (maximum clock rise or fall
time
≤1s). The clock signal should be routed from the
right side of the IC package and perpendicular to it to avoid
coupling to any input or output analog signal path. A 200
resistor between clock source and pin 11 will slow down
the rise and fall times of the clock to further reduce charge
coupling (Figures 2 and 3).
Table 7. Clock Source High and Low Threshold Levels
POWER SUPPLY
HIGH LEVEL
LOW LEVEL
Dual Supply =
±7.5V
≥ 2.18V
≤ 0.5V
Dual Supply =
±5V
≥ 1.45V
≤ 0.5V
Dual Supply =
±2.5V
≥ 0.73V
≤ – 2.0V
Single Supply = 12V
≥ 7.80V
≤ 6.5V
Single Supply = 5V
≥ 1.45V
≤ 0.5V
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