LTC1164-6CS Linear Technology, LTC1164-6CS Datasheet - Page 6

• Manufacturer Part Number: LTC1164-6CS
• Description: Low Power 8th Order Pin Selectable Elliptic or Linear Phase Lowpass Filter
• Manufacturer: Linear Technology

PI FU CTIO S
filter’s power supplies should be isolated from other
digital or high voltage analog supplies. A low noise linear
supply is recommended. Using a switching power supply
will lower the signal-to-noise ratio of the filter. The supply
during power-up should have a slew rate less than 1V/ s.
When V
TYPICAL PERFOR
Power Supply Pins (4, 12)
The V
a 0.1 F capacitor to an adequate analog ground. The
ground, a signal diode must be used to clamp V
LTC1164-6
6
– 40
–45
– 50
–55
–60
–65
–70
–75
–80
–85
–90
U
0.1
THD + Noise vs RMS Input
(Elliptic Response)
+
(f
f
IN
(pin 4) and the V
CLK
= 1kHz, T
+
/f
is applied before V
C
U
) = 100:1 OR 50:1
A
= 25°C
INPUT (V
Transient Response
V
f
ELLIPTIC RESPONSE
U
CLK
S
RMS
1
= 7.5V, V
–
= 500kHz, (f
V
V
)
(pin 12) should be bypassed with
S
S
= ±5V
= ±7.5V
(14-Lead Dual-In-Line Package)
W
IN
= 3V 100Hz SQUARE WAVE
–
CLK
1164-6 G17
A
and V
/f
1ms/DIV
C
U
) = 100:1, f
5
CE
–
could go above
CUTOFF
C
HARA TERISTICS
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
= 5kHz
0.1
THD + Noise vs RMS Input for
Single 5V (Elliptic Response)
–
(f
f
1164-6 G20
A. GND = 2.5V
B. GND = 2V
IN
. Figures
CLK
= 1kHz, T
/f
C
C
) = 100:1 OR 50:1
A
= 25°C
INPUT (V
1 and 2 show typical connections for dual and single
supply operation.
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 1 shows the clock’s low and high
RMS
)
1
A
Transient Response
V
f
LINEAR PHASE RESPONSE
CLK
S
1164-6 G18
= 7.5V, V
B
= 800kHz, (f
2
IN
= 3V 100Hz SQUARE WAVE
CLK
/f
1ms/DIV
C
) = 160:1, f
12
11
10
9
8
7
6
5
4
3
2
1
0
0
Power Supply Current vs Power
Supply Voltage
1
CUTOFF
2
POWER SUPPLY (V
= 5kHz
3
1164-6 G21
4
5
6
+
OR V
7
–
8
)
125°C
–55°C
25°C
1164-6 G19
9
10