ltc1164-6 Linear Technology Corporation, ltc1164-6 Datasheet - Page 6

• Manufacturer Part Number: ltc1164-6
• Description: Low Power 8th Order Pin Selectable Elliptic Or Linear Phase Lowpass Filter
• Manufacturer: Linear Technology Corporation

TYPICAL PERFOR
PI FU CTIO S
LTC1164-6
NC (Pins 1, 8, 13): Pins 1, 8, and 13 are not connected to
any internal circuit point on the device and should prefer-
ably be tied to analog ground.
V
a 50k resistor tied to the inverting input of an op amp.
GND (Pins 3, 5): The filter performance depends on the
quality of the analog signal ground. For either dual or
single supply operation, an analog ground plane sur-
rounding the package is recommended. The analog ground
plane should be connected to any digital ground at a single
point. For dual supply operation, Pins 3 and 5 should be
connected to the analog ground plane. For single supply
operation Pins 3 and 5 should be biased at 1/2 supply and
they should be bypassed to the analog ground plane with
6
IN
– 40
– 50
–45
–55
–60
–65
–70
–75
–80
–85
–90
U
(Pin 2): The input pin is connected internally through
0.1
THD + Noise vs RMS Input
(Elliptic Response)
(f
f
IN
CLK
= 1kHz, T
/f
C
U
) = 100:1 OR 50:1
A
= 25°C
INPUT (V
Transient Response
V
f
ELLIPTIC RESPONSE
CLK
U
RMS
S
1
= ±7.5V, V
= 500kHz, (f
V
V
)
S
S
= ±5V
= ±7.5V
(14-Lead Dual-In-Line Package)
W
IN
= ±3V 100Hz SQUARE WAVE
1164-6 G17
CLK
A
/f
1ms/DIV
C
U
) = 100:1, f
5
CE
CUTOFF
C
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
HARA TERISTICS
0.1
= 5kHz
THD + Noise vs RMS Input for
Single 5V (Elliptic Response)
(f
f
A. GND = 2.5V
B. GND = 2V
IN
1164-6 G20
CLK
= 1kHz, T
/f
C
C
) = 100:1 OR 50:1
A
= 25°C
INPUT (V
at least a 1µF capacitor (Figure 2). For single 5V operation
at the highest f
at 2V. This minimizes passband gain and phase variations
(see Typical Performance Characteristics curves: Maxi-
mum Passband for Single 5V, 50:1; and THD + Noise vs
RMS Input for Single 5V, 50:1).
V
be bypassed with a 0.1µF capacitor to an adequate analog
ground. The 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/µs. When V
RMS
+
(Pins 4, 12):The V
)
1
A
Transient Response
V
f
LINEAR PHASE RESPONSE
CLK
1164-6 G18
S
= ±7.5V, V
B
= 800kHz, (f
2
CLK
IN
of 1MHz, Pins 3 and 5 should be biased
= ±3V 100Hz SQUARE WAVE
CLK
+
/f
1ms/DIV
C
(Pin 4) and the V
) = 160:1, f
12
11
10
9
8
7
6
5
4
3
2
1
0
0
+
Power Supply Current vs Power
Supply Voltage
is applied before V
1
CUTOFF
2
POWER SUPPLY (V
= 5kHz
3
1164-6 G21
4
–
5
(Pin 12) should
6
+
OR V
7
–
–
8
)
and V
125°C
–55°C
25°C
1164-6 G19
11646fa
9
10
–