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LTC1164-6 Datasheet

  • LTC1164-6

  • Low Power 8th Order Pin Selectable Elliptic or Linear Phase ...

  • 12頁

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LTC1164-6
Low Power 8th Order
Pin Selectable Elliptic or
Linear Phase Lowpass Filter
FEATURES
s
s
s
s
s
s
DESCRIPTIO
s
s
s
8th Order Pin Selectable Elliptic or Bessel Filter in a
14-Pin Package
4mA Supply Current with
鹵5V
Supplies
64dB Attenuation at 1.44 f
CUTOFF
(Elliptic Response)
f
CUTOFF
up to 30kHz (50:1 f
CLK
to f
CUTOFF
Ratio)
110碌V
RMS
Wideband Noise with
鹵5V
Supplies
Operates at Single 5V Supply with 1V
RMS
Input Range
Operates up to
鹵8V
Supplies
TTL/CMOS Compatible Clock Input
No External Components
The LTC1164-6 is a monolithic 8th order elliptic lowpass
filter featuring clock-tunable cutoff frequency and low
power supply current. Low power operation is achieved
without compromising noise or distortion performance.
At
鹵5V
supplies the LTC1164-6 uses only 4mA supply
current while keeping wideband noise below 110碌V
RMS
.
With a single 5V supply, the LTC1164-6 can provide up to
10kHz cutoff frequency and 80dB signal-to-noise ratio
while consuming only 2.5mA.
The LTC1164-6 provides an elliptic lowpass rolloff with
stopband attenuation of 64dB at 1.44 f
CUTOFF
and an f
CLK
-
to-f
CUTOFF
ratio of 100:1 (pin 10 to V
鈥?/div>
). For a ratio of 100:1,
f
CUTOFF
can be clock-tuned up to 10kHz. For a f
CLK
-to-
f
CUTOFF
ratio of 50:1 (pin 10 to V
+
), the LTC1164-6
provides an elliptic lowpass filter with f
CUTOFF
frequencies
up to 20kHz. When pin 10 is connected to ground, the
LTC1164-6 approximates an 8th order linear phase re-
sponse with 65dB attenuation at 4.5 f
鈥?3dB
and f
CLK
/ f
鈥?3dB
ratio of 160:1. The LTC1164-6 is pin compatible with the
LTC1064-1.
APPLICATI
s
s
s
S
Anti-Aliasing Filters
Battery-Operated Instruments
Telecommunication Filters
TYPICAL APPLICATI
10kHz Anti-Aliasing Elliptic Filter
NC
V
IN
1
2
3
8V
4
5
6
7
LTC1164-6
14
13
12
11
10
9
8
1164-6 TA01
0
NC
鈥?V
CLK = 1MHz
鈥?V
V
OUT
GAIN (dB)
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
WIDEBAND NOISE = 115碌V
RMS
NOTE: THE CONNECTION FROM PIN 7 TO PIN 14 SHOULD BE MADE
UNDER THE PACKAGE. THE POWER SUPPLIES SHOULD BE BYPASSED
BY A 0.1碌F CAPACITOR AS CLOSE TO THE PACKAGE AS POSSIBLE.
鈥?0
1
10
FREQUENCY (kHz)
100
1164-6 TA02
U
Frequency Response
UO
UO
1

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