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LTC1164-5M Datasheet

  • LTC1164-5M

  • Linear Technology [Low Power 8th Order Pin Selectable Butte...

  • LINER

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LTC1164-5
Low Power 8th Order
Pin Selectable Butterworth
or Bessel Lowpass Filter
DESCRIPTIO
The LTC
廬
1164-5 is a monolithic 8th order filter; it approxi-
mates either a Butterworth or a Bessel lowpass response.
The LTC1164-5 features clock-tunable cutoff frequency
and low power consumption (4.5mA with
鹵5V
supplies
and 2.5mA with single 5V supply).
Low power operation is achieved without compromising
noise or distortion performance. With
鹵5V
supplies and
10kHz cutoff frequency, the operating signal-to-noise
ratio is 86dB and the THD throughout the passband is
0.015%. Under the same conditions, a 77dB signal-to-
noise ratio and distortion is obtained with a single 5V
supply while the clock feedthrough is kept below the noise
level. The maximum signal-to-noise ratio is 92dB.
The LTC1164-5 approximates an 8th order Butterworth
response with a clock-to-cutoff frequency ratio of 100:1
(Pin 10 to V
鈥?/div>
) or 50:1 double-sampled (Pin 10 to V
+
and
Pin 1 shorted to Pin 13). Double-sampling allows the input
signal frequency to reach the clock frequency before any
aliasing occurrence. An 8th order Bessel response can
also be approximated with a clock-to-cutoff frequency
ratio of 140:1 (Pin 10 to ground). With
鹵7.5V
supply,
鹵5V
supply and single 5V supply, the maximum clock fre-
quency of the LTC1164-5 is 1.5MHz, 1MHz, and 1MHz
respectively. The LTC1164-5 is pin-compatible with the
LTC1064-2 and LTC-1064-3.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
s
s
s
s
s
s
s
s
s
s
Pin Selectable Butterworth or Bessel Response
4mA Supply Current with
鹵5V
Supplies
f
CUTOFF
up to 20kHz
100碌V
RMS
Wideband Noise
THD < 0.02% (50:1, V
S
=
鹵7.5V,
V
IN
= 2V
RMS
)
Operates with a Single 5V Supply (1V
RMS
Input
Range)
60碌V
RMS
Clock Feedthrough (Single 5V Supply)
Operates up to
鹵8V
Supplies
TTL/CMOS-Compatible Clock Input
No External Components
APPLICATIO S
s
s
s
s
Anti-Aliasing Filters
Battery-Operated Instruments
Telecommunications Filters
Smoothing Filters
TYPICAL APPLICATIO
1
V
IN
2
3
8V
4
5
NC
6
7
LTC1164-5
14
Butterworth 20kHz Anti-Aliasing Filter
12
11
10
9
8
GAIN (dB)
13
鈥?V
CLK = 1MHz
TO V
+
V
OUT
WIDEBAND NOISE = 110碌V
RMS
THD IN PASSBAND < 0.02% AT V
IN
= 2V
RMS
NOTE: THE CONNECTION FROM PIN 7 TO PIN 14
SHOULD BE MADE UNDER THE PACKAGE.
FOR 50:1 OPERATION CONNECT PIN 1 TO PIN 13
AS SHOWN. FOR 100:1 OR 150:1 OPERATION PINS 1
AND 13 SHOULD FLOAT. THE POWER SUPPLIES
SHOULD BE BYPASSED BY A 0.1碌F CAPACITOR AS
CLOSE TO THE PACKAGE AS POSSIBLE.
1164-5 TA01
U
U
U
Frequency Response
0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
1
10
FREQUENCY (kHz)
100
LTC1164-5 TA02
1

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