LTC1164-6_15 Datasheet, PDF (1/12 Pages) Linear Technology – Low Power 8th Order Pin Selectable Elliptic or Linear Phase Lowpass Filter

LTC1164-6
Low Power 8th Order
Pin Selectable Elliptic or
Linear Phase Lowpass Filter
FEATURES
■ _{8th Order Pin Selectable Elliptic or Bessel Filter}
■ _{4mA Supply Current with ±5V Supplies}
■ _{64dB Attenuation at 1.44 fCUTOFF (Elliptic Response)}
■ _{fCUTOFF Up to 30kHz (50:1 fCLK to fCUTOFF Ratio)}
■ _{110µVRMS Wideband Noise with ±5V Supplies}
■ _{Operates at Single 5V Supply with 1VRMS}
Input Range
■ _{Operates Up to ±8V Supplies}
■ _{TTL/CMOS Compatible Clock Input}
■ _{No External Components}
■ _{Available in 14-Pin Dip and 16-Pin SO Wide Packages}
U
APPLICATIO S
■ _{Antialiasing Filters}
■ _{Battery-Operated Instruments}
■ _{Telecommunication Filters}
DESCRIPTIO
The LTC^®1164-6 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 ±5V supplies the LTC1164-6 uses only 4mA supply
current while keeping wideband noise below 110µV_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 ^–). 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 _–3dB and f_CLK / f _–3dB
ratio of 160:1. The LTC1164-6 is pin compatible with the
LTC1064-1.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
10kHz Anti-Aliasing Elliptic Filter
NC ¹
14
V_IN ²
13
3
12
8V
4 _LTC1164-6 11
5
10
6
9
7
8
NC
–8V
CLK = 1MHz
–8V
V_OUT
1164-6 TA01
WIDEBAND NOISE = 115µV_RMS
NOTE: THE CONNECTION FROM PIN 7 TO PIN 14 SHOULD BE MADE
UNDER THE PACKAGE. THE POWER SUPPLIES SHOULD BE BYPASSED
BY A 0.1µF CAPACITOR AS CLOSE TO THE PACKAGE AS POSSIBLE.
Frequency Response
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
1
10
FREQUENCY (kHz)
100
1164-6 TA02
11646fa
1