LTC1069-1 Datasheet, PDF (1/8 Pages) Linear Technology – Low Power, 8th Order Progressive Elliptic, Lowpass Filter

LTC1069-1
Low Power, 8th Order
Progressive Elliptic,
Lowpass Filter
FEATURES
s _{8th Order Elliptic Filter in SO-8 Package}
s _{Operates from Single 3.3V to ±5V Power Supplies}
s _{– 20dB at 1.2 fCUTOFF}
s _{– 52dB at 1.4 fCUTOFF}
s _{– 70dB at 2 fCUTOFF}
s _{Wide Dynamic Range}
s _{110µVRMS Wideband Noise}
s _{3.8mA Supply Current with ±5V Supplies}
s _{2.5mA Supply Current with Single 5V Supply}
s _{2mA Supply Current with Single 3.3V Supply}
APPLICATI S
s _{Telecommunication Filters}
s _{Antialiasing Filters}
DESCRIPTIO
The LTC^®1069-1 is a monolithic 8th order lowpass filter
featuring clock-tunable cutoff frequency and 2.5mA power
supply current with a single 5V supply. An additional
feature of the LTC1069-1 is operation with a single 3.3V
supply.
The cutoff frequency (f_CUTOFF) of the LTC1069-1 is equal
to the clock frequency divided by 100. The gain at f_CUTOFF
is – 0.7dB and the typical passband ripple is ±0.15dB
up to 0.9 f_CUTOFF. The stopband attenuation of the
LTC1069-1 features a progressive elliptic response
reaching 20dB attenuation at 1.2 f_CUTOFF, 52dB attenua-
tion at 1.4f_CUTOFF and 70dB attenuation at 2f_CUTOFF.
With ±5V supplies, the LTC1069-1 cutoff frequency can
be clock-tuned up to 12kHz; with a single 5V supply, the
maximum cutoff frequency is 8kHz.
The low power feature of the LTC1069-1 does not penal-
ize the device’s dynamic range. With ±5V supplies and an
input range of 0.3V_RMS to 2.5V_RMS, the signal-to-(noise
+ THD) ratio is ≥ 70dB. The wideband noise of the
LTC1069-1 is 110µV_RMS. Other filter responses with
lower power or higher speed can be obtained. Please
contact LTC marketing for details.
The LTC1069-1 is available in 8-pin PDIP and 8-pin SO
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
Single 3.3V Supply 3kHz Elliptic Lowpass Filter
+
0.47µF
3.3V
0.1µF
1 _{AGND VOUT} 8
2 _V+
V^{– 7}
LTC1069-1
3 _NC
NC ⁶
V_OUT
V_IN ⁴ V_IN
CLK ⁵
f_CLK
300kHz
1069-1 TA01
10
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
1.5
Frequency Response
3
4.5
6
FREQUENCY (kHz)
7.5
1069-1 TA02
1