LTC1069-1_15 Datasheet, PDF (1/10 Pages) Linear Technology – Low Power, 8th Order Progressive Elliptic, Lowpass Filter

FEATURES
n _{8th Order Elliptic Filter in SO-8 Package}
n _{Operates from Single 3.3V to ±5V Power Supplies}
n _{–20dB at 1.2fCUTOFF}
n _{–52dB at 1.4fCUTOFF}
n _{–70dB at 2fCUTOFF}
n _{Wide Dynamic Range}
n _{110μVRMS Wideband Noise}
n _{3.8mA Supply Current with ±5V Supplies}
n _{2.5mA Supply Current with Single 5V Supply}
n _{2mA Supply Current with Single 3.3V Supply}
APPLICATIONS
n _{Telecommunication Filters}
n _{Antialiasing Filters}
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Single 3.3V Supply 3kHz Elliptic Lowpass Filter
+
0.47μF
3.3V
0.1μF
V_IN
AGND V_OUT
V⁺
V^–
LTC1069-1
NC
NC
V_IN
CLK
V_OUT
f_CLK
300kHz
1069-1 TA01
LTC1069-1
Low Power, 8th Order
Progressive Elliptic,
Lowpass Filter
DESCRIPTION
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 0.9f_CUTOFF. The stopband attenuation of the LTC1069-1
features a progressive elliptic response reaching 20dB
attenuation at 1.2f_CUTOFF, 52dB attenuation 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 market-
ing for details.
The LTC1069-1 is available in 8-pin PDIP and 8-pin SO
packages.
10
0
–10
–20
–30
–40
–50
–60
–70
–80
1.5
Frequency Response
3
4.5
6
FREQUENCY (kHz)
7.5
10691 TA02
10691fa
1