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LTC1066-1CS Datasheet

  • LTC1066-1CS

  • 14-Bit DC Accurate Clock-Tunable, 8th Order Elliptic or Line...

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LTC1066-1
14-Bit DC Accurate
Clock-Tunable, 8th Order Elliptic
or Linear Phase Lowpass Filter
FEATURES
s
s
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s
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s
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s
DESCRIPTIO
DC Gain Linearity: 14 Bits
Maximum DC Offset:
鹵1.5mV
DC Offset TempCo: 7碌V/擄C
Device Fully Tested at f
CUTOFF
= 80kHz
Maximum Cutoff Frequency: 120kHz (V
S
=
鹵8V)
Drives 1k鈩?Load with 0.02% THD or Better
Signal-to-Noise Ratio: 90dB
Input Impedance: 500M鈩?/div>
Selectable Elliptic or Linear Phase Response
Operates from Single 5V up to
鹵8V
Power Supplies
The LTC1066-1 is an 8th order elliptic lowpass filter which
simultaneously provides clock-tunability and DC accu-
racy. The unique and proprietary architecture of the filter
allows 14 bits of DC gain linearity and a maximum of
1.5mV DC offset. An external RC is required for DC
accurate operation. With
鹵7.5V
supplies, a 20k resistor
and a 1碌F capacitor, the cutoff frequency can be tuned
from 800Hz to 100kHz. A clock-tunable 10Hz to 100kHz
operation can also be achieved (see Typical Application
section).
The filter does not require any external active components
such as input/output buffers. The input/output impedance
is 500M鈩?0.1鈩?and the output of the filter can source or
sink 40mA. When pin 8 is connected to V
+
, the clock-to-
cutoff frequency ratio is 50:1 and the input signal is
sampled twice per clock cycle to lower the risk of aliasing.
For frequencies up to 0.75f
CUTOFF
, the passband ripple is
鹵0.15dB.
The gain at f
CUTOFF
is 鈥?dB and the filter鈥檚
stopband attenuation is 80dB at 2.3f
CUTOFF
. Linear phase
operation is also available with a clock-to-cutoff frequency
ratio of 100:1 when pin 8 is connected to ground.
The LTC1066-1 is available in an 18-pin SOL package.
APPLICATI
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Instrumentation
Data Acquisition Systems
Anti-Aliasing Filters
Smoothing Filters
Audio Signal Processing
TYPICAL APPLICATI
Clock-Tunable, DC Accurate, 800Hz to 80kHz Elliptic Lowpass Filter
20k
10
1碌F
1
2
V
IN
鈥?.5V
SHORT CONNECTION UNDER
IC AND SHIELDED BY A
GROUND PLANE
BYPASS THE POWER SUPPLIES
WITH 0.1碌F DISC CERAMIC
40kHz
鈮?/div>
f
CLK
鈮?/div>
4MHz
7.5V
3
4
5
6
7
8
9
OUT A
鈥揑N A
+IN A
V
鈥?/div>
V
+
CONNECT 1
FILTER
OUT
50/100
CLK
LTC1066-1
V
+
OUT B
+IN B
GND
18
17
16
15
14
13
12
11
10
鈥?.5V
1066-1 TA01
7.5V
V
OUT
;
V
OS(OUT)
=
2.5mV
MAX
GAIN (dB)
FILTER
IN
COMP 2
CONNECT 2
COMP 1
V
鈥?/div>
30k
15pF
U
Amplitude Response
0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?0
100
1k
10k
100k
FREQUENCY (Hz)
1M
1066-1 TA02
UO
UO
f
C
= 80kHz
f
C
= 800Hz
1

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