LTC1069-6
Single Supply, Very Low
Power, Elliptic Lowpass Filter
FEATURES DESCRIPTION
n
8th Order Elliptic Filter in SO-8 Package The LTC 1069-6 is a monolithic low power, 8th order lowpass
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lter optimized for single 3V or single 5V supply operation.
Single 3V Operation: Supply Current: 1mA (Typ)
The LTC1069-6 typically consumes 1mA under single 3V
f : 14kHz (Max) S/N Ratio: 72dB
CUTOFF
n supply operation and 1.2mA under 5V operation.
Single 5V Operation: Supply Current: 1.2mA (Typ)
f : 20kHz (Max) S/N Ratio: 79dB
CUTOFF
The cutoff frequency of the LTC1069-6 is clock tunable and it is
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0.1dB Passband Ripple Up to 0.9f (Typ)
CUTOFF
equal to the clock frequency divided by 50. The input signal is
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42dB Attenuation at 1.3f
CUTOFF
sampled twice per clock cycle to lower the risk of aliasing.
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66dB Attenuation at 2.0f
CUTOFF
The typical passband ripple is 0.1dB up to 0.9f .
CUTOFF
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70dB Attenuation at 2.1f
CUTOFF
The gain at f is 0.7dB. The transition band of the
CUTOFF
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Wide Dynamic Range, 75dB or More (S/N + THD),
LTC1069-6 features progressive attenuation reaching
Under Single 5V Operation
42dB at 1.3f and 70dB at 2.1f . The maximum
CUTOFF CUTOFF
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Wideband Noise: 120V
RMS
stopband attenuation is 72dB.
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Clock-to-f Ratio: 50:1
CUTOFF
n The LTC1069-6 can be clock tuned for cutoff frequencies
Internal Sample Rate: 100:1
up to 20kHz (single 5V supply) and for cutoff frequencies
up to 14kHz (single 3V supply).
APPLICATIONS
The low power feature of the LTC1069-6 does not penalize
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the devices dynamic range. With single 5V supply and
Handheld Instruments
n an input range of 0.4V to 1.4V , the Signal-to-
Telecommunication Filters
RMS RMS
n (Noise + THD) ratio is 70dB. The wideband noise of the
Antialiasing Filters
LTC1069-6 is 125V .
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Smoothing Filters RMS
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Audio
Other lter responses with higher speed can be obtained.
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Multimedia
Please contact LTC Marketing for details.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
The LTC1069-6 is available in an 8-pin SO package.
TYPICAL APPLICATION
Frequency Response
10
V = 500mV
IN RMS
0
Single 3V Supply 10kHz Elliptic Lowpass Filter
10
20
AGND V
OUT
3V 30
+
0.47F V
V
40
0.1F
LTC1069-6
50
NC NC
60
f = 500kHz
V CLK CLK
IN
70
1069-6 TA01
80
5 10 20 25
15
FREQUENCY (kHz)
1069-6 TA02
10696fa
1
GAIN (dB)LTC1069-6
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
+
Total Supply Voltage (V to V ) ................................12V
TOP VIEW
Operating Temperature Range
AGND 1 8 V
OUT
LTC1069-6C ............................................. 0C to 70C
+
V 2 7 V
LTC1069-6I ..........................................40C to 85C
NC 3 6 NC
Storage Temperature ..............................65C to 150C
V 4 5 CLK
IN
Lead Temperature (Soldering, 10 sec) .................. 300C
S8 PACKAGE
8-LEAD PLASTIC SO
T = 125C, = 130C/W
JMAX JA
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1069-6CS8#PBF LTC1069-6CS8#TRPBF 10696 8-Lead Plastic SO 0C to 70C
LTC1069-6IS8#PBF LTC1069-6IS8#TRPBF 10696I 8-Lead Plastic SO 40C to 85C
Consult LTC Marketing for parts speci ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based nish parts.
For more information on lead free part marking, go to: