LTC1063
DC Accurate, Clock-Tunable
5th Order Butterworth
Lowpass Filter
DESCRIPTIO
FEATURES
The LTC 1063 is the first monolithic filter providing both
Clock-Tunable Cutoff Frequency
clock-tunability, low DC output offset and over 12-bit DC
1mV DC Offset (Typical)
80dB CMRR (Typical) accuracy. The frequency response of the LTC1063 closely
approximates a 5th order Butterworth polynomial. With
Internal or External Clock
appropriate PCB layout techniques the output DC offset is
50V Clock Feedthrough
RMS
100:1 Clock-to-Cutoff Frequency Ratio typically 1mV and is constant over a wide range of clock
frequencies. With 5V supplies and 4V input voltage
95V Total Wideband Noise
RMS
range, the CMR of the device is 80dB.
0.01% THD at 2V Output Level
RMS
50kHz Maximum Cutoff Frequency
The filter cutoff frequency is controlled either by an inter-
Cascadable for Faster Roll-Off
nal or external clock. The clock-to-cutoff frequency ratio is
Operates from 2.375 to 8V Power Supplies
100:1. The on-board clock is power supply independent,
Self-Clocking with 1 RC
and it is programmed via an external RC. The 50V
RMS
Available in 8-Pin DIP and 16-Pin SO Wide Packages
clock feedthrough is considerably reduced over existing
U monolithic filters.
APPLICATIO S
The LTC1063 wideband noise is 95V , and it can
RMS
Audio
process large AC input signals with low distortion. With
Strain Gauge Amplifiers
7.5V supplies, for instance, the filter handles up to
Anti-Aliasing Filters
4V (92dB S/N ratio) while the standard 1kHz THD is
RMS
Low Level Filtering
below 0.02%; 80dB dynamic ranges (S/N +THD) is ob-
Digital Voltmeters
tained with input levels between 1V and 2.3V .
RMS RMS
60Hz Lowpass Filters
The LTC1063 is available in 8-pin miniDIP and 16-pin SO
Smoothing Filters
wide packages. For a linear phase response, see LTC1065
Reconstruction Filters
data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
Frequency Response
10
2.5kHz 5th Order Lowpass Filter
0
1 8
V **
IN
10
2 7
20
V
OUT
LTC1063
30
3 6
5V
40
0.1F
4 5
5V
50
60
*19.1k
0.1F 200pF*
70
80
* SELF-CLOCKING SCHEME
+
90
** IF THE INPUT VOLTAGE CAN EXCEED V ,
1 10 100
+
CONNECT A SIGNAL DIODE BETWEEN PIN 1 AND V .
FREQUENCY (kHz)
1063 TA01
1063 TA02
1063fa
1
GAIN (dB)
U
ULTC1063
ABSOLUTE MAXIMUM RATINGS (Note 1)
+
Total Supply Voltage (V to V ) .......................... 16.5V Operating Temperature Range ............... 40C to 85C
Power Dissipation............................................. 400mW Storage Temperature Range ................ 65C to 150C
+
Voltage at Any Input .... (V 0.3V) V (V + 0.3V) Lead Temperature (Soldering, 10 sec)................. 300C
IN
Burn-In Voltage ...................................................... 16V
PACKAGE/ORDER I FOR ATIO
ORDER PART ORDER PART
TOP VIEW
TOP VIEW
NUMBER NUMBER
16
NC 1 V ADJ
OS
V 1 8 V ADJ
IN OS
15
V 2 NC
IN
LTC1063CN8 LTC1063CSW
GND 2 7 V
OUT
14
GND 3 V
OUT
+
V 3 6 V
13
NC 4 NC
CLK OUT 4 5 CLK IN
+
12
V 5 V
11
NC 6 NC
N8 PACKAGE
8-LEAD PLASTIC DIP
10
NC 7 NC
T = 100C, = 110C/W (N)
JMAX JA
9
CLK OUT 8 CLK IN
J8 PACKAGE
LTC1063CJ8
SW PACKAGE
8-LEAD CERAMIC DIP
16-LEAD PLASTIC SO WIDE
LTC1063MJ8
T = 150C, = 100C/W (J)
JMAX JA
T = 100C, = 85C/W
JMAX JA
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: