ltc1065csw-trpbf Linear Technology Corporation, ltc1065csw-trpbf Datasheet

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ltc1065csw-trpbf

Manufacturer Part Number
ltc1065csw-trpbf
Description
Dc Accurate, Clock-tunable Linear Phase 5th Order Bessel Lowpass Filter
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIO S
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 4857860.
TYPICAL APPLICATIO
Audio
Strain Gauge Amplifiers
Anti-Aliasing Filters
Low Level Filtering
Digital Voltmeters
Smoothing Filters
Reconstruction Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
Clock-Tunable Cutoff Frequency
1mV DC Offset (Typical)
80dB CMR (Typical)
Internal or External Clock
50µV
100:1 Clock-to-Cutoff Frequency Ratio
80µV
0.004% Noise + THD at 2V
50kHz Maximum Cutoff Frequency
Cascadable for Faster Roll-Off
Operates from ±2.375 to ±8V Power Supplies
Self-Clocking with 1 RC
Available in 8-Pin DIP and 16-Pin SW Packages
+
1µF
TANT
3.4kHz Single 5V Supply Bessel Lowpass Filter
RMS
RMS
*
5V
SELF-CLOCKING SCHEME
Clock Feedthrough
Total Wideband Noise
4.99k
4.53k
U
0.1µF
V
IN
1
2
3
4
RMS
LTC1065
13k*
U
Output Level
8
7
6
5
V
OUT
200pF*
1065 TA01
0.1µF
5V
Linear Phase 5th Order Bessel
DESCRIPTIO
The LTC
clock-tunability with low DC output offset and over 12-bit
DC accuracy. The frequency response of the LTC1065
closely approximates a 5th order Bessel polynomial. With
appropriate PCB layout techniques the output DC offset is
typically 1mV and is constant over a wide range of clock
frequencies. With ±5V supplies and ±4V input voltage
range, the CMR of the device is typically 80dB.
The filter cutoff frequency is controlled either by an inter-
nal or external clock. The clock-to-cutoff frequency ratio is
100 : 1. The on-board clock is nearly power supply inde-
pendent and it is programmed via an external RC. The
50µV
lower than other existing monolithic filters.
The LTC1065 wideband noise is 80µV
process large AC input signals with low distortion. With
±7.5V supplies, for instance, the filter handles up to
4V
below 0.005%; 87dB dynamic range (S/N + THD) is ob-
tained with input levels between 2V
The LTC1065 is available in 8-pin miniDIP and 16-pin SW
packages. For a Butterworth response, see LTC1063 data
sheet. The LTC1065 is pin compatible with the LTC1063.
DC Accurate, Clock-Tunable
RMS
RMS
(94dB S/N ratio) while the standard 1kHz THD is
®
1065 is the first monolithic filter providing both
clock feedthrough of the device is considerably
–20
–30
–40
–50
–60
–70
–80
–90
–10
10
0
1
U
Frequency Response
FREQUENCY (kHz)
Lowpass Filter
10
RMS
and 2.5V
RMS
LTC1065
1065 TA01b
and it can
100
RMS
1065fb
.
1

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ltc1065csw-trpbf Summary of contents

Page 1

... Low Level Filtering ■ Digital Voltmeters ■ Smoothing Filters ■ Reconstruction Filters , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 4857860. U TYPICAL APPLICATIO 3.4kHz Single 5V Supply Bessel Lowpass Filter 5V ...

Page 2

... 5kHz = 10kHz = 20kHz = ORDER PART NUMBER 16 V ADJ OUT LTC1065CSW 13 NC LTC1065ISW + CLK IN = 85°C 10k 25°C unless otherwise specified MIN TYP MAX 100 ±0 ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at V PARAMETER CONDITIONS Filter Gain V ±2.375V ≤ V Clock Feedthrough ±2.375V ≤ V Wideband Noise (Note 4) THD + Wideband Noise (Note Filter Output ± DC Swing V ...

Page 4

LTC1065 ELECTRICAL C HARA TERISTICS C Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The maximum clock frequency is arbitrarily defined as the frequency at which the filter ...

Page 5

W U TYPICAL PERFOR A THD + Noise vs Input Voltage Single 5V, AGND = 1kHz 25° 0 0. 5kHz 0.5MHz C ...

Page 6

LTC1065 W U TYPICAL PERFOR A Transient Response HORIZONTAL: 0.1ms/DIV, VERTICAL: 2V/DIV = ±5V 1kHz ± 10kHz SQUARE WAVE CTIO S Power Supply Pins (Pins 6, 3, ...

Page 7

CTIO S Input Pin (Pin 1, N Package) Pin 1 is the filter input and it is connected to an internal switched-capacitor resistor. If the input pin is left floating, the filter output will saturate. ...

Page 8

LTC1065 TEST CIRCUIT V IN – PPLICATI S I FOR ATIO Self-Clocking Operation The LTC1065 features an internal oscillator which can be tuned via an external RC. The LTC1065’s internal oscillator is primarily intended for ...

Page 9

PPLICATI S I FOR ATIO 200pF T = –40° ±2. –1 –2 = ±2.5V V –3 S –4 0 100 200 300 CLOCK FREQUENCY (kHz) ...

Page 10

LTC1065 PPLICATI S I FOR ATIO Table 3. CMR Data 100kHz CLK ∆V POWER SUPPLY – 40°C 25°C IN ±2.5V ±1.8V 84dB 83dB ±5V ±4V 82dB 78dB ±7.5V ±6V 80dB 77dB The above data ...

Page 11

PPLICATI S I FOR ATIO Table 4. Aliasing Data INPUT FREQUENCY OUTPUT FREQUENCY 0.9995 f 0.0005 f CLK CLK 0.995 f 0.005 f CLK CLK 0.99 f 0.01 f CLK CLK 0.9875 f 0.0125 f CLK ...

Page 12

LTC1065 U TYPICAL APPLICATIO S Cascading Two LTC1065s for Steeper Roll-Off LTC1065 3 6 – 0.1µ LTC1065 6 3 – 0.1µF ≅ (1/RC)(1/100 ...

Page 13

PACKAGE DESCRIPTIO CORNER LEADS OPTION .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .300 BSC (7.62 BSC) .008 – .018 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS U J8 Package 8-Lead CERDIP ...

Page 14

LTC1065 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( ) +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR ...

Page 15

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... V IN ≅2.5mV OUT LTC1065 + 7. CLK 0.1µF * 0.1µF * OPTIONAL, 1N4148 Offset, Cascadable DC Max = 20KHz O Max = 200KHz, Steeper Roll-Off than Bessel O LT/LT 0705 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1993 10k LT1009 1065 TA05 1065fb ...

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