LTC1065 Linear Technology, LTC1065 Datasheet

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LTC1065

Manufacturer Part Number
LTC1065
Description
DC Accurate/ Clock-Tunable Linear Phase 5th Order Bessel Lowpass Filter
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
PPLICATI
Audio
Strain Gauge Amplifiers
Anti-Aliasing Filters
Low Level Filtering
Digital Voltmeters
Smoothing Filters
Reconstruction Filters
Clock-Tunable Cutoff Frequency
1mV DC Offset (Typical)
80dB CMR (Typical)
Internal or External Clock
50 V
100:1 Clock-to-Cutoff Frequency Ratio
80 V
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
+
1 F
TANT
3.4kHz Single 5V Supply Bessel Lowpass Filter
RMS
RMS
*
5V
SELF-CLOCKING SCHEME
Clock Feedthrough
Total Wideband Noise
4.99k
4.53k
A
S
PPLICATI
O
U
S
0.1 F
V
IN
1
2
3
4
RMS
O
LTC1065
13k*
U
Output Level
8
7
6
5
V
OUT
200pF*
1065 TA01
0.1 F
5V
Linear Phase 5th Order Bessel
D
The LTC1065 is the first monolithic filter providing both
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
50 V
lower than other existing monolithic filters.
The LTC1065 wideband noise is 80 V
process large AC input signals with low distortion. With
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 SOL.
For a Butterworth response, see LTC1063 data sheet. The
LTC1065 is pin compatible with the LTC1063.
DC Accurate, Clock-Tunable
7.5V supplies, for instance, the filter handles up to
ESCRIPTIO
RMS
RMS
(94dB S/N ratio) while the standard 1kHz THD is
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 TA02
and it can
100
RMS
1
.

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LTC1065 Summary of contents

Page 1

... S/N ratio) while the standard 1kHz THD is RMS 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 SOL. For a Butterworth response, see LTC1063 data sheet. The LTC1065 is pin compatible with the LTC1063. 8 ...

Page 2

... CLK C Maximum Clock Frequency (Note 1) Minimum Clock Frequency (Note 2) Input Frequency Range Filter Gain Operating Temperature Range LTC1065C.......................................... – LTC1065M ....................................... – 125 0.3V) IN Lead Temperature (Soldering, 10 sec)................. 300 ORDER PART NUMBER GND 3 ...

Page 3

... Min Logical “1” S Max Logical “0” = 7.5V Min Logical “1” S Max Logical “0” = 2.375V 500kHz S CLK LTC1065C LTC1065M = 5V 500kHz S CLK LTC1065C LTC1065M = 7.5V 500kHz S CLK LTC1065C LTC1065M LTC1065 MIN TYP MAX UNITS – 0.225 – 0.185 – 0.145 dB – 1.1 – 1.0 – ...

Page 4

... Note 2: At limited temperature ranges (i.e frequency can be as low as 10Hz. The typical minimum clock frequency is arbitrarily defined as: the clock frequency at which the output DC offset changes by more than 1mV TYPICAL PERFOR A Self-Clocking Frequency vs R 110 100 LTC1065 200pF 70 f 1/RC OSC ...

Page 5

... RMS 0 20kHz 2MHz CLK –40 0.4 –80 0.3 –120 0.2 –160 0.1 –200 –240 INPUT FREQUENCY (kHz) LTC1065 THD + Noise vs Input Voltage 1kHz 25° 0.1 0. 10kHz 1MHz C CLK 20kHz 2MHz C CLK 0.001 5 0 INPUT (V ...

Page 6

... LTC1065 W U TYPICAL PERFOR A Transient Response HORIZONTAL: 0.1ms/DIV, VERTICAL: 2V/DIV 10kHz 1kHz SQUARE WAVE CTIO S Power Supply Pins (Pins Package) The positive and negative supply pin should be bypassed with a high quality 0.1 F ceramic capacitor. In applications where the clock pin (5) is externally swept to provide ...

Page 7

... R IN(MAX) clock output pin with a 30% duty cycle. The clock output 2. pin can be used to drive other LTC1065s or other ICs. The – – maximum capacitance, C 2.49k – drive is illustrated in Figure 2. 3.65k 2.37k 8.25k 7 ...

Page 8

... The 200kHz clock of Example 1 will change by –1.75 For a limited temperature range, the internal oscillator of the LTC1065 can be used to generate clock frequencies above 500kHz (Figures 6 and 7). The data of Figure 6 is derived from several devices. For a given external (RC) ...

Page 9

... The 2MHz clock frequency designed above will typically drift to 1.74MHz ±7. (Figure 7 85°C A The internal clock of the LTC1065 can be overridden ±7.5V external clock provided that the external clock source can S drive the timing capacitor C, which is connected from the V = ±5V S clock input pin to ground ...

Page 10

... For a power supply V feedthrough of the LTC1065 the clock feedthrough approaches 75 V and 9 show a typical scope photo of the LTC1065 output pin when the input pin is grounded. The filter cutoff frequency was 1kHz, while scope bandwidth was chosen to be 1MHz so that switching transients above the 100kHz clock frequency would show ...

Page 11

... CLK 0.95 f 0.05 f CLK CLK 0.94 f 0.06 f CLK CLK 0.93 f 0.07 f CLK CLK 0.9 f 0.1 f CLK CLK O U TYPICAL A PPLICATI Cascading Two LTC1065s for Steeper Roll-Off LTC1065 3 6 – LTC1065 3 6 – 0 (1/RC)(1/100) C WIDEBAND NOISE = 110 V ...

Page 12

... TYP 0.014 – 0.019 (0.356 – 0.482) TYP : 499-3977 Adjusting V for OS(OUT) 7.5 Supply Operation 7.5V 10k 2.5mV OUT LTC1065 + 7. CLK 0 0 OPTIONAL, 1N4148 0.200 0.405 (5.080) (10.287) MAX 0.005 MAX (0.127) MIN ...

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