LTC1164-5C Linear Technology, LTC1164-5C Datasheet

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LTC1164-5C

Manufacturer Part Number
LTC1164-5C
Description
Low Power 8th Order Pin Selectable Butterworth or Bessel Lowpass Filter
Manufacturer
Linear Technology
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1164-5CSW
Manufacturer:
LTNEAR
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
V
NC
8V
IN
Pin Selectable Butterworth or Bessel Response
4mA Supply Current with 5V Supplies
f
100 V
THD < 0.02% (50:1, V
Operates with a Single 5V Supply (1V
Range)
60 V
Operates up to 8V Supplies
TTL/CMOS-Compatible Clock Input
No External Components
Anti-Aliasing Filters
Battery-Operated Instruments
Telecommunications Filters
Smoothing Filters
CUTOFF
RMS
RMS
up to 20kHz
1
2
3
4
5
6
7
Butterworth 20kHz Anti-Aliasing Filter
Clock Feedthrough (Single 5V Supply)
Wideband Noise
LTC1164-5
U
14
13
12
11
10
9
8
S
= 7.5V, V
1164-5 TA01
–8V
CLK = 1MHz
TO V
V
U
OUT
+
IN
= 2V
RMS
WIDEBAND NOISE = 110 V
THD IN PASSBAND < 0.02% AT V
NOTE: THE CONNECTION FROM PIN 7 TO PIN 14
SHOULD BE MADE UNDER THE PACKAGE.
FOR 50:1 OPERATION CONNECT PIN 1 TO PIN 13
AS SHOWN. FOR 100:1 OR 150:1 OPERATION PINS 1
AND 13 SHOULD FLOAT. THE POWER SUPPLIES
SHOULD BE BYPASSED BY A 0.1 F CAPACITOR AS
CLOSE TO THE PACKAGE AS POSSIBLE.
RMS
Input
)
RMS
DESCRIPTIO
The LTC
mates either a Butterworth or a Bessel lowpass response.
The LTC1164-5 features clock-tunable cutoff frequency
and low power consumption (4.5mA with 5V supplies
and 2.5mA with single 5V supply).
Low power operation is achieved without compromising
noise or distortion performance. With 5V supplies and
10kHz cutoff frequency, the operating signal-to-noise
ratio is 86dB and the THD throughout the passband is
0.015%. Under the same conditions, a 77dB signal-to-
noise ratio and distortion is obtained with a single 5V
supply while the clock feedthrough is kept below the noise
level. The maximum signal-to-noise ratio is 92dB.
The LTC1164-5 approximates an 8th order Butterworth
response with a clock-to-cutoff frequency ratio of 100:1
(Pin 10 to V
Pin 1 shorted to Pin 13). Double-sampling allows the input
signal frequency to reach the clock frequency before any
aliasing occurrence. An 8th order Bessel response can
also be approximated with a clock-to-cutoff frequency
ratio of 140:1 (Pin 10 to ground). With 7.5V supply, 5V
supply and single 5V supply, the maximum clock fre-
quency of the LTC1164-5 is 1.5MHz, 1MHz, and 1MHz
respectively. The LTC1164-5 is pin-compatible with the
LTC1064-2 and LTC-1064-3.
Pin Selectable Butterworth
, LTC and LT are registered trademarks of Linear Technology Corporation.
IN
= 2V
RMS
or Bessel Lowpass Filter
®
1164-5 is a monolithic 8th order filter; it approxi-
Low Power 8th Order
) or 50:1 double-sampled (Pin 10 to V
U
–20
–30
–40
–50
–60
–70
–80
–10
0
1
Frequency Response
FREQUENCY (kHz)
LTC1164-5
10
LTC1164-5 TA02
+
1
and
100

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LTC1164-5C Summary of contents

Page 1

... With 7.5V supply, 5V supply and single 5V supply, the maximum clock fre- quency of the LTC1164-5 is 1.5MHz, 1MHz, and 1MHz respectively. The LTC1164-5 is pin-compatible with the LTC1064-2 and LTC-1064-3. , LTC and LT are registered trademarks of Linear Technology Corporation. ...

Page 2

... CLK Gain with V = 2.375V (Note 3) S Input Frequency Range 2 U (Note 1) Operating Temperature Range – – 0.3V) LTC1164-5C ...................................... – LTC1164-5M .................................... – 125 C Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 ORDER PART NUMBER 50:1 MODE ...

Page 3

... 100kHz CLK f = 1kHz CUTOFF (100:1, PIN – 375kHz CLK f = 2.68kHz CUTOFF (140:1, PIN 10 GND 500kHz CLK f = 10kHz CUTOFF (50:1, PIN PINS 1-13 SHORTED) 50 LTC1164-5 LTC1164-5C MIN TYP MAX 1.5 1.0 1.0 200 100 100 5% 115 5% 70 100 160 1.25 1.50 3.70 4.10 5.40 5.90 50 160 100 2.5 4.0 4.5 4 ...

Page 4

... CLK f CUTOFF 750kHz CLK f CUTOFF 1MHz CLK f CUTOFF 1.5MHz CLK f CUTOFF = 7. FREQUENCY (kHz) LTC1164-5 • G06 CLK 200kHz CLK f CUTOFF 500kHz CLK f CUTOFF 750kHz CLK f CUTOFF 1MHz CLK f CUTOFF E ...

Page 5

... B. f CLK f CUTOFF CLK f CUTOFF D. f CLK f CUTOFF 50 FREQUENCY (kHz) LTC1164-5 • G10 Passband vs Frequency and f CLK A. f CLK f CUTOFF B. f CLK f CUTOFF CLK f CUTOFF D. f CLK f CUTOFF E. f CLK f ...

Page 6

... IN RMS SINGLE 5V SUPPLY –50 50: 500kHz CLK f = 10kHz C (5 REPRESENTATIVE –60 UNITS) –70 –80 –90 –100 FREQUENCY (kHz) LTC1164-5 • G22 THD + Noise vs RMS Input, 100:1 – 1kHz 500kHz CLK –50 SINGLE 5V 5V –60 –70 –80 7.5V –90 –100 0 FREQUENCY (kHz) THD + Noise vs Frequency – ...

Page 7

... CUTOFF 0 –10 – –30 –40 – V –50 –60 –70 –80 –90 20 100 1k 10k FREQUENCY (Hz) LTC1164-5 • G28 Transient Response V = 3V, 500Hz Square Wave IN 1164-5 G30 500 s/DIV BESSEL RATIO = 140 700kHz CLK f = 5kHz 7.5V S 1.25 1.50 ) LTC1164-5 G26 50k 1164-5 G31 ...

Page 8

... OPTIONAL (SEE TEXT) Figure 1. Dual Supply Operation for LTC1164 16V 5 0 10k 7 + 10k 1 F Figure 2. Single Supply Operation for f 8 Clock Input (Pin 11) Any TTL or CMOS clock source with a square-wave output and 50% duty cycle ( 10 adequate clock source for the device. The power supply for the clock source should not be the filter’ ...

Page 9

... W U Table 2. Output Clock Feedthrough V S 2.5V 5V 7.5V Note: The clock feedthrough at 2.5V supplies is imbedded in the wideband noise of the filter. The clock waveform is a square wave. LTC1164-5 – LT1056 1k + 1164-5 F03 Figure 3. Buffer for Filter Output 50:1 100 ...

Page 10

... CLK band. If, for instance, an LTC1164-5 operating with a 100kHz clock and 1kHz cutoff frequency receives a 98kHz 10mV input signal, a 2kHz 56 V alias signal will appear at its output. When the LTC1164-5 operates with a clock-to- cutoff frequency of 50:1, aliasing occurs at twice the clock frequency ...

Page 11

... IN RMS f = 600kHz –50 CLK f = 10kHz C –55 –60 –65 –70 –75 –80 –85 – FREQUENCY (kHz) LTC1164-5 • TA04 0.840 (21.336) MAX 0.220 – 0.310 (5.588 – 7.874 0.200 (5.080) MAX 0.100 0.010 (2.540 0.254) J16 1197 ...

Page 12

... Operates from a Single 3. Supply Optimized for 3V/5V Single Supply Operation, Consumes 1mA at 3V 8th Order Linear Phase Lowpass Filter 140:1 CLK – LTC1164-5 f CLK 0.770* (19.558) MAX 0.255 0.015 ...

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