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1
LTC1164-5
Low Power 8th Order
Pin Selectable Butterworth
or Bessel Lowpass Filter
Butterworth 20kHz Anti-Aliasing Filter
s
Pin Selectable Butterworth or Bessel Response
s
4mA Supply Current with
5V Supplies
s
f
CUTOFF
up to 20kHz
s
100
V
RMS
Wideband Noise
s
THD < 0.02% (50:1, V
S
=
7.5V, V
IN
= 2V
RMS
)
s
Operates with a Single 5V Supply (1V
RMS
Input
Range)
s
60
V
RMS
Clock Feedthrough (Single 5V Supply)
s
Operates up to
8V Supplies
s
TTL/CMOS-Compatible Clock Input
s
No External Components
The LTC
1164-5 is a monolithic 8th order filter; it approxi-
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
) or 50:1 double-sampled (Pin 10 to V
+
and
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.
Frequency Response
1
2
3
4
5
6
7
14
13
12
11
10
9
8
LTC1164-5
V
IN
8V
NC
8V
CLK = 1MHz
TO V
+
V
OUT
WIDEBAND NOISE = 110
V
RMS
THD IN PASSBAND < 0.02% AT V
IN
= 2V
RMS
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.
1164-5 TA01
FREQUENCY (kHz)
1
GAIN (dB)
0
10
20
30
40
50
60
70
80
10
100
LTC1164-5 TA02
s
Anti-Aliasing Filters
s
Battery-Operated Instruments
s
Telecommunications Filters
s
Smoothing Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
APPLICATIO S
U
DESCRIPTIO
U
TYPICAL APPLICATIO
U
2
LTC1164-5
Total Supply Voltage (V
+
to V
) ............................. 16V
Input Voltage (Note 2) ......... (V
+
+ 0.3V) to (V
0.3V)
Output Short Circuit Duration ......................... Indefinite
Power Dissipation ............................................. 400mW
Burn-In Voltage ...................................................... 16V
Operating Temperature Range
LTC1164-5C ...................................... 40
C to 85
C
LTC1164-5M .................................... 55
C to 125
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec)................. 300
C
ABSOLUTE AXI U
RATI GS
W
W
W
U
(Note 1)
LTC1164-5C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Passband Gain 0.1Hz at 0.25f
CUTOFF
(Note 3)
f
IN
= 1kHz, (f
CLK
/f
C
) = 100:1
q
0.5
0.10
0.25
dB
f
IN
= 1kHz, (f
CLK
/f
C
) = 50:1
q
0.5
0.10
0.25
dB
Gain at 0.50f
CUTOFF
(Note 3)
f
IN
= 2kHz, (f
CLK
/f
C
) = 100:1
q
0.45
0.20
0.17
dB
f
IN
= 4kHz, (f
CLK
/f
C
) = 50:1
q
0.35
0.10
0.40
dB
Gain at 0.90f
CUTOFF
(Note 3)
f
IN
= 3.6kHz, (f
CLK
/f
C
) = 100:1
q
2.50
1.90
1.0
dB
Gain at 0.95f
CUTOFF
(Note 3)
f
IN
= 3.8kHz, (f
CLK
/f
C
) = 100:1
2.60
dB
Gain at f
CUTOFF
(Note 3)
f
IN
= 4kHz, (f
CLK
/f
C
) = 100:1
q
4.10
3.40
2.75
dB
f
IN
= 8kHz, (f
CLK
/f
C
) = 50:1
q
4.20
3.80
2.75
dB
Gain at 1.44f
CUTOFF
(Note 3)
f
IN
= 5.76kHz, (f
CLK
/f
C
) = 100:1
q
20.5
19.0
17.0
dB
Gain at 2.0f
CUTOFF
(Note 3)
f
IN
= 8kHz, (f
CLK
/f
C
) = 100:1
q
45.0
43.0
41.0
dB
Gain with f
CLK
= 20kHz (Note 3)
f
IN
= 200Hz, (f
CLK
/f
C
) = 100:1
q
4.50
3.40
2.75
dB
Gain with V
S
= 2.375V (Note 3)
f
IN
= 400kHz, f
IN
= 2kHz, (f
CLK
/f
C
) = 100:1
0.50
0.10
0.35
dB
f
IN
= 400kHz, f
IN
= 4kHz, (f
CLK
/f
C
) = 100:1
4.20
3.40
2.00
dB
Input Frequency Range
(f
CLK
/f
C
) = 100:1
0 <f
CLK
/2
kHz
(f
CLK
/f
C
) = 50:1
0 <f
CLK
kHz
V
S
=
7.5V, R
L
= 10k, f
CLK
= 400kHz, T
A
= Operating Temperature Range, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
ORDER PART
NUMBER
ORDER PART
NUMBER
T
JMAX
= 110
C,
JA
= 85
C/W
LTC1164-5CN
LTC1164-5CJ
LTC1164-5MJ
LTC1164-5CS
PACKAGE/ORDER I FOR ATIO
U
U
W
1
2
3
4
5
6
7
TOP VIEW
J PACKAGE
14-LEAD CERDIP
N PACKAGE
14-LEAD PDIP
14
13
12
11
10
9
8
50:1 MODE
V
IN
GND
V
+
GND
LP6
CONNECT 1
CONNECT 2
50:1 MODE
V
CLK
BUTT/BESS
V
OUT
NC
1
2
3
4
5
6
7
8
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SW
16
15
14
13
12
11
10
9
50:1 MODE
V
IN
GND
V
+
GND
NC
LP6
CONNECT 1
CONNECT 2
50:1 MODE
V
NC
CLK
BUTT/BESS
NC
V
OUT
T
JMAX
= 150
C,
JA
= 65
C/W (J)
T
JMAX
= 110
C,
JA
= 65
C/W (N)
Consult factory for Industrial grade parts.
3
LTC1164-5
V
S
=
7.5V, R
L
= 10k, f
CLK
= 400kHz, T
A
= Operating Temperature Range, unless otherwise specified.
LTC1164-5C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum f
CLK
V
S
7.5V
1.5
MHz
V
S
=
5.0V
1.0
MHz
V
S
= Single 5V (GND = 2V)
1.0
MHz
Clock Feedthrough
Input at GND, f = f
CLK
, Square Wave
5V, (f
CLK
/f
C
) = 100:1
200
V
RMS
5V, (f
CLK
/f
C
) = 50:1
100
V
RMS
Wideband Noise
Input at GND, 1Hz
f < f
CLK
5V, (f
CLK
/f
C
) = 100:1
100
5%
V
RMS
5V, (f
CLK
/f
C
) = 50:1
115
5%
V
RMS
Input Impedance
70
100
160
k
Output DC Voltage Swing
V
S
=
2.375V
q
1.25
1.50
V
V
S
=
5.0V
q
3.70
4.10
V
V
S
=
7.5V
q
5.40
5.90
V
Output DC Offset
V
S
=
5V, (f
CLK
/f
C
) = 100:1
50
160
mV
Output DC Offset TempCo
V
S
=
5V, (f
CLK
/f
C
) = 100:1
100
V/
C
Power Supply Current
V
S
=
2.375V, T
A
25
C
2.5
4.0
mA
q
4.5
mA
V
S
=
5.0V, T
A
25
C
4.5
7.0
mA
q
8.0
mA
V
S
=
7.5V, T
A
25
C
7.0
11.0
mA
q
12.5
mA
Power Supply Range
2.375
8
V
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which life of
the device may be impaired.
Note 2: Connecting any pin to voltages greater than V
+
or less than V
may cause latchup. It is recommended that no sources operating from
external supplies be applied prior to power-up of the LTC1164-5.
Note 3: All gains are measured relative to passband gain. The filter cutoff
frequency is abbreviated as f
CUTOFF
or f
C
.
FREQUENCY (kHz)
0.2
GAIN (dB)
5
0
1.0
LTC1164-5 G02
10
15
0.4
0.6
0.8
90
0
180
270
PHASE (DEG)
GAIN
PHASE
V
S
=
5V
f
CLK
= 50kHz
f
CUTOFF
= 1kHz
(50:1, PIN 10 TO V
+
,
PINS 1-13 SHORTED)
T
A
= 25
C
FREQUENCY (kHz)
0.1
50
GAIN (dB)
40
30
20
10
1
10
LTC1164-5 G01
60
70
80
0
A. f
CLK
= 100kHz
f
CUTOFF
= 1kHz
(100:1, PIN 10 TO V )
B. f
CLK
= 375kHz
f
CUTOFF
= 2.68kHz
(140:1, PIN 10 GND)
C. f
CLK
= 500kHz
f
CUTOFF
= 10kHz
(50:1, PIN 10 TO V+,
PINS 1-13 SHORTED)
A
C
B
V
S
=
5V
T
A
= 25
C
50
Gain vs Frequency
Passband Gain and Phase
vs Frequency
4
LTC1164-5
Passband Gain and Phase
vs Frequency
Passband Gain and Phase
vs Frequency
FREQUENCY (kHz)
0.2
GAIN (dB)
5
0
1.0
LTC1164-5 G03
10
15
0.4
0.6
0.8
90
0
180
270
PHASE (DEG)
V
S
=
5V
f
CLK
= 100kHz
f
CUTOFF
= 1kHz
(100:1, PIN 10 TO V
)
T
A
= 25
C
20
360
FREQUENCY (kHz)
0.2
GAIN (dB)
5
0
1.0
LTC1164-5 G04
10
15
20
0.4
0.6
0.8
90
0
180
270
360
PHASE (DEG)
V
S
=
5V
f
CLK
= 150kHz
f
CUTOFF
= 1.07kHz
(140:1, PIN 10 TO GND)
T
A
= 25
C
GAIN
PHASE
Maximum Passband over
Temperature for V
S
=
7.5V, 50:1
Passband vs Frequency and f
CLK
Passband vs Frequency and f
CLK
Group Delay vs Frequency
FREQUENCY (kHz)
0.1
4.0
GAIN (dB)
3.5
2.5
2.0
1.5
0.5
1
10
LTC1164-5 G06
3.0
0
0.5
1.0
A
E
F
B
C
D
A. f
CLK
= 200kHz
f
CUTOFF
= 4kHz
B. f
CLK
= 300kHz
f
CUTOFF
= 6kHz
C. f
CLK
= 500kHz
f
CUTOFF
= 10kHz
D. f
CLK
= 750kHz
f
CUTOFF
= 15kHz
E. f
CLK
= 1MHz
f
CUTOFF
= 20kHz
F. f
CLK
= 1.5MHz
f
CUTOFF
= 30kHz
V
S
=
7.5V
50:1
T
A
= 25
C
30
FREQUENCY (kHz)
0.5
0
GROUP DELAY (
s)
50
150
200
250
500
350
2.5
4.5
5.5
LTC1164-5 G05
100
400
450
300
1.5
3.5
6.5
7.5
V
S
=
7.5V
T
A
= 25
C
A
B
A. f
CLK
= 500kHz
(BUTTERWORTH 100:1)
f
CUTOFF
= 5kHz
B. f
CLK
= 750kHz
(BESSEL 140:1)
f
CUTOFF
= 5.36kHz
FREQUENCY (kHz)
0.1
4.0
GAIN (dB)
3.5
2.5
2.0
1.5
0.5
1
10
LTC1164-5 G08
3.0
0
1.0
A
E
B
C D
A. f
CLK
= 200kHz
f
CUTOFF
= 2kHz
B. f
CLK
= 500kHz
f
CUTOFF
= 5kHz
C. f
CLK
= 750kHz
f
CUTOFF
= 7.5kHz
D. f
CLK
= 1MHz
f
CUTOFF
= 10kHz
E. f
CLK
= 1.5MHz
f
CUTOFF
= 15kHz
V
S
=
7.5V
100:1
T
A
= 25
C
0.5
20
FREQUENCY (kHz)
1
4.0
GAIN (dB)
3.5
2.5
2.0
1.5
0.5
10
LTC1164-5 G07
3.0
0
0.5
1.0
V
S
=
7.5V
f
CLK
= 1.5MHz (50:1)
f
CUTOFF
= 30kHz
T
A
= 40
C
T
A
= 70
C
30
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
5
LTC1164-5
Passband vs Frequency and f
CLK
FREQUENCY (kHz)
0.1
4.0
GAIN (dB)
3.0
2.0
1.0
0
1
10
LTC1164-5 G09
3.5
2.5
1.5
0.5
0.5
A. f
CLK
= 150kHz
f
CUTOFF
= 1.07kHz
B. f
CLK
= 450kHz
f
CUTOFF
= 3.21kHz
C. f
CLK
= 750kHz
f
CUTOFF
= 5.36kHz
D. f
CLK
= 1MHz
f
CUTOFF
= 7.14kHz
E. f
CLK
= 1.5MHz
f
CUTOFF
= 10.71kHz
V
S
=
7.5V, 140:1
(BESSEL RESPONSE)
T
A
= 25
C
B
D
A
C
E
FREQUENCY (kHz)
1
GAIN (dB)
1.0
0
LTC1164-5 G10
2.0
3.0
4.0
10
1.5
0.5
0.5
2.5
3.5
A. f
CLK
= 250kHz
f
CUTOFF
= 5kHz
B. f
CLK
= 500kHz
f
CUTOFF
= 10kHz
C. f
CLK
= 750kHz
f
CUTOFF
= 15kHz
D. f
CLK
= 1MHz
f
CUTOFF
= 20kHz
V
S
=
5V
50:1
T
A
= 25
C
A
B
C
D
20
Passband vs Frequency and f
CLK
Passband vs Frequency and f
CLK
Maximum Passband over
Temperature for V
S
=
5V, 50:1
FREQUENCY (kHz)
1
4.0
GAIN (dB)
3.0
2.0
1.0
0
10
LTC1164-5 G011
3.5
2.5
1.5
0.5
0.5
V
S
=
5V
f
CLK
= 1MHz
f
CUTOFF
= 20kHz
T
A
= 40
C
T
A
= 70
C
20
FREQUENCY (kHz)
0.1
4.0
GAIN (dB)
3.0
2.0
1.0
0
1
10
LTC1164-5 G12
3.5
2.5
1.5
0.5
0.5
B
A
D
C
E
A. f
CLK
= 200kHz
f
CUTOFF
= 2kHz
B. f
CLK
= 300kHz
f
CUTOFF
= 3kHz
C. f
CLK
= 500kHz
f
CUTOFF
= 5kHz
D. f
CLK
= 750kHz
f
CUTOFF
= 7.5kHz
E. f
CLK
= 1MHz
f
CUTOFF
= 10kHz
V
S
=
5V
100:1
T
A
= 25
C
Maximum Passband over
Temperature for V
S
=
5V, 100:1
Passband vs Frequency and f
CLK
FREQUENCY (kHz)
0.5
4.0
GAIN (dB)
3.0
2.0
1.0
0
1 10
LTC1164-5 G13
3.5
2.5
1.5
0.5
0.5
V
S
=
5V
f
CLK
= 1MHz (100:1)
f
CUTOFF
= 10kHz
T
A
= 40
C
T
A
= 70
C
FREQUENCY (kHz)
1
4.0
GAIN (dB)
3.0
2.0
1.0
0
10
LTC1164-5 G14
3.5
2.5
1.5
0.5
0.5
D
A
C
B
A. f
CLK
= 250kHz
f
CUTOFF
= 5kHz
B. f
CLK
= 500kHz
f
CUTOFF
= 10kHz
C. f
CLK
= 750kHz
f
CUTOFF
= 15kHz
D. f
CLK
= 1MHz
f
CUTOFF
= 20kHz
V
S
= SINGLE 5V
50:1
T
A
= 25
C
20
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
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