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1
LTC1164-6
Low Power 8th Order
Pin Selectable Elliptic or
Linear Phase Lowpass Filter
D
U
ESCRIPTIO
S
FEATURE
s
8th Order Pin Selectable Elliptic or Bessel Filter in a
14-Pin Package
s
4mA Supply Current with
5V Supplies
s
64dB Attenuation at 1.44 f
CUTOFF
(Elliptic Response)
s
f
CUTOFF
up to 30kHz (50:1 f
CLK
to f
CUTOFF
Ratio)
s
110
V
RMS
Wideband Noise with
5V Supplies
s
Operates at Single 5V Supply with 1V
RMS
Input Range
s
Operates up to
8V Supplies
s
TTL/CMOS Compatible Clock Input
s
No External Components
U
S
A
O
PPLICATI
s
Anti-Aliasing Filters
s
Battery-Operated Instruments
s
Telecommunication Filters
The LTC1164-6 is a monolithic 8th order elliptic lowpass
filter featuring clock-tunable cutoff frequency and low
power supply current. Low power operation is achieved
without compromising noise or distortion performance.
At
5V supplies the LTC1164-6 uses only 4mA supply
current while keeping wideband noise below 110
V
RMS
.
With a single 5V supply, the LTC1164-6 can provide up to
10kHz cutoff frequency and 80dB signal-to-noise ratio
while consuming only 2.5mA.
The LTC1164-6 provides an elliptic lowpass rolloff with
stopband attenuation of 64dB at 1.44 f
CUTOFF
and an f
CLK
-
to-f
CUTOFF
ratio of 100:1 (pin 10 to V
). For a ratio of 100:1,
f
CUTOFF
can be clock-tuned up to 10kHz. For a f
CLK
-to-
f
CUTOFF
ratio of 50:1 (pin 10 to V
+
), the LTC1164-6
provides an elliptic lowpass filter with f
CUTOFF
frequencies
up to 20kHz. When pin 10 is connected to ground, the
LTC1164-6 approximates an 8th order linear phase re-
sponse with 65dB attenuation at 4.5 f
3dB
and f
CLK
/ f
3dB
ratio of 160:1. The LTC1164-6 is pin compatible with the
LTC1064-1.
U
A
O
PPLICATI
TYPICAL
10kHz Anti-Aliasing Elliptic Filter
Frequency Response
FREQUENCY (kHz)
1
GAIN (dB)
0
10
20
30
40
50
60
70
80
10
100
1164-6 TA02
1
2
3
4
5
6
7
14
13
12
11
10
9
8
LTC1164-6
V
IN
8V
8V
CLK = 1MHz
V
OUT
WIDEBAND NOISE = 115
V
RMS
NOTE: THE CONNECTION FROM PIN 7 TO PIN 14 SHOULD BE MADE
UNDER THE PACKAGE. THE POWER SUPPLIES SHOULD BE BYPASSED
BY A 0.1
F CAPACITOR AS CLOSE TO THE PACKAGE AS POSSIBLE.
1164-6 TA01
NC
NC
8V
2
LTC1164-6
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
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
LTC1164-6C ...................................... 40
C to 85
C
LTC1164-6M ................................... 55
C to 125
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec) ................. 300
C
(Note 1)
ELECTRICAL C
C
HARA TERISTICS
V
S
=
7.5V, R
L
= 10k, T
A
= 25
C, f
CLK
= 400kHz, TTL or CMOS level (maximum clock rise or fall time
1
s) and all gain
measurements are referenced to passband gain,
unless otherwise specified. (f
CLK
/ f
CUTOFF
) = 4kHz at 100:1 and 8kHz at 50:1.
W
U
U
PACKAGE/ORDER I FOR ATIO
1
2
3
4
5
6
7
TOP VIEW
N PACKAGE
14-LEAD PLASTIC DIP
14
13
12
11
10
9
8
NC
V
IN
GND
V
+
GND
LP6
CONNECT 1
CONNECT 2
NC
V
CLK
ELL/BESS
V
OUT
NC
J PACKAGE
14-LEAD CERAMIC DIP
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Passband Gain 0.1Hz to 0.25 f
CUTOFF
(Note 4)
f
IN
= 1kHz, (f
CLK
/ f
C
) = 100:1
q
0.50
0.15
0.25
dB
Passband Ripple with V
S
= Single 5V
1Hz to 0.8 f
C
(Table 2)
0.1 to 0.3
dB
Gain at 0.50 f
CUTOFF
(Note 3)
f
IN
= 2kHz, (f
CLK
/ f
C
) = 100:1
q
0.45
0.10
0.10
dB
Gain at 0.90 f
CUTOFF
(Note 3)
f
IN
= 3.6kHz, (f
CLK
/ f
C
) = 100:1
q
0.75
0.30
0.10
dB
Gain at 0.95 f
CUTOFF
(Note 3)
f
IN
= 3.8kHz, (f
CLK
/ f
C
) = 100:1
q
1.40
0.70
0.40
dB
Gain at f
CUTOFF
(Note 3)
f
IN
= 4kHz, (f
CLK
/ f
C
) = 100:1
q
3.50
2.70
2.30
dB
f
IN
= 8kHz, (f
CLK
/ f
C
) = 50:1
q
3.00
2.10
1.50
dB
Gain at 1.44 f
CUTOFF
(Note 3)
f
IN
= 5.76kHz, (f
CLK
/ f
C
) = 100:1
q
69
64
58
dB
Gain at 2.0 f
CUTOFF
(Note 3)
f
IN
= 8kHz, (f
CLK
/ f
C
) = 100:1
q
69
64
58
dB
Gain with f
CLK
= 20kHz
f
IN
= 200Hz, (f
CLK
/ f
C
) = 100:1
3.50
2.70
2.30
dB
Gain with V
S
=
2.375V
f
IN
= 400kHz, f
IN
= 2kHz, (f
CLK
/ f
C
) = 100:1
0.50
0.10
0.30
dB
f
IN
= 400kHz, f
IN
= 4kHz, (f
CLK
/ f
C
) = 100:1
3.30
2.50
2.00
dB
Input Frequency Range (Tables 3, 4)
(f
CLK
/ f
C
) = 100:1
0 <f
CLK
/2
kHz
(f
CLK
/ f
C
) = 50:1
0 <f
CLK
kHz
Maximum f
CLK
(Table 3)
V
S
7.5V
1.5
MHz
V
S
5V
1.0
MHz
V
S
= Single 5V, AGND = 2V
1.0
MHz
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SOL
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
V
IN
GND
V
+
GND
NC
LP6
CONNECT 1
CONNECT 2
NC
V
NC
CLK
ELL/BESS
NC
V
OUT
LTC1164-6CN
LTC1164-6CJ
LTC1164-6MJ
T
JMAX
= 110
C,
JA
= 85
C/W
T
JMAX
= 150
C,
JA
= 65
C/ W (J)
T
JMAX
= 110
C,
JA
= 65
C/ W (N)
ORDER PART
NUMBER
ORDER PART
NUMBER
LTC1164-6CS
3
LTC1164-6
ELECTRICAL C
C
HARA TERISTICS
V
S
=
7.5V, R
L
= 10k, T
A
= 25
C, f
CLK
= 400kHz, TTL or CMOS level (maximum clock rise or fall time
1
s) and all gain
measurements are referenced to passband gain,
unless otherwise specified. (f
CLK
/ f
CUTOFF
) = 4kHz at 100:1 and 8kHz at 50:1.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Clock Feedthrough
Input at GND, f = f
CLK
, Square Wave
V
S
=
7.5V, (f
CLK
/ f
C
) = 100:1
500
V
RMS
V
S
=
5V, (f
CLK
/ f
C
) = 50:1
200
V
RMS
Wideband Noise
Input at GND, 1Hz
f < f
CLK
V
S
=
7.5V
115
5%
V
RMS
V
S
=
2.5V
100
5%
V
RMS
Input Impedance
30
40
70
k
Output DC Voltage Swing
V
S
=
2.375V
q
1.25
1.50
V
V
S
=
5V
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
100
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
=
5V, 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
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 latch-up. It is recommended that no sources operating from
external supplies be applied prior to power-up of the LTC1164-6.
Note 3: All gains are measured relative to passband gain.
Note 4: The cutoff frequency of the filter is abbreviated as f
CUTOFF
or f
C
.
Stopband Gain vs Frequency
(Elliptic Response)
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Stopband Gain vs Frequency
(Elliptic Response)
FREQUENCY (kHz)
2
GAIN (dB)
10
0
10
20
30
40
50
60
70
80
90
18
1164-6 G02
6
10
14
22
4
8
12
16
20
V
S
= 5V
f
CLK
= 250kHz
(f
CLK
/f
C
) = 50:1
(PIN 10 AT V
+
)
T
A
= 25C
WITH EXTERNAL
SINGLE POLE LOW-
PASS RC FILTER
(f
3dB
= 10kHz)
FREQUENCY (kHz)
GAIN (dB)
10
0
10
20
30
40
50
60
70
80
90
1164-6 G01
2
18
6
10
14
22
4
8
12
16
20
V
S
= 5V
f
CLK
= 500kHz
f
C
= 5kHz
(f
CLK
/f
C
) = 100:1
(PIN 10 AT V
)
T
A
= 25C
4
LTC1164-6
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Passband Gain vs Frequency
FREQUENCY (kHz)
0.4
GAIN (dB)
1.0
1.6
2.2
2.8
1164-6 G05
3.4
0.8
0.4
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
4.0
V
S
= 5V
f
CLK
= 500kHz
f
C
= 5kHz
(f
CLK
/f
C
) = 100:1
(PIN 10 AT V
)
T
A
= 25C
(10 REPRESENTA-
TIVE UNITS)
Maximum Passband over
Temperature
FREQUENCY (kHz)
1
GAIN (dB)
5
1164-6 G07
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
10
A
B
V
S
= 5V
f
CLK
= 1MHz
f
C
= 10kHz
(f
CLK
/f
C
) = 100:1
(PIN 10 AT V
)
A.T
A
= 125C
B.T
A
= 85C
D.T
A
= 40C
C
FREQUENCY (kHz)
1
GAIN (dB)
5
1164-6 G11
3
4
PHASE (DEG)
3
2
1
0
1
2
3
4
5
6
7
2
V
S
= 5V
f
CLK
= 800kHz
f
C
= 5kHz
(f
CLK
/f
C
) = 160:1
(PIN 10 AT GND)
T
A
= 25C
0
30
60
90
120
150
180
210
240
270
300
PHASE
GAIN
Passband Gain and Phase vs
Frequency (Linear Phase Response)
Passband Gain and Phase vs
Frequency and f
CLK
FREQUENCY (kHz)
GAIN (dB)
3
2
1
0
1
2
3
4
5
6
7
8
9
1
2
1164-6 G08
3
4
5
0
45
90
135
180
225
270
315
360
405
450
495
540
PHASE (DEG)
PHASE
B
B
A
A
V
S
= 5V
f
CLK
= 250kHz
f
C
= 5kHz
(f
CLK
/f
C
) = 50:1
(PIN 10 AT V
)
T
A
= 25C
A.RESPONSE WITHOUT
EXTERNAL SINGLE
POLE RC FILTER
B.RESPONSE WITH AN
EXTERNAL SINGLE
POLE LOWPASS RC
FILTER (f
3dB
AT 10kHz)
Passband vs Frequency and f
CLK
INPUT FREQUENCY (kHz)
1
GAIN (dB)
5
1
164-6 G06
2.0
1.5
1.0
0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
10
A
B
C
D
V
S
= 5V
(f
CLK
/f
C
) = 100:1
(PIN 10 AT V
)
T
A
= 25C
A. f
CLK
= 400kHz
f
CUTOFF
= 4kHz
B. f
CLK
= 600kHz
f
CUTOFF
= 6kHz
C. f
CLK
= 800kHz
f
CUTOFF
= 8kHz
D. f
CLK
= 1MHz
f
CUTOFF
= 10kHz
Stopband Gain vs Frequency
(Linear Phase Response)
FREQUENCY (kHz)
2
GAIN (dB)
10
0
10
20
30
40
50
60
70
80
90
34
1164-6 G03
10
18
26
42
6
14
22
30
38
V
S
= 5V
f
CLK
= 800kHz
f
C
= 5kHz
(f
CLK
/f
C
) = 160:1
(PIN 10 AT GND)
T
A
= 25C
A.RESPONSE WITHOUT
EXTERNAL RC FILTER
B.RESPONSE WITH AN
EXTERNAL SINGLE
POLE LOWPASS RC
FILTER (f
3dB
AT 10kHz)
A
B
Passband Gain and Phase
vs Frequency
FREQUENCY (kHz)
1
GAIN (dB)
5
1164-6 G04
3
4
PHASE (DEG)
2.0
1.5
1.0
0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
2
V
S
= 5V
f
CLK
= 500kHz
f
C
= 5kHz
(f
CLK
/f
C
) = 100:1
(PIN 10 AT V
)
T
A
= 25C
0
45
90
135
180
225
270
315
360
405
450
5
LTC1164-6
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Group Delay vs Frequency
(Linear Phase Response)
FREQUENCY (kHz)
1
GROUP DELAY (
s)
250
200
150
100
50
0
9
1164-6 G22
3
5
7
11
2
4
6
8
10
f
CLK
= 800kHz
(f
CLK
/f
C
) = 160:1
f
C
= 5kHz
Group Delay vs Frequency
(Elliptic Response)
FREQUENCY (kHz)
1
GROUP DELAY (
s)
5
1164-6 G12
3
4
700
600
500
400
300
200
100
0
2
B
A
V
S
= 5V
f
C
= 5kHz
T
A
= 25C
A.f
CLK
= 250kHz, (f
CLK
/f
C
) = 50:1
WITH EXTERNAL RC LOWPASS
FILTER (f
C
= 10kHz)
B.f
CLK
= 500kHz
(f
CLK
/f
C
) = 100:1
FREQUENCY (kHz)
1
THD + NOISE (dB)
2
5
1164-6 G13
40
45
50
55
60
65
70
75
80
85
90
3
4
V
S
= 5V, V
IN
= 1V
RMS
(20k RESISTOR PIN 14 TO V
)
f
CLK
= 500kHz, f
C
= 5kHz
(f
CLK
/f
C
) = 100:1, T
A
= 25C
(5 REPRESENTATIVE UNITS)
THD + Noise vs Frequency
(Elliptic Response)
FREQUENCY (kHz)
1
THD + NOISE (dB)
5
1164-6 G14
40
45
50
55
60
65
70
75
80
85
90
10
V
S
= 5V, V
IN
= 1V
RMS
,
f
CLK
= 500kHz, f
C
= 10kHz,
(f
CLK
/f
C
) = 50:1, T
A
= 25C,
WITH EXTERNAL RC LOWPASS
FILTER (f
3dB
= 20kHz)
(5 REPRESENTATIVE UNITS)
THD + Noise vs Frequency
(Elliptic Response)
THD + Noise vs Frequency
(Elliptic Response)
Maximum Passband over
Temperature
FREQUENCY (kHz)
GAIN (dB)
1164-6 G10
2.0
1.5
1.0
0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
V
S
= SINGLE 5V
(f
CLK
/f
C
) = 50:1
GND = 2V WITH
EXTERNAL RC
LOWPASS FILTER
(f
3dB
= 40kHz)
2
18
6
10
14
22
4
8
12
16
20
T
A
= 40C
T
A
= 70C
Passband vs Frequency and f
CLK
FREQUENCY (kHz)
1
GAIN (dB)
10
1164-6 G09
2.0
1.5
1.0
0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
V
S
= 8V
(f
CLK
/f
C
) = 50:1
(PIN 10 AT V
+
)
T
A
= 25C
30
A. f
CLK
= 250kHz
f
CUTOFF
= 5kHz
B. f
CLK
= 500kHz
f
CUTOFF
= 10kHz
C. f
CLK
= 1MHz
f
CUTOFF
= 20kHz
A
C
B
FREQUENCY (kHz)
1
THD + NOISE (dB)
2
5
1164-6 G23
40
45
50
55
60
65
70
75
80
85
90
3
4
V
S
= 5V
V
IN
= 1V
RMS
f
CLK
= 800kHz
f
C
= 5kHz
(f
CLK
/f
C
) = 160:1
T
A
= 25C
THD + Noise vs Frequency
(Linear Phase Response)
FREQUENCY (kHz)
THD + NOISE (dB)
1164-6 G16
40
45
50
55
60
65
70
75
80
85
90
0.5
1
5
V
S
= SINGLE 5V, V
IN
= 0.7V
RMS
f
CLK
= 500kHz, f
C
= 5kHz,
(f
CLK
/f
C
) = 100:1, T
A
= 25C
(5 REPRESENTATIVE UNITS)
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