LTC1164-5
Low Power 8th Order
Pin Selectable Butterworth
or Bessel Lowpass Filter
DESCRIPTIO
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
s
s
s
s
s
s
s
s
s
s
Pin Selectable Butterworth or Bessel Response
4mA Supply Current with
±5V
Supplies
f
CUTOFF
up to 20kHz
100µV
RMS
Wideband Noise
THD < 0.02% (50:1, V
S
=
±7.5V,
V
IN
= 2V
RMS
)
Operates with a Single 5V Supply (1V
RMS
Input
Range)
60µV
RMS
Clock Feedthrough (Single 5V Supply)
Operates up to
±8V
Supplies
TTL/CMOS-Compatible Clock Input
No External Components
APPLICATIO S
s
s
s
s
Anti-Aliasing Filters
Battery-Operated Instruments
Telecommunications Filters
Smoothing Filters
TYPICAL APPLICATIO
1
V
IN
2
3
8V
4
5
NC
6
7
LTC1164-5
14
Butterworth 20kHz Anti-Aliasing Filter
12
11
10
9
8
GAIN (dB)
13
–8V
CLK = 1MHz
TO V
+
V
OUT
WIDEBAND NOISE = 110µV
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 0.1µF CAPACITOR AS
CLOSE TO THE PACKAGE AS POSSIBLE.
1164-5 TA01
U
U
U
Frequency Response
0
–10
–20
–30
–40
–50
–60
–70
–80
1
10
FREQUENCY (kHz)
100
LTC1164-5 TA02
1
LTC1164-5
ABSOLUTE
AXI U RATI GS
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
50:1 MODE
V
IN
GND
V
+
GND
LP6
CONNECT 1
1
2
3
4
5
6
7
14 CONNECT 2
13 50:1 MODE
12 V
–
11 CLK
10 BUTT/BESS
9
8
V
OUT
NC
ORDER PART
NUMBER
LTC1164-5CN
LTC1164-5CJ
LTC1164-5MJ
J PACKAGE
14-LEAD CERDIP
N PACKAGE
14-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 65°C/W (J)
T
JMAX
= 110°C,
θ
JA
= 65°C/W (N)
Consult factory for Industrial grade parts.
ELECTRICAL CHARACTERISTICS
V
S
=
±7.5V,
R
L
= 10k, f
CLK
= 400kHz, T
A
= Operating Temperature Range, unless otherwise specified.
PARAMETER
Passband Gain 0.1Hz at 0.25f
CUTOFF
(Note 3)
Gain at 0.50f
CUTOFF
(Note 3)
Gain at 0.90f
CUTOFF
(Note 3)
Gain at 0.95f
CUTOFF
(Note 3)
Gain at f
CUTOFF
(Note 3)
Gain at 1.44f
CUTOFF
(Note 3)
Gain at 2.0f
CUTOFF
(Note 3)
Gain with f
CLK
= 20kHz (Note 3)
Gain with V
S
= 2.375V (Note 3)
Input Frequency Range
CONDITIONS
f
IN
= 1kHz, (f
CLK
/f
C
) = 100:1
f
IN
= 1kHz, (f
CLK
/f
C
) = 50:1
f
IN
= 2kHz, (f
CLK
/f
C
) = 100:1
f
IN
= 4kHz, (f
CLK
/f
C
) = 50:1
f
IN
= 3.6kHz, (f
CLK
/f
C
) = 100:1
f
IN
= 3.8kHz, (f
CLK
/f
C
) = 100:1
f
IN
= 4kHz, (f
CLK
/f
C
) = 100:1
f
IN
= 8kHz, (f
CLK
/f
C
) = 50:1
f
IN
= 5.76kHz, (f
CLK
/f
C
) = 100:1
f
IN
= 8kHz, (f
CLK
/f
C
) = 100:1
f
IN
= 200Hz, (f
CLK
/f
C
) = 100:1
f
IN
= 400kHz, f
IN
= 2kHz, (f
CLK
/f
C
) = 100:1
f
IN
= 400kHz, f
IN
= 4kHz, (f
CLK
/f
C
) = 100:1
(f
CLK
/f
C
) = 100:1
(f
CLK
/f
C
) = 50:1
q
q
q
q
q
q
q
q
q
q
2
U
U
W
W W
U
W
(Note 1)
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
TOP VIEW
50:1 MODE 1
V
IN
2
GND 3
V
+
4
GND 5
NC 6
LP6 7
CONNECT 1 8
S PACKAGE
16-LEAD PLASTIC SW
T
JMAX
= 110°C,
θ
JA
= 85°C/W
16 CONNECT 2
15 50:1 MODE
14 V
–
13 NC
12 CLK
11 BUTT/BESS
10 NC
9
V
OUT
ORDER PART
NUMBER
LTC1164-5CS
MIN
– 0.5
– 0.5
– 0.45
– 0.35
– 2.50
– 4.10
– 4.20
– 20.5
– 45.0
– 4.50
– 0.50
– 4.20
LTC1164-5C
TYP
– 0.10
0.10
– 0.20
– 0.10
–1.90
– 2.60
– 3.40
– 3.80
–19.0
– 43.0
– 3.40
– 0.10
– 3.40
0 – <f
CLK
/2
0 – <f
CLK
MAX
0.25
0.25
0.17
0.40
–1.0
– 2.75
– 2.75
–17.0
– 41.0
– 2.75
0.35
– 2.00
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
kHz
kHz
LTC1164-5
ELECTRICAL CHARACTERISTICS
V
S
=
±7.5V,
R
L
= 10k, f
CLK
= 400kHz, T
A
= Operating Temperature Range, unless otherwise specified.
PARAMETER
Maximum f
CLK
CONDITIONS
V
S
≥ ±7.5V
V
S
=
±5.0V
V
S
= Single 5V (GND = 2V)
Input at GND, f = f
CLK
, Square Wave
±5V,
(f
CLK
/f
C
) = 100:1
±5V,
(f
CLK
/f
C
) = 50:1
Input at GND, 1Hz
≥
f < f
CLK
±5V,
(f
CLK
/f
C
) = 100:1
±5V,
(f
CLK
/f
C
) = 50:1
70
V
S
=
±2.375V
V
S
=
±5.0V
V
S
=
±7.5V
V
S
=
±5V,
(f
CLK
/f
C
) = 100:1
V
S
=
±5V,
(f
CLK
/f
C
) = 100:1
V
S
=
±2.375V,
T
A
≥
25°C
q
q
q
q
MIN
LTC1164-5C
TYP
1.5
1.0
1.0
200
100
100
±5%
115
±5%
100
±1.50
±4.10
±5.90
±
50
±100
2.5
4.5
MAX
UNITS
MHz
MHz
MHz
µV
RMS
µV
RMS
µV
RMS
µV
RMS
Clock Feedthrough
Wideband Noise
Input Impedance
Output DC Voltage Swing
160
kΩ
V
V
V
±1.25
±3.70
±5.40
Output DC Offset
Output DC Offset TempCo
Power Supply Current
±160
4.0
4.5
7.0
8.0
11.0
12.5
±8
mV
µV/°C
mA
mA
mA
mA
mA
mA
V
V
S
=
±5.0V,
T
A
≥
25°C
q
V
S
=
±7.5V,
T
A
≥
25°C
q
7.0
±2.375
Power Supply Range
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
.
TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency
0
–10
–20
A
B
C
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)
GAIN (dB)
–40
–50
–60
–70
–80
0.1
V
S
=
±5V
T
A
= 25°C
1
10
FREQUENCY (kHz)
50
GAIN (dB)
–30
U W
Passband Gain and Phase
vs Frequency
0
GAIN
0
PHASE (DEG)
–5
–90
–10
–15
V
S
=
±5V
f
CLK
= 50kHz
f
CUTOFF
= 1kHz
(50:1, PIN 10 TO V
+
,
PINS 1-13 SHORTED)
T
A
= 25°C
0.2
–180
PHASE
–270
0.4
0.8
0.6
FREQUENCY (kHz)
1.0
LTC1164-5 • G02
LTC1164-5 • G01
3
Microcontroller MCU
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