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LTC1062CSW#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC1062
1062fd
10Hz 5th Order Butterworth Lowpass Filter Filter Amplitude Response and Noise
■
Lowpass Filter with No DC Error
■
Low Passband Noise
■
Operates DC to 20kHz
■
Operates On a Single 5V Supply or Up to ±8V
■
5th Order Filter
■
Maximally Flat Response
■
Internal or External Clock
■
Cascadable for Faster Rolloff
■
Buffer Available
The LTC
®
1062 is a 5th order all pole maximally flat
lowpass filter with no DC error. Its unusual architecture
puts the filter outside the DC path so DC offset and low
frequency noise problems are eliminated. This makes the
LTC1062 very useful for lowpass filters where DC accuracy
is important.
The filter input and output are simultaneously taken across
an external resistor. The LTC1062 is coupled to the signal
through an external capacitor. This RC reacts with the
internal switched capacitor network to form a 5th order
rolloff at the output.
The filter cutoff frequency is set by an internal clock that
can be externally driven. The clock-to-cutoff frequency
ratio is typically 100:1, allowing the clock ripple to be
easily removed.
Two LTC1062s can be cascaded to form a 10th order quasi
max flat lowpass filter. The device can be operated with
single or dual supplies ranging from ±2.5V to ±9V.
The LTC1062 is manufactured using Linear Technology’s
enhanced LTCMOS
TM
silicon gate process.
■
60Hz Lowpass Filters
■
Antialiasing Filter
■
Low Level Filtering
■
Rolling Off AC Signals from High DC Voltages
■
Digital Voltmeters
■
Scales
■
Strain Gauges
LTCMOS is a trademark of Linear Technology Corporation.
FB
AGND
V
–
DIVIDER
RATIO
B
OUT
OUT
V
+
C
OSC
1
2
3
4
8
7
6
5
LTC1062
C
OSC=
3900pF
1062 TA01
1µF
V
IN
25.8k
V
+
= 5V
V
–
= –5V
DC ACCURATE
OUTPUT
BUFFERED
OUTPUT
NOTE: TO ADJUST OSCILLATOR FREQUENCY,
USE A 6800pF CAPACITOR IN SERIES
WITH A 50k POT FROM PIN 5 TO GROUND
INPUT FREQUENCY (Hz)
1
–100
AMPLITUDE RESPONSE (dB)
–80
–60
–40
–20
10 100
1062 TA02
0
–90
–70
–50
0
FILTER OUTPUT NOISE (µV/√Hz)
20
40
10
30
50
–30
–10
C
OSC
= 3900pF
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
5th Order Lowpass Filter
2
LTC1062
1062fd
Total Supply Voltage (V
+
to V
–
) ............................... 18V
Input Voltage at Any Pin ..... V
–
– 0.3V ≤ V
IN
≤ V
+
+ 0.3V
Operating Temperature Range
LTC1062M (OBSOLETE)............. –55°C ≤ T
A
≤ 125°C
LTC1062C ................................... – 40°C ≤ T
A
≤ 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
(Note 1)
The
● denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. V
+
= 5V, V
–
= – 5V, unless otherwise specified. AC output measured at Pin 7,
Figure 1.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Current C
OSC
(Pin 5 to V
–
, Pin 11 in SW16) = 100pF 4.5 7 mA
● 10 mA
Input Frequency Range 0 to 20 kHz
Filter Gain at f
IN
= 0 f
CLK
= 100kHz, Pin 4 (Pin 6 in SW16) at V
+
, 0.00 dB
f
IN
= 0.5f
C
(Note 2) C = 0.01µF, R = 25.78k –0.02 –0.3 dB
f
IN
= f
C
● –2 –3.00 dB
f
IN
= 2f
C
● –28–30.00 dB
f
IN
= 4f
C
● –52–60.00 dB
Clock-to-Cutoff Frequency Ratio, f
CLK
/f
C
f
CLK
= 100kHz, Pin 4 (Pin 6 in SW16) at V
+
,100 ±1%
C = 0.01µF, R = 25.78k
Filter Gain at f
IN
= 16kHz f
CLK
= 400kHz, Pin 4 at V
+
, C = 0.01µF, R = 6.5k ● –43 –52 dB
f
CLK
/f
C
Tempco f
CLK
= 400kHz, Pin 4 at V
+
, C = 0.01µF, R = 6.5k 10 ppm/°C
Filter Output (Pin 7, Pin 13 in SW16) DC Swing Pin 7/Pin13 (SW16) Buffered with an External Op Amp ● ±3.5 ±3.8 V
Clock Feedthrough 1mV
P-P
PACKAGE/ORDER I FOR ATIO
UU
W
ORDER PART
NUMBER
LTC1062CN8
T
J MAX
= 100°C, θ
JA
= 130°C/W
T
J MAX
= 150°C, θ
JA
= 90°C/W
LTC1062CSW
ORDER PART
NUMBER
1
2
3
4
5
6
7
8
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO
16
15
14
13
12
11
10
9
NC
NC
FB
AGND
V–
NC
NC
NC
NC
B
OUT
OUT
V
+
C
OSC
NC
NC
DIVIDER
RATIO
1
2
3
4
8
7
6
5
TOP VIEW
FB
AGND
V
–
DIVIDER
RATIO
B
OUT
OUT
V
+
C
OSC
N8 PACKAGE
8-LEAD PDIP
J8 PACKAGE 8-LEAD CERDIP
T
J MAX
= 150°C, θ
JA
= 100°C/W
LTC1062MJ8
LTC1062CJ8
OBSOLETE PACKAGE
Consider the N8 Package as an Alternate Source
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
WWWU
3
LTC1062
1062fd
The ● denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25°C. V
+
= 5V, V
–
= – 5V, unless otherwise specified, AC output measured at Pin 7,
Figure 1.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Internal Buffer
Bias Current 250 pA
● 170 1000 pA
Offset Voltage 220 mV
Voltage Swing R
LOAD
= 20k ● ±3.5 ±3.8 V
Short-Circuit Current Source/Sink 40/3 mA
Clock (Note 3)
Internal Oscillator Frequency C
OSC
(Pin 5 to V
–
, Pin 11 in SW16) = 100pF 25 32 50 kHz
● 15 65 kHz
Max Clock Frequency 4 MHz
Pin 5 (Pin 11 in SW16) Source or Sink Current ● 40 80 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: f
C
is the frequency where the gain is –3dB with respect to the input
signal.
Note 3: The external or driven clock frequency is divided by either 1, 2 or 4
depending upon the voltage at Pin 4. For the N8 package, when Pin 4 = V
+
,
ratio = 1; when Pin 4 = GND, ratio = 2; when Pin 4 = V
–
, ratio = 4.
Amplitude Response Normalized
to the Cutoff Frequency
f
IN
/f
C
0.1
–100
RESPONSE (dB)
–80
–60
–40
–20
110
1062 G01
0
–90
–70
–50
–30
–10
1
2πRC
=
V
S
= ±2.5V
T
A
= 25°C
f
C
1.62
f
CLK
= 500kHz, f
C
= 5kHz
f
CLK
= 250kHz, f
C
= 2.5kHz
f
CLK
= 100kHz, f
C
= 1kHz
f
CLK
= 1kHz, f
C
= 10Hz
f
CLK
= 10kHz, f
C
= 100Hz
f
IN
/f
C
0.1
–100
RESPONSE (dB)
–80
–60
–40
–20
110
1062 G01
0
–90
–70
–50
–30
–10
1
2πRC
=
V
S
= ±2.5V
T
A
= 25°C
f
C
1.62
f
CLK
= 500kHz, f
C
= 5kHz
f
CLK
= 250kHz, f
C
= 2.5kHz
f
CLK
= 100kHz, f
C
= 1kHz
f
CLK
= 1kHz, f
C
= 10Hz
f
CLK
= 10kHz, f
C
= 100Hz
f
IN
/f
C
–1.0
–0.4
–0.6
–0.8
0.4
0.2
0
–0.2
1062 G03
PASSBAND GAIN (dB)
0.1 0.2 0.4 0.6 0.8
1
V
S
= ±5V
T
A
= 25°C
f
CLK
= 100kHz
1
2πRC
=
f
C
1.6
1
2πRC
=
f
C
1.62
1
2πRC
=
f
C
1.64
Amplitude Response Normalized
to the Cutoff Frequency
Passband Gain
vs Input Frequency
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
UW
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC1062CSW#PBF

Mfr. #:
Buy LTC1062CSW#PBF
Manufacturer:
Analog Devices Inc.
Description:
Active Filter Fifth Order Lowpass Filter
Lifecycle:
New from this manufacturer.
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