Linear Technology LTC1563-2, LTC1563-3 Datasheet
FEATURES
■
Extremely Easy to Use—A Single Resistor Value
Sets the Cutoff Frequency (2.56kHz < fC < 256kHz)
■
Extremely Flexible—Different Resistor Values
Allow Arbitrary Transfer Functions with or without
Gain (2.56kHz < fC < 256kHz)
■
LTC1563-2: Unity-Gain Butterworth Response Uses a
Single Resistor Value, Different Resistor Values
Allow Other Responses with or without Gain
■
LTC1563-3: Unity-Gain Bessel Response Uses a
Single Resistor Value, Different Resistor Values
Allow Other Responses with or without Gain
■
Rail-to-Rail Input and Output Voltages
■
Operates from a Single 3V (2.7V Min) to ±5V Supply
■
Low Noise: 36µV
fC = 256kHz
■
fC Accuracy < ±2% (Typ)
■
DC Offset < 1mV
■
Cascadable to Form 8th Order Lowpass Filters
■
Low Power Mode, fC < 25.6kHz, I
■
High Speed Mode, fC < 256kHz, I
■
Shutdown Mode, I
■
Continuous Time, Active RC Filter, No Clock
for fC = 25.6kHz, 60µV
RMS
SUPPLY
SUPPLY
= 1µA (Typ)
SUPPLY
for
RMS
=1mA (Typ)
= 10mA (Typ)
Final Electrical Specifications
LTC1563-2/LTC1563-3
Active RC, 4th Order
Lowpass Filter Family
U
DESCRIPTION
The LTC®1563-2/LTC1563-3 are a family of extremely
easy-to-use, active RC lowpass filters with rail-to-rail
inputs and outputs and low DC offset suitable for systems
with a resolution of up to 16 bits. The LTC1563-2, with a
single resistor value, gives a unity-gain Butterworth
response. The LTC1563-3, with a single resistor value,
gives a unity-gain Bessel response. The proprietary
architecture of these parts allows for a simple resistor
calculation:
R = 10k (256kHz/fC); fC = Cutoff Frequency
where fC is the desired cutoff frequency. For many applications, this formula is all that is needed to design a filter.
By simply utilizing different valued resistors, gain and
other responses are achieved.
The LTC1563-X features a low power mode, for the lower
frequency applications, where the supply current is reduced by an order of magnitude and a near zero power
shutdown mode.
The LTC1563-Xs are available in the narrow SSOP-16
package (SO-8 footprint).
January 2000
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APPLICATIONS
■
Replaces Discrete RC Active Filters and Modules
■
Antialiasing Filters
■
Smoothing or Reconstruction Filters
■
Linear Phase Filtering for Data Communication
■
Phase Locked Loops
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TYPICAL APPLICATION
Single 3.3V, 2.56kHz to 256kHz Butterworth Lowpass Filter
3.3V
V
0.1µF
R
R
R
IN
1µF
LTC1563-2
1
LP
2
SA
3
NC
4
INVA
5
NC
6
LPA
7
AGND
8
V
= 256kHz
f
C
–
16
+
V
15
LPB
14
NC
13
INVB
12
NC
11
SB
10
NC
9
EN
10k
()
R
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
R
R
1563 TA01
V
OUT
R
, LTC and LT are registered trademarks of Linear Technology Corporation.
Frequency Response
10
0
–10
–20
–30
–40
GAIN (dB)
–50
–60
–70
–80
R = 1M
f
C
10k1k
FREQUENCY (Hz)
= 2.56kHz
R = 10k
= 256kHz
f
C
100k 1M
1563 TA02
1
LTC1563-2/LTC1563-3
WW
W
ABSOLUTE MAXIMUM RA TIN GS
U
U
W
PACKAGE/ORDER INFORMATION
(Note 1)
Total Supply Voltage (V+ to V–)............................... 11V
Maximum Input Voltage at
Any Pin ....................... (V– – 0.3V) ≤ V
≤ (V+ + 0.3V)
PIN
Power Dissipation.............................................. 500mW
Operating Temperature Range
LTC1563C ...............................................0°C to 70°C
LTC1563I............................................ –40°C to 85°C
Storage Temperature Range................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
TOP VIEW
LP
1
2
SA
3
NC
4
INVA
5
NC
6
LPA
7
AGND
–
8
V
16-LEAD NARROW PLASTIC SSOP
NOTE: PINS LABELED NC ARE NOT CONNECTED
INTERNALLY AND SHOULD BE CONNECTED TO THE
SYSTEM GROUND
Consult factory for Military grade parts.
GN PACKAGE
T
= 150°C, θJA = 135°C/W
JMAX
+
16
V
15
LPB
14
NC
13
INVB
12
NC
11
SB
10
NC
9
EN
ORDER PART
NUMBER
LTC1563-2CGN
LTC1563-3CGN
LTC1563-2IGN
LTC1563-3IGN
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VS = Single 4.75V, EN pin to logic “low,” Gain = 1, R
speed (HS) and low power (LP) modes unless otherwise noted.
= R11 = R21 = R31 = R12 = R22 = R32, specifications apply to both the high
FIL
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PARAMETER CONDITIONS MIN TYP MAX UNITS
Specifications for Both LTC1563-2 and LTC1563-3
Total Supply Voltage (VS), HS Mode ● 311V
Total Supply Voltage (VS), LP Mode ● 2.7 11 V
Positive Output Voltage Swing (LPB Pin) VS = 3V, fC = 25.6kHz, R
HS Mode V
Negative Output Voltage Swing (LPB Pin) VS = 3V, fC = 25.6kHz, R
HS Mode V
Positive Output Swing (LPB Pin) VS = 2.7V, fC = 25.6kHz, R
LP Mode V
Negative Output Swing (LPB Pin) VS = 2.7V, fC = 25.6kHz, R
LP Mode V
DC Offset Voltage, HS Mode VS = 3V, fC = 25.6kHz, R
(Section A Only) V
DC Offset Voltage, LP Mode V
(Section A Only) V
DC Offset Voltage, HS Mode V
(Input to Output, Sections A, B Cascaded) V
DC Offset Voltage, LP Mode V
(Input to Output, Sections A, B Cascaded) V
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 2.7V, fC = 25.6kHz, R
S
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 3V, fC = 25.6kHz, R
S
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 2.7V, fC = 25.6kHz, R
S
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 100k, RL = 10k to GND ● 2.9 2.95 V
FIL
= 100k, RL = 10k to GND ● 4.55 4.7 V
FIL
= 100k, RL = 10k to GND ● 4.8 4.9 V
FIL
= 100k, RL = 10k to GND ● 0.015 0.05 V
FIL
= 100k, RL = 10k to GND ● 0.02 0.05 V
FIL
= 100k, RL = 10k to GND ● –4.95 –4.9 V
FIL
= 100k, RL = 10k to GND ● 2.6 2.65 V
FIL
= 100k, RL = 10k to GND ● 4.55 4.65 V
FIL
= 100k, RL = 10k to GND ● 4.8 4.9 V
FIL
= 100k, RL = 10k to GND ● 0.01 0.05 V
FIL
= 100k, RL = 10k to GND ● 0.015 0.05 V
FIL
= 100k, RL = 10k to GND ● –4.95 –4.9 V
FIL
= 100k ● ±1.5 ±3mV
FIL
= 100k ● ±1.0 ±3mV
FIL
= 100k ● ±1.5 ±3mV
FIL
= 100k ● ±2 ±4mV
FIL
= 100k ● ±2 ±4mV
FIL
= 100k ● ±2 ±5mV
FIL
= 100k ● ±1.5 ±3mV
FIL
= 100k ● ±1.0 ±3mV
FIL
= 100k ● ±1.5 ±3mV
FIL
= 100k ● ±2 ±5mV
FIL
= 100k ● ±2 ±5mV
FIL
= 100k ● ±2 ±6mV
FIL
2
LTC1563-2/LTC1563-3
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VS = Single 4.75V, EN pin to logic “low,” Gain = 1, R
speed (HS) and low power (LP) modes unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Offset Voltage Drift, HS Mode VS = 3V, fC = 25.6kHz, R
(Input to Output, Sections A, B) V
DC Offset Voltage Drift, LP Mode V
(Input to Output, Sections A, B) V
AGND Voltage VS = 4.75V, fC = 25.6kHz, R
Power Supply Current, HS Mode VS = 3V, fC = 25.6kHz, R
Power Supply Current, LP Mode VS = 2.7V, fC = 25.6kHz, R
Shutdown Mode Supply Current VS = 4.75V, fC = 25.6kHz, R
EN Input V
Logic Low Level V
EN Input V
Logic High Level V
LP VS = 3V ● 0.8 V
Logic Low Level V
LP VS = 3V ● 2.5 V
Logic High Level V
LTC1563-2 Transfer Function Characteristics
Cutoff Frequency Range, f
C
HS Mode V
Cutoff Frequency Range, f
C
LP Mode V
Cutoff Frequency Accuracy, HS Mode V
= 25.6kHz VS = 4.75V, R
f
C
Cutoff Frequency Accuracy, HS Mode V
= 256kHz VS = 4.75V, R
f
C
Cutoff Frequency Accuracy, LP Mode VS = 2.7V, R
= 25.6kHz VS = 4.75V, R
f
C
Cutoff Frequency Temperature Coefficient ● ±1 ppm/°C
Passband Gain, HS Mode, fC = 25.6kHz Test Frequency = 2.56kHz (0.1 • fC) ● –0.2 0 0.2 dB
VS = 4.75V, R
= 100k Test Frequency = 12.8kHz (0.5 • fC) ● –0.3 0 0.3 dB
FIL
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 2.7V, fC = 25.6kHz, R
S
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
V
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
V
= 4.75V, fC = 25.6kHz, R
S
VS = ±5V, fC = 25.6kHz, R
= 3V ● 0.8 V
S
= 4.75V ● 1V
S
VS = ±5V ● 1V
= 3V ● 2.5 V
S
= 4.75V ● 4.3 V
S
VS = ±5V ● 4.4 V
= 4.75V ● 1V
S
VS = ±5V ● 1V
= 4.75V ● 4.3 V
S
VS = ±5V ● 4.4 V
VS = 3V ● 5 256 kHz
= 4.75V ● 5 256 kHz
S
VS = ±5V ● 5 256 kHz
VS = 2.7V ● 5 25.6 kHz
= 4.75V ● 5 25.6 kHz
S
VS = ±5V ● 5 25.6 kHz
= 3V, R
S
VS = ±5V, R
= 3V, R
S
VS = ±5V, R
VS = ±5V, R
= R11 = R21 = R31 = R12 = R22 = R32, specifications apply to both the high
FIL
= 100k ● 5 µV/°C
FIL
= 100k ● 5 µV/°C
FIL
= 100k ● 5 µV/°C
FIL
= 100k ● 5 µV/°C
FIL
= 100k ● 5 µV/°C
FIL
= 100k ● 5 µV/°C
FIL
= 100k ● 2.35 2.375 2.40 V
FIL
= 100k ● 8.0 14 mA
FIL
= 100k ● 10.5 17 mA
FIL
= 100k ● 15 23 mA
FIL
= 100k ● 1.0 1.8 mA
FIL
= 100k ● 1.4 2.5 mA
FIL
= 100k ● 2.3 3.5 mA
FIL
= 100k ● 120 µA
FIL
= 100k ● –1.5 ±1.5 3.5 %
FIL
= 100k ● –1.5 ±1.5 3.5 %
FIL
= 100k ● –1.5 ±1.5 3.5 %
FIL
= 10k ● –5 ±1.5 1.5 %
FIL
= 10k ● –5 ±1.5 1.5 %
FIL
= 10k ● –5 ±1.5 1.5 %
FIL
= 100k ● –3 ±1.5 3 %
FIL
= 100k ● –3 ±1.5 3 %
FIL
= 100k ● –3 ±1.5 3 %
FIL
3
LTC1563-2/LTC1563-3
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VS = Single 4.75V, EN pin to logic “low,” Gain = 1, R
speed (HS) and low power (LP) modes unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Stopband Gain, HS Mode, f
VS = 4.75V, R
= 100k Test Frequency = 102.4kHz (4 • fC) ● –48 –46 dB
FIL
Passband Gain, HS Mode, fC = 256kHz Test Frequency = 25.6kHz (0.1 • fC) ● –0.2 0 0.2 dB
VS = 4.75V, R
= 10k Test Frequency = 128kHz (0.5 • fC) ● –0.5 0 0.5 dB
FIL
Stopband Gain, HS Mode, f
VS = 4.75V, R
= 10k Test Frequency = 500kHz (1.95 • fC) ● –23.3 –21.5 dB
FIL
Passband Gain, LP Mode, f
VS = 4.75V, R
= 100k Test Frequency = 12.8kHz (0.5 • fC) ● –0.6 –0.02 0.6 dB
FIL
Stopband Gain, LP Mode, f
VS = 4.75V, R
= 100k Test Frequency = 102.4kHz (4 • fC) ● –48 –46.5 dB
FIL
LTC1563-3 Transfer Function Characteristics
Cutoff Frequency Range, f
HS Mode VS = 4.75V ● 5 256 kHz
Cutoff Frequency Range, f
LP Mode V
Cutoff Frequency Accuracy, HS Mode V
= 25.6kHz VS = 4.75V, R
f
C
Cutoff Frequency Accuracy, HS Mode V
= 256kHz VS = 4.75V, R
f
C
Cutoff Frequency Accuracy, LP Mode V
= 25.6kHz VS = 4.75V, R
f
C
Cutoff Frequency Temperature Coefficient ● ±1 ppm/°C
Passband Gain, HS Mode, fC = 25.6kHz Test Frequency = 2.56kHz (0.1 • fC) ● –0.2 –0.03 0.2 dB
VS = 4.75V, R
= 100k Test Frequency = 12.8kHz (0.5 • fC) ● –1.0 –0.72 –0.25 dB
FIL
Stopband Gain, HS Mode, f
VS = 4.75V, R
= 100k Test Frequency = 102.4kHz (4 • fC) ● –34.7 –31 dB
FIL
Passband Gain, HS Mode, f
VS = 4.75V, R
= 10k Test Frequency = 128kHz (0.5 • fC) ● –1.1 –0.72 –0.5 dB
FIL
Stopband Gain, HS Mode, f
VS = 4.75V, R
= 10k Test Frequency = 500kHz (1.95 • fC) ● –13 –10.5 dB
FIL
Passband Gain, LP Mode, f
VS = 4.75V, R
= 100k Test Frequency = 12.8kHz (0.5 • fC) ● –1.0 –0.72 –0.25 dB
FIL
Stopband Gain, LP Mode, f
VS = 4.75V, R
= 100k Test Frequency = 102.4Hz (4 • fC) ● –34.7 –32 dB
FIL
Note 1: Absolute Maximum Ratings are those value beyond which the life
of a device may be impaired.
= 25.6kHz Test Frequency = 51.2kHz (2 • fC) ● –24 –21.5 d B
C
= 256kHz Test Frequency = 400kHz (1.56 • fC) ● –15.7 –13.5 dB
C
= 25.6kHz Test Frequency = 2.56kHz (0.1 • fC) ● –0.25 0 0.25 dB
C
= 25.6kHz Test Frequency = 51.2kHz (2 • fC) ● –24 –22 dB
C
C
VS = 3V ● 5 256 kHz
VS = ±5V ● 5 256 kHz
C
VS = 2.7V ● 5 25.6 kHz
= 4.75V ● 5 25.6 kHz
S
VS = ±5V ● 5 25.6 kHz
= 3V, R
S
VS = ±5V, R
= 3V, R
S
VS = ±5V, R
= 2.7V, R
S
VS = ±5V, R
= 25.6kHz Test Frequency = 51.2kHz (2 • fC) ● –13.6 –10 dB
C
= 256kHz Test Frequency = 25.6kHz (0.1 • fC) ● –0.2 –0.03 0.2 dB
C
= 256kHz Test Frequency = 400kHz (1.56 • fC) ● –8.3 –6 dB
C
= 25.6kHz Test Frequency = 2.56kHz (0.1 • fC) ● –0.2 –0.03 0.2 dB
C
= 25.6kHz Test Frequency = 51.2kHz (2 • fC) ● –13.6 –11 dB
C
= R11 = R21 = R31 = R12 = R22 = R32, specifications apply to both the high
FIL
= 100k ● –2 ±2 5.5 %
FIL
= 100k ● –2 ±2 5.5 %
FIL
= 100k ● –2 ±2 5.5 %
FIL
= 10k ● –2 ±26 %
FIL
= 10 ● –2 ±26 %
FIL
= 10k ● –2 ±26 %
FIL
= 100k ● –3 ±37 %
FIL
= 100k ● –3 ±37 %
FIL
= 100k ● –3 ±37 %
FIL
4
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