LINER LTC1164-8

LTC1164-8
Ultraselective, Low Power
8th Order Elliptic Bandpass Filter
with Adjustable Gain
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DESCRIPTION
FEATURES
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The LTC®1164-8 is a monolithic ultraselective, 8th order,
elliptic bandpass filter. The passband of the LTC1164-8 is
tuned with an external clock and the clock-to-center frequency ratio is 100:1. The – 3dB pass bandwidth is typically 1% of the filter center frequency. The stopband
attenuation of the LTC1164-8 is greater than 50dB. The
lower and upper stopband frequencies are less than
0.96 • center frequency and greater than 1.04 • center
frequency, respectively.
Ultraselectivity
(50dB Attenuation at ±4% of Center Frequency)
Adjustable Passband Gain
Noise Independent of Gain
Filter Noise: 270µVRMS, VS = Single 5V Supply
Clock-Tunable (Center Frequency = fCLK /100)
Center Frequencies up to 5kHz, VS = ±5V
(Typical ISUPPLY = 3.2mA)
Center Frequencies up to 4kHz, VS = Single 5V Supply
(Typical ISUPPLY = 2.3mA)
The LTC1164-8 requires an external op amp and two
external resistors (see the circuit below). The filter’s gain
at center frequency is set by the ratio RIN /RF. For a gain
equal to one and an optimum dynamic range, RF should be
set to 61.9k and RIN should be 340k. For gains other than
one, RIN = 340k/Gain. Gains up to 1000 are obtainable.
Setting the filter’s gain with input resistor RIN does not
increase the filter’s wideband noise. The 270µVRMS
wideband noise of the LTC1164-8 is independent of the
filter’s center frequency.
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APPLICATIONS
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Asynchronous Narrowband Signal Detectors
Low Frequency Asynchronous Demodulators
Handheld Spectrum Analyzers
In-Band Tone Signaling Detectors
The LTC1164-8 is available in a 14-pin PDIP or a 16-pin
surface mount SO Wide package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Frequency Response
Ultranarrow 1kHz Bandpass Filter with Gain = 10
Gain = 340k/R IN, 1/(2π • RF • CF) ≥ 10 • Center Frequency
VIN
5V
1
14
2
13
3
12
4
LTC1164-8
11
5
10
6
9
7
8
20
CF
200pF
10
0
RF
61.9k
–5V
GAIN (dB)
RIN
34k
30
100kHz
5V
2
7
LT ®1006
3
SHORT CONNECTION UNDER IC AND
SHIELDED BY A GROUND PLANE
–
+
6
–20
–30
–40
VOUT
4
–5V
50dB
–10
–50
–60
LTC1164-8 • TA01
–70
0.90
0.95
1.05
1.00
FREQUENCY (kHz)
1.10
1.15
1164-8 TA02
1
LTC1164-8
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ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V –)........................... 16.5V
Power Dissipation............................................. 700mW
Burn-In Voltage ................................................... 16.5V
Voltage at Any Input .... (V – – 0.3V) ≤ VIN ≤ (V + + 0.3V)
Operating Temperature Range* .................. 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Maximum Clock Frequency
VS = ±7.5V .................................................... 720kHz
VS = ±5V ....................................................... 540kHz
VS = Single 5V ............................................... 430kHz
*For an extended operating temperature range contact LTC Marketing for
details.
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PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
NC
1
INVB
2
13 NC
AGND
3
12 V –
V+
4
11 fCLK
AGND
5
NC
6
9
IOUT
INVA
7
8
NC
14 R(h, l)
LTC1164-8CN
10 NC
ORDER PART
NUMBER
TOP VIEW
NC
1
16 R(h, l)
INVB
2
15 NC
AGND
3
14 V –
V+
4
13 NC
AGND
5
12 fCLK
NC
6
11 NC
NC
7
10 NC
INVA
8
9
N PACKAGE
14-LEAD PDIP
LTC1164-8CSW
IOUT
SW PACKAGE
16-LEAD PLASTIC SO WIDE
TJMAX = 110°C, θJA = 65°C/ W
TJMAX = 110°C, θJA = 85°C/ W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
(See Test Circuit)
TA = 25°C, Center Frequency = fCLK /100, fCLK = 100kHz (the clock signal is a TTL or CMOS square wave, clock rise or fall time ≤ 1µs),
the AC test signal level is 1VRMS for VS = ±5V or 0.5VRMS for VS = ±2.375V, unless otherwise specified.
PARAMETER
Gain at Center Frequency
CONDITIONS
VS = ±2.375V
fIN = 1000Hz
●
VS = ±5V
fIN = 1000Hz
Gain at 0.995 • Center Frequency and
1.005 • Center Frequency
(Referenced to Gain at Center Frequency)
VS = ±2.375V
Lower Stopband Attenuation
(Referenced to Gain at Center Frequency)
VS = ±2.375V
fIN = 995Hz
fIN = 1005Hz
fIN = 995Hz
fIN = 1005Hz
fIN = 960Hz (Note 1)
fIN = 800Hz
●
VS = ±5V
●
●
●
VS = ±5V
2
fIN = 960Hz (Note 1)
fIN = 800Hz
MIN
TYP
–3
–4
–3
–4
–9
–9
0 ± 1.5
0 ± 2.0
0 ± 1.5
0 ± 2.0
– 48
– 50
– 48
– 48
– 3 ±2
– 3 ±2
– 52
– 52
– 52
– 52
MAX
3
4
3
4
3
3
– 58
– 60
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
LTC1164-8
ELECTRICAL CHARACTERISTICS
(See Test Circuit)
TA = 25°C, Center Frequency = fCLK /100, fCLK = 100kHz ( the clock signal is a TTL or CMOS square wave, clock rise or fall time ≤ 1µs),
the AC test signal level is 1VRMS for VS = ±5V or 0.5VRMS for VS = ±2.375V, unless otherwise specified.
PARAMETER
Upper Stopband Attenuation
(Referenced to Gain at Center Frequency)
VS = ±2.375V
CONDITIONS
MIN
TYP
fIN = 1040Hz (Note 1)
– 48
– 52
– 50
– 48
– 52
– 48
– 52
– 52
dB
dB
1.0
2.5
VRMS
VRMS
fIN = 1200Hz
●
VS = ±5V
fIN = 1040Hz (Note 1)
fIN = 1200Hz
Maximum Output for < 0.25%
Total Harmonic Distortion
VS = ±2.5V
VS = ±5V
fIN = 1000Hz
fIN = 1000Hz
Output DC Offset
VS = ±2.5V (At the Output of External Op Amp)
VS = ±5V
Power Supply Current (Note 2)
VS = ±2.375V
UNITS
dB
– 58
– 60
dB
dB
– 40 ±50
– 50 ±60
VS = ±5V
4.0
4.5
mA
mA
3.2
7.0
8.0
mA
mA
4.5
11.0
12.5
mA
mA
±8
V
●
VS = ±7.5V
●
±2.375
Power Supply Range
mV
mV
2.3
●
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: The minimum stopband attenuation at 960Hz and 1040Hz is
guaranteed by design and test correlation.
MAX
Note 2: The maximum current over temperature is at 0°C. At 70°C the
maximum current is less than its maximum value at 25°C.
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TYPICAL PERFORMANCE CHARACTERISTICS
Passband Variations
vs Power Supply
Gain vs Frequency
10
6
3
fCLK = 100kHz
GAIN = 1
0 R = 340k
IN
RF = 61.9k
–3
–20
GAIN (dB)
–40
–50
–60
0
VS = ±5V
–6
VS = ±7.5V
–9
–12
–70
–15
–80
–90
760
880
1120
1000
FREQUENCY (Hz)
1240
–18
990
1000
1005
1010
LTC1164-8 • TPC02
180
120
60
–3
0
–6
–60
–9
–120
–12
–180
–15
–240
–18
–300
–21
–360
–24
995
FREQUENCY (Hz)
LTC1164-8 • TPC01
TA = 25°C
VS = ±5V
fCLK = 100kHz
3
984
992
1008
1000
FREQUENCY (Hz)
1016
PHASE (DEG)
–30
VS = ±2.5V
GAIN (dB)
TA = 25°C
0 VS = ±5V
= 100kHz
f
–10 CLK
GAIN (dB)
Passband Gain and Phase
vs Frequency
–420
LTC1164-8 • TPC03
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LTC1164-8
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TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain and Delay
vs Frequency
THD + Noise vs Input Voltage
90
–26
80
–3
70
–6
60
–9
50
–32
–38
–56
–15
30
–18
20
–21
10
–74
0
–80
0.01
992
1008
1000
FREQUENCY (Hz)
1016
–62
–68
0.1
1
INPUT VOLTAGE (VRMS)
–80
1.5
2.0
2.5
INPUT VOLTAGE (VP-P)
3.0
3.5
LTC1164-8 • TPC07
4
AGND = 2.5V
AGND = 2V
–62
–68
0.1
INPUT VOLTAGE (VRMS)
1
2
LTC1164-8 • TPC06
Output vs Input
10
0
25°C
4.0
70°C
3.0
2.0
OUTPUT LEVEL (dBV)
POWER SUPPLY CURRENT (mA)
20 LOG (THD + NOISE/VIN) (dB)
AGND AT 2V
1.0
–50
–56
–80
0.01
5
5.0
AGND AT 2.5V
0.5
–44
Power Supply Current
vs Power Supply Voltage
–40
–70
–38
LTC1164-8 • TPC05
THD + Noise vs Input Voltage
–60
–32
–74
LTC1164-8 • TPC04
TA = 25°C
VS = SINGLE 5V
fIN = 1kHz
–50 fCLK = 100kHz
FILTER GAIN AT fCENTER = 1
OUTPUT OP AMP IS LT1006
TA = 25°C
VS = SINGLE 5V
fIN = 1kHz
fCLK = 100kHz
FILTER GAIN AT fCENTER = 1
OUTPUT OP AMP IS LT1006
–26
–50
40
984
TA = 25°C
VS = ±5V
fIN = 1kHz
fCLK = 100kHz
FILTER GAIN AT fCENTER = 1
OUTPUT OP AMP IS LT1006
–44
–12
–24
THD + Noise vs Input Voltage
–20
20 LOG (THD + NOISE/VIN) (dB)
–20
DELAY (ms)
GAIN (dB)
TA = 25°C
3 VS = ±5V
= 100kHz
f
0 CLK
100
20 LOG (THD + NOISE/VIN) (dB)
6
fCLK = 100kHz
fCENTER = 1kHz
fIN = 1kHz
–10
–20
VS = SINGLE 5V
(PINS 3, 5 AT 2V)
–30
–40
1.0
VS = ± 5V
–50
0
0
0.8 1.6 2.4 3.2 4.0 4.8 5.6 6.4 7.2 8.0
POWER SUPPLY VOLTAGE (V + OR V –)
LTC1164-8 • TPC08
–60
–60 –50
–40 –30 –20 –10
INPUT LEVEL (dBV)
0
10
LTC1164-8 • TPC09
LTC1164-8
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PIN FUNCTIONS
(14-Lead PDIP)
V +, V – (Pins 4, 12): Power Supply Pins. The V + (Pin 4)
and the V – (Pin 12) should be bypassed with a 0.1µF
capacitor to a reliable ground plane. The filter’s power
supplies should be isolated from other digital or high
voltage analog supplies. A low noise linear supply is
recommended. Using a switching power supply will
lower the signal-to-noise ratio of the filter. The power
supply during power-up should have a slew rate of less
than 1V/µs.
power supply for the clock source should not be the filter’s
power supply. The analog ground for the filter should be
connected to the clock’s ground at a single point only.
Table 1 shows the clock’s low and high level threshold
values for dual or single supply operation. A pulse generator can be used as a clock source provided the high level
on-time is at least 1µs. Sine waves are not recommended
for clock input frequencies less than 100kHz. The clock’s
rise or fall time should be equal to or less than 1µs.
For dual supply operation if the V + supply is applied before
the V – supply or the V – supply is applied before the V +
supply, a signal diode on each supply pin to ground will
prevent latchup. Figures 1 and 2 show typical connections
for dual and single supply operation.
Table 1. Clock Source High and Low Threshold Levels
POWER SUPPLY
fCLK (Pin 11): Clock Input Pin. Any TTL or CMOS clock
source with a square wave output and 50% duty cycle
(±10%) is an adequate clock source for the device. The
RIN
340k
VIN
1
14
2
13
3
4
5V
*1N4148
OR EQUIVALENT
0.1µF
>1.45V
<0.5V
Single Supply = 12V
>7.80V
<6.5V
Dual Supply = ±2.5V
>0.73V
<– 2.0V
Dual Supply = ±5V
>1.45V
<0.5V
Dual Supply = ±7.5V
>2.18V
<0.5V
RF
61.9k
11
5
10
6
9
7
8
LOW LEVEL
Single Supply = 5V
12
LTC1164-8
HIGH LEVEL
fCLK
0.1µF
5V
–5V
1N4148*
OR EQUIVALENT
0.1µF
–
2
7
6
*FOR SURFACE MOUNT CIRCUITS
USE MOTOROLA DIODE MBR0530
OR EQUIVALENT
VOUT
+
3
LTC1164-8 • F01
4
0.1µF
–5V
Figure 1. Dual Power Supply Operation (Gain = 1)
RIN
340k
VIN
14
2
13
3
12
4
5V
0.1µF
15k
+
1µF
1
10k
LTC1164-8
11
5
10
6
9
7
8
RF
61.9k
5V
fCLK
0.1µF
2
–
3
+
7
6
VOUT
4
LTC1164-8 • F02
Figure 2. Single Power Supply Operation (Gain = 1)
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LTC1164-8
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PIN FUNCTIONS
AGND (Pins 3, 5): Analog Ground Pins. For dual supply
operation, Pins 3 and 5 (AGND) are connected to an
analog ground plane. For single supply operation, Pins 3
and 5 should be biased at 1/2 of the V + supply and be
bypassed to the analog ground plane with a 1µF (tantalum or better) capacitor (Figure 2). For optimum gain
linearity and single 5V supply operation, the analog
ground Pins 3 and 5 should be biased at 2V. Under these
conditions the typical output AC swing is 0.5V to 3.5V
(please refer to the THD + Noise vs Input Voltage graph).
The filter performance depends on the quality of the
analog ground. For either a dual or a single supply
operation, an analog ground plane surrounding the package is necessary. The analog ground plane for the filter
should be connected to any digital ground plane at a
single point.
INVB, INVA, IOUT, [R (h, l]) (Pins 2, 7, 9, 14): External
Connection Pins. Pin 2 (INVB) is the inverting input on an
op amp. Pin 9 (IOUT) is the junction of two internal
resistors. Pin 7 (INVA) is the inverting input of an op amp,
Pin 14 [R (h, l)] is the junction of two internal resistors.
For normal filter operation an external input resistor (RIN)
should be connected to input Pin 2 and the output Pin 9
should be connected to the inverting input of an external
op amp with a feedback resistor (RF). Also Pins 7 and 14
should be connected together (Figures 1 and 2). On a
printed circuit board the external connections should be
less than one inch and surrounded by a ground plane.
The input resistor and output op amp with feedback
resistor determine the filter’s gain and dynamic range.
Please refer to the Applications Information section for
more information.
NC (1, 6, 8, 10, 13): NC Pins. Pins 1, 6, 8, 10 and 13 are
not connected to any circuit point on the device and
should be tied to analog ground for dual or single supply
operation.
TEST CIRCUIT
100pF
RIN
340k
VIN
14
2
13
3
12
4
VS
1N4148
1
0.1µF
LTC1164-8
61.9k
–VS
11
5
10
6
9
7
8
0.1µF
15V
1N4148
2
–
3
+
0.1µF
7
LT1220
6
VOUT
4
fCLK
100kHz
–15V
0.1µF
LTC1164-8 • TC
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LTC1164-8
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APPLICATIONS INFORMATION
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Passband Gain and Dynamic Range
VS = ±5V
RIN = 340k
0 R = 61.9k
F
The filter’s gain at fCENTER is set with an external op amp
and resistors RIN and RF (Figure 1). The filter’s center
frequency (fCENTER) is equal to the clock frequency divided
by 100. The output dynamic range of LTC1164-8 is optimized for minimum noise and maximum voltage swing
when resistor RF is 61.9k. The value of resistor RIN
depends on the filter’s gain and it is calculated by the
equation RIN = 340k/Gain. Table 2 lists the values of RIN
and RF for some typical gains. Increasing the filter’s gain
with resistor RIN does not increase the noise generated by
the filter. Table 3 shows the noise generated by the filter
with its input grounded.
Table 2. Passband Gain at Center Frequency, RIN and RF
GAIN
RIN (±1%)
RF (±1%)
1
340k
61.9k
GAIN IN dB RIN (±1%)
0
340k
RF (±1%)
61.9k
GAIN (dB)
–3
–6
–9
–12
–15
–18
–0.50
fCENTER
1.00
0.50
–1.00
PERCENT DEVIATION FROM fCENTER (±% fCENTER)
LTC1164-8 • F03
Figure 3. Typical Passband Variations
the filter, only a small amount of input noise will reach the
filter’s output. If the output noise of the LTC1164-8 is
neglected, the signal-to-noise ratio at the output of the
filter divided by the signal-to-noise ratio at the input of the
filter equals:
2
169k
61.9k
10
107k
61.9k
5
68.1k
61.9k
15
60.4k
61.9k
10
34k
61.9k
20
34k
61.9k
20
16.9k
61.9k
25
19.1k
61.9k
50
6.81k
61.9k
30
10.7k
61.9k
where,
100
3.4k
61.9k
35
6.01k
61.9k
200
1.69k
61.9k
40
3.4k
61.9k
500
680Ω
61.9k
45
1.91k
61.9k
(BW)IN = noise bandwidth at the input of the filter
(BW)f = 0.01 • fCENTER = noise equivalent filter bandwidth
1000
340Ω
61.9k
50
1.07k
61.9k
Table 3. LTC1164-8 Noise with Its Input Grounded
POWER SUPPLY
NOISE (µVRMS)
±5V
Single 5V
360 ±10%
270 ±10%
The passband of the LTC1164-8 is from 0.995 • fCENTER to
1.005 • fCENTER. At the passband’s end points the typical
filter gain is – 3dB ±2dB relative to the gain at fCENTER.
Figure 3 shows typical passband gain variations versus
percent of frequency deviation from fCENTER. Outside the
filter’s passband, signal attenuation increases to – 50dB
for frequencies less than 0.96 • fCENTER and greater than
1.04 • fCENTER.
In applications where a signal is to be detected in the
presence of wideband noise, the ultraselectivity of the
LTC1164-8 can improve the output signal-to-noise ratio.
When wideband noise (white noise) appears at the input to
(S/N)OUT/(S/N)IN = 20 • Log √(BW)IN/(BW)f
Example: A small 1kHz signal is sent through a cable that
also conducts random noise. The cable bandwidth is
3.4kHz. An LTC1164-8 is used to detect the 1kHz signal.
The signal-to-noise ratio at the output of the filter is 25.3dB
larger than the signal-to-noise ratio at the input of the filter
(20 • Log√(BW)IN/(BW)f = 20 • Log√3.4kHz/ 0.01 • 1kHz
1kHz = 25.3dB).
The AC output swing with ±5V supplies is ±4V, with a
single 5V supply it is 1V to 4V, when AGND (Pins 3, 5) is
biased at 2.5V. Table 4 lists op amps that are recommended for use with an LTC1164-8. The LTC1164-8 is
designed and specified for a dual ±5V or single 5V supply
operation. The filter’s passband gain linearity is optimum
at single 5V supply and with Pins 3, 5 (AGND) biased at 2V.
Filter operation at ±7.5V supplies is not tested or specified. At VS = 7.5V, the filter will operate with center
frequencies up to 7kHz. Please refer to the Passband
Variations vs Power Supply graph in the Typical Performance Characteristics.
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LTC1164-8
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APPLICATIONS INFORMATION
Table 4. Recommended Op Amps for LTC1164-8
Clock Feedthrough
DUAL
QUAD
LT1006
LT1012
LT1077
LT1013
LT1078
LT1112
LT1413
LT1014
LT1079
LT1114
A
10mV/DIV
SINGLE
B
Aliasing
At the filter’s output, alias signals will appear when
signals at the filter’s input have substantial energy very
near the clock frequency or any of its multiples (2 • fCLK,
3 • fCLK, ... etc.). For example, if an LTC1164-8 filter
operates with a 100kHz clock and has a 99kHz, 10mV
signal at its input, a 1kHz, 10mV alias signal will appear
at the filter’s output. Table 5 shows details.
Table 5. Aliasing (fCLK = 100kHz)
5µs/DIV
LTC1164-8 • F04
Figure 4. Clock Feedthrough at the Output of External Op Amp
A. With No Capacitor Across Feedback Resistor RF
B. With Capacitor CF Across Feedback Resistor RF
1/(2π • RF • CF) = 10 • fCENTER
OUTPUT FREQUENCY
(ALIAS FREQUENCY)
99.04kHz
(or 100.96kHz)
< – 50dB
960Hz
99.02kHz
(or 100.98kHz)
< – 40dB
980Hz
99.01kHz
(or 100.99kHz)
< – 6dB
990Hz
99.005kHz
(or 100.995Hz)
– 3dB ±2dB
995Hz
99.00kHz
(or 101.00kHz)
0dB ±1dB
1000Hz
98.995kHz
(or 101.005kHz)
– 3dB ±2dB
1005Hz
98.99kHz
(or 101.01kHz)
< – 6dB
1010Hz
98.98kHz
(or 101.02kHz)
< – 40dB
1020Hz
98.96kHz
(or 101.04kHz)
< – 50dB
1040Hz
1V/DIV FOR INPUT
20mV/DIV FOR OUTPUT
Transient Response
OUTPUT LEVEL
(RELATIVE TO INPUT)
OUTPUT
INPUT
VS = ±5V
fCLK = 500kHz
fCENTER = 5kHz
5ms/DIV
LTC1164-8 • F05
Figure 5. Square Wave Input (±2.5V)
OUTPUT
2V/DIV
INPUT FREQUENCY
LT1006
VS = ±5V
fCLK = 100kHz
INPUT
VS = ±5V
fCLK = 100kHz
fCENTER = 1kHz
50ms/DIV
Figure 6. Sine Wave Burst Input
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LTC1164-8 • F06
LTC1164-8
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APPLICATIONS INFORMATION
Printed Circuit Layout
For optimum filter performance, an LTC1164-8 should be
operating on a printed circuit board that has been laid out
for precision analog signal processing circuits. On a
printed circuit board, an LTC1164-8 should be surrounded
with an adequate analog signal ground plane and its power
supply pins bypassed to ground with 0.1µF capacitors.
The ground plane of an LTC1164-8 and any digital ground
plane should preferably meet at a single point on a system
ground (star system ground).
The following external filter connections should be one
inch or less:
N Package
Resistor RIN to Pin 2
Pin 14 to Pin 7
Pin 9 to the Inverting Node of an External Op Amp
Ground Pins 1, 3, 5, 6, 8, 10 and 13
SW Package
Resistor RIN to Pin 2
Pin 16 to Pin 8
Pin 9 to the Inverting Node of External Op Amp
Ground Pins 1, 3, 5, 6, 7, 10, 11, 13 and 15
Any signal or power supply printed circuit traces should
be at least 0.2 inches away from the above mentioned
connections (this rule applies also to the routing of the
printed circuit trace originating from a clock source in a
digital circuit and terminating at a clock input pin of an
LTC1164-8). Operating an LTC1164-8 in an IC socket is
not recommended.
U
TYPICAL APPLICATIONS N
Tone Detector and Average Value Circuit
RIN
340k
VIN
14
2
13
3
12
4
5V
1N4148
1
0.1µF
LTC1164-8
CF
5
10
6
9
7
8
RF
61.9k
–5V
11
0.1µF
1N4148
–
C1
R1
10k
1/2 LT1413
+
5k
1N458
5k
1N458
A
B
–
1/2 LT1413
+
fCLK
100kHz
5k
5V
–
5k
R2
100k
5k
0.1µF
4
5k
–
R3
100k
+
1/2 LT1413
+
A
C2
11
–5V
0.1µF
1/2 LT1413
B
VOUT = AVERAGE OF ABS [VPEAK × SIN (2π × fCENTER × t)], ±10% FROM 1VP-P TO 7VP-P
RIN = 340k/GAIN; fCENTER = fCLK/100; 1/(2π × RF × CF) ≥ 10 × fCENTER
1/(2π × R1 × C1) ≤ fCENTER/10; 1/(2π × R2 × C2) ≤ fCENTER/25; R2 × C2 = R3 × C3
VOUT
C3
LTC1164-8 • TA03
9
LTC1164-8
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
14
13
12
11
10
9
8
1
2
3
4
5
6
7
0.255 ± 0.015*
(6.477 ± 0.381)
0.130 ± 0.005
(3.302 ± 0.127)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
0.015
(0.380)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.325 –0.015
(
8.255
+0.635
–0.381
)
0.125
(3.175)
MIN
0.075 ± 0.015
(1.905 ± 0.381)
0.100 ± 0.010
(2.540 ± 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm).
10
0.018 ± 0.003
(0.457 ± 0.076)
N14 0694
LTC1164-8
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
SW Package
16-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.398 – 0.413
(10.109 – 10.490)
(NOTE 2)
16
15
14
13
12
11
10
9
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
0.005
(0.127)
RAD MIN
1
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.010 – 0.029 × 45°
(0.254 – 0.737)
2
3
4
5
6
7
8
0.093 – 0.104
(2.362 – 2.642)
0.037 – 0.045
(0.940 – 1.143)
0° – 8° TYP
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
TYP
0.004 – 0.012
(0.102 – 0.305)
0.014 – 0.019
(0.356 – 0.482)
TYP
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.
2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
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.
SOL16 0392
11
LTC1164-8
U
TYPICAL APPLICATION
Tone Detector — Detecting a Low Level Signal Buried in Wideband Noise
fCLK
RIN
VIN
1
14
2
13
3
12
4
5V
5
0.1µF
+
1µF
LTC1164-8
5V
CF
R2
10k
RF
61.9k
11
5V
18
10
6
9
7
8
1
–
C1
1/2 LT1413
+
5V
4
R1
10k
0.1µF
–
8
1/2 LT1413
+
30.1k
AGND (2V)
0.1µF
0.1µF
0.1µF
1k
REF1 (1.9V)
8.87k
REF2 (1V)
10k
0.1µF
FOR OPTIMUM TONE DETECTION, THE SIGNAL’S FREQUENCY SHOULD BE IN THE
FILTER’S PASSBAND AND WITHIN ±0.1% FROM fCENTER.
AT VOUT, LOGIC HIGH = SIGNAL AT VIN, LOGIC LOW = NO SIGNAL AT VIN.
THE MINIMUM DETECTABLE SIGNAL AT VIN: VIN(MIN) = 200mVRMS/GAIN.
THE MAXIMUM NOISE SPECTRAL DENSITY AT VIN: VIN = 32mVRMS/[GAIN • √(BW)f]
WHERE:(BW) f = 0.01 • fCENTER AND IS THE NOISE EQUIVALENT BANDWIDTH
OF THE FILTER
GAIN = 340k/R IN AND IS THE FILTER GAIN AT fCENTER
RIN = 340k/GAIN; fCENTER = fCLK/100; 1/(2π • RF • CF) ≥ 10 • fCENTER
1/(2π • R1 • C1) ≤ fCENTER/10; 1/(2π • R3 • C2) ≤ fCENTER/32
R3
10k
STROBE
LTC1040
5
6
7
8
+
–
+ COMP1
–
4
14
REF2 13
C2
1V 12
11
+
–
+ COMP2
–
15
REF1
1.9V
VOUT
LTC1164-8 • TA04
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1064
Universal Filter Building Block
This Part, with External Resistors, Allows Design of Bandpass Filters Similar to
LTC1164-8 (Up to 50kHz)
LTC1164
Universal Filter Building Block
This Part, with External Resistors, Allows Design of Bandpass Filters Similar to
LTC1164-8 (Low Power Up to 20kHz)
LTC1264
Universal Filter Building Block
This Part, with External Resistors, Allows Design of Bandpass Filters Similar to
LTC1164-8 (Up to 100kHz)
See Table 4 for additional information
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417● (408) 432-1900
FAX: (408) 434-0507● TELEX: 499-3977 ● www.linear-tech.com
11648fa LT/TP 1297 REV A 4K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1995