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LTC1164-8 Ultraselective, Low Power 8th Order Elliptic Bandpass Filter with Adjustable Gain
FEATURES

DESCRIPTION
The LTC(R)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. 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 270VRMS wideband noise of the LTC1164-8 is independent of the filter's center frequency. 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.
Ultraselectivity (50dB Attenuation at 4% of Center Frequency) Adjustable Passband Gain Noise Independent of Gain Filter Noise: 270VRMS, 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)
APPLICATIONS

Asynchronous Narrowband Signal Detectors Low Frequency Asynchronous Demodulators Handheld Spectrum Analyzers In-Band Tone Signaling Detectors
TYPICAL APPLICATION
Ultranarrow 1kHz Bandpass Filter with Gain = 10 Gain = 340k/R IN, 1/(2 * RF * CF) 10 * Center Frequency
RIN 34k VIN 5V 1 2 3 4 5 6 7 LTC1164-8 14 13 11 10 9 8 3 SHORT CONNECTION UNDER IC AND SHIELDED BY A GROUND PLANE 2 12 CF 200pF RF 61.9k 5V
30 20 10 0
GAIN (dB)
-5V 100kHz
-10 -20 -30 -40
- +
7 6 VOUT
LT (R)1006 4 -5V
-50 -60
LTC1164-8 * TA01
-70
0.90
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Frequency Response
50dB
0.95 1.05 1.00 FREQUENCY (kHz)
1.10
1.15
1164-8 TA02
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LTC1164-8
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* .................. 0C to 70C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C 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.
PACKAGE/ORDER INFORMATION
TOP VIEW NC INVB AGND V+ AGND NC INVA 1 2 3 4 5 6 7 N PACKAGE 14-LEAD PDIP
TJMAX = 110C, JA = 65C/ W
ORDER PART NUMBER
14 R(h, l) 13 NC 12 V - 11 fCLK 10 NC 9 8 IOUT NC
LTC1164-8CN
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER Gain at Center Frequency VS = 2.375V VS = 5V Gain at 0.995 * Center Frequency and 1.005 * Center Frequency (Referenced to Gain at Center Frequency) Lower Stopband Attenuation (Referenced to Gain at Center Frequency) VS = 2.375V VS = 5V VS = 2.375V
(See Test Circuit)
TA = 25C, Center Frequency = fCLK /100, fCLK = 100kHz (the clock signal is a TTL or CMOS square wave, clock rise or fall time 1s), the AC test signal level is 1VRMS for VS = 5V or 0.5VRMS for VS = 2.375V, unless otherwise specified.
CONDITIONS fIN = 1000Hz
VS = 5V
2
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TOP VIEW NC INVB AGND V+ AGND NC NC INVA 1 2 3 4 5 6 7 8 16 R(h, l) 15 NC 14 V - 13 NC 12 fCLK 11 NC 10 NC 9 IOUT
ORDER PART NUMBER LTC1164-8CSW
SW PACKAGE 16-LEAD PLASTIC SO WIDE TJMAX = 110C, JA = 85C/ W
MIN -3 -4 -3 -4 -9 -9
TYP 0 1.5 0 2.0 0 1.5 0 2.0
MAX 3 4 3 4 3 3
UNITS dB dB dB dB dB dB dB dB dB dB dB dB dB
fIN = 1000Hz
fIN = 995Hz fIN = 1005Hz fIN = 995Hz fIN = 1005Hz fIN = 960Hz (Note 1) fIN = 800Hz fIN = 960Hz (Note 1) fIN = 800Hz

- 48 - 50 - 48 - 48
- 3 2 - 3 2 - 52 - 52 - 52 - 52
- 58 - 60
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LTC1164-8
ELECTRICAL CHARACTERISTICS
PARAMETER Upper Stopband Attenuation (Referenced to Gain at Center Frequency) VS = 2.375V
(See Test Circuit)
TA = 25C, Center Frequency = fCLK /100, fCLK = 100kHz ( the clock signal is a TTL or CMOS square wave, clock rise or fall time 1s), the AC test signal level is 1VRMS for VS = 5V or 0.5VRMS for VS = 2.375V, unless otherwise specified.
CONDITIONS fIN = 1040Hz (Note 1) fIN = 1200Hz
MIN - 48 - 50 - 48 - 48
TYP - 52 - 52 - 52 - 52 1.0 2.5 - 40 50 - 50 60 2.3
MAX - 58 - 60
UNITS dB dB dB dB dB VRMS VRMS mV mV
VS = 5V Maximum Output for < 0.25% Total Harmonic Distortion Output DC Offset Power Supply Current (Note 2) VS = 2.5V VS = 5V
fIN = 1040Hz (Note 1) fIN = 1200Hz fIN = 1000Hz fIN = 1000Hz
VS = 2.5V (At the Output of External Op Amp) VS = 5V VS = 2.375V
4.0 4.5 7.0 8.0 11.0 12.5 8
mA mA mA mA mA mA V
VS = 5V
3.2 4.5
VS = 7.5V Power Supply Range 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. 2.375
Note 2: The maximum current over temperature is at 0C. At 70C the maximum current is less than its maximum value at 25C.
TYPICAL PERFORMANCE CHARACTERISTICS
Gain vs Frequency
TA = 25C 0 VS = 5V = 100kHz f -10 CLK -20 10
GAIN (dB)
GAIN (dB)
-6 -9 -12 -15 -18 990 VS = 7.5V
GAIN (dB)
-30 -40 -50 -60 -70 -80 -90 760 880 1120 1000 FREQUENCY (Hz) 1240
LTC1164-8 * TPC01
UW
Passband Variations vs Power Supply
fCLK = 100kHz GAIN = 1 0 R = 340k IN RF = 61.9k -3 3
6
Passband Gain and Phase vs Frequency
VS = 2.5V
3 0 -3 TA = 25C VS = 5V fCLK = 100kHz 180 120 60 0
VS = 5V
PHASE (DEG)
-6 -9 -12 -15 -18 -21 -24
-60 -120 -180 -240 -300 -360 984 992 1008 1000 FREQUENCY (Hz) 1016
LTC1164-8 * TPC03
995
1000 FREQUENCY (Hz)
1005
1010
-420
LTC1164-8 * TPC02
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LTC1164-8 TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain and Delay vs Frequency
6 TA = 25C 3 VS = 5V = 100kHz f 0 CLK -3
GAIN (dB)
20 LOG (THD + NOISE/VIN) (dB)
80 70
DELAY (ms)
-32 -38 -44 -50 -56 -62 -68 -74 -80 0.01
20 LOG (THD + NOISE/VIN) (dB)
-6 -9 -12 -15 -18 -21 -24 984 992 1008 1000 FREQUENCY (Hz) 1016
LTC1164-8 * TPC04
THD + Noise vs Input Voltage
TA = 25C VS = SINGLE 5V fIN = 1kHz -50 fCLK = 100kHz FILTER GAIN AT fCENTER = 1 OUTPUT OP AMP IS LT1006 -60 -40
POWER SUPPLY CURRENT (mA)
20 LOG (THD + NOISE/VIN) (dB)
OUTPUT LEVEL (dBV)
AGND AT 2.5V AGND AT 2V
-70
-80 0.5 1.0 1.5 2.0 2.5 INPUT VOLTAGE (VP-P) 3.0 3.5
4
UW
LTC1164-8 * TPC07
THD + Noise vs Input Voltage
100 90
-20 -26 TA = 25C VS = 5V fIN = 1kHz fCLK = 100kHz FILTER GAIN AT fCENTER = 1 OUTPUT OP AMP IS LT1006 -20 -26 -32 -38 -44 -50 -56 -62 -68 -74 0.1 1 INPUT VOLTAGE (VRMS) 5
THD + Noise vs Input Voltage
TA = 25C VS = SINGLE 5V fIN = 1kHz fCLK = 100kHz FILTER GAIN AT fCENTER = 1 OUTPUT OP AMP IS LT1006 AGND = 2.5V AGND = 2V
60 50 40 30 20 10 0
-80 0.01
0.1 INPUT VOLTAGE (VRMS)
1
2
LTC1164-8 * TPC05
LTC1164-8 * TPC06
Power Supply Current vs Power Supply Voltage
5.0 25C 4.0 70C 3.0
-10 -20 -30 -40 -50 10 0
Output vs Input
fCLK = 100kHz fCENTER = 1kHz fIN = 1kHz
VS = SINGLE 5V (PINS 3, 5 AT 2V)
2.0
1.0
VS = 5V
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
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LTC1164-8
PIN FUNCTIONS
V +, V - (Pins 4, 12): Power Supply Pins. The V + (Pin 4) and the V - (Pin 12) should be bypassed with a 0.1F 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/s. 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. 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
VIN
7
8
Figure 1. Dual Power Supply Operation (Gain = 1)
RF 61.9k 5V fCLK
RIN 340k VIN
1 2 3
14 13 12 LTC1164-8 11 10
5V 0.1F 15k
4 5 6 7
+
1F 10k
8
Figure 2. Single Power Supply Operation (Gain = 1)
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+
3
-
9
2
+
*FOR SURFACE MOUNT CIRCUITS USE MOTOROLA DIODE MBR0530 OR EQUIVALENT
3
-
5V *1N4148 OR EQUIVALENT
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(14-Lead PDIP)
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 1s. 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 1s.
Table 1. Clock Source High and Low Threshold Levels
POWER SUPPLY Single Supply = 5V Single Supply = 12V Dual Supply = 2.5V Dual Supply = 5V Dual Supply = 7.5V HIGH LEVEL >1.45V >7.80V >0.73V >1.45V >2.18V LOW LEVEL <0.5V <6.5V <- 2.0V <0.5V <0.5V
RIN 340k
1 2 3 4 LTC1164-8
14 13 12 11 10 9 fCLK 0.1F -5V 1N4148* OR EQUIVALENT 2
RF 61.9k 5V 0.1F 7 6 4 0.1F -5V VOUT
LTC1164-8 * F01
0.1F
5 6
0.1F 7 6 4
LTC1164-8 * F02
VOUT
5
LTC1164-8
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 1F (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 VS 1N4148 0.1F 1 2 3 4 5 6 7 LTC1164-8 14 13 12 11 10 8 9 0.1F -VS 1N4148 0.1F 61.9k 15V
fCLK 100kHz
6
+
3
-
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U
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2
7 LT1220 4 -15V 0.1F
LTC1164-8 * TC
6
VOUT
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LTC1164-8
APPLICATIONS INFORMATION
Passband Gain and Dynamic Range 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 1 2 5 10 20 50 100 200 500 1000 RIN (1%) 340k 169k 68.1k 34k 16.9k 6.81k 3.4k 1.69k 680 340 RF (1%) 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k GAIN IN dB RIN (1%) 0 10 15 20 25 30 35 40 45 50 340k 107k 60.4k 34k 19.1k 10.7k 6.01k 3.4k 1.91k 1.07k RF (1%) 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k 61.9k
3 VS = 5V RIN = 340k 0 R = 61.9k F -3 GAIN (dB) -6 -9 -12 -15 -18 -0.50 fCENTER 1.00 0.50 -1.00 PERCENT DEVIATION FROM fCENTER (% fCENTER)
LTC1164-8 * F03
Table 3. LTC1164-8 Noise with Its Input Grounded
POWER SUPPLY 5V Single 5V NOISE (VRMS) 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
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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: (S/N)OUT/(S/N)IN = 20 * Log (BW)IN/(BW)f where, (BW)IN = noise bandwidth at the input of the filter (BW)f = 0.01 * fCENTER = noise equivalent filter bandwidth 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 * Log3.4kHz/ 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
APPLICATIONS INFORMATION
Table 4. Recommended Op Amps for LTC1164-8
SINGLE LT1006 LT1012 LT1077 DUAL LT1013 LT1078 LT1112 LT1413 QUAD LT1014 LT1079 LT1114
10mV/DIV
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)
INPUT FREQUENCY 99.04kHz (or 100.96kHz) 99.02kHz (or 100.98kHz) 99.01kHz (or 100.99kHz) 99.005kHz (or 100.995Hz) 99.00kHz (or 101.00kHz) 98.995kHz (or 101.005kHz) 98.99kHz (or 101.01kHz) 98.98kHz (or 101.02kHz) 98.96kHz (or 101.04kHz) OUTPUT LEVEL (RELATIVE TO INPUT) < - 50dB < - 40dB < - 6dB - 3dB 2dB 0dB 1dB - 3dB 2dB < - 6dB < - 40dB < - 50dB OUTPUT FREQUENCY (ALIAS FREQUENCY) 960Hz 980Hz 990Hz 995Hz 1000Hz 1005Hz 1010Hz 1020Hz 1040Hz
VS = 5V fCLK = 500kHz fCENTER = 5kHz 5ms/DIV
LTC1164-8 * F05
1V/DIV FOR INPUT 20mV/DIV FOR OUTPUT
2V/DIV
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Clock Feedthrough
A
B
LT1006 VS = 5V fCLK = 100kHz
5s/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/(2 * RF * CF) = 10 * fCENTER
Transient Response
OUTPUT
INPUT
Figure 5. Square Wave Input (2.5V)
OUTPUT
INPUT
VS = 5V fCLK = 100kHz fCENTER = 1kHz
50ms/DIV
LTC1164-8 * F06
Figure 6. Sine Wave Burst Input
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LTC1164-8
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 0.1F 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.
TYPICAL APPLICATIONS N
Tone Detector and Average Value Circuit
RIN 340k VIN 5V 1N4148 0.1F 1 2 3 4 5 6 7 LTC1164-8 14 13 12 11 10 8 9 0.1F -5V 1N4148 RF 61.9k 5k 1N458 CF A
1/2 LT1413
fCLK 100kHz 5k 5V 0.1F
5k
A C2
-5V
0.1F
B C3
VOUT = AVERAGE OF ABS [VPEAK x SIN (2 x fCENTER x t)], 10% FROM 1VP-P TO 7VP-P RIN = 340k/GAIN; fCENTER = fCLK/100; 1/(2 x RF x CF) 10 x fCENTER 1/(2 x R1 x C1) fCENTER/10; 1/(2 x R2 x C2) fCENTER/25; R2 x C2 = R3 x C3
+
+
R2 100k
1/2 LT1413 11 R3 100k
-
-
5k
4 5k
1/2 LT1413
+
-
+
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5k
1N458
C1
R1 10k
B
1/2 LT1413
VOUT
LTC1164-8 * TA03
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LTC1164-8
PACKAGE DESCRIPTION
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 -0.015 8.255 +0.635 -0.381 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).
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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
0.255 0.015* (6.477 0.381)
1
2
3
4
5
6
7
0.130 0.005 (3.302 0.127) 0.015 (0.380) MIN
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
N14 0694
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LTC1164-8
PACKAGE DESCRIPTION
0.005 (0.127) RAD MIN
0.291 - 0.299 (7.391 - 7.595) (NOTE 2) 0.010 - 0.029 x 45 (0.254 - 0.737)
0 - 8 TYP
0.009 - 0.013 (0.229 - 0.330)
NOTE 1 0.016 - 0.050 (0.406 - 1.270)
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.
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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
NOTE 1
0.394 - 0.419 (10.007 - 10.643)
1
2
3
4
5
6
7
8
0.093 - 0.104 (2.362 - 2.642)
0.037 - 0.045 (0.940 - 1.143)
0.050 (1.270) TYP
0.004 - 0.012 (0.102 - 0.305)
0.014 - 0.019 (0.356 - 0.482) TYP
SOL16 0392
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LTC1164-8
TYPICAL APPLICATION
Tone Detector -- Detecting a Low Level Signal Buried in Wideband Noise
fCLK 5V R2 10k 5V 1 C1 R1 10k 0.1F 8 18 STROBE LTC1040
1 RIN VIN 5V 0.1F 2 3 4 5 1F 6 7 LTC1164-8
5V 30.1k AGND (2V) 0.1F 1k REF1 (1.9V) 8.87k REF2 (1V) 10k
4
1/2 LT1413
C2 R3 10k
0.1F
0.1F
RELATED PARTS
PART NUMBER LTC1064 LTC1164 LTC1264 DESCRIPTION Universal Filter Building Block Universal Filter Building Block Universal Filter Building Block COMMENTS This Part, with External Resistors, Allows Design of Bandpass Filters Similar to LTC1164-8 (Up to 50kHz) This Part, with External Resistors, Allows Design of Bandpass Filters Similar to LTC1164-8 (Low Power Up to 20kHz) This Part, with External Resistors, Allows Design of Bandpass Filters Similar to LTC1164-8 (Up to 100kHz)
See Table 4 for additional information
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
LT 10/09 REV B * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1995
- + - +
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/RIN AND IS THE FILTER GAIN AT fCENTER RIN = 340k/GAIN; fCENTER = fCLK/100; 1/(2 * RF * CF) 10 * fCENTER 1/(2 * R1 * C1) fCENTER/10; 1/(2 * R3 * C2) fCENTER/32
14 REF2 13 1V 12 11
- + - +
1/2 LT1413
+
-
8
+
-
+
U
14 13 12 11 10 9
CF
0.1F
RF 61.9k
REF1 1.9V
5 6 7 8
COMP1
4
COMP2
15
VOUT
LTC1164-8 * TA04
11648fb

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