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LTC1064-1 Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter
FEATURES

DESCRIPTIO
8th Order Filter in a 14-Pin Package No External Components 100:1 Clock to Center Ratio 150VRMS Total Wideband Noise 0.03% THD or Better 50kHz Maximum Corner Frequency Operates from 2.37V to 8V Power Supplies Passband Ripple Guaranteed Over Full Military Temperature Range
The LTC(R)1064-1 is an 8th order, clock sweepable elliptic (Cauer) lowpass switched capacitor filter. The passband ripple is typically 0.15dB, and the stopband attenuation at 1.5 times the cutoff frequency is 68dB or more. An external TTL or CMOS clock programs the value of the filter's cutoff frequency. The clock to cutoff frequency ratio is 100:1. No external components are needed for cutoff frequencies up to 20kHz. For cutoff frequencies over 20kHz two low value capacitors are required to maintain passband flatness. The LTC1064-1 features low wideband noise and low harmonic distortion even for input voltages up to 3VRMS. In fact the LTC1064-1 overall performance completes with equivalent multiple op amp RC active realizations. The LTC1064-1 is available in a 14-pin DIP or 16-pin surface mounted SW package. The LTC1064-1 is pin compatible with the LTC1064-2.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S

Antialiasing Filters Telecom PCM Filters
TYPICAL APPLICATIO
1 VIN 2 3 8V 0.1F 14 13
8th Order Clock Sweepable Lowpass Elliptic Antialiasing Filter
15 0 -15
INV C VIN
R(h, I) COMP2*
VOUT/VIN (dB)
12 V- AGND 4 + LTC1064-1 11 CLOCK fCLK V (TTL, 5MHz) 5 10 NC AGND 6 7 COMP1* INV A VOUT NC 9 8 VOUT
-8V 0.1F
-30 -45 -60 -75 -90 -105 0 5 10 15 20 25 30 FREQUENCY (kHz) 35 40
1064 TA01
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1F CAPACITOR CLOSE TO THE PACKAGE. FOR SERVO OFFSET NULLING APPLICATIONS, PIN 1 IS THE 2ND STAGE SUMMING JUNCTION. *FOR CUTOFF FREQUENCY ABOVE 20kHz, USE COMPENSATION CAPACITORS (5pF TO 56pF) BETWEEN PIN 13 AND PIN 1 AND PIN 6 AND PIN 7.
8th ORDER CLOCK SWEEPABLE LOWPASS ELLIPTIC ANTIALIASING FILTER MAINTAINS, FOR 0.1Hz fCUTOFF 10kHz, A 0.15dB PASSBAND RIPPLE AND 72dB STOPBAND ATTENUATION AT 1.5 x fCUTOFF. TOTAL WIDEBAND NOISE = 150VRMS, THD = 0.03% FOR VIN = 1VRMS
10641fa
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Frequency Response
1064 TA02
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1
LTC1064-1
ABSOLUTE AXI U RATI GS
Total Supply Voltage (V + to V -) ............................ 16.5V Power Dissipation .............................................. 400mW Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER I FOR ATIO
TOP VIEW INV C VIN AGND V+ AGND COMP1 INV A 1 2 3 4 5 6 7 14 R(h, l) 13 COMP2 12 V - 11 fCLK 10 NC 9 8 VOUT NC
ORDER PART NUMBER
INV C 1
LTC1064-1CN LTC1064-1ACN
N PACKAGE 14-LEAD PDIP TJMAX = 110C, JA = 70C/W J PACKAGE 14-LEAD CERDIP
OBSOLETE PACKAGE
Consider the N14 Package for Alternate Source
LTC1064-1MJ LTC1064-1CJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Passband Gain, LTC1064-1, 1A Gain TempCo Passband Edge Frequency, fC Gain at fC LTC1064-1 LTC1064-1A -3dB Frequency Passband Ripple (Note 1) LTC1064-1 LTC1064-1A Ripple TempCo Stopband Attenuation LTC1064-1 LTC1064-1A Stopband Attenuation LTC1064-1 LTC1064-1A CONDITIONS
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 7.5V, fCLK = 1MHz, R1 = 10k, C1 = 10pF, TTL or CMOS clock input level unless otherwise specified.
MIN
Referenced to 0dB, 1Hz to 0.1fC
Referenced to Passband Gain

0.1fC to 0.85fC Referenced to Passband Gain, Measured at 6.25kHz and 8.5kHz
At 1.5fC Referenced to 0dB

At 2fC Referenced to 0dB

2
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W
WW
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(Note 1)
Operating Temperature Range LTC1064-1M (OBSOLETE) ............... - 55C to 125C LTC1064-1C/AC .................................. - 40C to 85C
TOP VIEW 16 R(h, l) 15 COMP2 14 V-
ORDER PART NUMBER LTC1064-1CSW
VIN 2 AGND 3 V+ 4 AGND 5 NC 6 COMP1 7 INV A 8
13 NC 12 fCLK 11 NC 10 NC 9 VOUT
SW PACKAGE 16-LEAD PLASTIC (WIDE) SO TJMAX = 150C, JA = 90C/W
TYP 0.1 0.0002 10 1%
MAX 0.35
UNITS dB dB/C kHz
-1.25 - 0.75 10.7
0.85 0.65
dB dB kHz

0.15 0.1 0.0004 66 68 67 68 72 72 72 72
0.32 0.19
dB dB dB/C dB dB dB dB
10641fa
LTC1064-1
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VS = 7.5V, fCLK = 1MHz, R1 = 10k, C1 = 10pF, TTL or CMOS clock input level unless otherwise specified.
PARAMETER Input Frequency Range Output Voltage Swing and Operating Input Voltage Range Total Harmonic Distortion Wideband Noise Output DC Offset LTC1064-1 LTC1064-1A Output DC Offset TempCo Input Impedance Output Impedance Output Short-Circuit Current Clock Feedthrough Maximum Clock Frequency Power Supply Current 50% Duty Cycle, VS = 7.5V VS = 2.37V VS = 5V

ELECTRICAL CHARACTERISTICS
CONDITIONS VS = 2.37V VS = 5V VS = 7.5V
MIN 0

TYP
MAX fCLK/2
UNITS kHz V V V
1 3 5 0.015 0.03 150 165 50 50 -100 10 20 2 3/1 200 5 10 12 16 22 23 26 28 32 8 175 125
VS = 5V, Input = 1VRMS at 1kHz VS = 7.5V, Input = 3VRMS at 1kHz VS = 5V, Input = GND 1Hz to 999kHz VS = 7.5V, Input = GND 1Hz to 999kHz VS = 7.5V, Pin 2 Grounded
% % VRMS VRMS mV mV V/C k mA VRMS MHz mA mA mA mA mA V
VS = 5V f OUT = 10kHz Source/Sink
VS = 7.5V, f CLK = 1MHz
Power Supply Voltage Range Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
2.37
Note 2: For tighter specifications please contact LTC Marketing.
TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency
15 0 -15
GAIN (dB)
-30 -45 -60 -75 -90 VS = 5V TA = 25C f CLK = 1MHz fC = 10kHz 0.1dB f -3dB = 10.7kHz 1 10 FREQUENCY (kHz) 100
1064 G01
-180 -225 -270 -315 -360 -405 -450 0 1 2 3 45678 FREQUENCY (kHz) 9 10 11
1064 G02
GROUP DELAY (s)
PHASE (DEG)
-105
UW
Phase vs Frequency
0 -45 -90 -135 VS = 5V TA = 25C f CLK = 1MHz fC = 10kHz
500
Group Delay
VS = 5V 450 TA = 25C 400 f CLK = 1MHz fC = 10kHz 350 300 250 200 150 100 50 0 0 1 2 3 4 5 6 7 8 9 10 11 12 FREQUENCY (kHz)
1064 G03
10641fa
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LTC1064-1 TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency
15 0 -15 fCLK = 2MHz, fC = 20kHz COMP1 NOT USED, COMP2 = 20pF fCLK = 3MHz, fC = 30kHz COMP1 = 24pF COMP2 = 36pF fCLK = 4MHz, fC = 40kHz COMP1 = 36pF COMP2 = 47pF VS = 5V TA = 25C 1 10 FREQUENCY (kHz) 100
1064 G04
GAIN (dB)
GAIN (dB)
-45 -60 -75 -90
-45 -60 -75 -90
fCLK = 4MHz, fC = 40kHz COMP1 = 20pF COMP2 = 30pF fCLK = 5MHz, fC = 50kHz COMP1 = 30pF COMP2 = 47pF VS = 7.5V TA = 25C 1 10 FREQUENCY (kHz) 100
1064 G05
GAIN (dB)
-30
-105
Typical Wideband Noise (151VRMS) VS = 5V, TA = 25C f CLK = 1MHz, f C = 10kHz Input Grounded
POWER SUPPLY CURRENT (mA)
PI FU CTIO S
(Pin Numbers Refer to the 14-Pin Package)
COMP1, INV A, COMP2, INV C (Pins 1,6,7, and 13): For filter cutoff frequencies higher than 20kHz, in order to minimize the passband ripple, compensation capacitors should be added between Pin 6 and Pin 7 (COMP1) and Pin 1 and Pin 13 (COMP2). For COMP1 (COMP2), add 1pF (1.5pF) mica capacitor for each kHz increase in cutoff frequency above 20kHz. For more detail refer to Gain vs Frequency graphs. VIN, VOUT (Pins 2, 9): The input Pin 2 is connected to an 18k resistor tied to the inverting input of an op amp. Pin 2
4
UW
Gain vs Frequency
15 0 -15 -30 fCLK = 3MHz, fC = 30kHz COMP1 = 10pF COMP2 = 15pF 5 0 -5 -10 -15 -20
Gain vs Frequency
25C GAIN PEAK = 0.4dB AT 30kHz
-105
VS = 7.5V fCLK = 5MHz 125C GAIN PEAK = f = 50kHz 1dB AT 35kHz -30 C COMP1 = 33pF COMP2 = 56pF -35 1 10 FREQUENCY (kHz) -25
100
1064 G06
Total Harmonic Distortion (0.025%) VS = 7.5V, TA = 25C f CLK = 1MHz, f C = 10kHz Input = 1kHz at 3VRMS
48 44 40 36 32 28 24 20 16 12 8 4 0
Power Supply Current vs Power Supply Voltage
f CLK = 1MHz
TA = -55C TA = 25C TA = 125C
02
4 6 8 10 12 14 16 18 20 22 24 TOTAL POWER SUPPLY VOLTAGE (V)
1064 G09
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is protected against static discharge. The device's output, Pin 9, is the output of an op amp which can typically source/ sink 3mA/1mA. Although the internal op amps are unity gain stable, driving long coax cables is not recommended. When testing the device for noise and distortion, the output, Pin 9, should be buffered (Figure 4). The op amp power supply wire (or trace) should be connected directly to the power source. AGND (Pins 3, 5): For dual supply operation these pins should be connected to a ground plane. For single supply
10641fa
LTC1064-1
PI FU CTIO S
operation both pins should be tied to one half supply (Figure 2). Also Pin 8 and Pin 10, although they are not internally connected should be tied to analog ground or system ground. This improves the clock feedthrough performance. V +, V - (Pins 4, 12): The V+ and V- pins should be bypassed with a 0.1F capacitor to an adequate analog ground. Low noise, nonswitching power supplies are recommended. To avoid latchup when the power supplies exhibit high turn-on transients, a 1N5817 Schottky diode should be added from the V + and V - pins to ground (Figure 1). INV A, R(h, I) (Pins 7, 14): A very short connection between Pin 14 and Pin 7 is recommended. This connection should be preferably done under the IC package. In a
TYPICAL APPLICATIO S
1 VIN 2 3 V+ 1N5817 0.1F INV C VIN R(h, I) COMP2* 14 13 V- 1N5817 0.1F
AGND 4 + LTC1064-1 11 fCLK V 5 6 7 AGND COMP1* INV A NC VOUT NC 10 9 8
12 V-
Figure 1. Using Schottky Diodes to Protect the IC from Power Supply Spikes
1 VIN 2 3 V+ 5k 4 5 6 0.1F 5k 7
INV C VIN
R(h, I) COMP2*
14
13
AGND LTC1064-1 11 fCLK V+ AGND COMP1* INV A NC VOUT NC 10 9 8
12 V-
Figure 3. Level Shifting the Input T2L Clock for Single Supply Operation, V+ >6V.
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(Pin Numbers Refer to the 14-Pin Package)
breadboard, use a one inch, or less, shielded coaxial cable; the shield should be grounded. In a PC board, use a one inch trace or less; surround the trace by a ground plane. NC (Pins 8, 10): The "no connection" pins preferably should be grounded. fCLK (Pin 11): For 5V supplies the logic threshold level is 1.4V. For 8V and 0V to 5V supplies the logic threshold levels are 2.2V and 3V respectively. The logic threshold levels vary 100mV over the full military temperature range. The recommended duty cycle of the input clock is 50% although for clock frequencies below 500kHz the clock "on" time can be as low as 200ns. The maximum clock frequency for 5V supplies is 4MHz. For 7V supplies and above, the maximum clock frequency is 5MHz. Do not allow the clock levels to exceed the power supplies. For clock level shifting (see Figure 3).
1 VIN 2 3 V+= 15V 0.1F 5k
VOUT
INV C VIN
R(h, I) COMP2*
14 13
12 V- AGND LTC1064-1 4+ 11 fCLK V 5 6 V+/2 0.1F 5k 7 AGND COMP1* INV A NC VOUT NC 10 9 8
0V TO 10V
VOUT
1064 F01
1064 F02
Figure 2. Single Supply Operation. If Fast Power Up or Down Transients are Expected, Use a 1N5817 Schottky Diode Between Pin 4 and Pin 5.
1 VIN 2 3 R(h, I) 14 COMP2* 13 POWER SOURCE V+ V-
INV C VIN
V+ 2.2k T LEVEL 5k 1F VOUT
2L
12 V- AGND LTC1064-1 4+ 11 fCLK V 0.1F 5 6 AGND COMP1* NC VOUT NC 10 9 8 10k
0.1F 10k 0.1F
-
VOUT
7 INV A
+
1064 F03
RECOMMENDED OP AMPS: LT1022, LT318, LT1056
1064 F04
0.1F
Figure 4. Buffering the Filter Output. The Buffer Op Amp Should Not Share the LTC1064-1 Power Lines.
10641fa
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LTC1064-1
TYPICAL APPLICATIO S
Transitional Elliptic-Bessel Dual 5th Order Lowpass Filter
C
15 0
1 VIN1 2 3 V+ 0.1F
INV C VIN
R(h, I) COMP2*
14 13 V-
VOUT/VIN (dB)
AGND LTC1064-1 4+ 11 fCLK = 200 fCLK V x f-3dB 5 10 NC AGND 6 COMP1* INV A VOUT NC
1064 TA06
12 V-
9 8 C=
C 47.5k VIN2
7
OUTPUT1 WIDEBAND NOISE: 50VRMS OUTPUT2 WIDEBAND NOISE: 110VRMS
Transient Response to a 2V Step Input VOUT2
1V/DIV
0.1ms/DIV
Adding an Output Buffer-Filter to Eliminate Any Clock Feedthrough Over a 10:1 Clock Range, for fCLK = 2kHz to 20kHz
1 VIN 2 3 V+ 0.1F 4 5 6 7 14 13 V- 0.1F 200pF 10k VOUT
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Amplitude Response
f -3dB = 5kHz f CLK = 1MHz
47.5k
-
LT1056 VOUT1
-15 VOUT2 -30 -45 -60 -75 -90 VOUT1
+
0.1F
VOUT2 5 f -3dB (F)
-105
1
10 fIN (kHz)
100
1064 TA09
Transient Response to a 2V Step Input VOUT1
1V/DIV
0.1ms/DIV
INV C VIN
R(h, I) COMP2*
AGND LTC1064-1 11 fCLK V+ AGND COMP1* INV A NC VOUT NC 10 9 8 4.99k
12 V-
4.99k
-
LT1056
50 0.027F
1064 TA10
430pF
+
10641fa
LTC1064-1
PACKAGE DESCRIPTIO
.300 BSC (7.62 BSC)
.008 - .018 (0.203 - 0.457)
0 - 15
.045 - .065 (1.143 - 1.651) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .014 - .026 (0.360 - 0.660)
.770* (19.558) MAX 14 13 12 11 10 9 8
.255 .015* (6.477 0.381)
1
2
3
4
5
6
.030 .005 TYP N
.420 MIN
1
2
RECOMMENDED SOLDER PAD LAYOUT .291 - .299 (7.391 - 7.595) NOTE 4 .010 - .029 x 45 (0.254 - 0.737)
0 - 8 TYP
.005 (0.127) RAD MIN
.009 - .013 (0.229 - 0.330)
NOTE 3 .016 - .050 (0.406 - 1.270)
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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J Package 14-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
.200 (5.080) MAX .015 - .060 (0.381 - 1.524) .005 (0.127) MIN .785 (19.939) MAX 14 13 12 11 10 9 8 .025 (0.635) RAD TYP .100 (2.54) BSC .125 (3.175) MIN
J14 0801
.220 - .310 (5.588 - 7.874)
1
2
3
4
5
6
7
OBSOLETE PACKAGE
N Package 14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
.300 - .325 (7.620 - 8.255) .130 .005 (3.302 0.127) .020 (0.508) MIN .008 - .015 (0.203 - 0.381) +.035 .325 -.015 7 .005 (0.125) .100 MIN (2.54) BSC .045 - .065 (1.143 - 1.651)
.065 (1.651) TYP .120 (3.048) MIN .018 .003 (0.457 0.076)
(
8.255
+0.889 -0.381
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
N14 1002
SW Package 16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 .005 .398 - .413 (10.109 - 10.490) NOTE 4 16 15 14 13 12 11 10 9
N .325 .005 NOTE 3 .394 - .419 (10.007 - 10.643)
3
N/2
N/2
NOTE: 1. DIMENSIONS IN
1 .093 - .104 (2.362 - 2.642)
2
3
4
5
6
7
8 .037 - .045 (0.940 - 1.143)
.050 (1.270) BSC
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. 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 4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.004 - .012 (0.102 - 0.305)
S16 (WIDE) 0502
.014 - .019 (0.356 - 0.482) TYP
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LTC1064-1
TYPICAL APPLICATIO
V+ 0.1F
C 47.5k
VIN
Amplitude Response
15 0 -15 f -3dB = 3kHz f CLK = 750kHz
VOUT/VIN (dB)
-30 -45 -60 -75 -90
-105
1
10 fIN (kHz)
RELATED PARTS
PART NUMBER LTC1069-1 LTC1069-6 LTC1569-6 LTC1569-7 DESCRIPTION 8th Order Elliptic Lowpass Single Supply, 8th Order Elliptic Lowpass DC Accurate, 10th Order, Lowpass DC Accurate, 10th Order, Lowpass COMMENTS S0-8 Package, Low Power S0-8 Package, Very Low Power Internal Precision Clock, Low Power Internal Precision Clock, S0-8 Package
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
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Transitional Elliptic-Bessel 10th Order Lowpass Filter
C 47.5k 1 2 3 INV C VIN R(h, I) COMP2* 14 13 V-
-
LT1056 VOUT
12 V- AGND LTC1064-1 4+ 11 fCLK = 250 fCLK V x f-3dB 5 10 NC AGND 6 7 COMP1* INV A VOUT NC 9 8 C=
1064 TA03
+
0.1F
3 (F) f -3dB
OUTPUT WIDEBAND NOISE:110VRMS
Transient Response to a 2V Step Input
1V/DIV
0.1ms/DIV
100
1064 TA05
10641fa LW/TP 1202 1K REV A * PRINTED IN USA
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1989

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