1 kHz to 1.28 MHz 8-Bit Programmable
2" x 4"
8-Pole Filters
Description
The 818 Series are digitally programmable low-pass and high-pass active filters that are tunable over a 256:1 frequency range.818 filters are available with any one of five standard factory-set tuning ranges or 8-bit custom ranges from 1 kHz to 1.28 MHz.These units contain 8 CMOS logic inputs.
818 Series models are convenient, low profile, easy to use fully finished filters which require no external components or adjustments.They feature low harmonic distortion, and near theoretical amplitude characteristics.818 filters operate from non-critical ±12 to ±18 Vdc power supplies, have a 5 k ?(min.)input impedance, a 10?(max.) output impedance and low-pass models offer dc voltage offset adjustment.Features/Benefits:
?Low harmonic distortion and wide signal-to-noise ratio to 12-bit resolution
?Digitally programmable corner frequency allows selecting cut-off frequencies specific to each application
?Plug-in ready-to-use, reducing engineering design and manufacturing cycle time
?Factory-set tuning range, no external clocks or adjustments needed
?Broad range of transfer characteristics and corner frequencies to meet a wide range of applications Applications
?Anti-alias and band-pass filtering ?Data acquisition systems ?Satellite and telecommunications
?Acoustic and vibration analysis and control ?Aerospace, navigation and sonar
?Medical research and electronic equipment ?Engine test and simulation ?Noise elimination ?Video systems ?Signal reconstruction
Programmable Specifications Page Digital T uning & Control . . . . . . . . . . . . . . . . . . . . . . 2Available Low-Pass Models:Page 818L8B 8-pole Butterworth . . . . . . . . . . . . . . . . . . 3818L8L 8-pole Bessel . . . . . . . . . . . . . . . . . . . . . . 3818L8E 8-pole, 6-zero elliptic, 1.77. . . . . . . . . . . . 3818L8D808-pole, 6-zero constant delay . . . . . . . . . . 3
Available High-Pass Models:Page 818H8B 8-pole Butterworth . . . . . . . . . . . . . . . . . . 4818H8E 8-pole, 6-zero elliptic, 1.77. . . . . . . . . . . . 4General Specifications:
Phase and phase match considerations . . . . . . . 5 & 6Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . 7Pin-out/package data. . . . . . . . . . . . . . . . . . . . . . . . . 7
8-Bit Programmable Filters
Digital Tuning & Control Characteristics
Notes:
1.Frequency data must be present before occurrence of strobe edge.
8-Pole
8-Pole
Phase and Phases 1 kHz to 1.28 MHz
10
-10
-20
-30
-40
-50
-60
-70
-80
d e g r e e s "°"
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
f/fc
5k H z 10k H z 20k H z
40kHz 80kHz 160kHz
320kHz
640kHz
1.28MHz
Phase Deviation from Theoretical
Specification
(25°C and Vs ±15 Vdc)
Pin-Out and Package Data
Ordering Information
Analog Input Characteristics 1Impedance 5 k ?min.Voltage Range ±10 Vpeak Max.Safe Voltage
±Vs Analog Output Characteristics Impedance (Closed Loop) 1 ?typ.10 ?max.Linear Operating Range ±10V Maximum Current 2±5 mA Offset Voltage 3
2 mV typ.10 mV max.Offset Temp.Coeff.50 μV/°C
Power Supply (±V s )Rated Voltage ±15 Vdc
Operating Range
±12 to ±18 Vdc Maximum Safe Voltage ±18 Vdc
Quiescent Current 100 mA typ.120 mA max.Temperature Operating 0 to +70°C Storage
-25 to +85°C
Notes:
1.Input and output signal voltage referenced to supply common.
2.Output is short circuit protected to common.DO NOT CONNECT TO ±Vs.
3.Adjustable to zero.
4.Units operate with or without offset pin connected.
Pin-Out & Package Data
Ordering Information
8-Pole
Bessel
Appendix A
Low-Pass
Normalized Time (1/f sec)
S t e p R e s p o n s e (V /V )
Step Response
12345
-0.2
-0.00.20.40.60.81.01.2Normalized Time (1/f sec)
D e l a y (s e c )
Delay (Normalized)0.1
1.0
Normalized Frequency(f/fc)
A m p (d
B )
Frequency Response 0.1
1.010.0
2
345678
234567-100
-80-60-40-200(sec)Theoretical Transfer Characteristics
1
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.85 0.90 0.95 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.801.90 2.00 2.25 2.50 2.75 3.00 3.25 3.50 4.00 5.006.00 7.00 8.00 9.00 10.01.Normalized Group Delay:
The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc).Normalized Delay
f/fc (Hz)Amp (dB)Phase (deg)Delay -79.2 -89.8 -99.0 -107 -114-33.4 -38.3 -43.1 -51.8 -66.8 -12.1 -13.7 -18.1 -23.1 -28.3 -6.10 -7.08 -8.16
-9.36 -10.7 -2.71 -3.01-3.67 -4.40 -5.20 -1.06 -1.45 -1.91 -2.16 -2.42 0.00 -0.029 -0.117 -0.264 -0.470 -0.737 -610 -626 -638 -647 -655-489 -509 -526 -552 -587 -345 -362 -402 -436 -465 -255 -273 -291 -309 -327 -173 -182 -200 -219 -237 -109 -128 -146 -155 -164 0.00 -18.2 -36.4 -54.7 -72.9 -91.1.052 .038 .029 .023 .018
.241 .201 .170 .126 .077 .482 .468 .417 .352 .291 .505 .504 .502 .498 .492 .506 .506
.506 .506 .506
.506 .506 .506 .506 .506 .506 .506 .506 .506 .506 .506
Low-Pass
8-Pole
Appendix A
Butterworth
0.1
1.0
10.0
2
3456782
34567
Normalized Frequency(f/fc)
-100
-80-60-40-200A m p (d B )
0.1
1.0234
56789Normalized Time (1/f sec)
D e l a y (s e c )
1.5
0.150
12345
Normalized Time (1/f sec)
-0.0
0.20.40.60.81.01.2S t e p R e s p o n s e (V /V )
Frequency Response Delay (Normalized)Step Response
(sec)Theoretical Transfer Characteristics
1
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.85 0.90 0.95 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.801.90 2.00 2.25 2.50 2.75 3.00 3.25 3.50 4.00 5.006.00 7.00 8.00 9.00 10.01.Normalized Group Delay:
The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc).Normalized Delay
f/fc (Hz)Amp (dB)Phase (deg)Delay -125 -135 -144 -153 -160-76.3 -81.9 -87.1 -96.3 -112 -44.6 -48.2 -56.3 -63.7 -70.3 -23.4 -28.2 -32.7 -36.9 -40.8 -1.58 -3.01 -7.48 -12.9 -18.2 -671 -678 -683 -687 -691-621 -629 -635 -646 -661-560 -568 -586 -600 -611-494 -511 -526 -539 -550 -0.001 -0.014 -0.121 -0.311 -0.7380.00 0.00 0.00 0.00 0.00 0.00 -333 -360 -408 -445 -472 -185 -221 -261 -283 -307 0.00 -29.4 -59.0
-89.1
-120
-152
.023 .017 .013 .010 .008
.094 .080 .069 .052 .033.253 .226 .174 .139 .113 .540 .448 .380 .328 .2871.48 1.46 1.17 .873 .672 .956 1.04 1.19 1.29 1.40 .816
.819 .828 .843 .867 .903
Constant Delay
Appendix A
Low-Pass (80 dB)
Normalized Frequency(f/fc)
A m p (d
B )
Normalized Time (1/f sec)
D e l a y (s e c )
Normalized Time (1/f sec)
S t e p R e s p o n s e (V /V )
Frequency Response Delay (Normalized)Step Response
0.1
1.010.0
2
345678
234567-100-80-60-40-2000.1
1.0
1
2345
-0.2
-0.00.20.40.60.81.01.21.Normalized Group Delay:
The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc).Normalized Delay
1.40
1.60
1.80
2.00
2.25
0.90
0.95
1.00
1.10
1.20
0.50 0.60 0.70 0.80 0.850.00
0.10
0.20
0.30
0.40
(sec)
Theoretical Transfer Characteristics
1
f/fc (Hz)Amp (dB)Phase (deg)Delay 6.50
7.00
8.00
9.00
10.0
5.00 5.25 5.50 5.75
6.00 3.75 4.00 4.25 4.50 4.752.50 2.75 3.00 3.25 3.50-86.6 -85.1 -84.1 -84.3 -84.9-92.8 -104 -101 -93.3 -89.9 -98.3 -86.3 -84.1 -85.1 -8
7.9-43.4 -50.3 -57.6 -62.5 -75.4-11.3 -17.1 -23.2 -29.1 -36.3-1.89 -2.41 -3.01 -4.50
-6.39 0.034 -0.157 -0.510 -1.07 -1.44 0.00 0.017 0.058 0.099 0.105-300 -305 -312 -317 -321-462 -466 -289 -293 -295-616 -442 -448 -454 -458-561 -576 -589 -599 -608 -417 -459 -492 -517 -542 -276 -291 -306 -336 -365 -153 -184 -215 -245 -261 0.00 -30.7 -61.3 -92.0 -123 .026 .022 .017 .013 .011.044 .040 .036 .033 .030
.079 .069 .061 .054 .049 .189 .153 .127 .107 .092.656 .512 .396 .312 .239 .849 .846 .841 .821 .783 .852 .852 .852 .851 .850 .852 .852 .852 .852 .852
Elliptic, 1.77
Appendix A
Low-Pass
Normalized Frequency(f/fc)
A m p (d
B )Normalized Time (1/f sec)
D e l a y (s e c )
Normalized Time (1/f sec)
S t e p R e s p o n s e (V /V )
Frequency Response
Delay (Normalized)Step Response
0.1
1.0
0.1
1.010.0
2
345678
234567-100
-80-60-40-2000
1
2345
-0.0
0.20.40.60.81.01.21.Normalized Group Delay:
The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc).Normalized Delay
(sec)Theoretical Transfer Characteristics 1f/fc (Hz)Amp (dB)Phase (deg)Delay 4.00 5.00 6.00 7.002.40 2.60 2.80 3.00 3.50 1.85 1.90 1.95 2.00 2.20 1.50 1.60 1.70 1.75 1.80 1.00 1.10 1.20 1.30 1.40 0.75 0.80 0.85 0.90 0.95 0.50 0.55 0.60 0.65 0.70 8.00 9.00 10.00.00 0.10 0.20 0.30 0.40 -86.2 -87.8 -89.3 -83.1 -82.1 -83.1 -84.6-82.0 -83.5 -88.2 -99.9 -87.2-83.6 -82.0 -83.7 -87.8 -85.8-40.1 -51.5 -65.2 -75.0 -113.0 -0.035 -1.76 -8.28 -18.4 -29.3-0.015 -0.041 -0.046 -0.016 -0.025 0.0070.022 0.033
0.031 0.014 0.00 -0.004 -0.014 -0.024 -0.020-160 -163 -164-140 -148 -154 -157 -289 -295 -301 -305 -134 -440 -444 -447 -450 -280 -578 -594 -606 -611 -616-323 -392 -467 -522 -558-213
-232 -251 -272 -296 -133-148 -163 -179 -196 0.00
-25.7
-51.6
-77.9
-105
0.007 0.005 0.004
0.030 0.018 0.013 0.009 0.099 0.081 0.067 0.057 0.040 0.217 0.198 0.182 0.168 0.126 0.517 0.381 0.296 0.265 0.239 1.65 2.14 1.86 1.19 0.753 0.989 1.04 1.12 1.23 1.40 0.811 0.840 0.872 0.908 0.946
0.713 0.716 0.724 0.740 0.767
High-Pass
8-Pole
Appendix A
Butterworth
0.1
1.010.0
2
345678
234567Normalized Frequency(f/fc)
-100
-80-60-40-200A m p (d B )
Frequency Response (sec)Theoretical Transfer Characteristics
1
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.85 0.90 0.95 1.00 1.20 1.40 1.60 1.80 2.00 2.50
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.0 1.Normalized Group Delay:
The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc).Normalized Delay
f/fc (Hz)Amp (dB)Phase (deg)Delay 0.00 0.00
0.000.000.000.000.000.00 0.000.00 0.00-5.15 -3.01 -0.229 -0.020-0.00259.049.0 42.1
36.8 32.7 29.4-35.5 -24.8
-15.6 -11.6 -8.06-160 -112 -83.7 -63.7 -48.2386360 275226 194 170152 12099.2 74.0 535
499 459 437413691 661 631
600
568
0.033
0.023 0.017 0.013 0.010 0.008
0.287 0.2260.139 0.0940.0521.48
1.46 0.873 0.540
0.380
.956 1.04 1.19 1.29 1.40
0.819
0.828 0.843 0.867 0.903
8-Pole, 6-Zero
Elliptic, 1.77
Appendix A
High-Pass
Normalized Frequency(f/fc)
A m p (d
B )Frequency Response
0.1
1.0
10.0
2
3456782
34567
-100
-80-60-40-2001.Normalized Group Delay:
The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc).Normalized Delay
(sec)Theoretical Transfer Characteristics 1f/fc (Hz)Amp (dB)Phase (deg)Delay 9.00 10.0 4.00 5.00 6.00 7.00 8.00 1.80 1.90 2.00 2.50 3.00 1.30 1.40 1.50 1.60 1.70 0.90 0.95 1.00 1.10 1.20 0.55 0.60 0.70 0.80 0.85 0.10 0.20 0.30 0.40 0.50
-0.01 0.00 -0.02 -0.01 -0.01-0.01 -0.01 0.02 0.01 0.01 -0.02 -0.02 -0.03 0.01 0.03 0.03 0.03-2.21 -0.51 -0.03 -0.01 -0.05 -90.0-60.2-32.4 -13.1 -6.28-89.3 -82.1 -90.6 -82.4
-87.828.6 25.7 64.7
51.6 42.9 36.8 32.1
150 141 133 105 86.9221 201 185 172 160401358324277225437603563498451
164
148
131
2924500.009 0.007
0.046 0.029 0.020
0.015 0.011 0.260 0.229 0.203 0.123 0.083 0.596 0.486 0.409 0.347 0.2992.66
2.15 1.64 1.04 0.757
0.761
0.890 1.37 2.35 2.77 0.440 0.459 0.495 0.559 0.671