PROGRAMMABLE FREQUENCY MODULE
AD Series - Module Filters

Digitally Programmable Filters

Our easy to use AD Series filter modules need no external components. Cut-off frequency can be precisely selected via TTL/CMOS digital inputs. Units operate up to 1 MHz with resolution up to 16 Bits. The outstanding feature of low
DC shift between settings is ideal for automation and multi-channel data acquisition.

Model AD2/AD3 Typical package outline shown on page 7, AD8/AD10 shown opposite

Features and Selection Tables

Model AD2

Miniature 2 BIT, 4 SETTINGS Features

  • 2 BIT CMOS, TTL compatible
  • Independent or binary weighed
  • 4th or 8th orders
  •  

Binary Bit

Selection Schemes

2 1 A B C D
0 0 0F0 0F0 0F0 F0
0 1 2F0 2F0 2F0 F1
1 0 4F0 F1 3F0 F2
1 1 8F0 2F1 4F0 F3

Model AD3

3 BIT, 8 SETTINGS Features

  • 3 BIT CMOS, TTL compatible
  • 8 independent frequency settings
  • Butterworth, Bessel, Chebyshev, Elliptic, & Linear Elliptic

Binary Bit Selection Schemes

Binary Bit

Selection Schemes

3 2 1 A B C D
0 0 0 F0 F0 F0 F0
0 0 1 2F0 2F0 2F0 F1
0 1 0 4F0 F1 3F0 F2
0 1 1 8F0 2F1 4F0 F3
1 0 0 16F0 F2 5F0 F4
1 0 1 32F0 2F2 6F0 F5
1 1 0 64F0 F3 7F0 F6
1 1 1 128F0 2F3 8F0 F7

Model AD8

8 BIT, 255 CONTINUOS STEPS w/Memory Features

  • uP compatible
  • 255 continuous steps
  • Instantaneous selection
  • Customer specified frequency
  • Latching available for memory

Fmax (Hz) Step size (Hz) Fmin (Hz)
1,020.0 k 4,000.0 4,000.0
510.0 k 2,000.0 2,000.0
255.0 k 1,000.0 1,000.0
102.0 k 400.0 400.0
51.0 k 200.0 200.0
25.5 k 100.0 100.0
12.7 k 50.0 50.0
10.2 k 40.0 40.0
5.1 k 20.0 20.0
2,550.0 10.0 10.0
1,275.0 5.0 5.0
1,020.0 4.0 4.0
510.0 2.0 2.0
255.0 1.0 1.0
25.5 0.1 0.1

Model AD10

10 BIT, 1023 STEPS DIP Switch Input Features

  • 10 BIT Built-In DIP Switch
  • No external binary bus needed
  • No latching required
  • Frequency set by internal DIP switch
  • Support all filter functions
  • Implement most filter responses

Fmax (Hz) Step size (Hz) Fmin (Hz)
102.4 k 100.0 100.0
51.2 k 50.0 50.0
20.5 k 20.0 20.0
10.2 k 10.0 10.0
5,120.0 5.0 5.0
2,050.0 2.0 2.0
1,024.0 1.0 1.0
102.4 0.1 0.1

Case Style & Outline Dimensions

 
MODEL AD10 DIP SWITCH POSITION*
1 2 3 4 5 6 7 8 9 10 Frequency
1 0 0 0 0 0 0 0 0 0 512
0 1 0 0 0 0 0 0 0 0 255
0 0 1 0 0 0 0 0 0 0 128
0 0 0 1 0 0 0 0 0 0 64
0 0 0 0 1 0 0 0 0 0 32
0 0 0 0 0 1 0 0 0 0 16
0 0 0 0 0 0 1 0 0 0 8
0 0 0 0 0 0 0 1 0 0 4
0 0 0 0 0 0 0 0 1 0 2
0 0 0 0 0 0 0 0 0 1 1

 

 

*TOP VIEW (white dot on pin 1)
Shown for AD10 model only

PIN ASSIGNMENT

Pin No. Model: AD3 Model: AD8 Model: AD10
1 N/C* Filter Input Filter Input
2 N/C +15V Ground
3 N/C -15V V+
4 Ground Ground Bit 9 (MSB)
5 Filter Input Bit 7 (MSB) Bit 8
6 Bit 1 Bit 6 Bit 7
7 Bit 2 Bit 5 Bit 6
8 Bit 3 Bit 4 Bit 5

Pin No. Model: AD3 Model: AD8 Model: AD10
09 +15V Bit 3 Bit 4
10 -15V Bit 2 Bit 3
11 Ground Bit 1 Bit 2
12 N/C Bit 0 (LSB) Bit 1
13 DC Adjust Ground Bit 0 (LSB)
14 Filter Output DC Adjust V-
15 N/C WR DC Adjust
16 N/C Filter Output Filter Output

*N/C: No Connection

Specifications

ELECTRICAL CHARACTERISTICS

(Supply = ±15V., Load = 10 k, Temp. = 25°C)

Parameters AD2 AD3 AD8 AD10
Filter Type Analog RC Analog RC Analog RC Analog RC
No. of BITS 2 3 8 10
Frequency Settings 4 8 255 1023
Control Format Binary Binary Binary Built-In DIP Switch
Logic CMOS, CMOS, CMOS, CMOS,
TTL compatible TTL compatible TTL compatible TTL compatible
Supply Voltage ± 15 V. ± 15 V. ± 15 V. ± 15 V.
Supply Current 20 mA/4 pole 20 mA/4 pole 30 mA/4 pole 30 mA/4 pole
Input Impedance > 500 kohm > 500 kohm > 20 kohm > 20 kohm
Output Impedance(DC) < 1.0 ohm < 1.0 ohm < 1.0 ohm < 1.0 ohm
Maximum Input Voltage ± 12 V. ± 12 V. ± 12 V. ± 12 V.
Output Swing(2k load) ± 12 V. ± 12 V. ± 12 V. ± 12 V.
DC offset < 2 mV < 2 mV < 2 mV < 2 mV
Offset Among Settings < 0.5 mV < 0.5 mV < 10.0 mV < 10.0 mV
External Adjustable yes yes yes yes
Filter Function1 L,H,B,N L,H,B,N L,H,B,N L,H,B,N
Filter Function2 B,L,C B,L,C B,L,C,E,Z B,L,C,E,Z
Filter Order 4, 8 4,6,8,10 4,6,8 4,6,8,10
Passband Output 0, or w/ gain 0, or w/ gain 0, or w/ gain Programmable
Dimension 2.5"x0.8"x0.4" 3.25"x1.1"x0.45" 3.5"x1.1"x0.45" 3.25"x2.5"x0.5"
Pin Diameter 0.025" 0.025" 0.025" 0.025"
Case Material Thermoplastic Thermoplastic Thermoplastic Black Epoxy
* NOTES:
1 L = Lowpass, H = Highpass, B = Bandpass, N = Band-reject
2 B = Butterworth, L = Bessel, C = Chebyshev, E = Elliptic, Z = Linear Elliptic

OPTIONS
Suffix Description
L ­ Low power consumption (20mA)
I ­ Industrial temp. range (-25° C to 85° C)
M ­ Military temp. range (-55° C to 125° C)
A1 ­ 10x amplification
 

 A2 ­

100x amplification
 

 A3 ­

1000x amplification
 

 D ­

Differential Input

 

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Avens Signal Equipment Corp
P.O. Box 518 Plumsteadville, PA 18949
800-394-5407
Tel: 215-766-8775 Fax: 215-348-9213
info@avens-filter.com www.avens-filter.com