824 Series
1 Hz to 102.4 kHz
8-Bit Programmable
Description
2" x 2"
4-Pole Filters
The 824 Series are digitally programmable low pass
and high pass active filters that are tunable over a
256:1 frequency range. 824 filters are available
with any one of five standard factory-set tuning
ranges up to 102.4 kHz. These units contain 8
CMOS logic inputs .
All 824 Series models are convenient, low profile,
easy to use fully finished filters which require no ex-
ternal components or adjustments. They feature low
harmonic distortion, and near theoretical phase and
amplitude characteristics. 824 filters operate from
non-critical ± 12 to ± 18 Vdc power supplies, have a
10 kW (min.) input impedance, a 10
W
(max.) output.
Features/Benefits:
• Compact 2" x 2" design minimizes board space
requirements.
• Digitally programmable corner frequency allows
selecting cut-off frequencies specific to each appli-
cation.
• Plug-in ready-to-use, reducing engineering de-
sign 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
Programmable Specifications.
. . . . . . . . . . . . .
Page
Digital Tuning & Control . . . . . . . . . . . . . . . . . . . . . . 2
Available Low-Pass Models:
. . . . . . . . . . . . . . . . . . .
824L8B 4-pole Butterworth . . . . . . . . . . . . . . . . . . 3
824L8L
4-pole Bessel . . . . . . . . . . . . . . . . . . . . . . 3
824L8Y2 4-pole Cheby (0.2 dB Ripple) . . . . . . . . . . 3
824L8Y5 4-pole Cheby (0.5 dB Ripple) . . . . . . . . . . 3
Available High-Pass Models:
. . . . . . . . . . . . . . . . . .
824H8B 4-pole Butterworth . . . . . . . . . . . . . . . . . . 4
824H8Y2 4-pole Cheby (0.2 dB Ripple) . . . . . . . . . . 4
824H8Y5 4-pole Cheby (0.5 dB Ripple) . . . . . . . . . . 4
General Specifications:
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin-out/package data. . . . . . . . . . . . . . . . . . . . . . . . . 5
• Anti-alias filtering
• Data acquisition systems
• Communication systems and electronics
• Medical electronics equipment and research
• Aerospace, navigation and sonar applications
• Sound and vibration testing
• Real and compressed time data analysis
• Noise elimination
• Signal reconstruction
25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
824 Series
8-Bit Programmable Filters
Digital Tuning Characteristics
The digital tuning interface circuits are a parallel set of eight (8)
4053 CMOS switches which accept CMOS compatible inputs
for the eight tuning bits (D
0
- D
7
).
Filter tuning follows the tuning equation given below:
f
c
= ( f
max
/256 ) [ 1 + D
7
x 2
7
+ D
6
x 2
6
+ D
5
x 2
5
+ D
4
x 2
4
+ D
3
x 2
3
+ D
2
x 2
2
+ D
1
x 2
1
+ D
0
x 2
0
]
where D
1
- D
7
= "0" or "1", and
f
max
= Maximum tuning frequency;
f
c
= corner frequency;
Minimum tunable frequency = f
max
/256 (D
0
thru D
7
= 0);
Minimum frequency step (Resolution) = f
max
/256
OUT +Vs -Vs
D
7
D
6
D
5
D
4
2.00
GND
D
3
D
2
Digital Tuning &
Control Characteristics
Pin-Out Key
IN
OUT
GND
+Vs
-Vs
Os
Analog Input Signal
Analog Output Signal
Power and Signal Return
Supply Voltage, Positive
Supply Voltage, Negative
Offset Adjustment
D
7
Tuning
D
6
Tuning
D
5
Tuning
D
4
Tuning
D
3
Tuning
D
2
Tuning
D
1
Tuning
D
0
Tuning
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
7 (MSB)
6
5
4
3
2
1
0 (LSB)
Data Input Specifications
Input Data Levels
(CMOS Logic)
4 Vdc max.
15 Vdc max.
-1
mA
max.
.
+1
mA
max.
7.5 pF max.
MSB
2
7
D
7
0
0
0
0
0
0
0
0
1
Input Voltage (Vs = 15 Vdc)
Low Level In
0 Vdc min.
High Level In
11 Vdc min.
Input Current
High Level In
Low Level In
Input Capacitance
Input Data Format
Positive Logic
Bit Weighting
D
0
D
7
Frequency Range
- 10
-5
mA
typ.
+10
-5
mA
typ
.
5 pF typ
D
1
D
0
IN Os
4
Bottom View
---
2
6
D
6
0
0
0
0
0
0
0
1
1
---
2
5
D
5
0
0
0
0
0
0
1
1
1
---
2
4
D
4
0
0
0
0
0
1
1
1
1
---
2
3
D
3
0
0
0
0
1
1
1
1
1
---
2
2
D
2
0
0
0
1
1
1
1
1
1
---
2
1
D
1
0
0
1
1
1
1
1
1
1
LSB
2
0
D
0
0
1
1
1
1
1
1
1
1
Bit
Weight
fc
Corner
Frequency
Frequency Select Bits
Logic "1" = +Vs
Logic "0" = Gnd
(Binary-Coded)
LSB (least significant bit)
MSB (most significant bit)
256 : 1, Binary Weighted
f
max
/256
f
max
/128
f
max
/64
f
max
/32
f
max
/16
f
max
/8
f
max
/4
f
max
/2
fmax
2
25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
824 Series
Specification
(25°C and Vs ± 15 Vdc)
Analog Input Characteristics
1
Impedance
Voltage Range
Max. Safe Voltage
Analog Output Characteristics
Impedance (Closed Loop)
Linear Operating Range
Maximum Current
2
Offset Voltage
3
Offset Temp. Coeff.
Power Supply (
±
V)
Rated Voltage
Operating Range
Maximum Safe Voltage
Quiescent Current
4-Pole
10 k
W
min.
±
10 Vpeak
±
Vs
0.5 0.4
Pin-Out and Package Data
Ordering Information
Pin-Out & Package Data
2.00
G-3
G-1
0.15 min.
0.025 Dia.
11
W
typ.
10
W
max.
±
10V
±
2 mA
22
mV typ.
20 mV max.
50
mV/°C
Side View
All dimensions are in inches
All Case Dimensions ± 0.02"
OUT +Vs -Vs
Grid Dimensions 0.1" x 0.1"
D
7
D
6
D
5
D
4
2.00
GND
D
3
D
2
D
1
D
0
±
15 Vdc
±
12 to
±
18 Vdc
±
18 Vdc
±
13 mA typ.
±
20 mA max.
-20
to +70°C
-25 to +85°C
Temperature
Operating
Storage
Notes:
IN Os
4
Bottom View
Filter Mounting Assembly-See FMA-02A
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.
Ordering Information
Filter Type
L
- Low Pass
H
- High Pass
Transfer Function
B
- Butterworth
L
- Bessel
Y2
- Chebychev
(0.2 dB Ripple)
Y5
- Chebychev
(0.5 dB Ripple)
DC Offset Adjustment
± Vs
Do not connect
if trim is not
required.
20 k
W
(Cermet)
OS
824L8B-3
Model Number
e.g.,
Model
- Vs
Number
2
3
4
5
6
Tuning
Range (Hz)
1.0 to 256
10 to 2560
100 to 25.6k
200 to 51.2k
400 to 102.4k
Minimum
Step(Hz)
1.0
10
100
200
400
Case
G-3
G-1
G-1
G-1
G-1
We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements,
recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements,
recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright.
IN-00824-02
5
25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839
e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com
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