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
1.0 Hz to 102.4 kHz
8-Bit Programmable
D824 Series
2" x 2"
Differential Input
4-Pole Filters
Description
The D824 Series are digitally programmable low
pass and high pass active filters with differential
input that are tunable over a 256:1 frequency range.
D824 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 D824 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. D824 filters operate from
non-critical ± 12 to ± 18 Vdc power supplies, have a
10 k
W (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
· 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
Programmable Specifications
. . . . . . . . . . . . . .
Page
Digital Tuning & Control . . . . . . . . . . . . . . . . . . . . . . 2
Available Low-Pass Models:
. . . . . . . . . . . . . . . . . . .
D824L8B
4-pole Butterworth . . . . . . . . . . . . . . . . . 3
D824L8L
4-pole Bessel . . . . . . . . . . . . . . . . . . . . . 3
D824L8Y2 4-pole Cheby (0.2 dB Ripple) . . . . . . . . . 3
D824L8Y5 4-pole Cheby (0.5 dB Ripple) . . . . . . . . . 3
Available High-Pass Models:
. . . . . . . . . . . . . . . . . .
D824H8B
4-pole Butterworth . . . . . . . . . . . . . . . . . 4
D824H8Y2 4-pole Cheby (0.2 dB Ripple) . . . . . . . . . 4
D824H8Y5 4-pole Cheby (0.5 dB Ripple) . . . . . . . . . 4
General Specifications:
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin-out/package data. . . . . . . . . . . . . . . . . . . . . . . . . 5
8-Bit Programmable Filters
D824 Series
Digital Tuning &
Control Characteristics
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
2
MSB
---
---
---
---
---
---
LSB
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
0
0
0
0
0
0
0
0
f
max
/256
0
0
0
0
0
0
0
1
f
max
/128
0
0
0
0
0
0
1
1
f
max
/64
0
0
0
0
0
1
1
1
f
max
/32
0
0
0
0
1
1
1
1
f
max
/16
0
0
0
1
1
1
1
1
f
max
/8
0
0
1
1
1
1
1
1
f
max
/4
0
1
1
1
1
1
1
1
f
max
/2
1
1
1
1
1
1
1
1
fmax
Bit
Weight
fc
Corner
Frequency
+Vs
OUT
-Vs
D
D
D
D
GND
D
D
D
D
-IN
2.00
Bottom View
Os
4
5
3
2
1
0
6
7
4
+IN
Pin-Out Key
IN
Analog Input Signal
D
7
Tuning Bit 7 (MSB)
OUT Analog Output Signal
D
6
Tuning Bit 6
GND Power and Signal Return
D
5
Tuning Bit 5
+Vs
Supply Voltage, Positive
D
4
Tuning Bit 4
-Vs
Supply Voltage, Negative
D
3
Tuning Bit 3
Os
Offset Adjustment
D
2
Tuning Bit 2
D
1
Tuning Bit 1
D
0
Tuning Bit 0 (LSB)
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
Data Input Specifications
Input Data Levels
(CMOS Logic)
Input Voltage (Vs = 15 Vdc)
Low Level In
0 Vdc min.
4 Vdc max.
High Level In
11 Vdc min.
15 Vdc max.
Input Current
High Level In
- 10
-5
mA typ. -1 mA max.
.
Low Level In
+10
-5
mA typ
.
+1
mA max.
Input Capacitance
5 pF typ
7.5 pF max.
Input Data Format
Frequency Select Bits
Positive Logic
Logic "1" = +Vs
Logic "0" = Gnd
Bit Weighting
(Binary-Coded)
D
0
LSB (least significant bit)
D
7
MSB (most significant bit)
Frequency Range
256 : 1, Binary Weighted
D824 Series
4-Pole
Low-Pass Filters
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
8-Bit Programmable
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
3
Model
D824L8B
D824L8L
D824L8Y2
D824L8Y5
Product Specifications
Transfer Function
4-Pole,
4-Pole,
4-Pole, Chebychev,
4-Pole, Chebychev,
Butterworth
Bessel
0.2 dB Ripple
0.5 dB Ripple
Size, Model 2
2.0" x 2.0" x 0.5"
2.0" x 2.0" x 0.5"
2.0" x 2.0" x 0.5"
2.0" x 2.0" x 0.5"
Model 3 thru 6
2.0" x 2.0" x 0.4"
2.0" x 2.0" x 0.4"
2.0" x 2.0" x 0.4"
2.0" x 2.0" x 0.4"
Range f
c
1.0 Hz to 102.4 kHz
1.0 Hz to 102.4 kHz
1.0 Hz to 102.4 kHz
1.0 Hz to 102.4 kHz
Theoretical Transfer
Appendix A
Appendix A
Appendix A
Appendix A
Characteristics
Page 7
Page 2
Page 12
Page 15
Passband Ripple
0.0 dB
0.0 dB
0.20 dB
0.50 dB
(theoretical)
DC Voltage Gain
0 ± 0.1 dB max.
0 ± 0.1 dB max.
0 ± 0.1 dB max.
0 ± 0.1 dB max.
(non-inverting)
0 ± 0.05 dB typ.
0 ± 0.05 dB typ.
0 ± 0.05 dB typ.
0 ± 0.05 dB typ.
Stopband
Attenuation Rate
24 dB/octave
24 dB/octave
24 dB/octave
24 dB/octave
Cutoff Frequency
f
c
± 2% max.
f
c
± 2% max.
f
c
± 2% max.
f
c
± 2% max.
Stability
± 0.01% /°C
± 0.01% /°C
± 0.01% /°C
± 0.01% /°C
Amplitude
-3 dB
-3 dB
-3 dB
-3 dB
Phase
-180°
-121°
-231°
-245°
Filter Attenuation
0.67 dB 0.80 f
c
1.86 dB 0.80 f
c
-0.20 dB 0.80 f
c
-0.43 dB 0.80 f
c
(theoretical)
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
30.0 dB 2.37 f
c
30.0 dB 3.50 f
c
30.0 dB 1.89 f
c
30.0 dB 1.80 f
c
40.0 dB 3.16 f
c
40.0 dB 4.72 f
c
40.0 dB 2.46 f
c
40.0 dB 2.33 f
c
Phase Match
1
0 - 0.8 f
c
± 2° max.
0 - f
c
± 2° max.
0 - 0.8 f
c
± 2° max.
0 - 0.8 f
c
± 2° max.
± 1° typ.
± 1° typ.
± 1° typ.
± 1° typ.
0.8 fc - 1.0 f
c
± 3° max.
0.8 f
c
- 1.0 f
c
± 3° max.
0.8 f
c
- 1.0 f
c
± 3° max.
± 1.5° typ.
± 1.5° typ.
± 1.5° typ.
Amplitude Accuracy
0 - 0.8 f
c
± 0.2 dB max.
0 - f
c
± 0.2 dB max.
0 - 0.8 f
c
± 0.2 dB max.
0 - 0.8 f
c
± 0.2 dB max.
(theoretical)
± 0.1 dB typ.
± 0.1 dB typ.
± 0.1 dB typ.
± 0.1 dB typ.
0.8 f
c
- 1.0 f
c
± 0.3 dB max.
0.8 f
c
- 1.0 f
c
± 0.3 dB max.
0.8 f
c
- 1.0 f
c
± 0.3 dB max.
± 0.15 dB typ.
± 0.15 dB typ.
± 0.15 dB typ.
Total Harmonic
< - 100 dB typ.
< - 100 dB typ.
< - 88 dB typ.
< - 88 dB typ.
Distortion @ 1 kHz
Wide Band Noise
200
mVrms typ.
200
mVrms typ.
200
mVrms typ.
200
mVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise
50
mVrms typ.
50
mVrms typ.
50
mVrms typ.
50
mVrms typ.
(5 Hz - 100 kHz)
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
8-Bit Programmable
D824 Series
4-Pole
High-Pass Filters
4
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
Model
D824H8B
D824H8Y2
D824H8Y5
Product Specifications
Transfer Function
4-Pole, 4-Pole,Chebychev,
4-Pole,
Chebychev,
Butterworth
0.2 dB Ripple
0.5 dB Ripple
Size, Model 2
2.0" x 2.0" x 0.5"
2.0" x 2.0" x 0.5"
2.0" x 2.0" x 0.5"
Model 3 thru 6
2.0" x 2.0" x 0.4"
2.0" x 2.0" x 0.4"
2.0" x 2.0" x 0.4"
Range f
c
1.0 Hz to 102.4 kHz
1.0 Hz to 102.4 kHz
1.0 Hz to 102.4 kHz
Theoretical Transfer
Appendix A
Appendix A
Appendix A
Characteristics
Page 27
Page 31
Page 33
Passband Ripple
0.0 dB
0.20 dB
0.50 dB
(theoretical)
Voltage Gain
0 ± 0.2 dB to 100 kHz
0 ± 0.2 dB to 100 kHz
0 ± 0.2 dB to 100 kHz
(non-inverting)
0 ± 0.5 dB to 120 kHz
0 ± 0.5 dB to 120 kHz
0 ± 0.5 dB to 120 kHz
Power Bandwidth
120 kHz
120 kHz
120 kHz
Small Signal Bandwidth
(-6 dB) 1 MHz
(-6 dB) 1 MHz
(-6 dB) 1 MHz
Stopband
Attenuation Rate
24 dB/octave
24 dB/octave
24 dB/octave
Cutoff Frequency
f
c
± 2% max.
f
c
± 2% max.
f
c
± 2% max.
Stability
± 0.01% /°C
± 0.01% /°C
± 0.01% /°C
Amplitude
-3 dB
-3 dB
-3 dB
Phase
-180°
-231°
-245°
Filter Attenuation
40 dB 0.31 f
c
40.0 dB 0.41 f
c
40.0 dB 0.43 f
c
(theoretical)
30 dB 0.42 f
c
30.0 dB 0.53 f
c
30.0 dB 0.56 f
c
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
0.02 dB 2.00 f
c
-0.07 dB 2.00 f
c
-0.25 dB 2.00 f
c
Phase Match
1
f
c
- 100 kHz ± 3° max.
f
c
- 100 kHz ± 3° max.
f
c
- 100 kHz ± 3° max.
± 1.5° typ.
± 1.5° typ.
± 1.5° typ.
Amplitude Accuracy
1.0 - 1.25 f
c
± 0.3 dB max.
1.00 - 1.25 f
c
± 0.3 dB max.
1.00 - 1.25 f
c
± 0.3 dB max.
(theoretical)
± 0.15 dB typ.
± 0.15 dB typ.
± 0.15 dB typ.
1.25 f
c
-100 kHz ± 0.2 dB max.
1.25 f
c
-100 kHz ± 0.2 dB max.
1.25 f
c
-100 kHz± 0.2 dB max.
± 0.1 dB typ.
± 0.1 dB typ.
± 0.1 dB typ.
Total Harmonic
< - 100 dB typ.
< - 88 dB typ.
< - 88 dB typ.
Distortion @ 1 kHz
Wide Band Noise
400
mVrms typ.
400
mVrms typ.
400
mVrms typ.
Narrow Band Noise
100
mVrms typ.
100
mVrms typ.
100
mVrms typ.
(5 Hz - 100 kHz)
Specification
(25°C and Vs ± 15 Vdc)
D824 Series
Pin-Out and Package Data
Ordering Information
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-00D824-00
DC Offset Adjustment
± Vs
- Vs
20 k
W
(Cermet)
Do not connect
if trim is not
required.
OS
Analog Input Characteristics
1
Impedance
10 k
W
min.
Voltage Range
±
10 Vpeak
Max. Safe Voltage
±
Vs
Analog Output Characteristics
Impedance (Closed Loop)
1
1
W
typ.
10
W
max.
Linear Operating Range
±
10V
Maximum Current
2
±
2 mA
Offset Voltage
3
2
2 mV typ.
20 mV max.
Offset Temp. Coeff.
50
mV/°C
Power Supply (
±
V)
Rated Voltage
±
15 Vdc
Operating Range
±
12 to
±
18 Vdc
Maximum Safe Voltage
±
18 Vdc
Quiescent Current
4-Pole
±
13 mA typ.
±
20 mA max.
Temperature
Operating
-2
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.
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
Side View
+Vs
OUT
-Vs
D
D
D
D
GND
D
D
D
D
-IN
2.00
0.4
2.00
Bottom View
G-1
0.15 min.
0.025 Dia.
Os
4
5
3
2
1
0
6
7
4
G-3
0.5
+IN
Filter Type
L - Low Pass
H - High Pass
Model Tuning Minimum
Number
Range (Hz)
Step(Hz)
Case
2
1.0 to 256
1.0
G-3
3
10 to 2560
10
G-1
4
100 to 25.6k
100
G-1
5
200 to 51.2k
200
G-1
6
400 to 102.4k
400
G-1
Model Number
e.g.,
D824L8B-3
Transfer Function
B - Butterworth
L - Bessel
Y2 - Chebychev
(0.2 dB Ripple)
Y5 - Chebychev
(0.5 dB Ripple)
Ordering Information
All dimensions are in inches
All Case Dimensions ± 0.02"
Grid Dimensions 0.1" x 0.1"
Filter Mounting Assembly-See FMA-02A
Pin-Out & Package Data
5
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