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
0.1 Hz to 102.4 kHz
8-Bit Programmable
858 Series
2" x 4"
8-Pole Filters
Description
The 858 Series are digitally programmable low pass
and high-pass active filters that are tunable over a
256:1 frequency range. 858 filters are available
with any one of six standard factory-set tuning
ranges up to 102.4 kHz. These units contain 8
CMOS logic inputs that can be operated in a
transparent or latching mode.
All 858 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 phase
and amplitude characteristics. 858 filters operate
from non-critical 12 to 18 Vdc power supplies,
have a 10 k
W (min.) input impedance, a 10 W (max.)
output impedance and offer dc voltage offset
adjustment.
Features/Benefits:
Lower cost, high precision replacement for 848
and 878 series products.
Low harmonic distortion and wide signal-to-noise
ratio to 16 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 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:
. . . . . . . . . . . . . . . . . . .
858
L8B
8-pole Butterworth . . . . . . . . . . . . . . . . . 3
858
L8E
8-pole, 6 zero elliptic, 1.77 (-80dB) . . . . . 3
858
L8EX 8-pole, 6 zero elliptic, 1.56 (-80dB) . . . . . 3
858
L8EY 8-pole, 6 zero elliptic, 2.00 (-100dB) . . . . 3
858
L8L
8-pole Bessel . . . . . . . . . . . . . . . . . . . . . 4
858
L8D60 8-pole constant delay (-60dB). . . . . . . . . 4
858
L8D80 8-pole constant delay (-80dB). . . . . . . . . 4
858
L8D10 8-pole constant delay (-100dB) . . . . . . . . 4
Available High-Pass Models:
. . . . . . . . . . . . . . . . . .
858
H8B
8-pole Butterworth . . . . . . . . . . . . . . . . . . 5
858
H8E
8-pole, 6 zero elliptic, 1.77 (-80dB) . . . . . 5
858
H8EX 8-pole, 6 zero elliptic, 1.56 (-80dB) . . . . . 5
858H8EY
8-pole, 6 zero elliptic, 2.00 (-100dB) . . . . 5
General Specifications:
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin-out/package data . . . . . . . . . . . . . . . . . . . . . . . . 6
8-Bit Programmable Filters
858 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
Digital Tuning Characteristics
The digital tuning interface circuits are two 4042 quad CMOS
latches which accept the following CMOS-compatible inputs:
eight tuning bits (D
0
- D
7
), a latch strobe bit (C), and a transition
polarity bit (P).
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
Data Control Lines
Functions
Latch Strobe (C)
Transition Polarity (P)
Data Control Modes
Mode 1
P = 0; C = 0
frequency follows input codes
P = 0; C = 0
>
frequency latched on rising edge
Mode 2
P = 1; C = 1
frequency follows input codes
P = 1; C = 1
fl
frequency latched on falling edge
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
MSB
---
---
---
---
---
---
LSB
Bit
Weight
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
fc
Corner
Frequency
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
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
"P"
Transition Polarity Bit
D
4
Tuning Bit 4
"C"
Tuning Strobe Bit
D
3
Tuning Bit 3
+Vs
Supply Voltage, Positive
D
2
Tuning Bit 2
-Vs
Supply Voltage, Negative
D
1
Tuning Bit 1
Os
Offset Adjustment
D
0
Tuning Bit 0 (LSB)
Notes:
1. Frequency data must be present before occurrence of strobe edge.
2. Frequency data must be present after occurrence of strobe edge.
+Vs
OUT
-Vs
D
D
D
D
GND
D
D
D
D
C
P
IN
Bottom View
Os
4
5
3
2
1
0
6
7
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