Filters > R854

R854


1.0 Hz to 102.4 kHz
2" x 4"
4-Pole Filters

Specifications

Pin-out and package data

Ordering Information

Ordering Information


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R854 Series
Two 8-Bit Programmable Ranges
4-Pole Filters
 

 

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Description

The R854 Series are digitally programmable, 4-pole low-pass and highpass active filters that contain a low and a high programmable frequency range, with each range tunable over a 256:1 ratio. R854 filters are available with any two of five standard factory set tuning ranges or 8-bit custom ranges from 1.0 Hz to 102.4 kHz. These units contain 8 CMOS logic inputs that can be operated in a transparent or latching mode and 1 logic input for range selection.

All R854 Series models are convenient, easy to use,fully finished filters which require no external components or adjustments.They feature low harmonic distortion, and precision phase and amplitude characteristics. R854 filters operate from non-critical +/-12 to +/18 VDC power supplies, have a 10 kΩ (min.) input impedance, a 10 Ω (max.) output impedance.

Features/Benefits:

  • 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.
  • Low profile design, ideal for rack mount installations.
Programmable Tuning and Control
Digital Tuning & Control

Available Low-Pass Models:

(Click model number to view datasheet)

R854L4B
4-pole Butterworth
R854L4L
4-pole Bessel
R854L8Y2
4-pole Cheby (0.2 dB Ripple)
R854L8Y5
4-pole Cheby (0.5 dB Ripple)
 

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

Available High-Pass Models:

(Click model number to view datasheet)

R854H8B
4-pole Butterworth
R854H8Y2
4-pole Cheby (0.2 dB Ripple)
R854H8Y5
4-pole Cheby (0.5 dB Ripple)

 


8-Bit Programmable Filters

 

R854 Series

Digital Tuning &
Control Characteristics


Digital Tuning Characteristics

The digital tuning interface circuits are two 4042 quad CMOS latches which accept the following CMOS-compatible inputs: eight tuning bits (D0 - D7 ), a range selection bit (R), a latch strobe bit (C), and a transition polarity bit (P).

Filter tuning follows the tuning equation given below:

fc = ( fmax/256 ) [ 1 + D7 x 27 + D6 x 26 + D5 x 25 + D4 x 24 +
D
3 x 23 + D2 x 22 + D1 x 21 + D0 x 20]

where D1 - D7 = "0" or "1", and
f
max = Maximum tuning frequency;
f
c = corner frequency;
R = 0, Maximum low range
R = 1, Maximum
Minimum tunable frequency = f
max/256 (D0 thru D7 = 0);
Minimum frequency step (Resolution) = f
max/256

MSB
---
---
---
---
---
---
LSB
Bit
Weight
27
D
7
26
D
6
25
D
5
24
D
4
23
D
3
22
D
2
21
D
1
20
D
0
fc
Corner
Frequency
0
0
0
0
0
0
0
0
fmax/256
0
0
0
0
0
0
0
1
fmax/128
0
0
0
0
0
0
1
1
fmax/64
0
0
0
0
0
1
1
1
fmax/32
0
0
0
0
1
1
1
1
fmax/16
0
0
0
1
1
1
1
1
fmax/8
0
0
1
1
1
1
1
1
fmax/4
0
1
1
1
1
1
1
1
fmax/2
1
1
1
1
1
1
1
1
fmax

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 = 0Ý     frequency latched on rising edge
Mode 2   P = 1; C = 1     frequency follows input codes
    P = 1; C = 1ß     frequency latched on falling edge

  Pin-Out Key

IN
Analog Input Signal
 
D7
Tuning Bit 7 (MSB)
OUT
Analog Output Signal
 
D6
Tuning Bit 6
GND
Power and Signal Return
 
D5
Tuning Bit 5
“P”
Transition Polarity Bit
 
D4
Tuning Bit 4
“C”
Tuning Strobe Bit
 
D3
Tuning Bit 3
+Vs
Supply Voltage, Positive
  D2
Tuning Bit 2
-Vs
Supply Voltage, Negative
  D1
Tuning Bit 1
Os
Optional Offset Adjustment
 
D0
Tuning Bit 0 (LSB)
R
Range Switch Adjustment
     

 

 

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 µA typ.   -1 mA max.
 Low Level In   +10-5 µA typ.   +1 µA max.
Input Capacitance   5 pF typ   7.5 pF max.
Latch Response        
 Data Set Up Time1   25nS    
 Data Hold Time2   50 nS    
 Strobe Pulse Width   80 nS min.    

Input Data Format
 
Frequency Select Bits
Positive Logic   Logic "1" = +Vs
    Logic "0" = Gnd
Bit Weighting   (Binary-Coded)
  D0   LSB (least significant bit)
  D7   MSB (most significant bit)
Frequency Range   256 : 1, Binary Weighted

Notes:
1. Frequency data must be present before occurrence of strobe edge.
2. Frequency data must be present after occurrence of strobe edge.


8-Bit Programmable                 4-Pole Low-Pass Filters

Model R854L8B R854L8L R854L8Y2 R854L8Y5
Product Specifications
Transfer Function


Size

Range fc

4-Pole
Butterworth

4.0” x 2.0” x 0.6”

1.0 Hz to 102.4 kHz

4-Pole,
Bessel

4.0” x 2.0” x 0.6””

1.0 Hz to 102.4 kHz

4-Pole, Chebychev,
0.2 dB Ripple

4.0” x 2.0” x 0.6””

1.0 Hz to 102.4 kHz

4-Pole, Chebychev,
0.5 dB Ripple

4.0” x 2.0” x 0.6””

1.0 Hz to 102.4 kHz

Theoretical Transfer
Characteristics
Click to view
Click to view
Click to view
Click to view
Passband Ripple
   (theoretical)
0.0 dB 0.0 dB 0.2 dB 0.5 dB
DC Voltage Gain
   
(non-inverting)
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
Stopband
Attenuation Rate
24 dB/octave 24 dB/octave 24 dB/octave 24 dB/octave
Cutoff Frequency
Stability
Amplitude
Phase
fc          ± 2% max.
± 0.01% /°c
- 3 dB
-180°
fc          ± 2% max.
± 0.01% /°c
- 3 dB
-121°
fc          ± 2% max.
± 0.01% /°c
- 3 dB
-231°
fc          ± 2% max.
± 0.01% /°c
- 3 dB
-245°
Filter Attenuation
   
(theoretical)
0.67 dB       0.80 fc
3.01 dB       1.00 fc
30.0 dB       2.37 fc
40.0 dB       3.16 fc
1.86 dB       0.80 fc
3.01 dB       1.00 fc
30.0 dB       3.50 fc
40.0 dB       4.72 fc
- 0.20 dB     0.80 fc
3.01 dB       1.00 fc
30.0 dB       1.89 fc
40.0 dB       2.46 fc
- 0.43 dB     0.80 fc
3.01 dB       1.00 fc
30.0 dB       1.80 fc
40.0 dB       2.33 fc
Phase Match1
0 - 0.8 fc
± 2° max.
± 1° typ.
0.8 fc - 1.0 fc
± 3° max.
± 1.5° typ.
0 - fc
± 2° max.
± 1° typ.
 
0 - 0.8 fc
± 2° max.
± 1° typ.
0.8 fc - 1.0 fc
± 3° max.
± 1.5° typ.
0 - 0.8 fc
± 2° max.
± 1° typ.
0.8 fc - 1.0 fc
± 3° max.
± 1.5° typ.
Amplitude Accuracy
   
(theoretical)
0 - 0.8 fc
± 0.2 dB max.
± 0.1 dB typ.
0.8 fc - 1.0 fc
± 0.3 dB max.
± 0.15 dB typ.
0 - fc
± 0.2 dB max.
± 0.1 dB typ.
0 - 0.8 fc
± 0.2 dB max.
± 0.1 dB typ.
0.8 fc - 1.0 fc
± 0.3 dB max.
± 0.15 dB typ.
0 - 0.8 fc
± 0.2 dB max.
± 0.1 dB typ.
0.8 fc - 1.0 fc
± 0.3 dB max.
± 0.15 dB typ.
Total Harmonic
Distortion @ 1 kHz
< - 100 dB typ. < - 100 dB typ. < - 88 dB typ. < - 88 dB typ.
Wide Band Noise
   
(5 Hz - 2 MHz)
200 µVrms typ. 200 µVrms typ. 200 µVrms typ. 200 µVrms typ.
Narrow Band Noise
(5 Hz - 100 kHz)
50 µVrms typ. 50 µVrms typ. 50 µVrms typ. 50 µVrms typ.
Filter Mounting
Assembly
FMA-03A FMA-03A FMA-03A FMA-03A
 

1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.


8-Bit Programmable                 4-Pole High-Pass Filters

Model R854H8B R854H8Y2 R854H8Y5
Product Specifications
Transfer Function


Size

Range fc, fr

4-Pole
Butterworth

4.0” x 2.0” x 0.6”

1.0 Hz to 102.4 kHz

4-Pole, Chebychev,
0.2 dB Ripple

4.0” x 2.0” x 0.6”

1.0 Hz to 102.4 kHz

4-Pole, Chebychev,
0.5 dB Ripple

4.0” x 2.0” x 0.6”

1.0 Hz to 102.4 kHz

Theoretical Transfer
Characteristics
Click to view
Click to view
Click to view
Passband Ripple
   (theoretical)
0.0 dB 0.2 dB 0.50 dB
Voltage Gain
   
(non-inverting)
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz
0 ± 0.2 dB to 100 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
Stability
Amplitude
Phase
fc          ± 2% max.
± 0.01% /°c
- 3 dB
180°
fc          ± 2% max.
± 0.01% /°c
- 3 dB
231°
fc          ± 2% max.
± 0.01% /°c
- 3 dB
245°
Filter Attenuation
   
(theoretical)
40 dB          0.31 fc
30.0 dB       0.42 fc
3.01 dB       1.00 fc
0.02 dB       2.00 fc
40.0 dB       0.41 fc
30.0 dB       0.53 fc
3.01 dB       1.00 fc
-0.07 dB      2.00 fc
40.0 dB       0.43 fc
30.0 dB       0.56 fc
3.01 dB       1.00 fc
-0.25 dB      2.00 fc
Phase Match1
fc - 100 kHz
± 3° max.
± 1.5° typ.
fc - 100 kHz
± 3° max.
± 1.5° typ.
fc - 100 kHz
± 3° max.
± 1.5° typ.
Amplitude Accuracy
   
(theoretical)
1.00 - 1.25 fc
± 0.3 dB max.
± 0.15 dB typ.
1.25 fc - 100kHz
± 0.2 dB max.
± 0.1 dB typ.
1.00 - 1.25 fc
± 0.3 dB max.
± 0.15 dB typ.
1.25 fc - 100kHz
± 0.2 dB max.
± 0.1 dB typ.
1.00 - 1.25 fc
± 0.3 dB max.
± 0.15 dB typ.
1.25 fc - 100kHz
± 0.2 dB max.
± 0.1 dB typ.
Total Harmonic
Distortion @ 1 kHz
< - 100 dB typ. < - 88 dB typ. < - 88 dB typ.
Wide Band Noise 400 µVrms typ. 400 µVrms typ. 400 µVrms typ.
Narrow Band Noise
(5 Hz - 100 kHz)
100 µVrms typ. 100 µVrms typ. 100 µVrms typ.
Filter Mounting
Assembly
FMA-03A FMA-03A FMA-03A
 

1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.


Specifications

(@ 25°C and Vs ±15 Vdc)

Analog Input Characteristics1
  • Impedance: 10 kΩ min.
  • Voltage Range: ± 10 Vpeak
  • Max. Safe Voltage: ± Vs

Analog Output Characteristics

  • Impedance(Closed Loop):
    1 Ω typ.
    10 Ω max.
  • Linear Operating Range: ± 10 V
  • Maximum Current2: ± 2 mA
  • Offset Voltage3:
    2 mV typ.

    20 mV max.
  • Offset Temp. Coeff.: 50 µV / °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.
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: 0 to + 70°C
  • Storage: -25 to+85°C


Pin-Out and Package Data


Ordering Information


Power Sequence & ESD
Programmable Filters Modules

818, 824, 828, 828BP, 828BR, 854, 858, R854, R858, 824BP, D824, D828

  1. Scope
    The following precautions are necessary when handling and installing Frequency Devices programmable filter modules.

  2. Digital Circuit Description
    The digital input pins connect directly to 4000 series CMOS logic, such as the 4053 analog switch. The power supply (Vss) for the digital logic on the module comes directly from the +15 Volt pin on the module. This sets the threshold voltage at 11.0 V minimum to 15.0 V maximum for a "1" (High) level and 0.0 V minimum to 4.0 V maximum for a "0" (Low) level. Applying a voltage between 4.0 and 11.0 V will produce unpredictable operation. Connecting 5 Volt or 3.3 V logic devices directly to the filter module without using a voltage translator will result in erratic operation of the filter.

  3. (VERY IMPORTANT) Power-Up and Power-Down Sequence
    Do not plug-in or un-plug module while power is applied. It is imperative that power is supplied to the + 15 V pin on the filter module before or at the same instance that any digital pin is pulled High (> 0.0 V). Failure to do this will result in excessive current flowing through the digital input pin and through a protection diode internal to the 4000 logic, which will result in damage to the module. The proper power-up and power-down sequence is:
    1. Connect filter module ground.
    2. Connect filter module +15 V.
    3. Connect filter module -15 V.
    4. Connect the input signal.


    All four of the above steps can also occur simultaneously. Power-down should occur in the reverse order.

  4. ESD Issues
    Like most modern electronic equipment, the modules can be damaged by electrostatic discharge (ESD). The modules are shipped from the factory in sealed, anti-static packaging and should be kept in the sealed package prior to mounting on a circuit board. The following additional rules should also be observed when handling the modules after they are removed from the factory packaging:
    1. Only a person wearing a properly grounded wrist strap should handle the modules.
    2. Any work surface that the modules are placed on must be properly ESD grounded.
    3. Any insulating materials capable of generating static charge (such as paper) should be kept away from the modules.


    Static generating clothing should be covered with an ESD-protective smock.


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.


Frequency Devices, Inc.
Your engineering partner for signal conditioning
  1784 Chessie Lane
Ottawa, IL 61350

Fax: (815) 434-8176
e-mail: sales@freqdev.com

 

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or (800) 252-7074 (U.S. only)

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