Model ASC-50
Frequency Devices’ ASC-50, is a laboratory bench-top
programmable instrument that combines familiar
analog signal input and output with the power and
flexibility of DSP. The ASC-50 provides the user with
finger-tip control of filter type, (low-pass, high-pass,
band-pass, and band-reject), operating frequency,
pole/bandwidth configuration, pre and post gain
settings, and analog/DSP filter functions - including
many not available through conventional analog
techniques. All are accessible at the touch of a button.
With a frequency range from 0.1Hz to 30kHz
combined with amplitude response of Butterworth,
Chebychev, elliptic and finite-impulse-response (FIR)
filter functions, the ASC-50 offers wide tuning flexibility
without the need for pre-defined programming.
An analog instrumentation interface provides input
gain; DC offset control and variable output gain along
with selectable single-ended and differential inputs to
accommodate a variety of driving signals. Additionally,
input DC-offset control is provided with expanded
resolution. With the exception of filter and frequency
changes all parameters of the ASC-50 can be altered
on the fly without halting signal flow. Real-time bypass
and gain-control facilitate test comparisons with and
without the filter activated.
A four button touch-pad coupled with a liquid-crystal
display (LCD) affords the user complete control of
various signal conditioning functions. Through the
LCD, the operator is prompted by a selection of
several filter types, functions, frequency and gain
settings. Less than optimum selections are indicated,
providing guidance without regimentation. Saturation
(over-range) conditions are indicated on both the input
and output permitting ease of system setup and use.
• Wide variety of filter types, functions and
• Precise, stable filter performance
• Adjustable gain and attenuation
• DC offset control
• Choice of single or differential inputs
• Special DSP bypass
• Analog and DSP clip indicators
• Filter performance display
Over 200 LP, HP, BP, BR
Analog & DSP Filters Options
Mode 1
Field 1
Filter type
Field 2
Filter function
Field 3
Number of poles or pole-pairs
Field 4
Field 5
Field 6
Corner frequency
Mode 2
Field 1
Pre-gain control
Field 2
Post/gain control
Mode 3
Field 1
Single/Differential control
Field 2
Input DC offset control
Mode 4
Field 1
Shape factor/Transition band
Field 2
Stop-band bandwidth
25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839
e-mail: [email protected] • Web Address:
Model ASC-50
Filter/Amplifier Instrument
Filter Types
• Low-pass
• High-pass
• Band-pass
• Band-reject
Filter Functions
• Butterworth
• Chebyshev
• Elliptic-60dB
• Elliptic-80dB
• FIR-40dB
• FIR-60dB
• FIR-80dB
Available Low-Pass, High-Pass Transfer Functions
• Butterworth 4,6,8,10 Pole
• Chebychev (0.1dB Ripple)
4,6,8,10 Pole
• Elliptic-60 dB (0.1dB Ripple)
4,6,8,10 Pole
• Elliptic-80 dB (0.1dB Ripple)
4,6,8,10 Pole
• FIR-40 dB
• FIR-60 dB
• FIR-80 dB
Available Band-Pass, Band-Reject Transfer Functions
• Butterworth
3,4 Pole-Pair
Q = 2,5,10,20
• Chebychev
3,4 Pole-Pair
Q = 2,5,10,20
(0.1dB Ripple)
• Elliptic-60 dB
3,4 Pole-Pair
Q = 2,5,10,20
(0.1dB Ripple)
• Elliptic-80 dB
3,4 Pole-Pair
Q = 2,5,10,20
(0.1dB Ripple)
Gain Control
• PRE - Analog pre-gain range 0 to +36dB in 6dB steps
• POST - Digital post-gain range -48dB to +42dB in
• 6dB steps.
DC Offset Control
• Input DC offset range ±5 Volts
• FIR-40 dB
• FIR-60 dB
• FIR-80 dB
Over-Range Indication
• Analog saturation, clipping detection ( CLIP)
• Digital saturation, clipping detection (CLIP )
(@ 25° °C and Rated Power Input)
Input Characteristics
Input Configuration
Analog Clipping Indicator Threshold
DC Offset
Analog Pre-Gain Range
1MΩ || 47pF to analog ground (each input)
Single Ended or Differential
±5V DC
0 to +36 dB (6 dB steps)
>60 dB @ 1 kHz
Output Characteristics
Output Configuration
Digital Clipping Indicator Threshold
Digital Post-Gain Range
<1 Ω
Single ended
±Full scale (Digital to analog converter)
-48 dB to +42 dB (6 dB steps)
Linear Signal Level
Safe Signal Level
Total Harmonic Distortion
±10V Peak (7.07Vrms) max.
±60V Peak max.
-70 dBV typ. @ 7.07Vrms 1 kHz (Bypass condition 30 kHz BW)
-90 dBV typ. input grounded (Bypass condition 30 kHz BW)
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.
25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839
e-mail: [email protected] • Web Address: