D83S Series
-12 dB to +60 dB Programmable Amplifier
Description
The D83S Series programmable amplifiers are digitally
controlled gain modules that were designed for condition-
ing DC-coupled wide-band signals (AC coupled-optional).
They are programmable from -12 dB to +60 dB in 6 dB
steps with an 8-bit serial data stream for gain selection
using clock, data and strobe inputs.
Other standard performance features include differential
input, single ended output, 5V interface logic, and low
noise and distortion, making this plug-in ready-to-use
amplifier ideal for many signal conditioning applications.
Available options include AC coupled input and/or differ-
ential output.
Features/Benefits:
· Full power bandwidth to 100 kHz for wide dynamic
range applications
· Compact 1.8" x 0.8" x 0.3" (32 pin DIP) size minimizes
board space requirements U.S. Selling Price (1-9) $240.00 each
· Serial interface and software protocol allowing Orders for Export U.S. Selling Price + 20%
operation on a simple three wire bus. Minimum Order Value $150.00 F.O.B. Haverhill, MA
· Data out line allows data verification and cascading of Lead-Time: 3-4 weeks A.R.O Accept Visa, Mcard, Amex
multiple amplifiers over the same serial interface.
· Plug-in ready-to-use, reducing engineering design and
manufacturing time. Common Mode Rejection Ratio
+0
Applications -10
-20
· Data acquisition
-30
· Test equipment
-40
· Remote instrumentation systems d
B -50
· Ground loop elimination in remote measurements g
-60
· Improvements in system dynamic range and resolution -70
· Telemetry -80
-90
· Process control
-100
· Digitally controlled auto ranging systems 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k
Hz
· Medical, Scientific & engineering research
Frequency Response Total Harmonic Distortion + Noise
+80
+0
+70 -10
+60 -20
+50 -30
-40
+40
d -50
B +30 -60
g d
+20 B -70
g
-80
+10
-90
+0
-100
-10 -110
-20 -120
20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k 20 50 100 200 500 1k 2k 5k 10k
Hz
Hz
25 Locust St, Haverhill, Massachusetts 01830 · Tel: 800/252-7074, 978/374-0761 · FAX: 978/521-1839
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
e-mail: sales@freqdev.com · Web Address: http://www.freqdev.com
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D83S Series
Gain Amplifier Digital Programming & Control
The D83S programs via a three terminal serial data interface over a gain range from 0.25 (~-12dB) to
1024 (~+60dB) using Clock (C), Strobe (S) and Data inputs (Di). A Data out (Do) connection is provided
to permit cascading of multiple D83S's or "looping" of the input data to verify the programmed setting.
Two stages of programmable gain/attenuation are used to optimize the D-C offset and gain bandwidth
performance. The gain programming equation is:
G=[1+3xD0+12xD1+48xD2+64xD3]x[1/4+(1/4)xD4+(1/2)xD5+D6]x[1+3xD7]
where D0 - D7 = "0" or "1" Note: the use of the compliments of D0, D1, D2 and D3.
C, S and Di Input Specifications
Input Data Levels (Cmos/TTL Logic)
Input Voltage (Vd = 5Vdc)
Low Level In 0 Vdc min., 1.5 Vdc max.
High Level In 3.5 Vdc min., 5.0 Vdc max.
Input Current
Low Level In -10-5 µA typ., -1 µA max.
High Level In +10-5 µA typ., +1 µA max.
Input Capacitance 5 pF typ., 7.5 pF max.
Recommended Programming Table
All combinations of programming inputs produce valid gain settings as determined by the gain equation
but can result in unusual values of gain. To minimize the multiplication of D-C offset and to maximize the
bandwidth at high gains the following is the recommended programming format for binary weighted gains
from 1/4 (~-12dB) to 1024 (~60dB).
Gain ( V/V ) Gain (~dB) D0 D1 D2 D3 D4 D5 D6 D7
1/4 -12.04 1 1 1 1 0 0 0 0
1/2 -6.02 1 1 1 1 1 0 0 0
1 0.00 1 1 1 1 1 1 0 0
2 +6.02 1 1 1 1 1 1 1 0
4 +12.04 0 1 1 1 1 1 0 0
8 +18.06 0 1 1 1 1 1 1 0
16 +24.08 0 0 1 1 1 1 0 0
32 +30.10 0 0 1 1 1 1 1 0
64 +36.12 0 0 0 1 1 1 0 0
128 +42.14 0 0 0 0 1 1 0 0
256 +48.16 0 0 0 0 1 1 1 0
512 +54.19 0 0 0 0 1 1 0 1
1024 +60.21 0 0 0 0 1 1 1 1
Programming Sequence The programming input circuit is a CD4094 series 8 bit shift register with
latches. It requires an 8 bit input serial data stream, Di (D0 to D7), a clock C to shift and a strobe S to
latch the data (see note 1). A timing sequence must be observed to insure accurate shifting and latching
of the input data. The input data bits, D0 through D7 are entered in reverse order, i.e. the MSB, D7, is the
first bit to be entered followed by D6 etc. and ending with the LSB, D0 (refer to timing diagram).
2
25 Locust St, Haverhill, Massachusetts 01830 · Tel: 800/252-7074, 85716 Unterschleissheim
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 978/374-0761 · FAX: 978/521-1839
e-mail: sales@freqdev.com · Web Address: http://www.freqdev.com
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D83S Series
Gain Amplifier Digital Programming & Control
The Clock shifts the input data Di through the shift registers when it transitions from low to high. For the
input data to be accurately received, it must have been present for at least Ts at the time of the rising
clock transition. The maximum clock pulse frequency is 1.25MHz.
Data from the shift registers propagates through the latches when the strobe is high. Data is latched
when the Strobe transitions from high to low. To retain a programmed setting it is necessary to hold the
strobe low (or to shut off the clock). Keeping the strobe low will allow the clock to shift a new set of input
data into the registers without changing the latched setting.
To latch a new set of data the strobe must be set to its high state, after the last bit of the new input word
(D0) has been shifted in (>Tcs), held high for a minimum time of Tsw and then returned to its low state to
latch and hold the setting. The return of S to its low state must occur before the rise of the clock that
accepts the D7 of the next data word (Tsc>0).
Timing Diagram
Ts Tcw
Clock
Th > 5ns
D7 D6 D0 D7
Data Valid Input Valid Input Valid Input Valid Input
Tcs Tsc
Strobe
Tsw
=Don't care
Notes:
1.) Data is shifted into register on positive edge of clock.
2.) Data is latched on negative edge of strobe.
3.) Ts is set up time (valid data before clock).
4.) Tcs is time between D0 clock and start of strobe.
5.) Tsw is strobe width.
6.) Tsc is time between strobe end and D7 clock (next word).
7.) Tcw is clock width.
8.) Th is hold time (Valid data after clock rising edge).
Minimum Setup Times
Ts >125nS Time data must be present before rise of clock pulse.
Tcs >260nS Time from rise of Clock for last data bit, D0, to rise of Strobe pulse.
Tsw >200nS Strobe width.
Tsc >0nS Time from fall of Strobe to rise of next Clock pulse.
Tcw >200nS Clock pulse width.
Cf 1.25 MHz Maximum Clock pulse frequency.
Th >5nS Time data must be valid after rise of clock pulse.
Caution!!
Note 1: The C, P and Di inputs are Tri-state C-MOS logic. They contain protection circuitry to guard against damage due to high static voltages or
electric fields, however the application of any voltages higher than the +5V or lower than the 0V supply voltages can cause permanent damage.
These inputs must always be connected to an appropriate logic voltage level. Permanent damage can also result if C, P and Di are allowed to float
unconnected. If the D83S is used in a configuration where these inputs can become disconnected from their drive circuits, or if their drive circuits
are not powered by the same +5V source, it is recommended to use 10k pull up resistors to +5V on these inputs.
3
25 Locust St, Haverhill, Massachusetts 01830 · Tel: 800/252-7074, 978/374-0761 · FAX: 978/521-1839
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
e-mail: sales@freqdev.com · Web Address: http://www.freqdev.com
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
D83S Series
Specification Pin-Out and Package Data
(25°C and Vs ± 15 Vdc) Ordering Information
Analog Input Characteristics 1.80
Configuration DC coupled, differential Input Side View 0.30
AC Coupled (Optional) Fixed @ 10 Hz
0.15 (min)
Impedance 1 M 22pF
Bias Current 20 pA max. 0.025 dia.
Offset Current 10 pA max.
Voltage Range ±10 Vpeak (note)
-IN +IN +OUT NC/-OUT
Max. Safe Voltage ±Vs
Common Mode Rejection Ratio Typ. 80 dB @ 1 kHz
Min. 60 dB @ 1 kHz
Bottom View 0.80
Noise Voltage Density, RTI 20 nV/ Hz @ 1 kHz, G=1,024
Analog Output Characteristics
Configuration Single ended, DC coupled +5V S Di C Do +Vs GND -Vs
Differential Output (Optional)
Impedance <1 typ., 10 max.
Current (linear operation) ±5 mA max. S STROBE ALL DIMENSIONS ARE IN INCHES
Offset Voltage 2 mV RTI, NTE 40 mV max. C CLOCK ALL CASE DIMENSIONS ± 0.01"
DI DATA IN GRID DIMENSIONS
Offset Temp. Coeff. ±(5 + 100/G) µV/°C DO DATA OUT 0.10" X 0.10"
General Analog Characteristics Note: NC pin is used as "-OUT" for differential output option
Gain (programmable) 0.25X to 1,024X in factors of 2
Gain Tolerance ±0.10 dB
Distortion (0 dB gain @ 3.5 Vrms) -86 dB @ 1 kHz typ.
Full Power Bandwidth (0 dB gain) 100 kHz
Power Supplies (±Vs), +Vd
Rated Voltage ±15 Vdc, +5 Vdc
Functional Schematic
Operating Range ±5 to ±18 Vdc, 5 ± 0.5 Vdc
Maximum Safe Voltage ±18 Vdc, +5.5 Vdc +IN Programmable Programmable +OUT
Instrumentation
Quiescent Current -IN Amplifier
Gain Stage
±15 V ±12 mA Inverting
-OUT
+5 V +0.2 mA Amplifier
C
Temperature Di
4094 Series 8 Bit
Shift Register
Do
S
Operating 0 to +70°C
Storage -25 to +85°C
Ordering Information
D83S-D
Options
A - AC Coupled Input
D - Differential Output
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. PR-00D83S-01
4
25 Locust St, Haverhill, Massachusetts 01830 · Tel: 800/252-7074, 978/374-0761 · FAX: 978/521-1839
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
e-mail: sales@freqdev.com · Web Address: http://www.freqdev.com
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de