WEIGHING TECHNOLOGY

Keywords:  Loadcell, strain gauge, amplifier, digital filter, microcontroller, excitation, retail scale, bench scale, conveyor scale, batching & filling systems, dosing, silo weighing, EN45501, OIML, calibration, counting scale

Weighing Companies (Manufacturers) in Turkey:

Products/Market Positions (Last Update 21 December 2001)

  Retail Scale Bench Scale Truck Scale Counting Scale Filling Automation Material Analysis Mono   Rail Scale Home Page
Hisar Terazi blu_stl.gif (1232 bytes)5 blu_stl.gif (1232 bytes)1 ---- blu_stl.gif (1232 bytes)2

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TESS blu_stl.gif (1232 bytes)1 blu_stl.gif (1232 bytes)4 ---- ---- ---- blu_stl.gif (1232 bytes)5 ---- www.tessedis.com
Baster blu_stl.gif (1232 bytes)2 blu_stl.gif (1232 bytes)5 ---- blu_stl.gif (1232 bytes)1 blu_stl.gif (1232 bytes)3 blu_stl.gif (1232 bytes)3 ---- www.baster.com.tr
Tunaylar ---- blu_stl.gif (1232 bytes)6 blu_stl.gif (1232 bytes)1 ---- blu_stl.gif (1232 bytes)5 ---- ---- www.tunaylar.com
Esit ---- blu_stl.gif (1232 bytes)2 blu_stl.gif (1232 bytes)2 blu_stl.gif (1232 bytes)3 blu_stl.gif (1232 bytes)1 blu_stl.gif (1232 bytes)1 blu_stl.gif (1232 bytes)2 www.esit.com.tr
Baykon ---- blu_stl.gif (1232 bytes)3 blu_stl.gif (1232 bytes)4 ---- blu_stl.gif (1232 bytes)2 blu_stl.gif (1232 bytes)4 blu_stl.gif (1232 bytes)3 www.baykon.com.tr
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Mostly used ADCs in History of Electronic Weighing (December 2001) :

1- 7135 (20000 internal counts of resolution, dual slope BCD output, not suggested for new designs)

2- TC500  (16bit + sign  equivalent counts, 3 pin connection to microcontroller, dual slope, not suggested for new designs)

3- CS5520 (20 bit sigma-delta converter, serial output, not suggested for new designs)

4-AD7730 (24 bit sigma-delta convertor, serial output)

1- CIRRUS LOGIC most popular  Delta-Sigma ADCs

a)   CS 5510/11/12/13 :

Delta-sigma (DS) analog-to-digital converter 
Linearity error: 0.0015% FS 
Noise-free resolution: up to 17-Bits 
Differential bipolar analog inputs 
V REF input range from 250 mV to 5 V 
50/60 Hz simultaneous rejection (CS5510/12) 
16 to 326 Hz output word rate 
On-chip oscillator (CS5511/13) 
Power supply configurations: 
V+ = 5 V, V- = 0 V 
Multiple dual supply arrangements 
Low power consumption 
Normal mode, 2.5 mW 
Sleep mode, 10 mW 
Low-cost, compact, 8-pin package 

b)  CS 5516/5520

On-chip instrumentation amplifier 
On-chip programmable gain amplifier 
On-chip 4-bit D/A for offset removal 
Dynamic excitation options 
Linearity error: ±0.0015% FS 20-bit no missing codes 
CMRR at 50/60 Hz >200 dB 
System calibration capability with calibration read/write option 
3-, 4-, or 5-wire serial communications port 
Low power consumption: 40 mW (10 mW standby mode for portable applications) 

c)  CS 5531/32/34

Chopper-stabilized PGIA (programmable gain instrumentation amplifier, 1x to 64x) 
6 nV/ÖHz @ 0.1 Hz (No 1/f noise) 
<500 pA input current with gains >1 
Delta sigma (DS) analog-to-digital converter 
Linearity error: 0.0007% FS 
Noise-free resolution: Up to 23 bits 
Two or four channel differential MUX 
Scalable input span via calibration 
5 mV to 5 V 
Scalable V REF input: up to analog supply 
On-chip guard drive output buffer 
Simple three-wire serial interface 
SPI ® and Microwire™ Compatible 
Schmitt Trigger on Serial Clock (SCLK) 

 

 

2- ANALOG DEVICES   Delta-Sigma ADC selection guide

Table 1: Additional information on 50mW and 25mW Power Consumption ADCs
Generic Part # and Description Resolution, Bits Output Word Rate, max Number & Type of I/P Channels Analog Input Ranges Power Supplies ADC Reference
AD7710
Signal Conditioning ADC with On Chip 20 µA Current Source
24 1 kHz 2 Differential VREF/Gain or ±VREF/Gain (8 Gain Settings) 5V for positive-only inputs or ±5V for true negative inputs Internal 2.5V or External 2.5V. Differential Reference Inputs.
AD7711
Signal Conditioning ADC with Matched 200 µA RTD Excitation Current Sources
24 1 kHz 1 Differential and 1 Single-Ended fo Low-Level Signals VREF/Gain or ±VREF/Gain (8 Gain Settings) 5V for positive-only inputs or ±5V for true negative inputs Internal 2.5V or External 2.5V. Differential Reference Inputs.
AD7711A
Signal Conditioning ADC with 400 µA RTD Current Source
24 1 kHz 2 Differential VREF/Gain or ±VREF/Gain (8 Gain Settings) 5V for positive-only inputs or ±5V for true negative inputs Internal 2.5V or External 2.5V. Differential Reference Inputs.
AD7712
Signal Conditioning ADC with On Chip 20 Input Signal Attenuator
24 1 kHz 1 Differential and 1 Single-Ended for High Level Signals VREF/Gain or ±VREF/Gain, 10V or ±10V (8 Gain Settings) 5V for positive-only inputs or ±5V for true negative inputs Internal 2.5V or External 2.5V. Differential Reference Inputs.
AD7730
Bridge Transducer ADC for Load Cell Applications
24 1.2 kHz 2 Differential 10 mV/20 mV/40 mV/80 mV Analog Supply 5V Only; Digital Supply 3V or 5V External 2.5V or 5V only. Reference I/P can be tied to AVDD.
AD7730L
Bridge Transducer ADC For Low Power Applications
24 600 Hz 2 Differential 10 mV/20 mV/40 mV/80 mV Analog Supply 5V Only; Digital Supply 3V or 5V External 2.5V or 5V only. Reference I/P can be tied to AVDD.
AD7731
Low Noise, 24-Bit ADC with Fast Channel-Channel Settling time
24 6.4 kHz 3 Differential or 5 Pseudo-Differential VREF/Gain or ±VREF/Gain (7 Gain Settings) Analog Supply 5V Only; Digital Supply 3V or 5V External Only. Reference I/P can be tied to AVDD.
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Table 2: Additional information on 5mW and 1mW Power Consumption ADCs
Generic Part # and Description Resolution, Bits Output Word Rate, max Number & Type of I/P Channels Analog Input Ranges Power Supplies ADC Reference
AD7705
General Purpose ADC offering 1 mW Power Dissipation
16 500 Hz 2 Differential VREF/Gain or ±VREF/Gain (8 Gain Settings) 3V or 5V External Only. Differential Reference Inputs.
AD7706
General Purpose ADC Offering 1 mW Power Dissipation
16 500 Hz 3 Pseudo-Differential VREF/Gain or ±VREF/Gain (8 Gain Settings) 3V or 5V External Only. Differential Reference Inputs.
AD7707
General Purpose ADC offering 1 mW Power Dissipation
16 500 Hz 2 Pseudo-Differential and 1 Single-Ended for High Level Signals VREF/Gain or ±VREF/Gain (including ±100 mV), 5V, 10V, ±5V, and ±10V (8 Gain Settings) 3V or 5V. True negative inputs with positive-only supply. External Only. Differential Reference Inputs.
AD7708
Multi-channel ADC with choice of Reference Inputs. Pin-compatible with AD7718
16 1365 Hz 4 or 5 Differential or 8 or 10 Single-Ended ±VREF/Gain (8 Gain Settings) 3 V or 5 V External Only. Choice of two Differential Reference Inputs.
AD7709
Versatile ADC with Switchable Current Sources and choice of Reference Sources
16 105 Hz 2 Differential or 3 Pseudo-Differential ±VREF/Gain (8 Gain Settings) 3 V or 5 V External Only. Choice of two Differential Reference Inputs.
AD7713
Signal Conditioning ADC with Matched RTD Current Sources
24 200 Hz 2 Differential and 1 Single-Ended for High Level Signals VREF/Gain or ±VREF/Gain, 10V (8 Gain Settings) 5V Internal 2.5V or External 2.5V. Differential Reference Inputs.
AD7714
High Accuracy ADC for Low Power Applications
24 1 kHz 3 Differential or 5 Pseudo-Differential VREF/Gain or ±VREF/Gain (8 Gain Settings) Analog Supply 3V or 5V; Digital Supply 3V or 5V External Only. Differential Reference Inputs.
AD7715
General Purpose ADC for Low Power Applications
16 500 Hz 1 Differential VREF/Gain or ±VREF/Gain (4 Gain Settings) Analog Supply 3V or 5V; Digital Supply 3V or 5V External Only. Differential Reference Inputs.
AD7718
Multi-channel ADC with choice of Reference Inputs. Pin-compatible with AD7708.
24 1365 Hz 4 or 5 Differential or 8 or 10 Single-Ended ±VREF/Gain (8 Gain Settings) 3 V or 5 V External Only. Choice of two Differential Reference Inputs.
AD7719
Contains two separate ADC's with switchable current sources, low-side power switches and Factory Calibration.
24 and 16 105 Hz 2 Differential or 3 Pseudo-Differential for Main channel, 2 Single-Ended and 1 Differential or 3 Single-Ended for Secondary Channel ±REFIN1/Gain (8 Gain Settings) for Main Channel, ±REFIN2/Gain (2 Gain Settings) 3 V or 5 V External Only. Differential Reference Inputs.
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e-mail berk@berk.tc