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PDF ( 数据手册 , 数据表 ) M7206

零件编号 M7206
描述 3 1/2 LCD DISPLAY DRIVER / A/D CONVERTERS
制造商 Unisonic Technologies
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M7206 数据手册, 描述, 功能
UNISONIC TECHNOLOGIES CO., LTD
M7206
3 1/2 LCD DISPLAY DRIVER, A/D
CONVERTERS
DESCRIPTION
The UTC M7206 is a 3 1/2 A/D converter IC with low power supply
and excellent performance, which also can greatly refrain form
interfering. The M7206 combines seven -phase decoder, display
driver, reference source, clock system and back light polarity driver, so
it can directly drive LCD. Compared with other products, the M7206
adds a new function that can detect on-off state and then alarm.
The M7206 covers high-precision, good compatibility and low-cost
in all. It can achieve auto-zero adjustment error less than 10uV, zero
drift within 1uV/°C, input current below 10pA and converter error
under 1 count.
FEATURES
* On-off state detecting and alarming
* Zero auto-adjustment, guaranteed zero reading with zero input.
* True polarity indication for precision null detection.
* Differential inputs and differential reference.
* Triplex LCD display.
* Convenient 9V battery operation
* CMOS differential inputs for high impedance and null attenuation
* Low noise and A/D converter,
* Low noise A/D converter, stable display.
* Inner clock circuit , can form astable multi-vibrator by connecting
passive electronic component.
* Optional exterior clock signal input
* Has triggered buttons that keep and low voltage alarm function that
power
* On-chip voltage reference, 60ppm/°C drift.
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
M7206L-QL1-Y
M7206G-QL1-Y
Package
LQFP-44
CMOS IC
Packing
Tray
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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M7206 pdf, 数据表
M7206
CMOS IC
Detailed Description(Cont.)
TEST
The TEST pin serves two functions. Within IC it is coupled to the internally generated digital supply through an
NMOS. Thus it can be used as the negative supply for externally generated segment drivers such as decimal points
or any other presentation the user may want to include on the LCD display. The second function is a “lamp test”.
When TEST is pulled high(to V+)all segment will be turned on and output should be “1888”.
Component Value Selection
Integrating Resistor
Both the buffer amplifier and the integrator have an output stage with 100μA of quiescent current. They can supply
4μA of drive current with negligible nonlinearity. The integrating resistor should be large enough to remain in this
very linear region over the input voltage range, but small enough that undue leakage requirements are not placed on
the PC board. For 2V full scale, 470kis near optimum and similarly a 47kfor a 200mV scale.
Integrating Capacitor
The integrating capacitor should give the maximum voltage swing that ensures tolerance buildup will not saturate
the integrator swing (approximately. 0.3V from either supply). When the analog COMMON is used as a reference, a
nominal +2V full-scale integrator swing is fine. For three readings /second (48 kHz clock) nominal values for ClNT
are 0.22μF and 0.10μF, respectively. Of course, if different oscillator frequencies are used, these values should be
changed in inverse proportion to maintain the same output swing.
An additional requirement of the integrating capacitor is that it must have a low dielectric absorption to prevent
roll-over errors. While other types of capacitors are adequate for this application, polypropylene capacitors give the
best choice.
Auto-Zero Capacitor
The size of the auto-zero capacitor has some influence on the noise of the system. For 200mV full scale where
noise is very important, a 0.47μF capacitor is recommended. On the 2V scale, a 0.047μF capacitor increases the
speed of recovery from overload and is adequate for noise on this scale.
Oscillator Components
For all ranges of frequency a 100kresistor is recommended and the capacitor is selected from the equation:
f 0.45 / RC For 48kHz clock(3 Reading/sec),
C=100pF.
Reference Capacitor
A 0.1μF capacitor gives good results in most applications. However, where a large common mode voltage exists
and a 200mV scale is used, a larger value is required to prevent roll-over error. Generally 1μF will hold the roll-over
error to 0.5 count in this instance.
Reference Voltage
The analog input required to generate full scale output (2000 counts) is: VIN 2VREF . Thus, for the 200mV and 2V
scale, VREF should equal 100mV and 1V, respectively. However, in some applications the full-scale input voltage may
be other than 200mV or 2V, but 600mV. For example, the reference voltage should be set to 300mV and the input
signal can be used directly without being divided.
The differential reference can be used during the measurement of resistor by the ratio metric method and when a
digital reading of zero is desired for VIN0. A compensating offset voltage can be applied between COM and IN LO
and the voltage of being measured is connected between COM and IN HI.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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