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기능 A/D CONVERTERS
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7106 데이터시트, 핀배열, 회로
UNISONIC TECHNOLOGIES CO., LTD
7106
3½ DIGIT, LCD DISPLAY, A/D
CONVERTERS
„ DESCRIPTION
The UTC 7106 is a high performance, low power,3½ digits A/D
converter. Included are seven segment decoders, display drivers, a
reference, and a clock.
The UTC 7106 is designed to interface with a liquid crystal
display (LCD) and includes a multiplexed backplane drive.
The UTC 7106 bring together a combination of high accuracy,
versatility, and true economy. It features auto zero to less than
10μV, zero drift of less than 1μV/°C, input bias current of 10pA
(Max), and rollover error of less than one count. True differential
inputs and reference are useful in all system, but give the designer
an uncommon advantage when measuring load cells, strain
gauges and other bridge type transducers. Finally, the true
economy of single power supply operation, enables a high
performance panel meter to be built with the addition of only 10
passive components and a display.
„ FEATURES
*Guaranteed Zero Reading for 0V Input On All Scales
*True Polarity At Zero for Precise Null Detection
*1pA Typical Input Current
*True Differential Input And Reference, Direct Drive
LCD Display
*Low Noise-Less than 15μVp-p
*On chip Clock and Reference
*Low Power Dissipation-Typically Less than 10mW
*No Additional Active Circuits Required
*Enhanced Display Stability
„ ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
7106L-D40-T
7106G-D40-T
7106L-R40-R
7106G-R40-R
7106L-R40-T
7106G-R40-T
7106L-QM1-Y
7106G-QM1-Y
Package
DIP-40
SSOP-40
SSOP-40
QFP-44
CMOS IC
Packing
Tube
Tape Reel
Tube
Tray
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
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7106 pdf, 반도체, 판매, 대치품
7106
CMOS IC
„ ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
DISPLAY DRIVER
Peak-to-Peak Segment Drive Voltage
Peak-to-Peak Backplane Drive
Voltage
VD,PP V+ ~ V-=9V(Note 1)
4 5.5 6 V
Note: 1. Back plane drive is in phase with segment drive for”off”segment,180 degrees out of phase for ”on” segment .
Frequency is 20 times conversion rate. Average DC component is less than 50mV.
2. Not tested, guaranteed by design.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 18
QW-R502-018.E

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7106 전자부품, 판매, 대치품
7106
„ TYPICAL INTEGRATOR AMPLIFIER OUTPUT WAVEFORM (INT PIN)
CMOS IC
„ DETAILED DESCRIPTION
ANALOG SECTION
Fig.1 shows the Analog Section for the UTC 7106. Each measurement cycle is divided into three phases. They
are(1) auto-zero(A-Z), (2)signal integrate (INT)and (3)de-integrate(DE).
AUTO-ZERO PHASE
During auto-zero three things happen. First, input high and low are disconnected from the pins and internally
shorted to analog COMMON. Second, the reference capacitor is charged to the reference voltage. Third, a feedback
loop is closed around the system to charge the auto-zero capacitor CAZ to compensate for offset voltages in the
buffer amplifier, integrator, and comparator. Since the comparator is included in the loop, the A-Z accuracy is limited
only by the noise of the system. In any case, the offset referred to the input is less than 10μV.
SIGNAL INTEGRATE PHASE
During signal integrate, the auto-zero loop is opened, the internal short is removed, and the internal input high and
low are connected to the external pins. The converter then integrates the differential voltage between IN HI and IN
LO for a fixed time. This differential voltage can be within a wide common mode range: up to 1V from either supply. if,
on the other hand, the input signal has no return with respect to the converter power supply, IN LO can be tied to
analog COMMON to establish the correct common mode voltage. At the end of this phase, the polarity of the
integrated signal is determined.
DE-INTEGRATE PHASE
The final phase is de-integrate, or reference integrate. Input low is internally connected to analog COMMON and
input high is connected across the previously charged reference capacitor. Circuitry within the chip ensures that the
capacitor will be connected with the correct polarity to cause the integrator output to return to zero. The time required
for the output to return to zero is proportional to the input signal. Specifically the digital reading displayed is:
DISPLAY COUNT=1000( VIN/ VREF ).
DIFFERENTIAL INPUT
The input can accept differential voltages anywhere within the common mode range of the input amplifier, or
specifically from 0.5V below the positive supply to 1V above the negative supply. In this range, the system has a
CMRR of 86dB typical. However, care must be exercised to assure the integrator output does not saturate. A worst
case condition would be a large positive common mode voltage with a near full scale negative differential input
voltage. The negative input signal drives the integrator positive when most of its swing has been used up by the
positive common mode voltage. For these critical applications the integrator output swing can be reduced to less
than the recommended 2V full scale swing with little loss of accuracy. The integrator output can swing to within 0.3V
of either supply without loss of linearity.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 18
QW-R502-018.E

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