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부품번호 ILC7107S 기능
기능 (ILC7106 / ILC7107) LCD Display
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ILC7107S 데이터시트, 핀배열, 회로
www.DataSheet4U.com
January 1998
ICL7106, ICL7107,
ICL7106S, ICL7107S
31/2 Digit,
LCD/LED Display, A/D Converters
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 Display Drive
- LCD ICL7106, LED lCL7107
• 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 (ICL7106S, ICL7107S)
Ordering Information
PART NO.
TEMP.
RANGE (oC)
PACKAGE
PKG. NO.
Description
The Intersil ICL7106 and ICL7107 are high performance, low
power, 31/2 digit A/D converters. Included are seven seg-
ment decoders, display drivers, a reference, and a clock.
The ICL7106 is designed to interface with a liquid crystal dis-
play (LCD) and includes a multiplexed backplane drive; the
ICL7107 will directly drive an instrument size light emitting
diode (LED) display.
The ICL7106 and ICL7107 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/oC, input
bias current of 10pA (Max), and rollover error of less than
one count. True differential inputs and reference are useful in
all systems, 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 (ICL7106), enables a high performance
panel meter to be built with the addition of only 10 passive
components and a display.
ICL7106CPL
0 to 70 40 Ld PDIP
E40.6
ICL7106RCPL
0 to 70 40 Ld PDIP (Note) E40.6
ICL7106CM44
0 to 70 44 Ld MQFP
Q44.10x10
ICL7106SCPL
0 to 70 40 Ld PDIP
E40.6
ICL7107SCPL
0 to 70 40 Ld PDIP
E40.6
ICL7107CPL
0 to 70 40 Ld PDIP
E40.6
ICL7107RCPL
0 to 70 40 Ld PDIP (Note) E40.6
ICL7107CM44
0 to 70 44 Ld MQFP
Q44.10x10
NOTE: “R” indicates device with reversed leads for mounting to PC
board underside. “S” indicates enhanced stability.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999 1
File Number 3082.2




ILC7107S pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
ICL7106, ICL7107, ICL7106S, ICL7107S
Electrical Specifications (Note 3) (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
DISPLAY DRIVER ICL7107 ONLY
Segment Sinking Current
(Except Pins 19 and 20)
V+ = 5V, Segment Voltage = 3V
58 -
mA
Pin 19 Only
10 16
-
mA
Pin 20 Only
47 -
mA
NOTES:
3. Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
4. Unless otherwise noted, specifications apply to both the ICL7106 and ICL7107 at TA = 25oC, fCLOCK = 48kHz. ICL7106 is tested in the
circuit of Figure 1. ICL7107 is tested in the circuit of Figure 2.
5. 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.
6. Not tested, guaranteed by design.
7. Sample Tested.
Typical Applications and Test Circuits
+-
IN
9V
R1 R5
R3
R4
C4
C1
C5 C2 R2
C3
DISPLAY
ICL7106
DISPLAY
C1 = 0.1µF
C2 = 0.47µF
C3 = 0.22µF
C4 = 100pF
C5 = 0.02µF
R1 = 24k
R2 = 47k
R3 = 100k
R4 = 1k
R5 = 1M
FIGURE 1. ICL7106 TEST CIRCUIT AND TYPICAL APPLICATION WITH LCD DISPLAY COMPONENTS SELECTED FOR 200mV
FULL SCALE
+5V + - -5V
IN
R1 R5
R3
R4
C4
C1
C5 C2 R2
C3
DISPLAY
ICL7107
C1 = 0.1µF
C2 = 0.47µF
C3 = 0.22µF
C4 = 100pF
C5 = 0.02µF
R1 = 24k
R2 = 47k
R3 = 100k
R4 = 1k
R5 = 1M
DISPLAY
FIGURE 2. ICL7107 TEST CIRCUIT AND TYPICAL APPLICATION WITH LED DISPLAY COMPONENTS SELECTED FOR 200mV
FULL SCALE
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ICL7106, ICL7107, ICL7106S, ICL7107S
Differential Reference
The reference voltage can be generated anywhere within the
power supply voltage of the converter. The main source of com-
mon mode error is a roll-over voltage caused by the reference
capacitor losing or gaining charge to stray capacity on its
nodes. If there is a large common mode voltage, the reference
capacitor can gain charge (increase voltage) when called up to
de-integrate a positive signal but lose charge (decrease volt-
age) when called up to de-integrate a negative input signal.
This difference in reference for positive or negative input voltage
will give a roll-over error. However, by selecting the reference
capacitor such that it is large enough in comparison to the stray
capacitance, this error can be held to less than 0.5 count worst
case. (See Component Value Selection.)
Analog COMMON
This pin is included primarily to set the common mode
voltage for battery operation (ICL7106) or for any system
where the input signals are floating with respect to the power
supply. The COMMON pin sets a voltage that is approxi-
mately 2.8V more negative than the positive supply. This is
selected to give a minimum end-of-life battery voltage of
about 6V. However, analog COMMON has some of the
attributes of a reference voltage. When the total supply
voltage is large enough to cause the zener to regulate (>7V),
the COMMON voltage will have a low voltage coefficient
(0.001%/V), low output impedance (15), and a
temperature coefficient typically less than 80ppm/oC.
The limitations of the on chip reference should also be
recognized, however. With the ICL7107, the internal heating
which results from the LED drivers can cause some
degradation in performance. Due to their higher thermal resis-
tance, plastic parts are poorer in this respect than ceramic.
The combination of reference Temperature Coefficient (TC),
internal chip dissipation, and package thermal resistance can
increase noise near full scale from 25µV to 80µVP-P. Also the
linearity in going from a high dissipation count such as 1000
(20 segments on) to a low dissipation count such as 1111(8
segments on) can suffer by a count or more. Devices with a
positive TC reference may require several counts to pull out of
an over-range condition. This is because over-range is a low
dissipation mode, with the three least significant digits
blanked. Similarly, units with a negative TC may cycle
between over-range and a non-over-range count as the die
alternately heats and cools. All these problems are of course
eliminated if an external reference is used.
The ICL7106, with its negligible dissipation, suffers from
none of these problems. In either case, an external
reference can easily be added, as shown in Figure 4.
Analog COMMON is also used as the input low return during
auto-zero and de-integrate. If IN LO is different from analog
COMMON, a common mode voltage exists in the system
and is taken care of by the excellent CMRR of the converter.
However, in some applications IN LO will be set at a fixed
known voltage (power supply common for instance). In this
application, analog COMMON should be tied to the same
point, thus removing the common mode voltage from the
converter. The same holds true for the reference voltage. If
reference can be conveniently tied to analog COMMON, it
should be since this removes the common mode voltage
from the reference system.
Within the lC, analog COMMON is tied to an N-Channel FET
that can sink approximately 30mA of current to hold the
voltage 2.8V below the positive supply (when a load is trying
to pull the common line positive). However, there is only
10µA of source current, so COMMON may easily be tied to a
more negative voltage thus overriding the internal reference.
V+
V
REF HI
REF LO
ICL7106
ICL7107
6.8V
ZENER
IZ
V-
FIGURE 4A.
V+
V
ICL7106
ICL7107
20k
REF HI
REF LO
COMMON
6.8k
ICL8069
1.2V
REFERENCE
FIGURE 4B.
FIGURE 4. USING AN EXTERNAL REFERENCE
TEST
The TEST pin serves two functions. On the ICL7106 it is
coupled to the internally generated digital supply through a
500resistor. 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. Figures 5 and 6 show such an application.
No more than a 1mA load should be applied.
V+ 1M
ICL7106
TO LCD
DECIMAL
POINT
BP
TEST
21
37
TO LCD
BACKPLANE
FIGURE 5. SIMPLE INVERTER FOR FIXED DECIMAL POINT
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