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參數(shù)資料
| 型號： | ICL7107S |
| 廠商： | Intersil Corporation |
| 元件分類： | 串行ADC |
| 英文描述： | LED Display, A/D Converters(3 1/2 位LED 顯示器驅(qū)動 A/D轉(zhuǎn)換器) |
| 中文描述： | LED顯示，A / D轉(zhuǎn)換（3 1 / 2位發(fā)光顯示器驅(qū)動的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 534K |
| 代理商： | ICL7107S |
8
FN3082.8
Digital Section
Figures 7 and 8 show the digital section for the ICL7106 and
ICL7107, respectively. In the ICL7106, an internal digital
ground is generated from a 6V Zener diode and a large
P-Channel source follower. This supply is made stiff to
absorb the relative large capacitive currents when the back
plane (BP) voltage is switched. The BP frequency is the
clock frequency divided by 800. For three readings/sec., this
is a 60Hz square wave with a nominal amplitude of 5V. The
segments are driven at the same frequency and amplitude
and are in phase with BP when OFF, but out of phase when
ON. In all cases negligible DC voltage exists across the
segments.
Figure 8 is the Digital Section of the ICL7107. It is identical to
the ICL7106 except that the regulated supply and back plane
drive have been eliminated and the segment drive has been
increased from 2mA to 8mA, typical for instrument size
common anode LED displays. Since the 1000 output (pin 19)
must sink current from two LED segments, it has twice the
drive capability or 16mA.
In both devices, the polarity indication is “on” for negative
analog inputs. If IN LO and IN HI are reversed, this indication
can be reversed also, if desired.
ICL7106
V+
BP
TEST
DECIMAL
POINT
SELECT
CD4030
GND
V+
TO LCD
DECIMAL
POINTS
FIGURE 6. EXCLUSIVE ‘OR’ GATE FOR DECIMAL POINT DRIVE
7
SEGMENT
DECODE
SEGMENT
OUTPUT
0.5mA
2mA
INTERNAL DIGITAL GROUND
TYPICAL SEGMENT OUTPUT
V+
LCD PHASE DRIVER
LATCH
7
SEGMENT
DECODE
÷
200
LOGIC CONTROL
INTERNAL
DIGITAL
GROUND
V
TH
= 1V
7
SEGMENT
DECODE
1000’s
COUNTER
100’s
10’s
1’s
TO SWITCH DRIVERS
FROM COMPARATOR OUTPUT
÷
4
CLOCK
40
39
38
OSC 1
OSC 2
OSC 3
BACKPLANE
21
V+
TEST
V-
500
37
26
6.2V
COUNTER
COUNTER
COUNTER
1
c
a
b
c
d
f
g
e
a
b
a
b
c
d
f
g
e
a
b
c
d
f
g
e
THREE INVERTERS
ONE INVERTER SHOWN FOR CLARITY
FIGURE 7. ICL7106 DIGITAL SECTION
ICL7106, ICL7107, ICL7107S
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| ICL7106S | LCDDisplay, A/D Converters(3 1/2 位驅(qū)動LCD顯示器的A/D轉(zhuǎn)換器) |
| ICL7106 | LCD Display, A/D Converters(3 1/2 位驅(qū)動LCD顯示器的A/D轉(zhuǎn)換器) |
| ICL7107 | LED Display, A/D Converters(3 1/2 位LED 顯示器驅(qū)動 A/D轉(zhuǎn)換器) |
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| ICL7109 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:N-CHANNEL JFET |
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