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參數(shù)資料
| 型號： | TC7117 |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD |
| 中文描述： | 3-1/2數(shù)字模擬數(shù)字轉(zhuǎn)換器拒不退讓 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 218K |
| 代理商： | TC7117 |
3-211
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
negative supply for externally-generated segment drivers,
such as decimal points or any other presentation the user
may want to include on the LCD. (Figures 5 and 6 show
such an application.) No more than a 1 mA load should be
applied.
The second function is a "lamp test." When TEST is
pulled HIGH (to V
+
), all segments will be turned ON and
the display should read –1888. The TEST pin will sink
about 10 mA under these conditions.
DIGITAL SECTION
Figures 8 and 9 show the digital section for TC7116/
TC7116A and TC7117/TC7117A, respectively. For the
TC7116/TC7116A (Figure 8), 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 backplane (BP)
voltage is switched. The BP frequency is the clock fre-
quency
4
800. For 3 readings per second, this is a 60-Hz
square wave with a nominal amplitude of 5V. The seg-
ments 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 9 is the digital section of the TC7117/TC7117A.
It is identical to the TC7116/TC7116A, except that the
regulated supply and BP drive have been eliminated, and
the segment drive is typically 8 mA. The 1000's output (pin
19) sinks current from two LED segments, and has a 16-mA
drive capability. The TC7117/TC7117A are designed to
drive common anode LED displays.
In both devices, the polarity indication is ON for analog
inputs. If V
–
reversed also, if desired.
IN
and V
+N
are reversed, this indication can be
Figure 8. TC7116/TC7116A Digital Section
TC7116
TC7116A
LCD PHASE DRIVER
THOUSANDS
HUNDREDS
TENS
UNITS
4
BACKPLANE
21
39
37
OSC
INTERNAL DIGITAL GROUND
V+
V–
TEST
6.2V
500
26
35
TO SWITCH DRIVERS
FROM COMPARATOR OUTPUT
CLOCK
VTH = 1V
7-SEGMENT
DECODE
7-SEGMENT
DECODE
7-SEGMENT
DECODE
200
40
38
TYPICAL SEGMENT OUTPUT
INTERNAL DIGITAL GROUND
SEGMENT
OUTPUT
V+
0.5 mA
2 mA
LATCH
2
OSC3
OSC1
÷
÷
HLDR
;
70 k
LOGIC CONTROL
1
3-1/2 DIGIT ANALOG-TO-DIGITAL
CONVERTERS WITH HOLD
TC7116
TC7116A
TC7117
TC7117A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC7117A | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD |
| TC7117ACLW | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD |
| TC7116CPL | TRANS NPN 10VCEO 80MA MINI-3P |
| TC7117ACPL | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD |
| TC7117CLW | 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC7117A | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:3-1/2 Digit Analog-to-Digital Converters with Hold |
| TC7117ACKW | 功能描述:LED顯示驅(qū)動(dòng)器 w/Hold RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TC7117ACKW713 | 功能描述:LED顯示驅(qū)動(dòng)器 w/Hold RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TC7117ACLW | 功能描述:LED顯示驅(qū)動(dòng)器 w/Hold RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| TC7117ACLW713 | 功能描述:LED顯示驅(qū)動(dòng)器 w/Hold RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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