參數(shù)資料
型號： TC7107AIJL
廠商： TelCom Semiconductor, Inc.
英文描述： JT 66C 66#22M SKT PLUG
中文描述： 3-1/2位數(shù)的A / D轉(zhuǎn)換器
文件頁數(shù)： 9/19頁
文件大?。?/td> 296K
代理商： TC7107AIJL
3-191
TELCOM SEMICONDUCTOR, INC.
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When the TEST pin on the TC7106A is pulled to V
+
, all
segments are turned “ON.” The display reads –1888. During
this mode the LCD segments have a constant DC voltage
impressed. DO NOT LEAVE THE DISPLAY IN THIS MODE
FOR MORE THAN SEVERAL MINUTES! LCD displays
may be destroyed if operated with DC levels for extended
periods.
The display font and the segment drive assignment are
shown in Figure 4.
DISPLAY FONT
1000's
100's
10's
1's
In the TC7106A, an internal digital ground is generated
from a 6 volt zener diode and a large P channel source
follower. This supply is made stiff to absorb the large
capacitive currents when the backplane voltage is switched.
DIGITAL SECTION (TC7107A)
Figure 5 shows the TC7107A. It is designed to drive
common anode LEDs. It is identical to the TC7106A except
that the regulated supply and backplane drive have been
eliminated and the segment drive is typically 8mA. The
1000's output (pin 19) sinks current from two LED segments,
and has a 16mA drive capability.
In both devices, the polarity indication is “ON” for nega-
tive analog inputs. If V
–
can be reversed also, if desired.
The display font is the same as the TC7106A.
IN
and V
+
are reversed, this indication
System Timing
The oscillator frequency is divided by 4 prior to clocking
the internal decade counters. The three-phase measure-
ment cycle takes a total of 4000 counts or 16000 clock
pulses. The 4000 count cycle is independent of input signal
magnitude.
Each phase of the measurement cycle has the following
length:
Auto-Zero Phase: 1000 to 3000 Counts
(4000 to 12000 Clock Pulses)
For signals less than full-scale, the auto-zero phase is
assigned the unused reference integrate time period.
Signal Integrate: 1000 Counts
(4000 Clock Pulses)
[ ]
f
OSC
This time period is fixed. The integration period is:
T
SI
= 4000
Where f
OSC
is the externally set clock frequency.
Reference Integrate: 0 to 2000 Counts
(0 to 8000 Clock Pulses)
The TC7106A/7107A are drop-in replacements for the
7106/7107 parts. External component value changes are
not required to benefit from the low drift internal reference.
Clock Circuit
Three clocking methods may be used:
1.
An external oscillator connected to pin 40.
2.
A crystal between pins 39 and 40.
3.
An R-C oscillator using all three pins.
COMPONENT VALUE SELECTION
Auto-Zero Capacitor –
C
AZ
The C
AZ
capacitor size has some influence on system
noise. A 0.47
μ
F capacitor is recommended for 200mV full-
scale applications where 1 LSB is 100
μ
V. A 0.047
μ
F capaci-
tor is adequate for 2.0V full-scale applications. A mylar
dielectric capacitor is adequate.
Reference Voltage Capacitor –
C
REF
The reference voltage used to ramp the integrator
output voltage back to zero during the reference-integrate
cycle is stored on C
REF
. A 0.1
μ
F capacitor is acceptable
when V
–
voltage exists (V
–
requires 200mV full-scale, increase C
REF
to 1.0
μ
F. Rollover
error will be held to less than 1/2 count. A mylar dielectric
capacitor is adequate.
IN
is tied to analog common. If a large common-mode
REF
≠
analog common) and the application
TC7106A
TC7107A
4
CRYSTAL
RC NETWORK
40
38
EXT
OSC
39
÷
TO TEST PIN ON TSC7106A
TO GND PIN ON TSC7107A
TO
COUNTER
Figure 4. Display Font and Segment Assignment
1
TC7106
TC7106A
TC7107
TC7107A
3-1/2 DIGIT A/D CONVERTERS
Figure 6. Clock Circuits
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TC7107AIPL 功能描述:LED顯示驅(qū)動器 w/LED Driver 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
TC7107ARCPL 功能描述:LED顯示驅(qū)動器 w/LED Driver 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
TC7107CKW 功能描述:LED顯示驅(qū)動器 w/LED Driver 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
TC7107CKW713 功能描述:LED顯示驅(qū)動器 w/LED Driver 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
TC7107CLW 功能描述:LED顯示驅(qū)動器 w/LED Driver 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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