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參數(shù)資料
| 型號： | TC7136 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Low Power 3-1/2 Digit Analog-to-Digital Converter |
| 中文描述： | 低功耗3-1/2數(shù)字模擬到數(shù)字轉換器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 192K |
| 代理商： | TC7136 |
3-254
TELCOM SEMICONDUCTOR, INC.
TC7136
TC7136A
LOW POWER, 3-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTERS
Figure 4. Conversion Timing During Normal Operation
System Timing
The oscillator frequency is divided by 4 prior to clocking
the internal decade counters. The four-phase measure-
ment cycle takes a total of 4000 counts, or 16,000 clock
Figure 5. Conversion Timing During Overrange Operation
DIGITAL SECTION
The TC7136/A contains all the segment drivers neces-
sary to directly drive a 3-1/2 digit LCD. An LCD backplane
driver is included. The backplane frequency is the external
clock frequency divided by 800. For three conversions per
second the backplane frequency is 60 Hz with a 5V nominal
amplitude. When a segment driver is in-phase with the
backplane signal, the segment is OFF. An out-of-phase
segment drive signal causes the segment to be ON, or
visible. This AC drive configuration results in negligible DC
voltage across each LCD segment, ensuring long LCD life.
The polarity segment driver is ON for negative analog inputs.
If V
IN
On the TC7136/A, when the TEST pin is pulled to V
+
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. LCDS MAY BE
DESTROYED IF OPERATED WITH DC LEVELS FOR
EXTENDED PERIODS.
The display font and segment drive assignment are
shown in Figure 6.
+
and V
IN
–
are reversed, this indicator would reverse.
pulses. The 4000-count cycle is independent of input signal
magnitude.
Each phase of the measurement cycle has the following
length:
(1) Auto-zero phase: 3000 to 2900 counts
(1200 to 11,600 clock pulses)
1000 counts
(4000 clock pulses)
(2) Signal integrate:
This time period is fixed. The integration period is:
t
SI
= 4000
,
where f
OSC
is the externally-set clock frequency.
(3) Reference integrate: 0 to 2000 counts
(4) Zero integrator: 11 to 640 counts
The TC7136 is a drop-in replacement for the TC7126
and ICL7126. The TC7136A offers a greatly-improved inter-
nal reference temperature coefficient. Minor component
value changes are required to upgrade existing designs and
improve the noise performance.
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 200 mV full-
scale applications where 1 LSB is 100
μ
V. A 0.1
μ
F capacitor
is adequate for 2V full-scale applications. A Mylar-type
dielectric capacitor is adequate.
Reference Voltage Capacitor
(C
REF
)
The reference voltage, used to ramp the integrator
Figure 6. Display FONT and Segment Assignment
1
f
OSC
INT
DENT
ZI
AZ
4000
910–2900
1–2000
1000
11–140
AZ
4000
ZI
DEINT
INT
1000
2001–2090
31–640
300–910
DISPLAY FONT
1000's
100's
10's
1's
相關PDF資料 |
PDF描述 |
|---|---|
| TC7136A | Low Power 3-1/2 Digit Analog-to-Digital Converter |
| TC7136ACLW | Low Power 3-1/2 Digit Analog-to-Digital Converter |
| TC7136ACPI | Low Power 3-1/2 Digit Analog-to-Digital Converter |
| TC7136CLW | Low Power 3-1/2 Digit Analog-to-Digital Converter |
| TC7136CPI | Low Power 3-1/2 Digit Analog-to-Digital Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC7136A | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:LOW POWER, 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS |
| TC7136ACKW | 功能描述:LCD 驅動器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7136ACKW713 | 功能描述:LCD 驅動器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7136ACLW | 功能描述:LCD 驅動器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TC7136ACLW713 | 功能描述:LCD 驅動器 Low Power RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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