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| 型号： | TC7136ACLW |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, ACCESS, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 13/14页 |
| 文件大小： | 165K |
| 代理商： | TC7136ACLW |
8
TC7136
TC7136A
LOW POWER, 3-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTERS
Figure 4. Conversion Timing During Normal Operation
EXTENDED PERIODS.
The display font and segment drive assignment are
shown in Figure 6.
System Timing
Figure 5. Conversion Timing During Overrange Operation
between 0 and 2000 internal clock periods. The digital
reading displayed is
1000
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 60Hz 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 and V
–
IN are reversed, this indicator would reverse.
On the TC7136/A, when the TEST pin 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. LCDS MAY BE
DESTROYED IF OPERATED WITH DC LEVELS FOR
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
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)
(2) Signal integrate:
1000 counts
(4000 clock pulses)
This time period is fixed. The integration period is:
tSI = 4000
(
),
where fOSC 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 (CAZ)
The CAZ capacitor size has some influence on system
noise. A 0.47
F capacitor is recommended for 200mV full-
scale applications where 1 LSB is 100
V. A 0.1F capacitor
is adequate for 2V full-scale applications. A Mylar-type
dielectric capacitor is adequate.
Figure 6. Display FONT and Segment Assignment
1
fOSC
VIN
VREF
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
相关PDF资料 |
PDF描述 |
|---|---|
| TC7136CLW | 1-CH DUAL-SLOPE ADC, ACCESS, PQCC44 |
| TC7136ACKW | 1-CH DUAL-SLOPE ADC, ACCESS, PQFP44 |
| TC7136CKW | 1-CH DUAL-SLOPE ADC, ACCESS, PQFP44 |
| TC7136ACLW | 1-CH DUAL-SLOPE ADC, PQCC44 |
| TC7136ACPI | 1-CH DUAL-SLOPE ADC, PDIP40 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC7136ACLW713 | 功能描述:LCD 驱动器 Low Power RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7136ACPI | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low Power 3-1/2 Digit Analog-to-Digital Converter |
| TC7136ACPL | 功能描述:LCD 驱动器 Low Power RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7136ARCPL | 功能描述:LCD 驱动器 Low Power RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TC7136CKW | 功能描述:LCD 驱动器 Low Power RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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